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?

19
Q

what are the charging methods?

A

constant voltage
constant current

20
Q

what type of battery uses constant current charging?

21
Q

what are batteries monitored for?

A

their temperature

22
Q

when is the hot battery bus connected to the battery?

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
what are some advantages of lithium over NI-cad?
high v and i production improved power quality recharge quick 30% lighter compact no memory degradation
26
a dc generator is required to supply a constant voltage within set limits under what conditions?
full range of engine speeds no loads up to full load share load with over gens
27
what is shown on the generator identity plate?
rotation direction
28
what is the purpose of the equalising coils?
equalise outputs from the IDG in parallel systems
29