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AEIS > AEIS CHAPTER 1 > Flashcards

AEIS CHAPTER 1 Flashcards

1
Q

What is the Formula for EMF

A

e = Blvsinθ

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2
Q

e in e = Blvsinθ represents

A

emf

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3
Q

B in e = Blvsinθ represents

A

flux intensity

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4
Q

l in e = Blvsinθ represents

A

conductor length

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5
Q

v in e = Blvsinθ represents

A

speed of conductor cutting the flux lines

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6
Q

θ in e = Blvsinθ represents

A

relative angle between conductor and flux lines

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7
Q

What is the Formula for frequency

A

f = NP/120

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8
Q

N in f = NP/120 represents

A

conductor rotation speed in rpm

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9
Q

P in f = NP/120 represents

A

number of poles in machine

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10
Q

What is a CSD/CSU

A

Constant Speed Drive/Unit

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11
Q

What is the purpose of a CSD/CSU?

A

to ensure alternator will produce a constant output frequency and voltage regardless of engine speed

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12
Q

IDG =

A

Integrated Drive Generator

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13
Q

IDG consists of

A

CSD + Generator mounted side by side into one compact unit

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14
Q

what is normal practice to combat the large amount of heat produced by an IDG

A

use oil as a cooling medium, which is pumped through the generator

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15
Q

single phase emf has i) conductor loop

A

one

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16
Q

three phase emf has i) conductor loop i) apart

A

three, 120deg

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17
Q

the armature in an alternator is i) while the field ii)

A

stationary, rotates

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18
Q

the armature in a generator i)

A

rotates

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19
Q

what are the advantages of an alternator

A

lighter rotating assembly

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20
Q

What is the key difference between AC generators and AC brushless generators?

A

AC brushless generators have no slip rings or brushes

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21
Q

AC brushless generators have a lower i) compared to AC generators

A

maintenance cost

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22
Q

AC brushless generators is more i) and ii) compared to AC generators

A

stable and consistent

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23
Q

AC brushless generators have i) at high altitudes, eliminating ii)

A

better performance, arcing

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24
Q

The DC exciter in a AC brushless generator receives i) from ii)

A

DC field, voltage regulator

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25
Q

The AC exciter in a AC brushless generator generates i) for ii)

A

power, main generator field

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26
Q

The Rotating Rectifier assembly(rotor) in a AC brushless generator rotates with i) and converts ii) to iii)

A

rotor shaft, AC Exciter output, DC

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27
Q

The Main generator (AC output stator) in a AC brushless generator supply i) to ii). Its iii) is connected to a iv)

A

AC output, load, output, voltage regulator

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28
Q

Line voltage in a Star connected system =

A

√3 Vphase

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29
Q

Line current in a Star connected system =

A

Iphase

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30
Q

Line voltage in a Delta connected system =

A

Vphase

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31
Q

Line current in a Delta connected system =

A

√3 Iphase

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32
Q

(Z) represents

A

Impedance

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33
Q

(L) represents

A

Inductance

34
Q

(C) represents

A

Capacitance

35
Q

(XL) represents

A

Inductive Reactance

36
Q

(XC) represents

A

Capacitive Reactance

37
Q

Formula for impedance

A

Z = R + XL + XC

38
Q

Formula for inductive reactance

A

insert image

39
Q

Formula for capacitive reactance

A

insert image

40
Q

impedance of each phase is i) in balanced loads

A

equal

41
Q

impedance of each phase is i) in unbalanced loads

A

not equal

42
Q

the current flowing through the neutral wire in balanced loads = i) Amps

A

zero

43
Q

true or real power is measured in i)

A

watts (W)

44
Q

true or real power is consumed by i)

A

resistive loads

45
Q

true or real power is denoted by i)

A

P

46
Q

reactive power is measured in i)

A

volt-amps (VA)

47
Q

reactive power is consumed by i)

A

inductive or capacitive loads

48
Q

reactive power is denoted by i)

A

Q

49
Q

apparent power is measured in i)

A

volt-amps-reactive(VAR)

50
Q

apparent power is consumed by i)

A

by entire circuit

51
Q

apparent power is denoted by i)

A

S

52
Q

Power factor (PF) is the ratio of i) to ii)

A

true power, apparent power

53
Q

power factor is the measure of i) and is ideally ii)

A

the circuit’s efficiency, 1

54
Q

AC motors takes in i) as input and produces ii)

A

electrical energy, mechanical energy/work

55
Q

AC motors are not 100% efficient because

A

encounter power losses in motor windings, losing electric energy in form of heat energy

56
Q

generator produces i)

A

electrical energy

57
Q

motor produces i)

A

mechanical energy/work

58
Q

in synchronous motors, comment on the speed differences or similarities

A

speed of rotor is equal to speed of magnetic field

59
Q

in asynchronous motors, comment on the speed differences or similarities

A

speed of rotor is not equal to speed of magnetic field

60
Q

single phase synchronous motor is similar to i)

A

alternator with rotating field

61
Q

single phase synchronous motor can be used as a i) or ii)

A

generator or motor

62
Q

if a single phase synchronous motor were to be used as a motor, its i) must be constant to ensure ii) is also constant

A

input power frequency, motor speed

63
Q

if a single phase synchronous motor were to be used as a generator, its i) must be constant to ensure ii) is also constant

A

speed, output frequency

64
Q

in a three phase synchronous motor, its rotor winding is energized with i) and acts like a ii)

A

DC power, bar magnet

65
Q

in a three phase synchronous motor, its rotor winding i) with the ii)

A

rotates, rotating field at the stator

66
Q

in a three phase synchronous motor, its rotor runs at i) as the rotating magnetic field and thus is said to be ii)

A

the same speed, synchronous

67
Q

in induction motors, the i) interacts with the ii) , creating a iii)

A

rotor flux, rotating flux, mechanical force

68
Q

in induction motors, the mechanical force produced by the interaction between the rotor flux and the rotating flux causes i)

A

the rotor to rotate in the same direction as the rotating magnetic field

69
Q

in three-phase induction motors, the i) cuts the ii). This induces iii) in the rotor conductors causing iv), producing a v)

A

rotating stator magnetic field, stationary rotor conductors, voltage, currents to flow in the short circuited rotor bars, a rotor flux

70
Q

in three phase induction motors, why must the rotor run at a slightly lower speed than the rotating magnetic field

A

if speed is equal, will be no flux cut. Hence no voltage induced in rotor conductor, resultant current and torque developed = 0

71
Q

Why large induction motors are started with reduced current?

A

high current can cause momentary dip in voltage, affecting other equipment connected to same power supply

72
Q

single phase induction motors are more advantageuous because it is i), ii) and iii)

A

small, less expensive, does not require a 3 phase power supply

73
Q

single phase induction motors isnt able to i) and requires a ii)

A

self start, self starting scheme

74
Q

why are single phase induction motors less efficient compared to 2 or 3 phase motors

A

it has a pulsating field, thus has pulsating torque which is less efficient to 2 or 3 phase motors where the torque is more uniform

75
Q

A balanced, star connected 3 phase synchronous motor drew a 10A line current. The same motor will draw i) line current when it is delta-connected

A

(3*10) A

76
Q

Three phase induction motors can also be known as

A

a squirrel cage induction motor

77
Q

Shaded pole induction motors are a i)

A

type of single phase AC motor

78
Q

If the line currents of a 3 phase circuit are not spaced 120deg apart, it is because

A

the loads are not balanced

79
Q

A 3-phase, balanced, star connected heater load is connected to a RYB sequenced, 200VAC/400hz star connected supply. VBN =

A

200 ∠ -240° VAC

80
Q

when the reactive power of a 3-phase AC machine is reduced while the real power is maintained, the i)

A

apparent power will tend towards real power

81
Q

RYB Sequence is

A

positive

82
Q

RBY Sequence is

A

negative

AEIS (6 decks)

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