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M11 > 11.6 > Flashcards

11.6 Flashcards

1
Q

How many IDGs are on each engine to generate AC current ?

A

1 per engine

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2
Q

Whats used to turn AC into DC. ?

A

TRU

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3
Q

What turns DC into AC ?

A

Static inverter

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4
Q

What does an electrical power system consist of ?

A

-Generator which produces electrical energy

-Distribution subsystems providing electrical energy to consumers

(These are both slept into AC and DC )

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5
Q

What supplies emergency supply to the essential consumers in an emergency ?

A

Essential bus

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6
Q

Whats the use of a battery tray ?

A

To catch any corrosive electrolytes split from battery

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7
Q

Whats thermal runaway ?

A

When the battery produces more heat then it is dissipating.

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8
Q

How often does a battery have to be serviced ?

A

Every 2000 flight hours

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9
Q

What will a battery cell rise to during charging ?

A

1.5v

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10
Q

What will a battery cell drop to when it’s discharged ?

A

1.0v

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11
Q

What battery is constant current method usually used on ?

A

Ni-Cd

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12
Q

If battery’s are in parallel, does the current or voltage output go up ?

A

Current

( battery’s in series gives greater voltage output )

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13
Q

What does the battery master switch connect when turned on ?

A

Both battery’s to Essential bus bars

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14
Q

What does the main battery switch connect when turned on

A

MAIN battery to MAIN bus No.1

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15
Q

When disconnecting battery, do you remove negative or positive lead first ?

A

Negative

( when re-applying you connect negative last )

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16
Q

What battery is use do 787 ?

A

Lithium-ion battery

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17
Q

How many cells are in a lithium-ion battery ?

A

8 cells

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18
Q

Whats the advantages of lithium-ion battery’s over Ni-Cd ?

A

-Improved power quality
-recharges quick
-weight 30% less
-no memory degradation
-compact

19
Q

What is a DC starter generator used for ?

A

Start engines

20
Q

Whats load shedding ?

A

Reduce the electrical load to a acceptable level in the event of a system overload

21
Q

How many phases does a AC electrical power system consist of ?

A

3 phase
( 400HZ )

22
Q

Where do you get 200v from on the 3 phase AC electrical system ?

A

Between each phase
( get 115v between a phase and neutral )

23
Q

How do you control the AC generators output ?

A

CPU

24
Q

Is the speed of the generators output proportional to speed of rotor ?

A

Yes

25
Q

Whats used to ensure that there is a constant output speed out of the generator ?

A

Constant speed drive

26
Q

Where is the constant speed drive fitted ?

A

On engine with the generator

27
Q

Whats the purpose for an oil circuit ?

A

To cool and lubricate the CSDU (constant speed drive unit )

28
Q

Whats the two ways the CSD ( constant speed drive ) is monitored ?

A

Circuits alerting the crew automatically

Indications displayed on the ECAM

29
Q

When do you reset the CSD only ?

A

On the GROUND

30
Q

What is the IDG speed ?

A

12,000 RPM

31
Q

What does the GCU control ?

A

Varys the voltage and frequency of the CSGU

32
Q

Whats the three basic forms of AC generation systems ?

A

Non - parallel
Parallel
Frequency wild

33
Q

What does a current transformer do ?

A

Allows you to read a circuits current without breaking the system.

( has three pick coils which picks up magnetic fields )

34
Q

How many degrees apart are the three phases on a AC system ?

A

120 degrees

35
Q

Whats used to regulate the voltage ?

A

GCU

36
Q

Whats the purpose of a busbar ?

A

Distribute electrical power

37
Q

Whats a transformer used for ?

A

Transform voltages up or down

38
Q

Whats the two circuit protective devices ?

A

Fuses

Circuit breakers

39
Q

What are fuses and circuit breakers used to prevent ?

A

Current that flow higher than the maximum allowed ( overload ) or a short circuit

40
Q

What is used to check a fuse to ensure it hasn’t blown ?

A

Multimeter

41
Q

How many times can you reset a circuit breaker ?

A

Once

42
Q

How do you know a circuit breaker is tripped ?

A

White collar will show

43
Q

Explain a virtual circuit breakers ?

A

Monitored on a computer

44
Q

How many pins does a DC gpu connector have ?

A

3

M11 (22 decks)

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