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B1 M11 > 11.6 > Flashcards

11.6 Flashcards

1
Q

In a constant frequency AC system, reactive load sharing is achieved by regulating the

A

Voltage regulator

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2
Q

In a constant frequency AC system, real load sharing is achieved by regulating the

A

Generator drive torque

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3
Q

What happens if frequency decreases without alternating the physical length of the aerial?

A

The aerial becomes capacitively reactive

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4
Q

What happens if frequency increases without alternating the physical length of aerial?

A

The aerial becomes inductively reactive

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5
Q

DC shunt generator without a voltage regulator, if the load increases the generator output voltage will?

A

Decrease

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6
Q

The output from an AC generator is taken from?

A

Connections on the stator

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7
Q

Differential sensing coil senses?

A

Current

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8
Q

What happens when you shut down the engine?

A

Under-frequency and under-volts

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9
Q

The winding embedded in the pole face of a DC generator are?

A

Compensating windings

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10
Q

How are Auxiliary windings wound on a DC generator?

A

Wound on top on the inter pole windings

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11
Q

A vibrating contact voltage regulator has?

A. A resister in series with the points
B. A resister in parallel with the points
C. A volts coil in parallel with the points

A

B. A resister in parallel with the points

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12
Q

A vibrating contact voltage regulator consists of a shunt winding and?

A

A voltage regulating coil in series

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13
Q

A vibrating type voltage regulator regulates field current by?

A

A resistor in parallel with a pair of contact breaker points

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14
Q

A voltage regulator installed in series with a generator field uses?

A

A voltage coil in parallel with the generator output

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15
Q

AC generator output indications are measured in?

A

KW & KVAR

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16
Q

An alkaline battery must have its electrolyte level adjusted when?

A

On completion of charge

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17
Q

A SG check on a battery should be carried out when?

A

3 hours after flight

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18
Q

Battery capacity is checked by?

A

Discharging at a constant current and checking the time taken to reach the discharged state

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19
Q

Galley loads are supplied from where?

A

The main bus bar

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20
Q

Increasing the real load primarily?

A

Decreases frequency

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21
Q

Lead acid batteries when removed from service must be stored?

A

Fully charged

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22
Q

Nickel cadmium batteries may be topped up with diluted or de-mineralised water when?

A

The battery is fully charged

23
Q

On a C.S driven generator, the operation of the disconnect solenoid will disconnect the generator drive, how is it reset?

A

Resetting can only be carried out on the ground

24
Q

On a split bus electrical system, during normal operation, the bus tie breakers are?

A

Always open in flight

25
Q

How is open phase sensing detected on a current transformer?

A

Detected on generator neutral circuit

26
Q

Over-voltage condition trips the generator. the time taken to trip the GCU depends on?

A

Amplitude of voltage

27
Q

Polarisation in a cell is?

A

The fact that hydrogen bubbles form on the -ve plate

28
Q

The current consumed by a DC starter motor will?

A

Decrease as the engine speed increases

29
Q

The electrolyte in a lead acid battery contains?

A

Sulphuric acid

30
Q

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

A

In a discharged condition

31
Q

The method used to rapidly charge a nickel-cadmium battery utilises?

A

Constant voltage and varying current

32
Q

The output from an AC generator is taken from?

A

Connections on the stator

33
Q

The preferred method of battery charging in a Ni-Cad battery is constant?

A

Current

34
Q

The purpose of a thermistor in a brushless AC generator is to?

A

Keep the exciter field resistance nearly constant at varying temperatures

35
Q

The SG of the electrolyte in a ni-cad battery on discharge?

A

Remains the same

36
Q

The small pins in the power connector plug are?

A

Positive

37
Q

The state of charge of a nickel cadmium battery. Can be accurately determined in a workshop by?

A

The time required to discharge

38
Q

To confirm the state of charge of a ni-cad battery?

A

Measure the discharge time

39
Q

To obtain DC from a generator, the armature windings are connected to?

A

A commutator

40
Q

To parallel an alternating current generator it’s one or more generators, phase A must be?

A

In phase with other generators and ABC

41
Q

To restore electrolyte after spillage?

A

Add a mixture of acid and water of same sg as that in the battery

42
Q

To restore the level of electrolyte which has been lost due to normal gassing during battery charging

A

Distilled water must be added

43
Q

Vibrating contact voltage regulator sensing coil is

A

in parallel with the field windings

44
Q

What would be the cause of a low electrolyte level in a in a nicad battery?

A

Over charging current

45
Q

When a ni-cad battery is fully charged?

A

The electrolyte level is higher level than normal

46
Q

When connecting aircraft batteries, the last lead to connect is the?

A

Negative

47
Q

Wires in hot temperature areas should be bound with?

A

Teflon

48
Q

Which generator has commutators?

A

DC

49
Q

Which generators have slip rings?

A

AC

50
Q

The trimmer resister in a carbon pile volts regulator is…..

A

In series with the generator volts coil

51
Q

The function of the voltage regulator in the GCU is to control the voltage at?

A

The point of regulation to 115v by influencing the exciter current

52
Q

When temperature of the electrolyte in a battery increases, the SG

A

Goes down

53
Q

When the temperature increases in a lead acid battery, the SG will?

A

Decrease

54
Q

Vibrating contact voltage regulator sensing coil is?

A

In parallel with the field windings

B1 M11 (22 decks)

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