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xxxAEIS > Aircraft Batteries > Flashcards

Aircraft Batteries Flashcards

1
Q

what is a battery

A

device that converts chemical energy to electrical energy

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2
Q

typical voltages for dry, lead-acid, nickel-cadmium cells

A

dry cell: 1.5 VDC
lead-acid cell: 2.1 VDC
nickel-cadmium cell: 1.2 VDC

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3
Q

hierarchy of on-board power

A

battery + inverter
RAT Gen
APU
Generator

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4
Q

lead-acid batteries specific gravity when fully discharged

A

1.18

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5
Q

electrolytes used in lead-acid & nickel cadmium batteries

A

lead-acid: H2SO4

nickel-cadmium: KOH

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6
Q

types of battery tests and checks

A 
high-rate discharge test
capacity check
cell leakage test
insulation test
hydrometer test
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7
Q

what does a hydrometer test do and determines?

A

measures the specific gravity of liquid wrt density of water

determines the specific gravity of electrolyte

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8
Q

temperature inverse or directly proportional to specific gravity

A

inversely proportional

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9
Q

battery vicious cycle

A

increased heat > reduced resistance > increased current > increased heat

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10
Q

how to remove & install battery

A

remove negative lead first, install black lead last

BIL (black in last)

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11
Q

lead acid vs nickel cadmium batteries

A

lead acid:
higher terminal voltage
lighter, smaller, cheaper

nickel cadmium batteries:
higher life expectancy
can withstand overcharging
higher working temperature

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12
Q

2 battery charging methods

A

constant current, constant voltage

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13
Q

difference between constant current and constant voltage charging

A

constant current is in series, constant voltage is in parallel

constant current: longer time to charge and dangers of overcharging
constant voltage: less time and supervision but leads to cell imbalance

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14
Q

lead acid battery VDC when fully charged & discharged

A

fully charged: 2.2V

fully discharged: 1.8V

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15
Q

connecting batteries in parallel/series will increase which factor?

A

parallel - increase Ah capacity, more amps

series - increase total voltage

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16
Q

photocell vs fuel cell

A

photocell converts light into electricity

fuel cell converts potential energy from a fuel into electricity

17
Q

specific gravity of fully charged lead-acid battery

A

1.275 - 1.3

18
Q

factors determining span of useful life of battery

A

construction and design
conditions under which it operates
servicing it receives

18
Q

types of servicing on batteries

A

initial servicing

routine servicing

quarterly servicing

19
Q

what causes thermal runaway and what will it cause

A

thermal runaway happens when temperature conditions and charging rates exceeds a certain value

causes:
violent gassing
boiling of electrolytes
melting of plates and casing

xxxAEIS (9 decks)

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