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Module 11 Sub Modules 11.1 - 11.10 > 11.6 > Flashcards

11.6 Flashcards

1
Q

what are the electrical voltages mainly used on an aircraft?

A

28vdc
115/200 VAC 400Hz
Batt 24 VDC

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2
Q

what does the electrical power system consist of?

A

Generation subsystem
Distribution subsystem

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3
Q

what is used to convert AC to DC from the IDG?

A

transformer rectifier unit

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4
Q

what are some electrical sources on an aircraft?

A

IDG
APU
RAT
GPU

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5
Q

what are aircraft batteries used for?

A

emergency power
APU starter motor power

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6
Q

when are the batteries charged?

A

during normal operation of the electrical power system

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7
Q

how is dc converted to ac?

A

a static inverter

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8
Q

what is the dc power source in flight?

A

IDG (this is AC)

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9
Q

why are the batteries semi-sealed (vented)?

A

to allow gases to escape but prevent spillage of the electrolyte

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10
Q

are secondary cells rechargeable?

A

yes

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11
Q

in an emergency how long should the battery supply power for?

A

30 mins

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12
Q

where are batteries vented to?

A

overboard/outside non return valve to prevent reverse flow

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13
Q

what is the purpose of a battery tray?

A

catch split electrolyte

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14
Q

what are the two types of batteries on auto pilot?

A

ni-cad
lead acid

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15
Q

what voltage are individual cells:
during charging?
during discharge?

A

charging - 1.5v
discharging - 1.0v when fully discharged

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16
Q

what should battery checks consist of?

A

storage capability
electrolyte condition

17
Q

how is the change level checked in a Ni-cad battery?

A

only possible by monitoring the voltage and current during charging

18
Q

what batteries are highly susceptible to thermal runaway?

A

Ni-cad

19
Q

what are the charging methods?

A

constant voltage
constant current

20
Q

what type of battery uses constant current charging?

A

Ni-cad

21
Q

what are batteries monitored for?

A

their temperature

22
Q

when is the hot battery bus connected to the battery?

A

always

23
Q

where would electrical info be displayed?

A

ECAM/EICAS

24
Q

when removing and installing a battery what order are loads removed/installed?

A

Removal
neg first
install
neg last

25
Q

what are some advantages of lithium over NI-cad?

A

high v and i production
improved power quality
recharge quick
30% lighter
compact
no memory degradation

26
Q

a dc generator is required to supply a constant voltage within set limits under what conditions?

A

full range of engine speeds
no loads up to full load
share load with over gens

27
Q

what is shown on the generator identity plate?

A

rotation direction

28
Q

what is the purpose of the equalising coils?

A

equalise outputs from the IDG in parallel systems

29
Q
A

Module 11 Sub Modules 11.1 - 11.10 (82 decks)

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