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General Writtens > Basic Electricity > Flashcards

Basic Electricity Flashcards

1
Q

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

A

at least 50 percent greater than the highest applied voltage.

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2
Q

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

A

impedance.

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3
Q

What is the opposition to the flow of AC produced by an electromagnetic field (EMF) with generated back voltage called?

A

Inductive reactance.

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4
Q

Electrostatic fields are also known as…

A

dielectric fields.

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5
Q

The basis for transformer operation in the use of alternating current is mutual.

A

inductance.

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6
Q

The opposition offered by a coil to the flow of alternating current (ignoring resistance) is called…

A

inductive reactance.

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7
Q

What factors strengthen a coil inductor?

A

Adding coils close together.

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8
Q

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

A

Inductance and frequency.

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9
Q

When different rated capacitors are connected in series in a circuit, the total capacitance is…

A

less than the capacitance of the lowest rated capacitor.

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10
Q

Capacitors are sometimes used in DC circuits to…

A

smooth out slight pulsations in current/voltage.

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11
Q

In an AC circuit, the effective voltage is…

A

less than the maximum instantaneous voltage.

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12
Q

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

A

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

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13
Q

What is the total capacitance of a certain circuit containing three capacitors with capacitances of 0.02 microfarad, 0.05 microfarad, and 0.10 microfarad, respectively?

A

0.0125 microfarad.

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14
Q

What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of 0.02 microfarad, 0.05 microfarad, and 0.10 microfarad, respectively?

A

0.170 microfarad.

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15
Q

Converts farad to microfarads by…

A

multiplying farads by 10 to the power of 6.

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16
Q

Convert farads to picofarads by…

A

multiplying farads by 10 to the power of 12.

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17
Q

Unless otherwise specified, any values given for current or voltage in an AC circuit are assumed to be…

A

effective values.

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18
Q

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

A

equal to the sum of all the capacitances.

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19
Q

When inductors are connected in series in a circuit, the total inductance (where the magnetic fields of each inductor do not affect the others) is… (Note: Lt = L1 + L2 + L3…)

A

equal to the sum of the individual inductances.

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20
Q

When more than two inductors of different inductances are connected in parallel in a circuit, the total inductance is…

A

less than the inductance of the lowest rated inductor.

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21
Q

What is the total capacitance of a certain circuit containing three capacitors with capacitances of 0.25 microfarad, 0.03 microfarad, and 0.12 microfarad, respectively? (Note: Ct = C1 + C2 + C3)

A

0.4 microfarad.

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22
Q

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

A

Two lights requiring 3 amperes each in a 24-volt parallel system.

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23
Q
A

450 watts.

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24
Q

A 12-volt electric motor has 1000 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)

A

1000 watts.

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25
Q

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?

A

25.23 amperes.

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26
Q

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

A

994.6 watts.

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27
Q

The potential difference between two conductors which are insulated from each other is measured in…

A

volts.

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28
Q

Which effect does not apply to the movement of electrons flowing in a conductor?

A

Static energy.

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29
Q

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?

A

24 volts.

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30
Q

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

A

less than the apparent power.

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31
Q

How much power is being furnished to the circuit?

A

2645 watts.

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32
Q

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?

A

10 ohms.

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33
Q

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

A

3 ohms.

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34
Q

If resistor R3 is disconnected at terminal D, what will the ohmmeter read?

A

Infinite resistance.

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35
Q

With an ohmmeter connected into the circuit as shown, what will the ohmmeter read?

A

10 ohms.

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36
Q

How many instruments (voltmeters and ammeters) are installed correctly?

A

Two.

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37
Q

The correct way to connect a test voltmeter in a circuit is…

A

in parallel with a unit.

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38
Q

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

A

Zero voltage.

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39
Q

What does the letter Q symbolize when measuring electrical charge?

A

Coulomb.

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40
Q

Which term means 0.001 ampere?

A

Milliampere.

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41
Q

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…

A

equal to the voltage across the 20-watt light.

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42
Q

A 14-ohm resistor is to be installed in a series circuit carrying 0.05 ampere. How much power will the resister be required to dissipate?

A

At least 35 milliwatts.

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43
Q

0.002 kV equals…

A

2.0 volts.

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44
Q

What is the measured voltage of the series-parallel circuit between terminals A and B?

A

3.0 volts.

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45
Q

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?

A

24 ohms.

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46
Q

Which requires the most electrical power?

A

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

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47
Q

What unit is used to express electrical power?

A

Watt.

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48
Q

What is the basic unit of electrical quantity?

A

Coulomb.

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49
Q

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

A

26 ohms.

50
Q

When referencing resistance in a parallel DC circuit, which of the following statements is true?

A

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

51
Q

Which of the following is commonly used as a rectifier in electrical circuits?

A

Diodes.

52
Q

Diodes are used in electrical power supply circuits primarily as…

A

rectifiers.

53
Q

Transfer of electrical energy from one circuit to another without the aid of electrical connections…

A

is called induction.

54
Q

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

0.93 ampere.

55
Q

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?

A

10 volts.

56
Q

Find the total current flowing in the wire between points C and D.

A

3.0 amperes.

57
Q

Find the voltage drop across the 8-ohm resistor.

A

24 volts.

58
Q

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.

59
Q

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

A

24 volts.

60
Q

Find the total resistance of the circuit.

A

21.2 ohms.

61
Q

Which is correct in reference to electrical resistance?

A

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

62
Q

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

A

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

63
Q

Determine the total current flow in the circuit.

A

1.4 amperes.

64
Q

In a parallel circuit with three 6-ohm resistors across a 12-volt battery, what is the total current value in the circuit?

A

6 amps.

65
Q

The total resistance of the circuit is…

A

17 ohms.

66
Q

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

A

Decrease the length or increase the cross-sectional area.

67
Q

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

A

Iron.

68
Q

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

36 ohms.

69
Q

Which is correct concerning a parallel circuit?

A

Total resistance will be smaller than the smallest resistor.

70
Q

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

A

the amperage of the circuit.

71
Q

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

A

open the circuit in order to allow cooling of the motor.

72
Q

With the landing gear retracted, the red indicator light will not come on if an open occurs in wire…

A

19.

73
Q

Wire 7 is used to…

A

close the PUSH-TO-TEST circuit.

74
Q

When the landing gear is down, the green light will not come on if an open occurs in wire…

A

6.

75
Q

What will be the effect if the PCO relay fails to operate when the left-hand tank is selected?

A

The fuel pressure crossfeed valve open light will not illuminate.

76
Q

The TCO relay will operate if 24-volts DC is applied to the bus and the fuel tank selector is in the…

A

crossfeed position.

77
Q

With power to the bus and the fuel selector switched to the right-hand tank, how many relays in the system are operating?

A

Three.

78
Q

When electrical power is applied to the bus, which relays are energized?

A

PCC and TCC.

79
Q

(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.

A

5, 6, 11, 12, 13, 15, and 16.

80
Q

Which of the components is a potentiometer?

A

3.

81
Q

The electrical symbol represented at number 5 is a variable…

A

capacitor.

82
Q

When the landing gear is up and the throttles are retarded, the warning horn will not sound if an open occurs in wire…

A

4.

83
Q

The control valve switch must be placed in the neutral position when the landing gear is down to…

A

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

84
Q

Under which condition will a ground be provided for the warning horn through both gear switches when the throttles are closed?

A

Left gear up and right gear down.

85
Q

When the throttles are retarded with only the right gear down, the warning horn will not sound if an open occurs in wire…

A

5.

86
Q

When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire…

A

6.

87
Q

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

A

The ground reference.

88
Q

What is the purpose of the ground symbol used in electrical circuit diagrams?

A

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

89
Q

Troubleshooting an open circuit with a voltmeter as shown in this circuit will…

A

permit the battery voltage to appear on the voltmeter.

90
Q

What symbol represents a variable resistor?

A

2.

91
Q

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

A

base is negative with respect to the emitter.

92
Q

In an N-P-N transistor application, the solid-state device is turned on when the…

A

base is positive with respect to the emitter.

93
Q

Typical application for zener diodes is as…

A

voltage regulators.

94
Q

Which illustration is correct concerning bias application and current (positive charge) flow?

A

1.

95
Q

Forward biasing of a solid-state device will cause the device to…

A

conduct.

96
Q

If an open occurs at R1, the light…

A

cannot be turned off.

97
Q

If R2 sticks in the up position, the light will…

A

be on full bright.

98
Q

Which statement concerning the depicted logic gate is true?

A

Any input being 1 will produce a 1 output.

99
Q

In a functional and operating circuit, the depicted logic gate’s output will be 0…

A

when one or more inputs are 0.

100
Q

Which of the logic gate output conditions is correct with respect to the given inputs?

A

2.

101
Q

Which of the following logic gates will provide an active high out only when all inputs are different?

A

XOR.

102
Q

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…

A

0.52 ohm.

103
Q

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

A

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

104
Q

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

A

The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80 degrees Fahrenheit.

105
Q

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

A

most of the acid is in the solution.

106
Q

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

A

The state-of-charge of the battery.

107
Q
A

1 and 2.

108
Q

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

A

constant voltage and varying current.

109
Q

The purpose of providing a space underneath the plates in a lead acid batter’s cell container is to…

A

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

110
Q

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

A

Heat or burn marks on the hardware.

111
Q

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

A

normal operation.

112
Q

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

A

Contamination of both types of batteries would occur.

113
Q

Which of the following describes the operating principle in a nickel-cadmium battery installed in an aircraft?

A

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

114
Q

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

A

in a discharged condition.

115
Q

The electrolyte of a nickel-cadmium battery is highest when the battery is…

A

in a fully charged condition.

116
Q

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

A

depends upon its temperature and the method used for charging.

117
Q

During discharge, nickel-cadmium batteries will show a lower liquid level than when at full charge because…

A

the electrolyte becomes absorbed into the plates.

118
Q

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

A

By a measured discharge.

119
Q

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

A

Excessive spewing is likely to occur during the charging cycle.

120
Q

In nickel-cadmium batteries, a rise in cell temperature…

A

causes a decrease in internal resistance.

121
Q

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

A

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

122
Q

When a charging current is applied to a nickel cadmium battery, the cells emit gas…

A

toward the end of the charging cycle.

General Writtens (11 decks)

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