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M11 > 11.6 Electrical Power > Flashcards

11.6 Electrical Power Flashcards

1
Q

How do you convert DC to AC?

A

static inverter

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2
Q

What is the voltage of a battery?

A

24v

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3
Q

What is a battery used for?

A

emergencies & APU start

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4
Q

What is the minimum time a battery can last for?

A

30 mins

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5
Q

What is thermal runaway?

A

when more heat is produced in a battery than the surroundings

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6
Q

What is the voltage of a battery cell?

A

1.2v

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7
Q

What is the voltage of a battery cell during charging?

A

1.5v

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8
Q

What is the voltage of a battery cell during discharge?

A

1v

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9
Q

How often must a battery get sent to the workshop for checks?

A

Every 2000 operating hours

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10
Q

What type of battery is prone to thermal runaway?

A

Nickel cadmium

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11
Q

What voltage must you not discharge a battery below?

A

22v

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12
Q

How do you convert AC to DC?

A

TRU’s

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13
Q

If a battery is in series what increases?

A

voltage

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14
Q

If a battery is in parallel what increases?

A

current

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15
Q

What are the 3 stages a lithium battery is charged in and what stage is not required if done before?

A

constant current, balance, voltage source - balance

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16
Q

What are the 2 methods of charging batteries & which method is used for each battery?

A

Constant voltage method - lead-acid batteries & Constant current method - Ni-cad batteries

17
Q

What is labelled on a DC generator?

A

direction of rotation

18
Q

What is the voltage between phases on AC?

A

200v

19
Q

What is the frequency of a 3 phase AC system?

A

400Hz

20
Q

What is the voltage from neutral in a 3 phase AC system

A

115/200v

21
Q

What is the function of a GCU?

A

controls over/under drive & frequency

22
Q

What is the function of an oil circuit & what happens if it goes into straight drive?

A

cooling - risks overheating

23
Q

How many inductive pickup coils does a current transformer (CT) have and what is the function?

A

3 - current sensing

24
Q

What is the function of circuit protection?

A

Prevent currents that are higher than the max allowed cross-section of the wire

25
Q

What is used for circuit protection & what is the main difference?

A

fuses & circuit breakers - a CB can be reset

26
Q

What is a fuse checker device known as?

A

multimeter

27
Q

How many resets must you perform on a CB?

A

1

28
Q

What indicates that a thermal CB has been tripped?

A

white band

29
Q

How many pins does a DC ground connector have & which are + & -?

A

3, 2+ & 1-

30
Q

How many pins does a AC ground connector have & which are neutral/phased & DC?

A

6, 4 neutral/phased & 2 DC

31
Q

Why are the 2 DC pins on an AC ground connector smaller?

A

prevent arcing

32
Q

What supplies DC power during flight?

A

EDG

M11 (11 decks)

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