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AS113-4H-Basic Electricity II-A1-MC(Basics) > Jeppensen Section D > Flashcards

Jeppensen Section D Flashcards

1
Q
  1. Two advantages of alternating current over direct current are
    (A)
    (B)
A

It is easy to generate
It is easy to change voltage and current values

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2
Q
  1. The waveform of alternating current produced by a rotating generator is called a _____
    Wave
A

Sine

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3
Q
A
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4
Q
  1. A _____ is one complete sequence of voltage or current changes from zero to a positive peak to zero then through a negative peak, and back to zero.
A

Cycle

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5
Q
  1. An_______ is one-half of an AC cycle.
A

Alternation

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6
Q
  1. The time required for one cycle of events to occur is known as the ______ of alternating
    current.
A

Period

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7
Q
  1. The number of complete cycles per second is the ______ of AC and is expressed in
    ________.
A

Frequency
Hertz

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8
Q
  1. The AC power used in most aircraft is ______ hertz.
A

400

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9
Q
  1. A rotating generator having four poles and turning at 1.800 rpm will generate an AC with a frequency of _____ hertz.
A

60

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10
Q
  1. In an AC circuit the product of the voltage and the current is the ________ and is expressed in ________
A

Apparent power
Volt-amps

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11
Q
  1. True power in an AC circuit is expressed in terms of _______ (watts or volt-amps).
A

Watts

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12
Q
  1. The ratio between the true power and the apparent power in an AC circuit is known as the
    ___________
A

Power Factor

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13
Q
  1. The maximum value of voltage in either the positive or negative direction is known as the ________ voltage.
A

Peak

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14
Q
  1. The maximum difference between the positive and negative peak values of alternating voltage or current is called the _______ value.
A

Peak-to-Peak

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15
Q
  1. The average value of alternating current is calculated by multiplying _______ by the peak value.
A

0.637

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16
Q

The RMS value of AC is ________ times the peak value

A

0.707

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17
Q
  1. Another name for the RMS value of AC is the ______ value
A

effective

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18
Q
  1. A purely resistive circuit has a power factor of _________
A

One

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19
Q
  1. Inductance opposes a change in current by the generation of a _______
A

Back Voltage

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20
Q
  1. The amount of induction in a coil is affected by the
    a.
    b.
    c.
    d.
    e.
A

Number of turns of wire
Spacing between the turns
Number of layers of winding
Ratio of the diameter of the coil to the length
Material used for the core

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21
Q
  1. Increasing the inductance of a coil will _______ (increase or decrease) the amount of AC that can flow
A

Decrease

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22
Q
  1. When inductors are connected in series, the total inductance can be found using what formula? __________
A

LT=L1+L2+L3+…

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23
Q
  1. The total inductance is millihenries.
A

230

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24
Q
  1. When inductors are connected in parallel. the total inductance can be found using what formula?
A

LT= 1/ (1/L1+1/L2+1/L3)

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25
Q
A
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26
Q
A
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27
Q
A
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28
Q
A
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29
Q
A
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30
Q
  1. The opposition to current flow in a conductor caused by the generation of a hack voltage as the magnetic field cuts across the conductor is called _________
A

Inductive Reactance

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31
Q

31 Inductive reactance is indicated by the symbol _______.

A

X1

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32
Q
  1. Inductive reactance is measured in ______.
A

Ohms

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33
Q
  1. Inductive reactance ______ (increases or decreases) as the frequency increases.
A

Increases

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34
Q
  1. Inductive reactance may be calculated using what formula?________
A

XL = 2pifL

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35
Q
  1. Find the inductive reactance caused by the presence of a 300-millihenry choke in a 400-hertz circuit. _______ ohms
A

753.6

36
Q
  1. Find the inductive reactance caused by the presence of a 1.2-henry choke in a 400-hertz circuit. _______ ohms
A

3,014.4

37
Q
  1. in a purely inductive circuit, the current _______ (leads or lags) the voltage,
A

lags

38
Q
  1. The phase angle between the current and voltage in a purely inductive circuit is _____
A

90 degrees

39
Q
  1. The power factor of a purely inductive circuit is _______
A

Zero

40
Q
  1. A(n) ______ is a type of inductor installed in a circuit to impede the flow of AC of a particular frequency, while not affecting the flow of AC below that frequency.
A

Choke

41
Q
  1. A(n) ______ is used to step up or step down an AC voltage.
A

Transformer

42
Q
A
43
Q
  1. Electrical energy is stored in a capacitor in _____ fields.
A

Electrostatic

44
Q
  1. The strength of an electrostatic field to determined by the _______ (voltage or current)
A

Voltage

45
Q
  1. A capacitor consists of two ______ separated by a(n) __________
A

Conductors
Dielectric

46
Q
  1. The basic unit of capacitance is the ________
A

farad

47
Q
  1. The three variables that affect the capacity of a capacitor are
    A.
    B.
    C.
A

The area of the plates
The distance the plates are apart
The dielectric constant of the dielectric

48
Q
  1. Fifty microfarads = __________ farads
A

0.000050

49
Q
  1. A capacitor with a thin dielectric has _____ (more or less) capacity than the same capacitor with a thick dielectric.
A

More

50
Q
  1. The working voltage of a capacitor is rated in ________ (AC or DC) volts.
A

DC

51
Q
  1. The reference dielectric is air which has a dielectric constant of _________
A

one

52
Q
  1. The formulas for finding total series capacitance are the same as those used for finding the total resistance of resistors connected in ________ (series or parallel).
A

parallel

53
Q
A
54
Q
A
55
Q
  1. What formula is used for finding the total capacitance of capacitors connected in parallel?
    ______________
A

CT= C1+C2+C3

56
Q
A
57
Q
  1. The time constant of a capacitive circuit is determined by the ______ and the _______ of the circuit.
A

Capacitance and the Resistance

58
Q
  1. In an R-C circuit, changes in current ________ (lead or lag) changes in the voltage.
A

Lead

59
Q
A
60
Q
  1. The opposition to the flow of alternating current caused by a capacitor in a circuit is known as _______.
A

Capacitive reactance

61
Q
  1. Capacitive reactance ________ ( increases or decreases ) as the frequency of the circuit increases.
A

Decreases

62
Q
A
63
Q
A
64
Q
  1. When a large amount of capacity is needed with a low working voltage, a(n) _____ ( electrolytic or non electrolytic ) capacitor is used.
A

Electrolytic

65
Q
  1. Three types of opposition to the flow of alternating current are
    A.
    B.
    C.
A

Resistance
Inductive Reactance
Capacitive Reactance

66
Q
  1. The total opposition to the flow of alternating current is called _____.
A

Impedance

67
Q
  1. Total reactance is the _____ (sum of or difference between) the inductive and the capacitive reactance.
A

Difference

68
Q
A
69
Q
A
70
Q
  1. Power factor is the ratio of the ______ of the circuit to the impedance.
A

Resistance

71
Q
  1. Phase angle is the angle whose ______ (sine or cosine) is the power factor.
A

Cosine

72
Q
A
73
Q
A
74
Q
  1. True power may be found using the formula ________
A

Power Factor

75
Q
  1. True power is measured in _______ (watts or volt-amps).
A

Watts

76
Q
  1. Apparent power is the product of the source voltage times the ________ ________
A

Total current

77
Q
A
78
Q
A
79
Q
  1. What equation may be used to find the resonant frequency of an AC circuit? Resonant frequency = _______
A

FR= 1/ (2pi/LC)

80
Q
  1. Resonant frequency = ______ hertz
A

24.42

81
Q
  1. Current flow is ______(maximum or minimum) in a series RCL circuit at resonant frequency.
A

Maximum

82
Q
  1. Resonant frequency is ______ hertz
A

1,592

83
Q
  1. The source current is _______ (maximum or minimum) in a parallel RCL circuit at its resonant frequency.
A

Minimum

84
Q
  1. Circulating current in a parallel RCL circuit is _______(maximum or minimum) at the resonant frequency of the combination.
A

Maximum

85
Q
  1. Two ways of connecting the three windings of a three-phase AC generator are:
    a.
    b.
A

Y
Delta

86
Q
  1. A(n) _______ may be used to convert alternating current to direct current.
A

Rectifier

AS113-4H-Basic Electricity II-A1-MC(Basics) (10 decks)

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