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AEIS > AEIS CHAPTER 2 > Flashcards

AEIS CHAPTER 2 Flashcards

1
Q

What is a generator

A

electromagnetic device that converts mechanical energy to electrical energy by electromagnetic induction

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2
Q

how are DC batteries used in aircrafts

A

used for emergency/standby purposes only

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3
Q

an aircraft dc generator is the i) of power and is also used to maintain the ii)

A

main source, aircraft battery at its fully charged condition

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4
Q

Aircraft DC generator is used for

A

normal operation

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5
Q

i) of armature affects the voltage produced by a generator

A

speed

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6
Q

i) of ii) field affects the voltage produced by a generator

A

strength, magnetic

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7
Q

number if i) affects the voltage produced by a generator

A

conductors connected in series with the armature

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8
Q

DC generator is made up of a i) and ii)

A

stator, rotor(shaft)

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9
Q

the stator in a DC generator is i)

A

stationary

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10
Q

the rotor(shaft) in a DC generator is i)

A

moving/turning

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11
Q

the magnetic frame(yoke) in the stator provides i) for the poles

A

mechanical support

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12
Q

the magnetic frame(yoke) in the stator acts i) for the machine

A

protecting cover

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13
Q

the magnetic frame(yoke) in the stator provides i) for flux produced

A

a path

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14
Q

the poles in the stator is made of i)

A

silicon steel plates (laminations) riveted together

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15
Q

the poles in the stator provides a i) for the magnetic flux

A

low resistance path

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16
Q

the poles in the stator provides i) for the field coils

A

support

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17
Q

the field coils in the stator produces i)

A

magnetic flux

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18
Q

the brushes and bearings in the stator is made of i)

A

carbon and copper alloy

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19
Q

the brushes and bearings collect i) from the ii) and delivers it to the iii)

A

current, commutator segments, external load circuit

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20
Q

the armature core in the rotor consists of i)

A

steel laminations insulated from each other

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21
Q

the armature core in the rotor provides a i) for the magnetic flux

A

low reluctance path

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22
Q

the armature windings in the rotor generates i) if the machines is a generator

A

EMF

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23
Q

the armature windings in the rotor allows the i) and develops a ii) if the machine is a motor

A

flow of current, force

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24
Q

the commutator in the rotor facilitates the i) from the ii)

A

collection of current, armature conductors

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25
Q

the commutator in the rotor rectifies the i) to ii) in the external load circuit

A

AC current to DC current

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26
Q

a series DC generator is a i) generator in which the field winding is in ii) with the armature winding

A

self-excited, series

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27
Q

a shunt DC generator is a i) generator in which the field winding is in ii) with the armature winding

A

self-excited, parallel

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28
Q

a compound DC generator is a i) generator in which the field winding is a ii)

A

self-excited, combination of series and shunt wound generators

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29
Q

a seperately-excited DC generator is a i) generator in which the field winding and armature are

A

seperately-excited, seperated

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30
Q

the two methods of winding the armature conductors are

A

wave winding and lap winding

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31
Q

wave winding is also known as i)

A

2 circuit winding/series winding

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32
Q

lap winding is also known as i)

A

multiple circuit winding/parallel winding

33
Q

in wave winding, the windings i) overlap

A

do not

34
Q

in lap winding, the windings i) overlap

A

do

35
Q

in wave winding, the number of parallel paths is i) regardless of ii)

A

two, number of poles

36
Q

in lap winding, the number of parallel paths is i) the number of poles

A

the same as

37
Q

series windings produce i)

A

high voltage, low current generators

38
Q

wave windings produce i)

A

high current, low voltage generators

39
Q

in wave windings, each path supplies i)

A

the total current output

40
Q

in wave windings, i) are neccesary

A

2 sets of brushes

41
Q

in lap winding, the total current output divides i)

A

equally among the paths

42
Q

in lap winding, there are as many i)

A

sets of brushes as the machine has poles\

43
Q

formula for the EMF generated for a Wave-wound armature

A

insert image

44
Q

formula for the EMF generated for a Lap-wound armature

A

insert image

45
Q

voltage regulators is used to control i)

A

the strength of the field

46
Q

voltage regulators is used to maintain a i) from the generator under ii)

A

a constant voltage, all conditions of speed and load

47
Q

the three types of voltage regulators are

A

carbon-pile voltage regulator, variable resistor voltage regulator, solid-state voltage regulator

48
Q

the reverse-current cut out relay prevents the i) when ii), preventing the iii)

A

battery from discharging through the generator, Vgen < Vbatt, armature from burning

49
Q

the current limiter protects i)

A

the generator from excessive loads

50
Q

what is a GCU

A

Generator Control Unit

51
Q

a GCU consists of i), ii) and iii) from left to right according to the circuitry

A

Voltage regulator, current limited, reverse-current cut out relay

52
Q

what are the basic equipment to monitor DC power onboard aircraft

A

ammeter and voltmeter

53
Q

when designing aircraft electrical power distribution system, power consuming equipment must not be i) in the event of ii) unless iii)

A

deprived of power, power source failures, total power demand exceeds available supply

54
Q

when designing aircraft electrical power distribution system, i) on the distribution system must have a ii)

A

faults, minimum effect on system

55
Q

when designing aircraft electrical power distribution system, i) faults must not ii) to other equipment

A

power consuming equipment, endanger the supply of power

56
Q

one of the advantages of paralleling genrators is that there will be i) if a generator fails

A

no break in supply

57
Q

one of the advantages of paralleling genrators is that the system can handle i) and ii) to improve iii)

A

high transient loads, share the loads equally, life expectancy

58
Q

one of the disadvantages of paralleling generators is that it requires i) and ii)

A

additional circuitry, it complicates the system

59
Q

the Hot battery bus is for i) and is connected ii)

A

vital / critical services, directly to the battery

60
Q

the main bus is for i) and can be supplied from ii)

A

essential services, from a generator or batteries

61
Q

the avionics bus is for i) and is supplied from a ii)

A

non essential services, generator

62
Q

DC motors have i) arrangements unlike AC motors

A

commutator

63
Q

DC motors do not depend on i) for speed control and are more suited for ii)

A

input frequency, fast-changing speed applications

64
Q

DC Generator turns the i) to outpur ii)

A

armature, DC voltage

65
Q

DC Motor inputs i), making the ii) and outputs iii)

A

DC power, armature rotate, torque

66
Q

In a series wound motor, the field windings and armature are i)

A

connected in series

67
Q

a series wound motor has a high i) and good ii)

A

starting torque, acceleration

68
Q

a series wound motor can never run i)

A

without a load

69
Q

a series wound motor can be started on a i)

A

full load

70
Q

In a shunt wound motor, the field windings and armature are i)

A

connected in parallel

71
Q

a shunt wound motor has a i) characteristic

A

constant-speed

72
Q

in a shunt wound motor, the i) is proportional to ii)

A

torque proportional to armature current

73
Q

a shunt wound motor must be started on a i) or ii)

A

light, no load

74
Q

a compound wound motor has i) and i) in speed

A

good starting torque, good stability

75
Q

a compount wound motor provides the benefits of i)

A

series and shunt wound motors

76
Q

a starter generator initially operates as a i) to ii). subsequently, it will start to act as a iii)

A

DC motor, crank the engine, generator

77
Q

using a starter generator helps to save i) by replacing individual members

A

size and weight

78
Q

one disadvantage of using a starter generator is that the generator output is i) to maintain at ii)

A

difficult, low engine rpm

79
Q

starter generators are usually used on i) aircraft that maintains a ii)

A

turbine powered, relatively high engine rpm

AEIS (6 decks)

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