FCC GROL Element 3 (Part 1 of 2)
3-11B5 What is the most the actual transmitter frequency could differ from a reading of 156,520,000 hertz on a frequency counter with a time base accuracy of +/- 10 ppm? A. 146.52 Hz B. 1565.20 Hz C. 10 Hz D. 156.52 kHz
Answer B: 1565.20 Hz 156.52 x 10 = 1565.2 Hz
3-7A5 What type of wave is made up of sine waves at the fundamental frequency and all the harmonics? A. Sawtooth wave B. Square wave C. sine wave D. Cosine wave
Answer A: Sawtooth wave
3-8A4 Which of the following groups is correct for listing common materials in order of descending conductivity? A. silver, copper, aluminum, iron, and lead B. Lead, iron, silver, aluminum, and copper C. Iron, silver, aluminum copper, and silver D. Silver, aluminum, iron, lead, and copper
Answer A: Silver, copper, aluminum, iron and lead
3-7A3 What type of wave is made up of sine waves of the fundamental frequency and all the odd harmonics? A. Square B. Sine C. Cosine D. Tangent
Answer A: Square
3-1A2 What is the basic unit of electrical power? A. ohm. B. Watt. C. Volt. D. Ampere.
Answer B. Watt.
3-13B6 What does the power factor equal in an R-L circuit having a 30 degree phase angle between the voltage and the current? A. 1.73 B. 0.866 C. 0.5 D. 0.577
Answer B: 0.866
3-14B6 After two time constants, the capacitor in an RC circuit is discharged to what percentage of the starting voltage? A. 86.5% B. 13.5% C. 63.2% D. 36.8%
Answer B: 13.5%
3-16B4 In rectangular coordinates, what is the impedance of a network composed of a 1.0-millihenry inductor in series with a 200-ohm resistor, at 30 kHz? A. 200 - j188 B. 200 + j188 C. 188 + j200 D. 188 - j200
Answer B: 200 + j188
3-12B5 What is the RMS value of a 340-volt peak-to-peak pure sine wave? A. 170 volts AC B. 240 volts AC C. 120 volts AC D. 350 volts AC
Answer C: 120 volts AC
3-17B2 In polar coordinates, what is the impedance of a network composed of a 100-ohm-reactance inductor in series with a 100-ohm resistor? A. 121 ohms, / 35 degrees B. 141 ohms, / 45 degrees C. 161 ohms, / 55 degrees D. 181 ohms, / 65 degrees
Answer B: 141 ohms, / 45 degrees
3-5A1 What are the two most commonly-used specifications for a junction diode? A. Maximum forward current and capacitance B. Maximum reverse current and PIV (peak inverse voltage) C. Maximum reverse current and capacitance D. Maximum forward current and PIV (peak inverse voltage)
D. Maximum forward current and PIV (peak inverse voltage)
3-40E6 In binary numbers, how would you note the quantity TWO? A. 0010 B. 0002 C. 2000 D. 0020
Answer A: 0010
3-36E4 How many bits of information can be stored in single flip-flop circuit? A. 1 B. 2 C. 3 D. 4
Answer A: 1
3-33E2 What is the voltage range considered to be a valid logic high input in a TTL device operating at 5.0 volts? A. 2.0 to 5.5 volts B. 1.5 to 3.0 volts C. 1.0 to 1.5 volts D. 5.2 to 34.8 volts
Answer A: 2.0 to 5.5 volts
3-27C3 What is the approximate operating current of a light -emitting diode? A. 20 mA B. 5 mA C. 10 mA D. 400 mA
Answer A: 20 mA
3-21C3 A transformer primary of 2250 turns connected to 120 VAC will develop what voltage across a 500-turn secondary? A. 26.7 volts B. 2300 volts C. 1500 volts D. 5.9 volts
Answer A: 26.7 volts
3-31D3 RF input to a mixer is 200 MHz and the local oscillator frequency is 150 MHz. What output would you expect to see at the IF output prior to any filtering? A. 50, 150, 200 and 350 MHz B. 50 MHz C. 350 MHz D. 50 and 350 MHz
Answer A: 50, 150, 200 and 350 MHz
3-18B4 What turns ratio does a transformer need in order to match a source impedance of 500 ohms to a load of 10 ohms? A. 7.1 to 1 B. 14.2 to 1 C 50 to 1 D. None of these
Answer A: 7.1 to 1
3-48F4 What is a frequency discriminator in a radio receiver? A. A circuit for detecting FM signals B. A circuit for filtering two closely adjacent signals C. An automatic band switching circuit D. An FM generator
Answer A: A circuit for detecting FM signals
3-37E3 What is a monostable multivibrator? A. A circuit that can be switched momentarily to the opposite binary state and then returns after a set time to its original state B. A "clock" circuit that produces a continuous square wave oscillating between 1 and 0 C. A circuit designed to store one bit of data in either the 0 or the 1 configuration D. A circuit that maintains a constant output voltage, regardless of variations in the input voltage
Answer A: A circuit that can be switched momentarily to the opposite binary state and then returns after a set time to its orginal state
3-31D1 What frequency synthesizer circuit uses a phase comparator, look-up table, digital-to-analog converter, and a low-pass antialias filter? A. A direct digital synthesizer B. Phase-locked-loop synthesizer C. A diode-switching matrix synthesizer D. A hybrid synthesizer
Answer A: A direct digital synthesizer
3-33E4 TTL inputs left open develop what logic state? A. A high-logic state B. A low-logic state C. Open inputs on a TTL device are ignored D. Random high- and low-logic states
Answer A: A high-logic state
3-35E5 Given the input levels shown in Figure 3E14 and assuming positive logic devices, what would the output be? A. A is low, B is high and C is high B. A is high, B is high and C is low C. A is low, B is low and C is high D. None of the above are correct
Answer A: A is low, B is high and C is high
3-35E6 What is a truth table? A. A list of input combinations and their corresponding outputs that characterizes a digital device's fuction B. A table of logic symbols that indicate the high logic states of an op-amp C. A diagram showing logic states when the digital device's output is true D. A table of logic symbols that indicates the low logic states of an op-amp
Answer A: A list of input combinations and their corresponding outputs that characterizes a digital device's function
3-49F1 What is the digital signal processing term for noise subtraction circuitry? A. Adaptive filtering and autocorrelation B. Noise blanking C. Noise limiting D. Automatic squelch noise reduction
Answer A: Adaptive filter and autocorrelation
3-19C4 What is the description of an optoisolator? A. An LED and a photosensitive device B. A P-N junction that develops an excess positive charge when exposed to light C. an LED and a capacitor D. An LED and a lithium battery cell
Answer A: An LED and a photosensitive device
3-23C2 What are the three terminals of an SCR? A. Anode, cathode, and gate B. Gate, source, and sink C. Base, collector, and emitter D. Gate, base , and base 2
Answer A: Anode, cathode, and gate
3-29D1 What is the approximate magnitude of the impedance of a parallel R-L-C circuit at resonance? A. Approximately equal to the circuit resistance B. Approximately equal to X (sub L) C. Low, as compared to the circuit resistance D. Approximately equal to X (sub C)
Answer A: Approximately equal to the circuit resistance
3-46F4 What parameter must be selected when designing an audio filter using an op-amp? A. Bandpass characteristics B. Desired current gain C. Temperature coefficient D. Output-offset overshoot
Answer A: Bandpass characteristics
3-25C4 What are the elements of a unijunction transistor? A. Base 1, base 2 and emitter B. Gate, cathode, and anode C. Gate, base 1, and base 2 D. Gate, source, and sink
Answer A: Base 1, base 2 and emitter
3-39E4 What portion of a microprocessor circuit is the pulse generator? A. Clock B. RAM C. ROM D. PLL
Answer A: Clock
3-43F4 Which type of oscillator circuit is commonly used in a VFO (variable frequency oscillator)? A. Colpitts B. Pierce C. Hartley D. Nagative feedback
Answer A: Colpitts
3-41F3 What is the term used to refer to a reduction in receiver sensitivity caused by unwanted high-level adjacent channel signals? A. Desensitizing B. Intermodulation distortion C. Quieting D. Overloading
Answer A: Desensitizing
3-45F4 A receiver selectivity of 10 kHz in the IF circuitry is optimum for what type of signals? A. Double-sideband AM B. SSB voice C. CW D. FSK RTTY
Answer A: Double-sideband AM
3-37E5 What is a bistable multivibrator circuit? A. Flip-flop B. AND gate C. OR gate D. Clock
Answer A: Flip-flop
3-30D6 In the op-amp oscillator circuit shown in Figure 3D6, what would be the most noticeable effect if the capacitance of C were suddenly doubled? A. Frequency would be lower B. Frequency would be higher C. There would be no change. The inputs are reversed, therefore the circuit cannot fuction D. None of the above
Answer A: Frequency would be lower
3-35E4 In a positive-logic circuit, what level is used to represent logic 1? A. High level B. Low level C. Positive-transition level D. Negative-transition level
Answer A: High level
3-32D2 Which lamps would be lit in the circuit shown in Figure 3D8? A. 2, 3, 4, 5 and 6 B. 5, 6, 8 and 9 C. 2, 3, 4, 7 and 8 D. 1, 3, 5, 7 and 8
Answer C: 2, 3, 4, 7 and 8
3-47F3 What are the three general troupins of filters? A. High-pass, low-pass and band-pass B. Inductive, capacitive and resistive C. Audio, radio and capacitive D. Hartley, Colpitts and Pierce
Answer A: High-pass, low-pass and band-pass
3-21C1 A capacitor is sometimes placed in series with the primary of a power transformer to: A. Improve the power factor B. Improve output voltage regulation C. Rectify the primary windings D. None of these
Answer A: Improve the power factor
3-50F6 Pulse type interference to automobile radio receivers that appears related to the speed of the engine can often be reduced by: A. Installing resistances in series with spark plugs wires B. Using heavy conductors between the starting battery and the starting motor C. Connecting resistances in series with the battery D. Grounding the negative side of the battery
Answer A: Installing resistances in series with spark plugs wires
3-20C6 What is the purpose of a coupling capacitor? A. It blocks direct current and passes alternating current B. It blocks alternating current an passed direct current C. It increases the resonant frequency of the crcuit D. It decreases the resonant frequency of the circuit
Answer A: It blocks direct current and passes alternating current
3-47F5 What is an advantage of a constant-k filter? A. It has high attenuation of signals at frequenices far removed from the pass band B. It can match impedances over a wide range of frequenices C. It uses elliptic functions D. The ratio of the cut-off frequency to the trap frequency can be varied
Answer A: It has high attentuation of signals at frequencies far removed from the pass band
3-19C1 What happens to the conductivity of photoconductive material when light shines on it? A. It increases B. It decreases C. It stays the same D. It becomes temperature dependent
Answer A: It increases
3-24C3 Structurally, what are the two main categories of semiconductor diodes? A. Junction and point contact B. Electrolytic and junction C. Electrolytic and point contact D. Vacuum and point contact
Answer A: Junction and point contact
3-29D4 What is the characteristic of the current flow in a series R-L-C circuit at resonance? A. Maximum B. Minimum C. DC D. Zero
Answer A: Maximum
3-28C4 What is the piezoelectirc effect? A. Mechanical vibration of a crystal by the application of a voltage B. Mechanical deformation of a crystal by the application of a magnetic field C. The generation of electrical energy by the application of light D. Reversed conduction states when a P-N junction is exposed to light
Answer A: Mechanical vibration of a crystal by the application of a voltage
3-32D3 What will occur if an amplifier input signal coupling capacitor fails open? A. No amplification will occur, with DC within the circuit measuring normal B. Improper biasing will occur within the amplifier stage C. Oscillation and thermal runaway may occur D. An AC hum will appear on the circuit output
Answer A: No amplification will occur, with DC within the circuit measuring normal
3-27C5 An LED facing a photodiode in a light-tight enclosure is commonly known as a/an: A. Optoisolator B. Seven segment LED C. Optointerrupter D. Infra-red (IR) detector
Answer A: Optoisolator
3-49F4 What causes a squelch circuit to function? A. Presence of noise B. Absence of noise C. Received tones D. Received digital codes
Answer A: Presence of noise
3-34E3 What is a characteristic of an OR gate? A. Produces a logic "1" at its output if any input is logic "1" B. Produces a logic "0" at its output if any input is logic "1" C. Produces a logic "0" at its output if all inputs are logic "1" D. Produces a logic "1" at its output if all inputs are relogic "0"
Answer A: Produces a logic "1" at its output if any input is logic "1"
3-38E4 What is the name for a microprocessor's sequence of commands and instructions? A. Program B. Sequence C. Data string D. Data execution
Answer A: Program
3-45F6 How should the filter bandwidth of a receiver IF section compare with the bandwidth of a received signal? A. Slightly greater than the received-signal bandwidth B. Approximately half the received-signal bandwidth C. Approximately two times the received-signal bandwidth D. Approximately four times the received-signal bandwidth
Answer A: Slightly greater than the received-signal bandwidth
3-42F3 How much gain should be used in the RF amplifier stage of a receiver? A. Sufficient gain to allow weak signals to overcome noise generated in the first mixer stage B. As much gain as possible short of self oscillation C. Sufficient gain to keep weak signals below the noise of the first mixer stage D. It depends on the amplification factor of the first IF stage
Answer A: Sufficient gain to allow weak signals to overcome noise generated in the first mixer stage
3-26C4 What conditions exists when a transistor is operating in saturation? A. The base-emitter junction and collector-base junction are both forward biased B. The base-emitter junction and collector-base junction are both reverse biased C. The base-emitter junction is reverse biased and the collector-base junction is forward biased D. The base-emitter junction is forward biased and the collector-base junction is reverse biased
Answer A: The base-emitter junction and collector-base junction are both forward biased
3-25C6 What does it mean for a transistor to be fully saturated? A. The collector current is at its maximum value B. The collector current is at its minimum value C. The transistor's Alpha is at its maximum value D. The transistor's Beta is at its maximum value
Answer A: The collector current is at its maximum value
3-41F1 What is the limiting condition for sensitivity in a communications receiver? A. The noise floor of the receiver B. The power supply output ripple C. The two-tone intermodulation distortion D. The input impedance to the detector
Answer A: The noise floor of the receiver
3-43F2 What is the oscillator stage called in a frequency synthesizer? A. VCO B. Divider C. Phase detector D. Reference standard
Answer A: VCO
3-39E1 In a microprocessor-controlled two-way radio, a "watchdog" timer: A. Verifies that the microprocessor is executing the program B. Assures that the transmission is exactly on frequency C. Prevents the transmitter from exceeding allowed power out D. Connects to the system RADAR presentation
Answer A: Verifies that the microprocessor is executing the program
3-22C3 What device is usually used as a stable reference voltage in a linear voltage regulator? A. Zener diode B. Tunnel diode C. SCR D. Varactor diode
Answer A: Zener diode
3-18B6 What is the conductance (G) of a circuit if 6 amperes of current flows when 12 volts DC is applied? A. 0.25 Siemens (mhos) B. 0.50 Siemens (mhos) C. 1.00 Siemens (mhos) D. 1.25 Siemens (mhos)
Answer B: 0.50 Siemens (mhos)
3-44F1 What is the image frequency info the normal channel is 151.000 MHz, the IF is operating at 11.000 MHz, and the LO is at 140.000MHz? A. 131.000 MHz B. 129.000 MHz C. 162.000 MHz D. 150.000 MHz
Answer B: 129.000 MHz
3-20C3 In figure 3C4, which component (labeled 1 through 4) is used to provide a signal ground? A. 1 B. 2 C. 3 D. 4
Answer B: 2
3-32D6 With a pure AC signal input to the circuit shown in Figure 3D11, what output wave form would you expect to see on an oscilloscope display? A. 1 B. 2 C. 3 D. 4
Answer B: 2
3-36E1 A flip-flop circuit is a binary logic element with how many stable states? A. 1 B. 2 C. 4 D. 8
Answer B: 2
3-43F6 In Figure 3F15, which block diagram symbol (labeled 1 through 4) is used to represent a local oscillator? A. 1 B. 2 C. 3 D. 4
Answer B: 2
3-47F1 A good Crystal band-pass filter for a single-sideband phone would be? A. 5 KHz B. 2.1 KHz C. 500 Hz D. 15 KHz
Answer B: 2.1 KHz
3-22C6 What is the range of voltage ratings available in Zener diodes? A. 1.2 volts to 7 volts B. 2.4 volts to 200 volts and above C. 3 volts o 2000 volts D. 1.2 volts to 5.6 volts
Answer B: 2.4 volts to 200 volts and above
3-18B2 A 1-watt, 10-volt Zener diode with the following characteristics: I(sub min). = 5 mA; I (sub max). = 95 mA; and Z = 8 ohms, is to be used as part of a voltage regulator in a 20-V power supply. Approximately what size current-limiting resistor would be used to set its bias to the midpoint of its operating range? A. 100 ohms B. 200 ohms C. 1 kilohms D. 2 kilohms
Answer B: 200 ohms
3-35E2 For the logic input levels shown in Figure 3E12, what are the logic levels of test points A, B and C in this circuit? (Assume positive logic.) A. A is high, B is low and C is low B. A is low, B is high and C is high C. A is high, B is high and C is low D. A is low, B is high and C is low
Answer B: A is low, B is high and C is high
3-23C6 What circuit might contain a SCR? A. Filament circuit of a tube radio receiver B. A light-dimming circuit C. Shunt across a transformer primary D. Bypass capacitor circuit to ground
Answer B: A light-dimming circuit
3-41F2 What is the definition of the term "receiver desensitizing"? A. A burst of noise when the squelch is set too low B. A reduction in receiver sensitivity because of a strong signal on a nearby frequency C. A burst of noise when the squelch is set too high D. A reduction in receiver sensitivity when the AF gain control is turned down
Answer B: A reduction in receiver sensitivity because of a strong signal on a nearby frequency
3-44F5 If a receiver mixes a 13.8 MHz VFO with a 14.255 MHz receive signal to produce a 455 kHz intermediate frequency signal, what type of interference will a 13.345 MHz signal produce in the receiver? A. Local oscillator interference B. An image response C. Mixer interference D. Intermediate frequency interference
Answer B: An image response
3-29D2 What is the approximate magnitude of the impedance of the series circuit at resonance? A. High, as compared to the circuit resistance B. Approximately equal to the circuit resistance C. Approximately equal to X (sub L) D. Approximately equal to X (sub C)
Answer B: Approximately equal to the circuit resistance
3-39E5 In a microprocessor, what is the meaning of the term "ALU"? A. Automatic lock/unlock B. Arithmetical logic unitl C. Automatic latch undo D. Answer local unit
Answer B: Arithmetical logic unit
3-25C2 What are the three terminals of a bipolar transistor? A. Cathode, plate and grid B. Base, collector and emitter C. Gate, source and sink D. Input, output and ground
Answer B: Base, collector and emitter
3-37E1 The frequency of an AC signal can be divided electronically by what type of digital circuit? A. Free-running multivibrator B. Bistable multivibrator C. OR gate D. Astable multivibrator
Answer B: Bistable mulitvibrator
3-50F3 What is the term used to refer to the condition where the signals from a very strong station are superimposed on other signlas being received? A. Intermodulation distortion B. Cross-modulation interference C. Receiver quieting D. Capture effect
Answer B: Cross-modulation interference
3-38E6 What is the name of the Random-Accessed semiconductor memory IC that must be refreshed periodically to maintain reliable data storage in its memory matrix? A. ROM - Read-Only Memory B. DRAM - Dynamic Random-Access Memory C. PROM - Programmable Read-Only Memory D. PRAM - Programmable Random-Access Memory
Answer B: DRAM - Dynamic Random-Access Memory
3-39E2 What does the term "DAC" refer to in a microprocessor circuit? A. Dynamic access controller B. Digital to analog converter C. Digital access counter D. Dial analog control
Answer B: Digital to analog converter
3-25C5 The beta cutoff frequency of a bipolar transistor is the frequency at which: A. Base current gain has increased to 0.707 of maximum B. Emitter current gain has decreased to 0.707 of maximum C. Collector current gain has decreased to 0.707 D. Gate current gain has decreased to 0.707
Answer B: Emitter current gain has decreased to 0.707 of maximum
3-27C1 What type of bias is required for an LED to produce luminescence? A. Reverse bias B. Foward bias C. Logic 0 (Lo) bias D. Logic 1 (Hi) bias
Answer B: Forward bias
3-48F2 Which circuit is used to detect FM-phone signals? A. Balanced modulator B. Frequency discriminator C. Product detector D. Phase splitter
Answer B: Frequency discriminator
3-42F6 In what stage of a VHF receiver would a low noise amplifier be most advantageous? A. IF stage B. Front end RF stage C. Audio stage D. Power supply
Answer B: Front end RF stage
3-46F1 What is the primary purpose of the final IF amplifier stage in a receiver? A. Dynamic response B. Gain C. Noise figure performance D. Bypass Undesired signals
Answer B: Gain
3-29D5 What is the characteristic of the current flow within the parallel elements in a parallel R-L-C circuit at resonance? A. Minimum B. Maximum C. DC D. Zero
Answer B: Maximum
3-21C2 A transformer used to step up its input voltage must have: A. More turns of wire on its primary than on its secondary B. More turns of wire on its secondary than on its primary C. Equal number of primary and secondary turns of wire D. None of the above statements are correct
Answer B: More turns of wire on its secondary than on its primary
3-26C1 A common base amplifier has: A. More current gain than common emitter or common collector B. More voltage gain than common emitter or common collector C. More power gain than common emitter or common collector D. Highest input impedance of the three amplifier configurations
Answer B: More voltage gain than common emitter or common collector
3-31D2 A circuit that compares the output of a voltage-controlled oscillator (VCO) to a frequency standard and produces an error voltage that is then used to adjust the capacitance of a varactor diode used to control frequency in that same VCO is call what? A. Doubly balanced mixer B. PHase-locked loop C. Differential voltage amplifier D. Variable frequency oscillator
Answer B: Phase-locked loop
3-28C6 In which oscillator circuit would you find a quartz crystal? A. Hartley B. Pierce C. Colpitts D. All of the above
Answer B: Pierce
3-34E5 What is a characteristic of a NOT gate? A. Does not allow data transmission when it's input is high B. Produces a logic "0" at its output when the input is logic "1" and vice versa C. Allows data trasmission only when it's input is high D. Produces a logic "1" at its output when the input is logic "1" and vice versa
Answer B: Produces a logic "0" at its output when the input is logic "1" and vice versa
3-34E1 What is a characteristic of an AND gate? A. Produces a logic "0" at its output only if all inputs are logic "1" B. Produces a logic "1" at its output only if all inputs are logic "1" C. Produces a logic "1" at its output if only one input is a logic "1" D. Produces a logic "1" at its output if all inputs are a logic "0"
Answer B: Produces a logic "1" at its output only if all inputs are a logic "1"
3-40E3 What is the function of a decade counter digital IC? A. Decode a decimal number for display on a seven-segment LED display B. Produces one output pulse for every ten input pulses C. Produces ten output pulses for every input pulse D. Add two decimal numbers
Answer B: Produces one output pulse for every ten input pulses
3-24C1 What is one common use for PIN diodes? A. Constant current source B. RF switch C. Constant voltage source D. RF rectifier
Answer B: RF switch
3-38E2 What is the name of the semiconductor IC that has a fixed pattern of digital data stored in its memory matrix? A. RAM - Random-Access Memory B. ROM - Read-Only Memory C. Register D. Latch
Answer B: ROM - Read-Only Memory
3-45F2 Which one of these filters can be used in micro-miniature electronic circuits? A. High power transmitter cavity B. Receiver SAW IF filter C. Floppy disk controller D. Internet DSL to telephone line filter
Answer B: Receiver SAW IF filter
3-31D5 In a direct digital synthesizer, what are the unwanted components on its output? A. Boradband noise B. Spurs at discrete frequencies C. Digital conversion noise D. Nyquist limit noise pulses
Answer B: Spurs at discrete frequencies
3-21C5 A power transformer has a single primary winding and three secondary windings producing 5.0 volts, 12.6 vols, and 150 volts. Assuming similar wire sizes, which of the three secondary windings will have the highest measured DC resistance? A. The 12.6 volt winding B. The 150 volts winding C. The 5.0 volt winding D. All will have equal resistance values
Answer B: The 150 volts winding
3-19C2 What is the photoconductive effect? A. the conversion of photon energy to electromotive energy B. The increased conductivity of an illuminated semiconductor junction C. the conversion of electromotive energy to photon energy D. The decreased conductivity of an illuminated semiconductor junction
Answer B: The increased conductivity of an illuminated semiconductor junction
3-19C5 What happens to the conductivity of a photosensitive semiconductor junction when it is illuminated? A. The junction resistance is unchanged B. the junction resistance decreases C. The junction resistance becomes temperature dependent D. The juntion resistance increases
Answer B: The junction resistance decreases
3-30D3 Gain of a closed-loop op-amp circuit is determined by? A. the maximum operating frequency divided by the square root of the load impedance B. The op-amp's external feedback network C. Supply voltage and slew rate D. The op-amp's internal feedback network
Answer B: The op-amp's external feedback network
3-48F6 What is the definition of detection in a radio receiver? A. The process of making out the intelligence on a received carrier to make an S-meter operational B. The recovery of intelligence form the modulated RF signal C. The modulation of a carrier D. The mixing of noise with the received signal
Answer B: The recovery of intelligence from the modulated RF signal
3-28C2 Why are special precautions necessary in handling FET and CMOS devices? A. They have fragile leads that may break off B. They are susceptible to damage from static charges C. They have micro-welded semiconductor junctions that are susceptible to breakage D. they are light sensitive
Answer B: They are susceptible to damage from static charges
3-49F5 What makes a CTCSS squelch work? A. Noise B. Tones C. Absence of noise D. Digital codes
Answer B: Tones
3-33E6 What do the initials TTL stand for? A. Resistor-transistor logic B. Transistor-transistor logic C. Diode-transistor logic D. Emitter-coupled logic
Answer B: Transistor-transistor logic
3-45F5 Want is an undesirable effect of using too wide a filter bandwidth in the IF section of a receiver? A. Output-offset overshoot B. Undesired signals will reach the audio stage C. Thermal-noise distortion D. Filter ringing
Answer B: Undesired signals will reach the audio stage
3-24C5 What type of semiconductor diode varies its internal capacitance as the voltage applied to its terminal varies? A. Tunnel diode B. Varactor diode C. Silicon-controlled rectifier D. Zener diode
Answer B: Varactor diode
3-49F2 What is the purpose of de-emphasis in the receiver audio stage? A. When copuled with the transmitter pre-emphasis, flat audio is achieved B. When coupled with the transmitter pre-emphasis, flat audio and noise reduction is received C. No purpose is achieved D. To conserve bandwidth by squelching no-audio periods in the transmission
Answer B: When coupled with the transmitter pre-emphasis, flat audio and noise reduction is received
3-18B1 What is the magnitude of the impedance of a series AC circuit having a resistance of 6 ohms, an inductive reactance of 17 ohms, and a zero capacitive reactance? A. 6.6 ohms B. 11 ohms C. 18 ohms D. 23 ohms
Answer C: 18 ohms
3-36E2 What is a flip-flop circuit? A binary sequential logic lement with ___ stable states. A. 1 B. 4 C. 2 D. 8
Answer C: 2
3-18B3 Given a power supply with a no load voltage of 12 volts and a full load voltage of 10 volts, what is the percentage of voltage regulation? A. 17% B. 80% C. 20% D. 83%
Answer C: 20%
3-21C4 What is the ratio of the output frequency to the input frequency of a single-phase full-wave rectifier? A. 1:1 B. 1:2 C. 2:1 D. None of these
Answer C: 2:1
3-20C4 In Figure 3C5, which capacitor (labeled 1 through 4) is being used as a bypass capacitor? A. 1 B. 2 C. 3 D. 4
Answer C: 3
3-32D5 In Figure 3D10 with a square wave input what would be the output? A. 1 B. 2 C. 3 D. 4
Answer C: 3
3-36E5 How many R-S flip-flops would be required to construct an 8 bit storage register? A. 2 B. 4 C. 8 D. 16
Answer C: 8
3-35E3 For the logic input levels given in Figure 3E13, what are the logic levels of test oints A, B and C in this circuit? (Assume positive logic.) A. A is low, B is low and C is high B. A is low, B is high and C is low C. A is high, B is high and C is high D. A is high, B is low and C is low
Answer C: A is high, B is high and C is high
3-40E4 What integrated circuit device converts an analog signal to a digital signal? A. DAC B. DCC C. ADC D. CDC
Answer C: ADC
3-34E6 Which of the following logic Gates will provide an active high out when both inputs are active high? A. NAND B. NOR C. AND D. XOR
Answer C: AND
3-19C6 what is the description of an optocoupler? A. A resistor and a capacitor B. Two light sources modulated onto a mirrored surface C. An LED and a photosensitive device D. An amplitude modulated beam encoder
Answer C: An LED and a photosensitive device
3-26C5 For current to flow in an NPN silicon transistor's emitter-collector junction, the base must be: A. At least 0.4 volts positive with respect to the emitter B. At a negative voltage with respect to the emitter C. At least 0.7 volts positive with respect to the emitter D. At least 0.7 volts negative with respect to the emitter
Answer C: At least 0.7 volts positive with respect to the emitter
3-40E2 What does the term 'BCD" mean? A. Binaural coded digit B. Bit count decimal C. Binary coded decimal D. Broad course digit
Answer C: Binary coded decimal
3-31D4 What spectral impurity components might be generated by a phase-locked-loop synthesizer? A. Spurs at discrete frequencies B. Random Spurs which gradually drift up in frequency C. Broadband noise D. Digitial conversion noise
Answer C: Broadband noise
3-25C3 What is the meaning of the therm "beta" with regard to bipolar transistors? The change of: A. Base current with respect to emitter current B. Collector current with respect to emitter current C. Collector current with respect to base current D. Base current with respect to gate current
Answer C: Collector current with respect to base current
3-28C3 What do the initials CMOS stand for? A. Common mode oscillating system B. Complementary mica-oxide silicon C. Complementary metal-oxide semiconductor D. Complementary metal=oxide substrate
Answer C: Complementary metal-oxide semiconductor
3-22C5 A three-terminal regulator: A. Supplies three voltages with variable current B. Supplies three voltages at a constant current C. contains a voltage reference, error amplifier, sensing resistors and transistors, and a pass element D. Contains three error amplifiers and sensing trasistors
Answer C: Contains a voltage reference, error amplifier, sensing resistors and transistors, and a pass element
3-39E6 What circuit interconnects the microprocessor with the memory and input/output system? A. Control logic bus B. PLL line C. Data bus line D. Directional coupler
Answer C: Data bus line
3-20C2 In Figure 3C4, if a small variable capacitor were installed in place of the dashed line, it would? A. Increase gain B. Increase parasitic oscillations C. Decrease parasitic oscillations D. Decrease crosstalk
Answer C: Decrease parasitic oscillations
3-30D4 Where is the external feedback network connected to control the gain of a closed-loop op-amp circuit? A. Between the differential inputs B. From output to the non-inverting input C. From output to the inverting input D. Between the output and the differential inputs
Answer C: From output to the inverting input
3-42F5 What is the advantage of a GaAsFET peramplifier in modern VHF radio receiver? A. Increased selectivity and flat gain B. Low gain but high selectivity C. High gain and low noise floor D. High gain with high noise floor
Answer C: High gain and low noise floor
3-46F2 What factors should be considered when selecting an intermediate frequency? A. Cross-modulation distortion and interference B. Interference to other services C. Image rejection and selectivity D. Noise figure and distortion
Answer C: Image rejection and selectivity
3-23C1 How might two similar SCRs be connected to safely distribute the power load of a circuit? A. In series B. In parallel, same polarity C. In parallel, reverse polarity D. In a combination series and parallel configuration
Answer C: In parallel, reverse ploarity
3-38E3 What does the term "IO" mean within a microprocessor system? A. Integrated oscillator B. Integer operation C. Input-output D. Internal operation
Answer C: Input-output
3-50F2 How can ferrite beads be used to suppress ignition noise? Install them: A. In the resistive high voltage cable every 2 years B. Between the starter solenoid and the starter motor C. Install them in the primary and secondary ignition leads D. In the antenna lead
Answer C: Install them in the primary and secondary ignition leads
3-46F5 What are the distinguishing features of a Chebyshev filter? A. It has a maximally flat response over its passband B. It only requires inductors C. It allows ripple in the passband D. A filter whose product of the series- and shunt-element impedances is a constant for all frequencies
Answer C: It allows ripple in the passband
3-47F6 What are the distinguishing features of a Butterworth filter? A. A filter whose product of the series- and shunt-element impedances is a constant for all frequencies B. It only requires capacitors C. It has a maximally flat response over its passband D. It requires only inductors
Answer C: It has a maximally flat response over its passband
3-30D2 What are the characteristics of an inverting operational amplifier (op-amp) circuit? A. It has input and output signals in phase B. Input and output signals are 90 degrees out of phase C. It has input and output signals 180 degrees out of phase D. Input impedance is low while the output impedance is high
Answer C: It has input and output signals 180 degrees out of phase
3-28C1 What describes a diode junction that is forward biased? A. It is a high impedance B. It conducts very little current C. It is a low impedance D. It is an open circuit
Answer C: It is a low impedance
3-43F1 Why is the Colpitts oscillator circuit commonly used in a VFO (variable frequency oscillator)? A. It can be phase locked B. It can be remotely tuned C. It is stable D. It has little or no effect on the crystal's stability
Answer C: It is stable
3-48F1 What is a product detector? A. It proves local oscillations for input to the mixer B. It amplifier and narrows the band-pass frequencies C. It uses a mixing process with a locally generated carrier D. It is used to detect cross-modulation products
Answer C: It uses a mixing process with a locally generated carrier
3-50F4 What is the cross-modulation interference? A. Interference between two transmitters of different modulation type B. Interference caused by audio rectification in the receiver preamp C. Modulation from an unwanted signla heard in addition to the desired signal D. Harmonic distortion of the transmitter signal
Answer C: Modulation from an unwanted signal heard in addition to the desired signal
3-24C6 What is the principal characteristic of a tunnel diode? A. High forward resistance B. Very high PIV (peak inverse voltage) C. Negative resistance region D. High foward current rating
Answer C: Negative resistance region
3-34E4 What is a characteristic of a NOR gate? A. Produces a logic "0" at this output only if all inputs are logic "0" B. Produces a logic "1" at its output only if all inputs are logic "1" C. Produces a logic "0" at its outupt if any or all inputs are logic "1" D. Produces a logic "1" at its output if some but not all of its inputs are logic "1"
Answer C: Produces a logic "0" at its output if any or all inputs are logic "1"
3-38E1 What is the name of the semiconductor memory IC whose digital data can be written or read, and whose memory word address can be accessed randomly? A. ROM - Read-Only Memory B. PROM - Programmable Read-Only Memory C. RAM Random-Access Memory D. EPROM - Electrically Programmable Read-Only Memory
Answer C: RAM - Random-Access Memory
3-48F3 What is the process of detection in a radio diode detector circuit? A. Breakdown of the Zener voltage B. Mixing with noise in the transition region of the diode C. Rectification and filter of RF D. The change of reactance in the diode with respect to frequency
Answer C: Rectification and filter of RF
3-45F3 A receiver selectivity of 2.4 kHz in the IF circuitry is optimum for what type of signals? A. CW B. Double-sideband AM voice C. SSB voice D. FSK RTTY
Answer C: SSB voice
3-27C6 What circuit component must be connected in series to protect an LED? A. Bypass capacitor to ground B. Electrolytic capacitor C. Series resistor D. Shunt coil in series
Answer C: Series resistor
3-44F6 What might occur in a receiver if excessive amounts of signal energy overdrive the mixer circuit? A. Automatic limiting occurs B. Mixer blanking occurs C. Spurious mixer products are generaged D. The mixer circuit becomes unstable and drifts
Answer C: Spurious mixer products are generated
3-37E6 What wave form would appear on the voltage outputs at the collectors of an astable, multivibrator, common-emitter stage? A. Sine wave B. Sawtooth wave C. Square wave D. Half-wave pulses
Answer C: Square wave
3-22C2 A switching electronic voltage regulator: A. Varies the conduction of a control element in direct proportion to the line voltage or load current B. Provides more than one output voltage C. Switches the control device on or off, with the duty cycle proportional to the line or load conditions D. Gives a ramp voltage at its output
Answer C: Switches the control device on or off, with the duty cycle proportional to the line or load conditions
3-41F4 What is meant by the term noise figure of a communications receiver? A. The level of noise entering the receiver from the antenna B. The relative strength of a received signal 3 kHz removed from the carrier frequency C. The level of noise generated in the front end and succeeding stages of a receiver D. The ability of a receiver to reject unwanted signals at frequencies close to the desired one
Answer C: The level of noise generated in the front end and succeeding stages of a receiver
3-44F4 What are the principal frequencies that appear at the output of a mixer circuit? A. Two and four times the original frequency B. The sum, difference and square root of the input frequencies C. the original frequencies and the sum and difference frequencies D. 1.414 and 0.707 times the input frequency
Answer C: The original frequenices and the sum and difference frequencies
3-29D6 What is the relationship between current through a resonant circuit and the voltage across the circuit? A. The current and voltage are 180 degrees out of phase B. The current leads the voltage by 90 degrees C. The voltage and current are in phase D. The voltage leads the current by 90 degrees
Answer C: The voltage and current are in phase
3-26C2 What does it mean for a transistor to be cut off? A. There is no base current B. the transistor is at its Class A operating point C. There is no current between emitter and collector D. There is maximum current between emitter and collector
Answer C: There is no current between emitter and collector
3-42F2 What is the primary purpose of an RF amplifier in a receiver? A. To provide most of the receiver gain B. To vary the receiver image rejection by utilizing the AGC C. To improve the receiver's noise figure D. To develop the AGC voltage
Answer C: To improve the receiver's noise figure
3-24C4 What special type of diode is capable of both amplification and oscillation? A. Zener diodes B. Point contact diodes C. Tunnel diodes D. Junction diodes
Answer C: Tunnel diodes
3-33E1 What is the voltage range considered to be valid logic low input in a TTL device operating at 5 volts? A. 2.0 to 5.5 volts B. -2.0 to -5.5 volts C. Zero to 0.8 volts D. 5.2 to 34.8 volts
Answer C: Zero to 0.8 volts
3-49F6 What radio circuit samples analog signals, records and processes them as numbers, then converts them back to analog signals? A. The pre-emphasis audio stage B. The squelch gate circuit C. The digitial signal processing circuit D. The voltage controlled oscillator circuit
Answer C: the digital signal processing circuit
3-26C6 When an NPN transistor is operating as a Class A amplifier, the base-emitter junction: A. And collector-base junction are both forward biased B. And collector-base junction are both reverse biased C. Is reverse biased and the collector-base junction is forward biased D. Is forward biased and the collector-base junction is reverse biased
Answer D. Is forward biased and the collector-base junction is reverse biased
3-26C3 An emitter-follower amplifier has: A. More voltage gain than common emitter or common base B. More power gain than common emitter or common base C. Lowest input impedance of the three amplifier configurations D. More current gain than common emitter or common base
Answer D. More current gain than common emitter or common base
3-12B1 At pi/3 radians, what is the amplitude of a sine-wave having a peak value of 5 volts? A. -4.3 volts B. -2.5 volts C. +2.5 volts D. +4.3 volts
Answer D: +4.3 volts
3-32D1 Given the combined DC input voltages, what would the output voltage be in the circuit shown in Figure 3D7? A. 150 mV B. 5.5 V C. -15 mv D. -5.5 V
Answer D: -5.5 V
3-45F1 What degree of selectivity is desirable in the IF circuitry of a wideband FM phone receiver? A. 1kHz B. 2.4 kHz C. 4.2 kHz D. 15 kHz
Answer D: 15 kHz
3-36E3 How many flip-flops are required to divide a signal frequency by 4? A. 1 B. 4 C. 8 D. 2
Answer D: 2
3-27C4 What would be the maximum current to safely illuminate a LED? A. 1 amp B. 1 microamp C. 500 milliamps D. 20 mA
Answer D: 20 mA
3-18B5 Given a power supply with a full load voltage of 200 volts and a regulation of 25%, what is the no load voltage? A. 150 volts B. 160 volts C. 240 volts D. 250 volts
Answer D: 250 volts
3-50F5 In Figure 3F15 at what point in the circuit (labeled 1 through 4) could a DC voltmeter be used to monitor signal strength? A. 1 B. 2 C. 3 D. 4
Answer D: 4
3-33E3 What is the common power supply voltage for TTL series integrated circuits? A. 12 volts B. 13.6 volts C. 1 volts D. 5 volts
Answer D: 5 volts
3-21C6 A power transformer has a primary winding of 200 turns of #24 wire and a secondary winding consisting of 500 turns of the same size wire. When 20 volts are applied to the primary winding, the expected secondary voltage will be: A. 500 volts B. 25 volts C. 10 volts D. 50 volts
Answer D: 50 volts
3-38E5 How many individual memory cells would be contained in a memory IC that has 4 data bus input/output pins and 4 address pins for connection to the address bus? A. 8 B. 16 C. 32 D. 64
Answer D: 64
3-50F1 Where would you normally find a low-pass filter in a radio receiver? A. In the AVC circuit B. In the Oscillator stage C. In the Power Supply D. A and C, but not B
Answer D: A and C, but not B
3-37E2 What is an astable multivibrator? A. A circuit that alternates between two stable states B. A circuit that alternates between a stable state and an unstable state C. A circuit set to block either a 0 pulse or a 1 pulse and pass the other D. A circuit that alternates between two unstable states
Answer D: A circuit that alternates between two unstable states
3-47F4 What is an m-derived filter? A. A filter whose input impedance varies widely over the design bandwidth B. A filter whose product of the series- and shunt-element impedances is a constant for all frequencies C. A filter whose schematic shape is the letter "M" D. A filter that uses a trap to attenuate undesired frequencies too near cut-off for a constant-k filter
Answer D: A filter that uses a trap to attenuate Undesired frequencies too near cut-off for a constant-k filter
3-47F2 Which statement is true regarding the filter output characteristics shown in Figure 3F16? A. C is a low pass curve and B is a band pass curve B. B is a high pass curve and D is a low pass curve C. A is a high pass curve and B is a low pass curve D. A is a low pass curve and D is a band stop curve
Answer D: A is a low pass curve and D is a band stop curve
3-31D6 What is the definition of a phase-locked-loop (PLL) circuit? A. A servo loop consisting of a ratio detector, reactance modulator, and a voltage-controlled oscillator B. A circuit also known as a monostable multivibrator C. A circuit consisting of a precision push-pull amplifier with a differential input D. A servo loop consisting of a phase detector, a low-pass filter and voltage-controlled oscillator
Answer D: A servo loop consisting of a phase detector, a low-pass filter and voltage-controlled oscillator
3-20C5 In figure 3C5, the 1 micro-farad capacitor is connected to a potentiometer that is used to: A. Increase gain B. Neutralize amplifier C. Couple D. Adjust tone
Answer D: Adjust tone
3-42F1 How can selectivity be achieved in the front-end circuitry of a communcations receiver? A. By using an audio filter B. By using an additional RF amplifier stage C. By using an additional IF amplifier stage D. By using a preselector
Answer D: By using a preselector
3-25C1 What is the meaning of the term "alpha" with regard to bipolar transistors? The change of: A. Collector current with respect to base current B. Base current with respect to collector current C. Collector current with respect to gate current D. Collector current with respect to emitter current
Answer D: Collector current with respect to emitter current
3-43F3 What are three major oscillator circuits found in radio equipment? A. Taft, Pierce and negative feedback B. Colpitts, Hartley and Taft C. Taft, Hartley and Pierce D. Colpitts, Hartley and Pierce
Answer D: Colpitts, Hartley and Pierce
3-30D5 Which of the following op-amp circuits is operated ope-loop? A. Non-inverting amp B. Inverting amp C. Active filter D. Comparator
Answer D: Comparator
3-40E5 What integrated circuit device converts digital signals to analog signals? A. ADC B. DCC C. CDC D. DAC
Answer D: DAC
3-49F3 What makes a Digital Coded Squelch work? A. Noise B. Tones C. Absence of noise D. Digital codes
Answer D: Digital codes
3-48F5 In a CTCSS controlled FM receiver, the CTCSS tone is filtered out after the: A. IF stage but before the mixer B. Mixer but before the IF C. IF but before the discriminator D. Discriminator but before the audio section
Answer D: Discriminator but before the audio section
3-20C1 What factors determine the capacitance of a capacitor? A. Voltage on the plates and distance between the plates B. Voltage on the plates and the dielectric constant of the material between the plates C. Amount of charge on the plates and the dielectric constant of the material between the plates D. Distance between the plates and the dielectric constant of the material between the plates
Answer D: Distance between the plates and the dielectric constant of the material between the plates
3-40E1 What is the purpose of the prescaler circuit? A. Converts the output of a JK flip-flop to that of an R-S flip-flop B. Multiplies an HF signal so a low-frequency counter can display the operating frequency C. Prevents oscillation in a low frequency counter circuit D. Divides an HF signal so that a low-frequency counter can display the operating frequency
Answer D: Divides an HF signal so that a low-frequency counter can display the operating frequency
3-41F6 What is the term for the ratio between the largest tolerable receiver input signal and the minimum discernible signal? A. Intermodulation distortion B. Noise floor C. Noise figure D. Dynamic range
Answer D: Dynamic range
3-37E4 What is a bistable multivibrator circuit commonly named? A. AND gate B. OR gte C. Clock D. Flip-flop
Answer D: Flip-flop
3-23C4 What are the three terminals of a TRIAC? A. Emitter, base 1, and base 2 B. Base, emitter, and collector C. Gate, source, and sink D. Gate, anode 1, and anode 2
Answer D: Gate, anode 1, and anode 2
3-43F5 What condition must exist for a circuit to oscillate? It must: A. Have a gain of less than 1 B. Be neutralized C. Have sufficient negative feedback D. Have sufficient positive feedback
Answer D: Have sufficient positive feedback
3-35E1 In a negative-logic circuit, what level is used to represent a logic "0"? A. Low level B. Positive-transition level C. Negative-transition level D. High level
Answer D: High level
3-33E5 Which of the following instruments would be best for checking a TTL logic circuit? A. VOM B. DMM C. Continuity tester D. Logic probe
Answer D: Logic probe
3-30D1 What is the main advantage of using an op-amp audio filter over a passive LC audio filter? A. Op-amps are largely immune to vibration and temperature change B. Most LC filter manufacturers have retooled to make op-amp filters C. C Op-amps are readily available in a wide variety of operational voltages and frequency ranges D. Op-amps exhibit gain rather than insertion loss
Answer D: Op-amps exhibit gain rather than insertion loss
3-36E6 An R-S flip-flop is capable of doing all of the following except: A. Accept data input into R-S inputs with CLK initiated B. Accept data input into PRE and CLR inputs without CLK being initiated C. Refuse to accept synchronous data if asynchronous data is being input at the same time D. Operate in toggle mode with R-S inputs held constant and CLK initiated
Answer D: Operated in toggle mode with R-S inputs held constatnt and CLK initiated
3-34E2 What is a characteristic of a NAND gate? A. Produces a logic "0" at its output only when all inputs are logic "0" B. Produces a logic "1" at its output only when all inputs are logic "1" C. Produces a logic "0" at its output if some but not all of its inputs are logic "1" D. Produces a logic "0" at its output only when all inputs are logic "1"
Answer D: Produces a logic "0" at this output only when all inputs are logic "1"
3-28C5 An electrical relay is a: A. current limiting device B. Device used for supplying 3 or more voltages to a circuit C. Component used mainly with HF audio amplifiers D. Remotely controlled switching device
Answer D: Remotely controlled switching device
3-29D3 How could voltage be greater across reactances in series than the applied voltage? A. Resistance B. Conductance C. Capacitance D. Resonance
Answer D: Resonance
3-46F3 What is the primary purpose of the first IF amplifier stage in a receiver? A. Noise figure performance B. Tune out cross-modulation distortion C. Dynamic response D. Selectivity
Answer D: Selectivity
3-42F4 Too much gain in a VHF receiver front end could result in this: A. Local signals become weaker B. Difficult to match receiver impedances C. Dramatic increase in receiver current D. Susceptibility of intermodulation interference from nearby transmitters
Answer D: Susceptibility of intermodulation interference from nearby transmitters
3-23C3 Which of the following devices acts as two SCRs connected back to back, but facing in opposite directions and sharing a common gate? A. JFET B. Dual-gate MOSFET C. DIAC D. TRIAC
Answer D: TRIAC
3-44F2 What is the mixing process in a radio receiver? A. The elimination of noise in a wideband receiver by phase comparison B. The elimination of noise in a wideband receiver by phase differentiation C. Distortion caused by auroral porpogation D. The combination of two signals to produce sum and difference frequencies
Answer D: The combination of two signals to produce sum and difference frequencies
3-22C1 In a linear electronic voltage regulator: A. The output is a ramp voltage B. The pass transitor switches from the "off" state to the "on" state C. The control device is switched on or off, with the duty cycle proportional to the line or load conditions D. The conduction of a control element is varied in direct proportion to the line voltage or load current
Answer D: The conduction of a control element is varied in direct proportion to the line voltage or load current
3-27C2 What determines the visible color radiated by an LED junction? A. The color of a lens in an eyepiece B. The amount of voltage across the device C. The amount of current through the device D. The materials used to construct the device
Answer D: The materials used to construct the device
3-17B6 Using the polar coordinates system, what visual representation would you get of a voltage in a sinewave circuit? A. To show the reactance which is present B. To graphically represent the AC and DC component C. To display the data on an XY chart D. The plot shows the magnitude and phase angle
Answer D: The plot shows the magnitude and phase angle
3-32D4 In Figure 3D9, determine if there is a probelm with this regulated power supply and identify the problem. A. R1 value is too low which would cause excessive base current and instantly destroy TR1 B. D1 and D2 are reversed. The power supply simply would not function C. TR1 is shown as an NPN and must be changed to a PNP D. There is no probelm with the circuit
Answer D: There is no problem with the circuit
3-24C2 What is a common use of a hot-carrier diode? A. Balanced inputs in SSB generation B. Variable capacitance in an automatic frequency control circuit C. Constant voltage reference in a power supply D. VHF and UHF mixers and detectors
Answer D: VHF and UHF mixers and detectors
3-39E3 Which of the following is not part of a MCU processor? A. RAM B. ROM C. I/O D. Voltage Regulator
Answer D: Voltage Regulator
3-46F6 When would it be more desirable to use an m-derived filter over a constant-k filter? A. When the response must be maximally flat at one frequency B. When the number of components must be minimized C. When high power level must be filtered D. When you need more attenuation at a certain frequency that is too close to the cut-off frequency for a constant-k filter
Answer D: When you need more attenuation at a certain frequency that is too close to the cut-off frequency for a constant-k filter
3-22C4 In a regulated power supply, what type of component will most likely be used to establish a reference voltage? A. Tunnel Diode B. Battery C. Pass Transistor D. Zener Diode
Answer D: Zener Diode
3-19C3 What does the photoconductive effect in crystalline solids produce a noticeable change in? A. the capacitance of the solid B. The inductance of the solid C. The specific gravity of the solid D. the resistance of the solid
Answer D: the resistance of the solid
3-12B3 At 240 degrees, what is the amplitude of a sine-wave having a peak value of 5 volts? A. -4.3 volts B. -2.5 volts C. +2.5 volts D. +4.3 volts
Answer: A -4.3 volts
3-44F3 In what radio stage is the image frequency normally rejected? A. RF B. IF C. LO D. Detector
Asnwer A: RF
3-3A6 Which of these will be most useful for insulation at UHF frequencies? A. Rubber B. Mica C. Wax impregnated paper D. Lead
Asnwer B: Mica
3-41F5 Which stage of a receiver primarily establishes its noise figure? A. The audio stage B. The RF stage C. The IF strip D. The local oscillator
Asnwer B: The RF stage
3-6A6 What is the peak voltage at a common household electrical outlet? A. 234 volts B. 117 volts C. 331 volts D. 165.5 volts
Asnwer D: 165.5 volts
3-1A1 The product of the readings of an AC voltmeter and AC ammeter is called: A. Apparent power. B. True power. C. Power factor. D. Current power.
Answer A. Apparent power.
3-10B6 What is the maximum rated current-carrying capacity of a resistor marked "2000 ohms, 200 watts"? A. 0.316 amps B. 3.16 amps C. 10 amps D. 100 amps
Answer A: 0.316 amps I(squared) = P/R
3-3A2 What is the relative dielectric constant for air? A. 1 B. 2 C. 4 D. 0
Answer A: 1
3-9B4 If a 100-ohm resistor is connected across 200 volts, what is the current through the resistor? A. 2 amperes B. 1 ampere C. 300 amperes D. 20,000 amperes
Answer A: 2 amperes
3-15B4 What is the time constant of a circuit having a 220-microfarad capacitor and a 1-megohm resistor in parallel? A. 220 seconds B. 22 seconds C. 2.2 seconds D. 0.22 seconds
Answer A: 220 seconds
3-15B6 What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors all in series? A. 220 seconds B. 55 seconds C. 110 seconds D. 440 seconds
Answer A: 220 seconds
3-9B1 What value of series resistor would be needed to obtain a full scale deflection on a 50 microamp DC meter with an applied voltage of 200 volts DC? A. 4 megohms B. 2 megohms C. 400 kilohms D. 200 Kilohms
Answer A: 4 megohms Ohms law: Current is Voltage divided by resistance. 200 (Volts DC) / .000050 (amps) = 4,000,000 (ohms)
3-16B3 In rectangular coordinates, what is the impedance of a network composed of a 10-microhenry inductor in series with a 40-ohm resistor, at 500 MHz? A. 40 +j31400 B. 40 -j31400 C. 31400 +j40 D. 31400 -j40
Answer A: 40 +j31400
3-11B1 What is the most the actual transmit frequency could differ from a reading of 462,100,000 hertz on a frequency counter with a time base accuracy of +/- 0.1 ppm? A. 46.21 Hz B. 0.1 MHz C. 462.1 Hz D. 0.2 MHz
Answer A: 46.21 Hz To solve this problem, remember to multiply the frequency in MHz times the time base accuracy. 462.1 x 0.1 = 46.21 Hz.
3-11B3 What is the second harmonic of SSB frequency 4146 kHz? A. 8292 kHz B. 4.146 MHz C. 2073 kHz D. 12438 kHz
Answer A: 8292 kHz It is important to know where the second harmonic will occur aboard a ship, as this second harmonic could interfere with ship-to-ship Channel 8 Alpha, 8294 kHz, on a companion receiver
3-5A6 How does the input impedance of a field-effect transistor compare with that of a bipolar transistor? A. An FET has high input impedance; a bipolar transistor has low input impedance B. One cannot compare input impedance without first knowing the supply voltage C. An FET has low input impedance; a bipolar transistor has high input impedance D. The input impedance of FETs and bipolar transistors is the same
Answer A: An FET has high input impedance; a bipolar transistor has low input impedance
3-13B4 In a circuit where the AC voltage and current are out of phase, how can the true power be determined? A. By multiplying the apparent power times the power factor B. By subtracting the apparent power from the power factor C. By dividing the apparent power by the power factor D. By multiplying the RMS voltage times the RMS current
Answer A: By multiplying the apparent power times the power factor
3-13B2 If a resistance to which a constant voltage is applied is halved, what power dissipation will result? A. Double B. Halved C. Quadruple D. Remain the same
Answer A: Double
3-4A3 Which of the 4 groups of metals listed below are the best low-resistance conductors? A. Gold, silver and copper B. Stainless steel, bronze, and lead C. Iron, lead, and nickel D. Bronze, zinc, and manganese
Answer A: Gold, silver and copper
3-1A3 What is the term used to express the amount of electrical energy stored in an electrostatic field? A. Joules. B. Coulombs. C. Watts. D. Volts.
Answer A: Joules
3-2A3 When induced currents produce expanding magnetic fields around conductors in a direction that opposes the original magnetic field, this is known as: A. Lenz's law B. Gilbert's law C. Maxwell's law D. Norton's law
Answer A: Lenz's law
3-3A4 What are the two basic types of junction field-effect trasistors? A. N-channel and P-channel B. High power and low power C. MOSFET and GaAsFET D. Silicon FET and germanium FET
Answer A: N-channel and P-channel
3-14B3 What is the term for the time required for the current in an RL circuit to build up to 63.2% of the maximum value? A. One time constant B. An exponential period of one C. A time factor of one D. One exponential rate
Answer A: One time constant
3-6A3 What is the easiest voltage amplitude to measure by viewing a pure sine wave signal on an oscilloscope? A. Peak-to-peak B. RMS C. Average D. DC
Answer A: Peak-to-peak
3-3A4 Skin effect is the phnomenon where: A. RF current flows in a thin layer of the conductor, closer to the surface, as frequency increases B. RF current flows in a thin layer of the conductor, closer to the surface, as frequency decreeases C. Thermal effects on the surface of the conductor increases the impedance D. Thermal effects on the surface of the conductor decrease the impedance
Answer A: RF current flows in a thin layer of the conductor, closer to the surface, as frequency increases
3-17B5 In polar coordinates, what is the impedance of a network comprised of a 400-ohm-reactance inductor in parallel with a 300-ohm resistor? A. 240 ohms, / -36.9 degrees B. 240 ohms, / 36.9 degrees C. 500 ohms, / 53.1 degrees D. 500 ohms, / -53.1 degrees
Answer B: 240 ohms, / 36.9 degrees
3-9B5 If a current of 3 amperes flows through a resistor connected to 90 volts, what is the resistance? A. 3 ohms B. 30 ohms C. 93 ohms D. 270 ohms
Answer B: 30 ohms
3-10B3 a 500-ohm, 20-watt resistor and a 1500-ohm, 1-watt resistor are connected in parallel. What is the maximum voltage that can be applied across the parallel circuit without exceeding wattage ratings? A. 22.4 volts B. 31.6 volts C. 38.7 volts D. 875 volts
Answer B: 31.6 volts
3-15B2 What is the time constant of a circuit having two 100-microfarad capacitors and two 470-kilohm resistors all in series? A. 470 seconds B. 47 seconds C. 4.7 seconds D 0.47 seconds
Answer B: 47 seconds
3-15B5 What is the time constant of a circuit having two 100-microfarad capacitors and two 470-kilohm resistors all in parallel? A. 470 seconds B. 47 seconds C. 4.7 seconds D. 0.47 seconds
Answer B: 47 seconds
3-11B2 The second harmonic of a 380 KHz frequency is: A. 2 MHz B. 760 kHz C. 190 kHz D. 144.4 GHz
Answer B: 760 kHz To calculate the second harmonic of 380 kHz, simply multiply it by 2, and you get 760 kHz
3-7A1 What is a sine wave? A. A constant-voltage, varying-current wave. B. A wave whose amplitude at any given instant can be represented by the projection of a point on a wheel rotating at a uniform speed. C. A wave following the laws of the trigonometric tangent function. D. A wave whose polarity changes in a random manner.
Answer B: A wave whose amplitude at any given instant can be represented by the projection of a point on a wheel rotating at a uniform speed.
3-12B6 Determine the phase relationship between the two signals shown in Figure 3B3 A. A is lagging B by 90 degrees B. B is lagging A by 90 degrees C. A is leading B by 180 degrees D. B is leading A by 90 degrees
Answer B: B is lagging A by 90 dgrees
3-4A5 How would you calculate the total capacitance of three capacitors in parallel? A. C (Sub T) = C (Sub 1) + C (Sub 2) / C (Sub 1) - C (Sub 2) + C (Sub 3) B. C (Sub T) = C (Sub 1) + C (Sub 2) + C (Sub 3) C. C (Sub T) = C (Sub 1) + C (Sub 2) / C (Sub 1) X C (Sub 2) + C (Sub 3) D. C (Sub T) = 1/C (Sub 1) + 1/C (Sub 2) + 1/C (Sub 3)
Answer B: C (Sub T) = C (Sub 1) + C (Sub 2) + C (Sub 3)
3-6A1 An AC ammeter indicates: A. Effective (TRM) values of current B. Effective (RMS) values of current C. Peak values of current D. Average values of current
Answer B: Effective (RMS) values of current
3-9B2 Which of the following Ohms Law formulas is incorrect? A. I = E/R B. I = R/E C. E = IXR D. R = E/I
Answer B: I = R/E
3-8A2 What happens to reactive power in a circuit that has both inductors and capacitors? A. It is dissipated as heat in the circuit B. It alternates between magnetic and electric fields and is not dissipated C. It is dissipated as inductive and capacitive fields D. It is dissipated as kinetic energy within the circuit
Answer B: It alternates between magnetic and electric fields and is not dissipated
3-4A1 What formula would calculate the total inductance of inductors in series? A. L (sub T) = L (Sub 1) / L (Sub 2) B. L (Sub T) = L (Sub 1) + L (Sub 2) C. L (Sub T) = 1 / L (Sub 1) + L (Sub 2) D. L (Sub T) = 1 / L (Sub 1) X L (Sub 2)
Answer B: L (Sub T) = L (Sub 1) + L (Sub 2)
3-5A5 A common emitter amplifier has: A. Lower input impedance than a common base B. More voltage gain than a common collector C. Less current gain than a common base D. Less voltage gain than a common collector
Answer B: More voltage gain than a common collector
3-14B1 What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the supply voltage? A. An exponential rate of one B. One time constant C. One exponential period D. A time factor of one
Answer B: One time constant
3-5A2 What limits the maximum forward current in a junction diode? A. The peak inverse voltage (PIV) B. The junction temperature C. The forward voltage D. The back EMF
Answer B: The junction temperature
3-8A6 Assuming a power source to have a fixed value of internal resistance, maximum power will be transferred to the load when: A. The load impedance is greater than the source impedance B. The load impedance equals the internal impedance of the source C. The load impedance is less than the source impedance D. The fixed values of internal impedance are not relative to the power source
Answer B: The load impedance equals the internal impedance of the source
3-2A6 Permeability is defined as: A. The magnetic field created by a conductor wound on a laminated core and carrying current B. The ratio of magnetic flux density in a substance to the magnetizing force that produces it C. Polarized molecular alignment in a ferromagnetic material while under the influence of a magnetizing force D. None of these
Answer B: The ratio of magnetic flux densisty in a substance to the magnetizing force that produces it
3-1A5 What formula would determine the inductive reactance of a coil if frequency and coil inductance are known? A. XL = πf L B. XL = 2πf L C. XL = 1/2πf C D. XL = 1/R2 + X2
Answer B: XL = 2πf L
3-12B2 At 150 Degrees, what is the amplitude of a sine-wave having a peak value of 5 volts? A. -4.3 volts B. -2.5 volts C. +2.5 volts D. +4.3 volts
Answer C: +2.5 volts
3-13B1 What does the power factor equal in an R-L circuit having a 60 degree phase angle between the voltage and the current? A. 0.414 B. 0.866 C. 0.5 D. 1.73
Answer C: 0.5
3-6A5 By what factor must the voltage measure in an AC circuit, as indicated on the scale of an AC voltmeter, be multiplied to obtain the average voltage value? A. 0.707 B. 1.414 C. 0.9 D. 3.14
Answer C: 0.9
3-6A2 By what factor must the voltage of an AC circuit, as indicated on the scale of an AC voltmeter, be mutipled to obtain the peak voltage value? A. 0.707 B. 0.9 C. 1.414 D. 3.14
Answer C: 1.414
3-11B4 What is the most the actual transmitter frequency could differ from a reading of 156,520,000 hertz on a frequency counter with a time base accuracy of +/- 1.0 ppm? A. 165.2 Hz B. 15.625 kHz C. 156.52 Hz D. 1.4652 MHz
Answer C: 156.52 Hz Multiply the frequency in MHz times the time base accuracy (156,520,000 x 0.000001 = 156.52 Hz? )
3-16B5 In rectangular coordinates, what is the impedance of a network composed of a 0.01-microfarad capacitor in parallel with a 300-ohm resistor, at 50 kHz? A. 150 - j159 B. 150 + j159 C. 159 - j150 D. 159 + j150
Answer C: 159 - j150
3-16B1 What is the impedance of a network composed of a 0.1-microhenry inductor in series with a 20-ohm resistor, at 30 MHz? Specify your answer in rectangular coordinates. A. 20 -j19 B. 19 +j20 C. 20 +j19 D. 19 -j20
Answer C: 20 +j19
3-10B2 What is the maximum DC or RMS voltage that may be connected across a 20 watt, 2000 ohm resistor? A. 10 volts B. 100 volts C. 200 volts D. 10,000 volts
Answer C: 200 volts
3-9B6 A relay coil has 500 ohms resistance, and operates on 125 mA. What value of resistance should be connected in series with it to operate from 110 V DC? A. 150 ohms B. 220 ohms C. 380 ohms D. 470 ohms
Answer C: 380 ohms Must calculate voltage drop before applying ohms law formula: 500 ohms x .125 amps = 62.5 volts 110 volts - 62.5 volts = 47.5 volts 47.5 volts / 0.125 Amps = 380 Ohms
3-15B3 What is the time constant of a circuit having a 100-microfarad capacitor and a 470-kilohm resistor in series? A. 4700 seconds B. 470 seconds C. 47 seconds D. 0.47 seconds
Answer C: 47 seconds
3-10B4 In figure 3B1, what is the voltage drop across R1? A. 9 volts B. 7 volts C. 5 volts D. 3 volts
Answer C: 5 volts Look at Figure 3B1 and notice that the diode is reverse biased, and will look like an open circuit to this series resistance circuit problem. Current will be the same throughout all of the circuit, and voltage drops will equal the source voltage. Combine R3 and R2 as a total of 300 ohms, R3 + R2 equals the resistance of R1, 300 ohms, so each will drop 5 volts (1/2 of total voltage, 10 volts). The voltage drop across R1 equals 5 volts.
3-17B3 In polar coordinates, what is the impedance of a network composed of a 400-ohm-reactance capacitor in series with a 300-ohm resistor? A. 240 ohms, / 36.9 degrees B. 240 ohms, / -36.9 degrees C. 500 ohms, / -53.1 degrees D. 500 ohms, / 53.1 degrees
Answer C: 500 ohms, / -53.1 degrees
3-2A2 What will produce a magnaetic field? A. A DC source not connected to a circuit B. The presence of a voltage across a capacitor C. A current flowing through a conductor D. The force that drives current through a resistor
Answer C: A current flowing through a conductor
3-2A5 What is meant by the term "back EMF"? A. A current equal to the applied EMF B. An opposing EMF equal to Really times C (RC) percent of the applied EMF C. A voltage that opposes the applied EMF D. A current that opposes the applied EMF
Answer C: A voltage that opposes the applied EMF
3-1A4 What device is used to store electrical energy in an electorstatic field? A. Battery B. Transformer C. Capacitor D. Inductor
Answer C: Capacitor
3-14B4 What is the meaning of the term "time constant of an RL circuit"? the time required for the: A. Current in the circuit to build up to 36.8% of the maximum value B. Voltage in the circuit to build up to 63.2% of the maximum value C. Current in the circuit to build up to 63.2% of the maximum value D. Voltage in the circuit to build up to 36.8% of the maximum vale
Answer C: Current in the circuit to build up to 63.2% of the maximum vlaue
3-8A3 Halving the cross-sectional area of a conductor will: A. Not affect the resistance B. Quarter the resistance C. Double the resistance D. Halve the resistance
Answer C: Double the resistance
3-3A4 What is the purpose of a bypass capacitor? A. It increases the resonant frequency of the circuit B. It removes direct current from the circuit by shunting DC to ground C. It removes alternating current by providing a low impedance path to ground D. It forms part of an impedance transforming circuit
Answer C: It removes alternating current by providing a low impedance path to ground
3-4A6 How might you reduce the inductance of an antenna coil? A. Add additional turns B. Add more core permeability C. Reduce the number of turns D. Compress the coil turns
Answer C: Reduce the number of turns
3-8A1 What is the term used to identify an AC voltage that would cause the same heating in a resistor as a corresponding value of DC voltage? A. Cosine voltae B. Power factor C. Root mean square D. Average voltage
Answer C: Root mean square
3-7A6 What type of wave is characterized by a rise time significantly faster than the fall time (or vice versa)? A. Cosine wave B. Square wave C. Sawtooth wave D. sine wave
Answer C: Sawtooth wave
3-5A3 MOSFETs are manufactured with THIS protective devise built into their gate to protect the device from static charges and excessive voltages: A. Schottky didoe B. Metal oxide varistor (MOV) C. Zener diode D. Tunnel diode
Answer C: Zener diode
3-3A1 What metal is usually employed as a sacrificial anode for corrosion control purposes? A. Platinum bushing B. Lead bar C. Zinc bar D Brass rod
Answer C: Zinc bar
3-13B5 What does the power factor equal in an R-L circuit having a 45 degree phase angle between the voltage and the current? A. 0.866 B. 1.0 C. 0.5 D. 0.707
Answer D: 0.707
3-9B3 If a current of 2 amperes flows through a 50-ohm resistor, what is the voltage across the resistor? A. 25 volts B. 52 volts C. 200 volts D. 100 volts
Answer D: 100 volts
3-10B1 What is the peak-to-peak RF voltage on the 50 ohm output of a 100 watt transmitter? A. 70 volts B. 100 volts C. 140 volts D. 200 volts
Answer D: 200 volts 50 x 100 = square root of 5000 x 1.414 = x2 = 199.97, rounded to 200.
3-15B1 What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors all in parallel? A. 22 seconds B. 44 seconds C. 440 seconds D. 220 seconds
Answer D: 220 seconds
3-17B1 What is the impedance of a network composed of a 100-picofarad capacitor in parallel with a 4000-ohm resistor, at 500 KHz? Specify your answer in polar coordinates. A. 2940 ohms, / 51.5 degrees B. 4000 ohms, / 38.5 degrees C. 5112 ohms, / -38.5 degrees D. 2490 ohms, /-51.5 degrees
Answer D: 2490 ohms, / -51.5 degrees
3-16B2 In rectangular coordinates, what is the impedance of a network composed of a 0.1-microhenry inductor in series with a 30-ohm resistor, at 5 MHz? A. 30 -j3 B. 3 +j30 C. 3 -j30 D. 30 +j3
Answer D: 30 +j3
3-7A2 How many degrees are there in one complete sine wave cycle? A. 90 Degrees B. 270 Degrees C. 180 Degrees D. 360 Degrees
Answer D: 360 Degrees
3-16B6 In rectangular coordinates, what is the impedance of a network composed of a 0.001-microfarad capacitor in series with a 400-ohm resistor, at 500 kHz? A. 318 - j400 B. 400 + j318 C. 318 + j400 D. 400 - j318
Answer D: 400 - j318
3-11B6 What is the most the actual transmitter frequency could differ from a reading of 462,100,000 hertz on a frequency counter with a time base accuracy of +/- 1.0 ppm? A. 46.21 MHz B. 10 Hz C. 1.0 MHz D. 462.1 Hz
Answer D: 462.1 Hz Not really multiplying by 1. Multiplying instead by 0.000001 because it is ppm. That's why it isn't 462.1 MHz?
3-14B2 What is the meaning of the term "time constant of an RC circuit"? The time required to charge the capacitor in the circuit to: A. 23.7% of the supply voltage B. 36.8% of the supply voltage C. 57.3% of the supply voltage D. 63.2% of the supply voltage
Answer D: 63.2% of the supply voltage
3-10B5 In Figure 3B2, what is the voltage drop across R1? A. 1.2 volts B. 2.4 volts C. 3.7 volts D. 9 volts
Answer D: 9 volts Look at figure 3B2 and note that the Zener diode will drop 3 volts from the supply 12 volts, and 12 minus 3 equals a 9-volt drop at R1.
3-7A4 What is the description of a square wave? A. A wave with only 300 degrees in one cycle B. A wave whose periodic function is always negative C. A wave whose periodic function is always positive D. A wave that abruptly changes back and forth between two voltage levels and stays at these levels for equal amounts of time
Answer D: A wave that abruptly changes back and forth between two voltage levels and stays at these levels for equal amounts of time
3-3A5 Corrosion resulting from the electric current flow between dissimilar metals is called: A. Electrolysis B. Stray current corrosion C. Oxygen starvation corrosion D. Galvanic corrosion
Answer D: Galvanic corrosion
3-4A2 Good conductors with minimum resistance have what type of electrons? A. Few free electrons B. No electrons C. Some free electrons D. Many free electrons
Answer D: Many free electrons
3-8A5 How do you compute true power (power dissipated in the circuit) in a circuit where AC voltage and current are out of phase? A. Multiply RMS voltage times RMS current B. Subtract apparent power from the power factor C. Divide apparent power by the power factor D. Multiply apparent power times the power factor
Answer D: Multiply apparent power times the power factor
3-13B3 746 Watts, corresponding to the lifting of 550 pounds at the rate of one-foot-per-second, is the equivalent of how much horsepower? A. One-quarter horsepower B. One-half horsepower C. Three-quarters horsepower D. One horsepower
Answer D: One horsepower
3-1A6 What is the term for the out-of-phase power associated with inductors and capacitors? A. Effective power B. True power C. Peak envelope power D. Reactive power
Answer D: Reactive power
3-2A4 The opposition to the creation of magnetic lines of force in a magnetic circuit is known as: A. Eddy currents B. Hysteresis C. Permeability D. Reluctance
Answer D: Reluctance
3-3A3 Which metal object may be least affected by galvanic corrosion when submerged in seawater? A. Aluminum outdrive B. Bronze through-hull C. Exposed lead keel D. Stainless steel propeller shaft
Answer D: Stainless steel propeller shaft
3-12B4 What is the equivalent to the root-mean-square value of an AC voltage? A. AC voltage is the square root of the average AC value B. The DC voltage causing the same heating in a a given resistor at the peak AC voltage C. The AC voltage found by taking the square of the average value of the peak AC voltage D. The DC voltage causing the same heating in a given resistor as the RMS AC voltage of the same value
Answer D: The DC voltage causing the same heating in a given resistor as the RMS AC voltage of the same value
3-2A1 What determines the strength of the magnetic field around a conductor? A. The resistance divided by the current B. The reaction of the current to the resistance C. The diameter of the conductor D. The amount of current
Answer D: The amount of current
3-17B4 In polar coordinates, what is the impedance of a network composed of a 300-ohm-reactance capacitor, a 600-ohm-reactance inductor, and a 400-ohm resistor, all connected in series? A. 500 ohms, / 37 degrees B. 400 ohms, / 27 degrees C. 300 ohms, / 17 degrees D. 200 ohms, / 10 degrees
Answer: A: 500 ohms, / 37 degrees
3-14B5 After two time constants, the capacitor in an RC circuit is charged to what percentage of the supply voltage? A. 36.8% B. 63.2% C. 86.5% D. 95%
Answer: C 86.5%