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Module 11B > 11.6 - Electrical Power - 8q > Flashcards

11.6 - Electrical Power - 8q Flashcards

1
Q

What causes The Generator breaker (GB) to trip?

A
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2
Q

What does the BPCU do?

A
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3
Q

What does the CCTA do?

A
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4
Q

What does the DPCTA do?

A
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5
Q

Unbalanced load detected by the CCTA? (2)

A
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6
Q

GCU senses what? What trips and if fault persists what happens?

A

.

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7
Q

IDG GCR trips, what happens?

A
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8
Q

What does the GCU do?

A
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9
Q

The GCU controls, protects and regulates AC gen output but where is Regulation done?

A
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10
Q

Unused Auto Tran terminals are in what config?

A
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11
Q

Over voltage trip = ?
Under voltage trip = ?

A
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12
Q

The Static inverter is fed by what?

A
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13
Q

Inverter feeds what bus’ (3)?

A
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14
Q

When is the RAT dropped in terms of buses?

A
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15
Q

External Power, what power is on the small pin and what is it connected to?

A
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16
Q

How long should the battery supply power for?

A
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17
Q

3 Phase supply = ? diodes

A
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18
Q

If the CSD is disconnected, how is it reconnected?

A
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19
Q

CSD used in parallel have a what?

A
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20
Q

CSD controls what?

A
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21
Q

Voltage regulator does what?

A
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22
Q

Real load sharing vs reactive load sharing

A
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23
Q

Lead Acid Battery
* Electrolyte?
* Cell Voltage? (Normal & Fully charged)
* SG of electrolyte always constant?
* SG what value?
* Service the battery?
* What to neutralise with if spilled?
* Type of charging?

A
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24
Q

What electrolyte is used in a lead acid battery?

A
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25
Q

What is the Cell voltage of a lead acid battery?

A
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26
Q

What would you do if spill a lead acid battery?

A
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27
Q

What type of charging is used for a lead acid battery?

A
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28
Q

Ni-Cad Battery
* Electrolyte?
* Cell voltage? (Normal vs Fully charged)
* SG value?
* If spilled, neutralised with?
* Advantages? (2)

A
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29
Q

What electrolyte is used in a Ni-Cad battery?

A
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30
Q

What is the cell voltage of a Ni-Cad battery?

A
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31
Q

Ni-Cad battery spillage, how neutralised?

A
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32
Q

Zener diode and transistors do what?

A
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33
Q
A
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34
Q

Current Transformer measures what and can’t be left in what config

A
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35
Q
A

1.8 V

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36
Q
A

amount of material available for chemical reaction

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37
Q
A

1.25V

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38
Q
A

Potassium hydroxide

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39
Q
A

primary cell

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40
Q

The electrolyte in a Lead-Acid cell would be:
a) Ammonium chloride
b) Potassium hydroxide
c) Sulphuric acid

A

c) Sulphuric acid

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41
Q
A

1.3 - 1.4

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42
Q
A

ampere-hours

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43
Q
A

1.28

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44
Q
A

1.115

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45
Q
A

Hydrometer

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46
Q
A

12

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47
Q
A

ten hours

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48
Q
A

Ambient temperature

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49
Q
A

20

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50
Q
A

15 degrees centrigrade

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51
Q
A

59 degrees Fahrenheit

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52
Q
A

Be increased

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53
Q
A

Be decreased

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54
Q
A

12

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55
Q
A

By completely discharging it in a controlled manner and recording the result

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56
Q
A

200 AHr

57
Q
A

95% efficient

58
Q
A

At least 80-90% of the nominal capacity

59
Q
A

We allow the battery a set time after charging, before testing

60
Q

If a cell fails a cell balance test:
a) we replace it
b) we charge it up separately and re-install it
c) we discharge the entire battery and recharge it to restore balance

A

a) we replace it ( can only replace 5 cells)

61
Q
A

A megohmeter or ammeter

62
Q
A

250V

63
Q
A

c) when fully charged, and the volume of electrolyte is low

64
Q
A

50V

65
Q
A

Pump air into the cell until the valve operates

66
Q
A

voltage

67
Q
A

2-10 psi

68
Q
A

For NiCad batteries only

69
Q
A

For NiCad batteries only

70
Q
A

The shutdown of the battery charger

71
Q
A

Overboard

72
Q
A

The negative terminal

73
Q
A

The Cathode

74
Q
A

Can be used for either type of battery

75
Q
A

Should be used for Lead-Acid batteries only

76
Q
A

Can aggravate cell imbalance problems in NiCad batteries

77
Q
A

Reduced the potential for excessive gassing

78
Q
A

Decrease as the level of battery charge increases

79
Q
A

excessive charging current

80
Q
A

Reduced the potential for excessive gassing

81
Q
A

Will normally disconnect itself during an engine or APU startup

82
Q
A

Could use either of the abovev to ensure battery capacity is maintained

83
Q
A

Bicarbonate of soda

84
Q
A

Vinegar

85
Q
A

Boric acid

86
Q
A

measured discharge in the workshop

87
Q
A

Acetic Acid

88
Q
A

Can be tested on board the aircraft

89
Q
A

replacing

90
Q
A

No effect

91
Q
A

The temperature

92
Q
A

after charge

93
Q
A

normal operation

94
Q
A

acid is always added to the water

95
Q
A

high charge current

96
Q
A

You replace the cell

97
Q
A

Once charged

98
Q
A

must not be used for nickel-cadmium batteries

99
Q

An ammeter in a battery charging system is for the purpose of indicating the
a) amperage available for use
b) total amperes being used in the airplane
c) rate of current used to charge the battery

A
100
Q
A

Constant current charging of the battery to more than 100 percent of its capacity

101
Q
A

resistance of the generator field current

102
Q
A

turboprop aircraft

103
Q

To what depth is the mica insulation between the commutator segments of a d.c generator undercut
a) approximately 0.02 in.
b) one-half the width of the mica
c) approximately 0.25 in

A

b) one-half the width of the mica
(0.002 in)

104
Q
A

The aircraft generator continues to rotate after the engine is shut down

105
Q
A

Generator contactor

106
Q
A

interpoles

107
Q
A

strength of the magnetic field

108
Q
A

field assembly

109
Q
A

place armature in a growler and connect a 110V test light on adjacent segments; light should light

110
Q
A

One-half the width of the mica

111
Q
A

varying current flow to generator field coil

112
Q
A

Series wound

113
Q
A

an integral fan

114
Q
A

flash the field

115
Q
A

reduce eddy current losses

116
Q
A

b) To provide noise suppression at the output

117
Q
A

it opens the main generator circuit whenever the generator voltage drops below the battery voltage

118
Q
A

the generator taken off the aircraft and bedding done on the bench

119
Q
A

Smooth out ‘‘commutator ripple’’

120
Q
A

low spring tension

121
Q
A

Generator operates normally but the ammeter reads zero

122
Q
A

Undervolts relay closes before the differential relay

123
Q
A

low spring tension

124
Q
A

A low number of turns of low gage wire

Starter section - Series

125
Q
A

A high number of turns of high gage wire

generator section - Shunt/compound

126
Q
A

Series wound

127
Q
A

Shunt or compound wound

128
Q
A

A centrifugal switch

129
Q
A

a shorted armature

130
Q
A

reduce eddy current losses

131
Q
A

breaking a circuit to the trip coil of the field control relay

132
Q
A

increasing the output of the low generator and decreasing the output of the high generator until they are equal

133
Q
A

current flowing through the shunt field coils

134
Q
A

an out-of-adjustment voltage regulator

135
Q
A

Brush spring tension

136
Q
A

bus bar voltage and generator voltage

137
Q
A

generator at varying loads and speeds

138
Q
A

b) changes alternating current produced in the armature into direct current as it is taken from the armature

139
Q

Match each of the following:
Commutator
AC
Slip Rings
DC

A

Module 11B (42 decks)

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