General-Basic Electricity (Written)

A-toward the end of the charging cycle.

8102. When a charging current is applied to a nickel-cadmium battery, the cells emit gas

B-26 ohms.

8038. What is the operating resistance of a 30-watt light bulb designed for a 28-volt system?

C-3.

8039-1. Which of the following are commonly used as rectifiers in electrical circuits? 1. Anodes. 2. Cathodes. 3. Diodes.

Inductive reactance. Capacitive reactance. Resistance. Inductive reactance = ความต้านทานของขดลวดที่มีต่อไฟฟ้า AC Capacitive reactance = ความต้านทานของตัวเก็บประจุ

3 types of resistive force in an AC circuit:

C-at least 50 percent greater than the highest applied voltage.

8001. The working voltage of a capacitor in an AC circuit should be

A-Inductive reactance.

8002-1. What is the opposition to the flow of AC produced by a magnetic field with generated back voltage (EMF) called?

A-Dielectric fields.

8002-2. Electrostatic fields are also known as

C-impedance.

8002. The term that describes the combined resistive forces in an AC circuit is

A-inductance. Inductance = การเหนี่ยวนำ

8003. The basis for transformer operation in the use of alternating current is mutual Mutual = ซึ่งสัมพันธ์กัน

C-inductive reactance.

8004. The opposition offered by a coil to the flow of alternating current is called (disregard resistance)

A-Inductance and frequency. (XL = 2πfL)

8005. An increase in which of the following factors will cause an increase in the inductive reactance of a circuit?

B-smooth out slight pulsations in current/voltage. pulsations = การสั่น (คลื่นไฟฟ้า)

8006-1. Capacitors are sometimes used in DC circuits to

A-less than the capacitance of the lowest rated capacitor.

8006. (Refer to Figure 1.) When different rated capacitors are connected in series in a circuit, the total capacitance is

C-less than the maximum instantaneous voltage Instantaneous = ชั่วขณะ

8007. In an AC circuit, the effective voltage is Effective voltage = กำลังกระแสไฟฟ้าจริงที่ได้จากมาตรวัด

C-plate area and inversely proportional to the distance between the plates.

8008. The amount of electricity a capacitor can store is directly proportional to the

A-.170 µF.

8009-1 (Refer to Figure 2.) What is the total capacitance of a circuit containing three capacitance in parallel with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?

A-multiplying farads by 10 to the power of 6.

8009-2. Convert farads to microfarads by

A-multiplying farads by 10 to the power of 12.

8009-3. Convert farads to picofarads by:

C-.0125 µF.

8009. (Refer to Figure 2.) What is the total capacitance of a certain circuit containing three capacitors with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?

B-effective values. Effective values = ค่ายังผล (ค่าที่ได้จากการวัดค่ากระแสหรือความต่างศักย์)

8010. Unless otherwise specified, any values given for current or voltage in an AC circuit are assumed to be Unless otherwise specified = เว้นจากที่ระบุไว้

C-The ground reference.

8072. When referring to an electrical circuit diagram, what point is considered to be at zero voltage?

C-equal to the sum of all the capacitances.

8011. When different rated capacitors are connected in parallel in a circuit, the total capacitance is (Note: CT = C₁ + C₂ + C₃...)

C-equal to the sum of the individual inductances.

8012. When inductors are connected in series in a circuit, the total inductance is (where the magnetic fields of each indicator do not affect the other) (Note: LT = L₁ + L₂ + L₃...)

A-less than the inductance of the lowest rated inductor.

8013. (Refer to Figure 3.) When more than two inductors of different inductances are connected in parallel in a circuit, the total inductance is

A-.4 µF.

8014. What is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively? (Note: CT = C₁ + C₂ + C₃)

C-Two lights requiring 3 amperes each in a 24-volt parallel system. P = EI P = 2 x 3 x 24 = 144

8015. Which requires the most electrical power during operation? (Note: 1 horsepower = 746 watts)

C-450 watts. 746 ÷ 5 = 149.5 3 x 20 = 60 24 x 5 = 120 24 x 5 = 120 Total = 449.5 ≈ 450

8016. How much power must a 24-volt generator furnish to system which contains the following loads? Unit Rating One motor (75 percent efficient) 1/5 hp Three position lights 20 watts each One heating element 5 amp One anti collision light 5 amp (Note: 1 horsepower = 746 watts) Collision = การชนกัน

A-1,000 watts. (The same)

8017. A 12-volt electric motor has 1,000 watts input and 1 horsepower output. Maintaining the same efficiency, how much input power will a 24-volt, 1-horsepower electric motor require? Efficiency = ประสิทธิภาพ

C-25.23 amperes. Find Rt: 3(1/6) + 2(1/5) = 9/10 Rt = 10/9 I = E/R = 28 x 9/10 = 25.2

8018. How many amperes will a 28-volt generator be required to supply to a circuit containing five lamps in parallel, three of which have a resistance of 6 ohms each and two of which have a resistance of 5 ohms each?

C-994.6 watts.

8019. A 1-horsepower, 24-volt DC electric motor that is 80 percent efficient requires 932.5 watts. How much power will a 1-horsepower, 12-volt DC electric motor that is 75 percent efficient require? (Note: 1 horsepower = 746 watts)

C-Static energy.

8020-1. Which effect does not apply to the movement of electrons flowing in a conductor? Conductor = ตัวนำไฟฟ้า

A-volts.

8020. The potential difference between conductors which are insulated from each other is measured in Potential = ศักย์ทางไฟฟ้า Insulated = กันความร้อน

C-24 volts.

8021. A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value. What is the voltage drop across each resistor?

C-less than the apparent power.

8022. When calculating power in a reactive or inductive AC circuit, the true power is

C-2,645 watts. E = RI² = 5 x 23² = 2645

8023. (Refer to Figure 4.) How much power is being furnished to the circuit?

C-10 ohms.

8024. (Refer to Figure 5.) What is the impedance of an AC-series circuit consisting of an inductor with a reactance of 10 ohms, a capacitor with a reactance of 4 ohms, and a resistor with a resistance of 8 ohms?

B-3 ohms.

8025. (Refer to Figure 6.) If resistor R₅ is disconnected at the junction of R₄ and R₃ as shown, what will the ohmmeter read?

A-Infinite resistance.

8026. (Refer to Figure 7.) If resistor R₃ is disconnected at terminal D, what will the ohmmeter read?

C-10 ohms. The open circuit (break) in resistor R(3) gives it an infinite resistance, and it does not affect the reading of the ohmmeter.

8027. (Refer to Figure 8.) With an ohmmeter connected into the circuit as shown, what will the ohmmeter read?

C-Two. The first ammeter is installed across the voltage. This is wrong; the ammeter will burn out. The first voltmeter will measure the source voltage (the voltage of the battery), but its polarity is wrong. It will read backward. The voltmeter across the light bulb is installed correctly. The ammeter in series with the light bulb and the battery is correct. It will read the current flowing through the light bulb.

8028. (Refer to Figure 9.) How many instruments (voltmeters and ammeters) are installed correctly?

C-Zero voltage.

8029-1. What will a voltmeter read if properly connected across a closed switch in a circuit with electrical power on?

C-in parallel with a unit.

8029. The correct way to connect a test voltmeter in a circuit is

C-Milliampere.

8030. Which term means .001 ampere?

A-equal to the voltage across the 20-watt light.

8031. A cabin entry light of 10 watts and a dome light of 20 watts are connected in parallel to a 30-volt source. If the voltage across the 10-watts light is measured, it will be

B-At least 35 milliwatts.

8032. A 14-ohm resistor is to be installed in a series circuit carrying .05 ampere. How much power will the resistor be required to dissipate?

B-2.0 volts.

8033. .002KV equals

B-3.0 volts.

8034. (Refer to Figure 10.) What is the measured voltage of the series-parallel circuit between terminals A and B?

A-24 ohms.

8035. A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of two resistors of equal value. What is the value of each resistor? (Note: Rt = E²/P)

A-A 1/5-horsepower, 24-volt motor which is 75 percent efficient.

8036. Which requires the most electrical power? (Note: 1 horsepower = 746 watts)

C-Coulomb.

8037-1. What is the basic unit of electrical quantity?

B-Watts.

8037. What unit is used to express electrical power?

B-The total current is equal to the sum of the currents through the individual branches of the circuit.

8039. Which statement is correct when made in reference to a parallel circuit?

B-rectifiers.

8040. Diodes are used in electrical power supply circuits primarily as

A-is called induction.

8041. Transfer of electric energy from one circuit to another without the aid of electrical connections

C-0.93 amperes.

8042. If three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series in a 28-volt circuit, how much current will flow through the 3-ohm resistor?

A-10 volts.

8043. A circuit has an applied voltage of 30 volts and a load consisting of a 10-ohm resistor in series with a 20-ohm resistor. What is the voltage drop across the 10-ohm resistor?

C-3.0 amperes.

8044. (Refer to Figure 11.) Find the total current flowing in the wire between points C and D.

C-24 volts.

8045-1. In a parallel circuit with four 6-ohm resistors across a 24-volt battery, what is the total voltage across resistor-three (VR3) in the circuit?

A-24 volts.

8045-2. If each cell connected in series, equals 2 volts, how would a 12-cell lead acid battery be rated?

C-24 volts.

8045. (Refer to Figure 11.) Find the voltage across the 8-ohm resistor.

C-21.2 ohms.

8046. (Refer to Figure 12.) Find the total resistance of the circuit.

B-If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater.

8047. Which is correct in reference to electrical resistance?

A-The current is stepped down by a 1 to 4 ratio.

8048. What happens to the current in a voltage step-up transformer with a ratio of 1 to 4?

B-6 amps.

8049-1. In a parallel circuit with three 6-ohms resistors across a 12-volt battery, what is the total current (It) value in the circuit?

B-1.4 amperes.

8049. (Refer to Figure 13.) Determine the total current flow in the circuit.

C-17 ohms.

8050. (Refer to Figure 14.) The total resistance of the circuit is

B-Decrease the length or increase the cross-sectional area.

8051. Which of these will cause the resistance of a conductor to decrease?

B-Iron.

8052. Through which material will magnetic lines of force pass the most readily?

A-36 ohms.

8053. A 48-volt source is required to furnish 192 watts to a parallel circuit consisting of three resistors of equal value. What is the value of each resistor?

A-Total resistance will be smaller than the smallest resistor.

8054. Which is correct concerning a parallel circuit?

C-the amperage of the circuit.

8055. The voltage drop in a circuit of known resistance is dependent on

B-open the circuit in order to allow cooling if the motor.

8056. A thermal switch, or thermal protector, as used in an electric motor, is designed to

A-No. 19

8057. (Refer to Figure 15.) With the landing gear retracted, the red indicator light will not come on if an open occurs in wire

A-close the PUSH-TO-TEST circuit.

8058. (Refer to Figure 15.) The No. 7 wire is used to

B-No. 6.

8059. (Refer to Figure 15.) When the landing gear is down, the green light will not come on if an open occurs in wire

C-The fuel pressure crossfeed valve open light will not illuminate

8060.(Refer to Figure 16) What will be the effect if the PCO relay fails to operate when the left-hand tank is selected?

B-crossfeed position

8061.(Refer to Figure 16) The TCO relay will operate if 24-volts DC is applied to the bus and the fuel tank selector is in the

A-Three.

8062. (Refer to Figure 16.) With power to the bus and the fuel selector switched to the right-hand tank, how many relays in the system are operating?

A-PCC and TCC.

8063. (Refer to Figure 16.) When electrical power is applied to the bus, which relays are energized?

C-5, 6, 11, 12, 13, 15, 16.

8064. (Refer to Figure 16.) Energize the circuit with the fuel tank selector switch selected to the left-hand position. Using the schematic, identify the switches that will change position.

B-3.

8065. (Refer to Figure 17.) Which of the components is a potentiometer?

C-capacitor.

8066. (Refer to Figure 17.) The electrical symbol represented at number 5 is a variable

A-No. 4.

8067. (Refer to Figure 18.) When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire

B-prevent the warning horn from sounding when the throttles are closed.

8068. (Refer to Figure 18.) The control valve switch must be placed in the neutral position when the landing gears are down to

C-Left gear up and right gear down.

8069. (Refer to Figure 19.) Under which condition will a ground be provided for the warning horn through both gear switches when the throttles are closed?

A-No. 5.

8070. (Refer to Figure 19.) When the throttles are retarded with only the right gear down, the warning horn will not sound if an open occurs in wire

C-No. 6.

8071. (Refer to Figure 19.) When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire

C-To show that there is a return path for the current between the source of electrical energy and the load.

8072-1. What is the purpose of the ground symbol used in electrical circuit diagrams?

C-permit the battery voltage to appear on the voltmeter.

8073. (Refer to Figure 20.) Troubleshooting an open circuit with a voltmeter as shown in this circuit will

A-2.

8074. (Refer to Figure 21.) Which symbol represents a variable resistor?

A-base is negative with respect to the emitter.

8075. In a P-N-P transistor application, the solid state device is turned on when the

C-base is positive with respect to the emitter.

8076. In a N-P-N transistor application, the solid state device is turned on when the

C-voltage regulators.

8077. Typical application for zener diodes is as

A-1.

8078. (Refer to Figure 22.) Which illustration is correct concerning bias application and current (positive charge) flow?

B-conduct..

8079. Forward biasing of a solid state device will cause the device to

C-cannot be turn off. The base and the collector will have the same voltage. The base current will be maximum, and the light cannot be turned off.

8080. (Refer to Figure 23.) If an open occurs at R₁, the light

A-be on full bright.

8081. (Refer to Figure 23.) If R₂ sticks in the up position, the light will

B-Any input being 1 will produce a 1 output.

8082. (Refer to Figure 24.) Which statement concerning the depicted logic gate is true?

C-when one or more inputs are 0.

8083. (Refer to Figure 25.) In functional and operating circuit, the depicted logic gate's output will be 0

C-XOR (Exclusive OR)

8084-1. Which of the following logic gates will provide an active hight out only when all inputs are different?

B-2.

8084. (Refer to Figure 26.) Which of the logic gate output conditions is correct with respect to the given inputs?

A-0.52 ohms.

8085. A lead-acid battery with 12 cells connected in series (no-load voltage = 2.1 volts per cell) furnishes 10 amperes to a load of 2-ohms resistance. The internal resistance of the battery in this instance is

C-Apply sodium bicarbonate solution to the affected area followed by a water rinse.

8086. If electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure should be followed?

A-The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80°F.

8087. Which statement regarding the hydrometer reading of a lead-acid battery electrolyte is true?

B-most of the acid is in the solution.

8088. A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because

B-The state-of-charge of the battery.

8089. What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source?

C-1 and 2.

8090. Which of the following statements is/are generally true regarding the charging of several aircraft batteries together? 1. Batteries of different voltages (but similar capacities) can be connected in series with each other across the charger, and charged using the constant current method. 2. Batteries of different ampere-hour capacity and same voltage can be connect in parallel with each other across the charger, and charged using the constant voltage method. 3. Batteries of the same voltage and same ampere-hour capacity must be connected in series with each other across the charger, and charged using the constant current method.

C-Constant voltage and vary current.t5dexxd

8091. The method used to rapidly charge a nickel-cadmium battery utilizes

A-prevent sediment buildup from contacting the plates and causing a short circuit.

8092. The purpose of providing a space underneath the plates in a lead acid batter's cell container is to

C-Heat or burn marks on the hardware.

8093. Which condition is an indication of improperly torqued cell link connections of a nickel-cadmium battery?

A-normal operation.

8094. The presence of any small amount of potassium carbonate deposits on the top of nickel-cadmium battery cells in service is an indication of

B-To completely charge a nickel-cadmium battery, some gassing must take place; thus, some water will be used.

8095-1. Which of the following best describes the operating principal in a nickel-cadmium battery installed in an aircraft?

C-Contamination of both types of batteries.

8095. What is the likely result of servicing and charging nickel-cadmium and lead acid batteries together in the same service area?

A-in a fully charged condition.

8096-1. The electrolyte of a nickel-cadmium battery is highest when the battery is

B-in a discharged condition.

8096. The electrolyte of a nickel-cadmium battery is the lowest when the battery is

C-depends upon its temperature and the method used for charging.

8097. The end-of-charge voltage of a 19 cell nickel-cadmium battery, measured while still on charge,

C-electrolyte becomes absorbed into the plates.

8098. Nickel-cadmium batteries which are stored for a long period of time will show a low liquid level because

B-By a measured discharge.

8099. How can the state-of-charge of a nickel-cadmium battery be determined?

B-Excessive spewing is likely to occur during the charging cycle.

8100. What may result if water is added to a nickel-cadmium battery when it is not fully charged?

C-Low internal resistance intensified by high cell temperatures and a high current discharge/charge rate in a constant potential (voltage) charging system.

8101-1. Which of the following best describes the contributing factors to thermal runaway in a nickel-cadmium battery installed in an aircraft?

B-causes a decrease in internal resistance.

8101. In nickel-cadmium batteries, a rise in cell temperature