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Avionics > 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

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

A

inductance

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4
Q

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

A

inductive reactance

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5
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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6
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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7
Q

Capacitors are sometimes used in dc circuits to

A

smooth out slight pulsations in current/voltage

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8
Q

In an ac circuit, the effective voltage is

A

Less than the maximum instantaneous voltage

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9
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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10
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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11
Q

When different rated capacitors are connected in parallel in a circuit, the total capacitance is
(Note: C(T) = C(1) + C(2) + C(3) . . .)

A

equal to the sum of all the capacitances

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12
Q

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: L(T) = L(1) + L(2) + L(3) . . .)

A

equal to the sum of the individual inductance

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13
Q

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

A

volts

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14
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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15
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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16
Q

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

A

in parallel with the unit

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17
Q

Which term means .001 ampere?

A

milliampere

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18
Q

.002KV equals

A

2.0 volts

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19
Q

What unit is used to express electrical power?

A

watt

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20
Q

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

A

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

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21
Q

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

A

3

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22
Q

Diodes are used in electrical power supply circuits primarily as

A

rectifiers

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23
Q

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

A

is called induction

24
Q

Which is correct in reference to electrical resistance?

A

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

25
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

26
Q

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

A

decrease the length or increase the cross sectional area

27
Q

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

A

iron

28
Q

Which is correct concerning a parallel circuit?

A

total resistance will be smaller than the smallest resistor

29
Q

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

A

the amperage of the circuit

30
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

31
Q

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

A

the ground reference

32
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

33
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

34
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

35
Q

Typical application for zener diodes is as

A

voltage regulators

36
Q

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

A

conduct

37
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

38
Q

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

A

the hydrometer reading does not required a temperature correction if the electrolyte temperature is 80 degrees F

39
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

40
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

41
Q

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 connected 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.

A

1 and 2

42
Q

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

A

constant voltage and varying current

43
Q

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

A

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

44
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

45
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

46
Q

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

A

contamination of both types of batteries

47
Q

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

A

in a discharge condition

48
Q

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

A

in a fully charge condition

49
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

50
Q

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

A

electrolyte becomes absorbed into the plates

51
Q

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

A

by a measured discharged

52
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

53
Q

In nickel-cadmium batteries, a rise in cell temperature

A

causes a decrease in internal resistance

54
Q

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

A

low internal resistance intensifies by high cell temperature and a high current discharge/charge rate in a constant potential charging system

55
Q

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

A

toward the end of the charging cycle

Avionics (9 decks)

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