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Airframe General > Fundamentals of Electricity and Electronics > Flashcards

Fundamentals of Electricity and Electronics Flashcards

1
Q

(Refer to figure 15) Wire 7 is used to

A

Close the PUSH-TO-TEST circuit.

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2
Q

(Refer to figure 18) When the landing gear is up and the throttles are retarded, the warning horn will not sound if an open occures in wire

A

4

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3
Q

(Refer to figure 23) If R(2) sticks in the up position, the light will

A

Be on full bright

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4
Q

(Refer to figure 7) If resistor R(3) is disconnected at terminal D, what will the ohmmeter read

A

Infinate resistance

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5
Q

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

A

equal to the sum of all capacitances

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6
Q

(Refer to figure 9) How many instruments (voltmeters and ammmeters) are installed correctly

A

Two

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7
Q

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

A

Inductive resistance

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8
Q

(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

A

6

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9
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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10
Q

The 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

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11
Q

Capacitors are sometimes used in DC circuits to

A

Smooth out slight pulsations in current/voltage

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12
Q

(Refer to figure 6) If resistor R(5) is disconnected at the junction of R(4) and R(3) as shown, what will the ohmmeter read

A

3 ohms

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13
Q

(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

A

5

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14
Q

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

A

3.0 amperes

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15
Q

(Refer to figure 18) 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

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16
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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17
Q

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

A

Static energy

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18
Q

(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

Crossfeed position

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19
Q

What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?

A

.170 uF

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20
Q

The voltage drop in a circuit of known resistance is dependant on

A

The amperage of the circuit

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21
Q

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

A

XOR

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22
Q

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

A

volts

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23
Q

which of these will cause the resistance of a conductor to decrease

A

decrease the length or increase the cross-sectional area

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24
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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25
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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26
Q

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

A

in a discharged condition

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27
Q

Electrostatic fields are also known as

A

dielectric fields

28
Q

Which of the following statements is/are generally true regarding the charging of several aircraft batteries together

A

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 connected in parallel with each other across the charger, and charged using the constant voltage method.

29
Q

(Refer to figure 10) What is the measure voltage of the series-parallel circuit between terminals A and B

A

3.0 volts

30
Q

Convert farads to microfarads by

A

Multiplying farads by 10 to the power of 6

31
Q

(Refer to figure 21) Which symbol represents a variable resistor

A

2

32
Q

What does the letter Q symbolize when measuring electric charge

A

Coulomb

33
Q

(Refer to figure 12) Find the total resistance of the circuit

A

21.2 ohms

34
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.

35
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

36
Q

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

A

The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80F

37
Q

(refer to figure 4) How much power is being furnished to the circuit

A

2,645 watts

38
Q

(refer to figure 3) 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

39
Q

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

A

.0125uF

40
Q

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

A

by a measured discharge

41
Q

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

A

conduct

42
Q

(Refer to figure 15) with the landing gear retracted, the red indicator light will not come on if an open occurs in wire

A

19

43
Q

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

A

impedence

44
Q

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

A

inductive reactance

45
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

46
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

47
Q

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

A

iron

48
Q

Which of the following best describes the operating principal 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

49
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

50
Q

How much power must a 24-volt generator furnish to a system which contains the following loads?
One motor (75% efficient) 1/2 HP
Three position lights 20 watts each
One heating element 5 amp
One anticollision light 3 amp
(note: 1 hp = 746 watts)

A

450 watts

51
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

52
Q

(Refer to figure 14) The total resistance of the circuit is

A

17 ohms

53
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

54
Q

(Refer to figure 64) 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: R(t) = E^2/P)

A

24 ohms

55
Q

(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

Left gear up and right gear down

56
Q

In nickel-cadmium batteries, a rise in cell temperature

A

causes a decrease in internal resistance

57
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

A

994.6 watts

58
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

59
Q

(refer to figure 11) Find the voltage across the 8-ohm resistor

A

24 volts

60
Q

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

A

excessive spewing is likely to occur during the charging cycle

61
Q

.002 kV equals

A

2.0 volts

62
Q

(refer to figure 64) 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

63
Q

Which is correct concerning a parallel circuit

A

Total resistance will be smaller than the smallest resistor

64
Q

What is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively

A

.4uF

65
Q

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

A

is called induction

66
Q
A

Airframe General (1 decks)

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