General-Electrical
The opposition offered by a coil to the flow of alternating current is called (disregard resistance)
Inductive reactance.
(Refer to Figure 18.) When the landing gears are up and the throttles are retarted, the warning horn will not sound if an open occurs in wire
No. 4.
(Refer to Figure 15.) The No. 7 wire is used to
Close the PUSH-TO-TEST Circuit
(refer to figure 2) What is the total capacitance of a circuit containing three capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?
.170 MF.
What is the operating resistance of a 30-watt light bulb designed for a 28-volt system? (Note: R= E squared/P
26 ohms.
(Refer to Figure 4.) How much power is being furnished to the circuit?
2,645 Watts. (P=I2xR=23 squared x 5= 2,645 watts)
Forward biasing of a solid state device will cause the device to
Conduct.
(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?
.0125 MF.
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)
.4 MF.
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
0.52 ohm.
If three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series ina 28-volt circuit, how much current will flow through the 3-ohm resistor? (Note: I= E/R
0.93 ampere.
Which of the following statements is/are generally true regarding the charging of several aircraft batteries together? See page 25 test guide.
1 and 2
(Refer to Figure 22.) what illustration is correct concerning bias application and current (positive charge) Flow?
1.
(Refer to Figure 13.) Determine the total current flow in the circuit?
1.4 amperes.
(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?
10 ohms.
(Refer to Figure 8.) With an ohmmeter connected into the circuit as shown, what will the ohmmeter read?
10 ohms.
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?
10-volts.
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? (Note: 1 Horsepower= 746 watts)
1000 Watts.
(Refer to Figure 21.) What symbol represents a variable resistor?
2
(Refer to Figure 26.) What logic gate output conditions is correct with respect to the given inputs?
2
.002KV equals
2.0 volts.
(Refer to Figure 12.) Find the total resistance of the circuit.
21.2 ohms.
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= Esquared/P)
24 ohms.
(Refer to Figure 11.) Find the voltage across the 8-ohm resistor.
24 volts.
A 24-volt source is required to furnish 48 watts to a parallel circuitconsisting of four resistors of equal value. What is the voltage drop across each resistor?
24 volts.
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 5 ohms each?
25.23 amperes.
(Refer to Figure 17.) Which of the components is a potentiometer?
3
(Refer to Figure 6.) If resistor R5 is disconnected at the junction of R4 and R3 as shown, What will the ohm-meter read?
3 ohms.
(Refer to Figure 10.) What is the measured voltage of the series-parallel circuit between terminals A and B?
3.0 Volts.
(Refer to Figure 11.) Find the total current flowing in the wire between points C and D.
3.0 amperes
(Refer to Figure 14.) The total resistance of the circuit is
35 ohms
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?
36 ohms.
How much power must a 24-volt generator furnish to a system which contains the following loads? UNIT RATING One motor (75 percent efficient)........................1/5hp Three position lights.................................20 watts ea One heating element.......................................5 amp One anticollision light......................................3 amp (Note: 1 horsepower = 746watts)
450 watts.
(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.
5,6,11,12,13,15,16.
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?
994.6 watts. (746/0.75= watts)
What requires the most electrical power? (Note: 1 horsepower= 746 watts)
A 1/5-horsepower, 24-volt motor which is 75 percent efficient.
What is Electric current? What is Symbol?
Amperes (I)
(Refer to Figure 24.) What statement concerning the depicted logic gate is true?
Any input being 1 will produce a 1 output.
If electrolyte from a lead-acid battery is spilled in the battery compartment, what procedure should be followed?
Apply sodium bicarbonate solution to the affected area followed by a water rinse.
A 14-ohm resistor is to be installed in a series circuit carrying .05 ampere. How much power wil the resistor be required to dissipate?
At least 35 milliwatts.
What is the likely result of servicing and charging nickel-cadmium and lead acid batteries together in the same service area?
Contamination of both types of battieries
In nickel-cadmium batteries, a rise in cell temperature
causes a decrease in internal resistance.
What will cause the resistance of a conductor to decrease?
Decrease the length or inscrease the cross-sectional area.
What are commonly used as rectifiers in electical circuits?
Diodes.
Nickel-cadmium batteries which are stored for a long period of time will show a low liquid level becuase
Eelctolyte becomes absorbed into the plates.
When different rated capacitors are connected in parallel in a circuit, the total capacitance is (Note: Ct=C1+C2+C3....)
Equal to the sum of all the capacitances.
When inductors are connected in series in a circuit, the total inductance is (where the magnetic fields of each inductor do not affect the others) (Note: Lt= L1+L2+L3...)
Equal to the sum of the individual inductances.
What may results if water is added to a nickel-cadmium battery when it is not fully charged?
Excessive spewing is likely to occur during the charging cycle.
What condition is an indication of improperly torqued cell link connection sof a nickel-cadmium battery?
Heat or burn makrs on the hardware.
What is the correct reference to eletrical resistance?
If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater.
The term that describes the combined resistance forces in an AC circuit is
Impedance.
An inscrease in which of the following factors will cause an increase in the inductive reactance of a circuit?
Inductance and frequancy
(Refer to Figure 7.) If resistor R3 is disconnected at terminal D, what will the ohmeter read?
Infinite resistance.
Through what material will magnetic lines of force pass the most readily?
Iron.
(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?
Left gear up and right gear down.
What best describes the contributing factors to thermal runaway in a nickel-cadmuim battery installed in an aircraft?
Low internal resistance intensified by high cell temperatures and high current discharge/charge rate in a constant potential charging system.
What term means .001 ampere?
Milliampere.
(Refer to Figure 15.) With the landing gear retracted, the red indicator light will not come on if an open occurs in wire
No. 19.
(Refer to Figure 19.) When the throttles are retarted with only the right gear down, the warning horn will not sound if an open occurs in wire
No. 5.
(Refer to Figure 15.) When the landing gear is down, the green light will not come on if an open occurs in wire
No. 6.
(Refer to Figure 19.) When the landing gears are up and the throttles are retarted, the warning horn will not sound if an open occurs in wire
No. 6.
The presence of any small amount of potassium carbonate deposits on the top of nickel-cadmium battery cells in service is an indication of
Normal operation
What is the measurement for Resistance? Symbol?
Ohms (R)
A thermal switch, or thermal protector, as used in an electric motor, is designed to
Open the circuit in order to allow cooling of the motor.
(Refer to Figure 16.) When electrical power is applied to the bus, which relays are energized?
PCC and TCC.
What happens to the current in a voltage step-up transformer with a ratio of 1 to 4?
The current is stepped down by a 1 to 4 ratio.
(Refer to Figure 16.) What will be the effect if the PCO relay fails to operate when the left-hand tank is selected?
The fuel pressure crossfeed valve open light will not illuminate.
When refering to an electrical circuit diagram, what point is considered to be at zero voltage?
The ground reference.
Regarding the hydrometer reading of a lead-acid storage battery electrolyte is true?
The hydrometer reading does not require a temerature correction if the electrolyte temperature is 80 degrees F.
What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source?
The state-of-charge of the battery.
What statement is correct when it comes to a parallel circuit?
The total current is equal to the sum of the currents through the individual branches of the circuit.
(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?
Three
What will a voltmeter read if properly connected across a closed switch in a circuit with electrical power on?
Zero voltage.
What is the purpose of the ground symbol used in electrical circuit diagrams?
To show that there is a return path for the current between the source of electrical energy and the load.
What is correct concerning a parallel circuit?
Total resistance will be smaller than the smallest resistor.
(Refer to Figure 9.) How many instruments (voltmeters and ammeters) are installed correctly?
Two
What requires the most electrical power during operation?
Two lights requiring 3 amperes each in a 24-volt parallel system.
What is Electric pressure? What is Symbol?
Volt (E)
The potential difference between two conductors which are insulated from each other is measured in
Volts
What is the measurement for power? symbol?
Watt (p)
What unit is used to express electrical power?
Watt.
The working voltage of a capacitor in an AC circuit should be
at least 50 percent greater than the highest applied voltage.
In a P-N-P transistor application, the solid state device is turned on when the
base is negative with respect to the emmiter.
In an N-P-N transistor application, the solid state device is turned o when the
base is positive with respect to the emitter.
(Refer to Figure 23.) If R2 sticks in the up position, the light will
be on full bright.
How can the state-of-charge of a nickel-cadmium battery be determined?
by measuring discharge.
(Refer to figure 23.) If an open occurs at R1, the light
cannot be turned off.
(Refer to Figure 17.) The electrical symbol represented at number 5 is a variable
capacitor.
The method used to rapidly charge a nickel cadmium battery utilizes
constant voltage and varying current.
(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
crossfeed position.
The end-of-charge voltage of a 19-cell nickel-cadmium battery, measured while still on charge,
depends upon its temperature and the method used for charging.
Unless otherwise specified, any values given for current or voltage in an AC circuit are assumed to be
effective values.
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-watt light is measured, it will be
equal to the voltage across the 20-watt light.
The electrolyte of a nickel-cadmium battery is the lowest when the battery is
in a discharged condition
The electrolyte of a nickel cadmium battery is hightest when the battery is
in a fully charged condition
The correct way to connect a test voltmeter in a circuit is
in parallel with a unit.
The basis for tranformer operation in the use of alternating current is mutual
inductance
Transfer of electric energy from one circuit to another without the aid of electrical connections
is called induction
When calculating power in a reactive or inductive AC circuit, the true power is
less than the apparent power.
(refer to Figure 1) When different rated capacitors are connected in series in a circuit, the total capacitance is
less than the capacitance of the lowest rated capacitor.
(Refer to Figure 3.) When more than two inductors of different inductances are connected in parallel in a circuit, the total inductance is
less than the inductance of the lowest rated inductor.
In an AC circuit, the effective voltage is
less than the maximum instantaneous voltage.
A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because
most of the acid is in the solution
(Refer to Figure 20.) Troubleshooting an open circuit with a voltmeter as shown in this circuit will
permit the battery voltage to appear on the voltmeter.
The amount of eletricity a capacitor can store is directly proportional to the
plate area and inversely proportional to the distance between the plates.
The purpose of providing a space underneath the plates in a lead acid batter's cell container is to
prevent sediment buildup from contacting the plates and causing a short circuit.
(Refer to Figure 18.) The control valve switch must be placed in the neutral position when the landing gears are down to
prevent the warning horn from sounding when the throttles are closed.
Diodes are used in electrical power supply circuits primarly as
rectifiers.
Capacitors are sometimes used in DC circuits to
smooth out slight pulsations in current/voltage.
The voltage drop in a circuit of known resistance is dependent on
the amperage of the circuit.
When charging current is applied to a nickel-cadmuim battery, the cells emit gas
toward the end of the charging cycle.
Typically application for zener diodes is as
voltage regulators.
(Refer to Figure 25.) In a functional and operating circuit, the depicted logic gate's output will be 0
when one or more inputs are 0.