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WorksheetsPPL Air Tech - Electrical System
Total questions: 34
Worksheet time: 23mins
A modern light aircraft has a ____ electrical system.
B.B.C
D.C
B.B.S
A.C
Electrical power is produced by the _____ when the engine is running and by the _____ when it is not running
alternator, generator
generator, alternator
battery, alternator
alternator, battery
Current runs through wires and the _______ to the unit that needs the power. Afterwards it runs to _______ through a _______.
starter motor, alternator, battery
bus bar, ground, ground wire
ground wire, the bus bar, battery
generator, battery, ground wire
What can the aircraft's battery as be known as?
alternator
generator
accumulator
bus bar
What is the length of time a battery can last based off?
ampere-hours
amp rating
voltage
resistance-hours
A battery with an ampere hour rating of 600 will last how long when running 10 amps an hour?
10 hours
16 hours
60 hours
160 hours
A Nicad battery is smaller, lighter and more efficient than a lead-acid battery.
true
false
Which statement is incorrect?
A lead acid battery generally has multiple cells of 2.1V each
A nicad battery may explode if allowed to overheat
A lead acid battery is not rechargeable
The charge rate of the battery should be monitored to avoid overheating
What is the purpose of the aircraft accumulator? Choose all that apply
To store back up emergency electricity
To provide an initial electrical power source for the starter motor
To provide a continuous supply of electricity to the magnetos
To continue to charge to the alternator throughout flight
What is the alternator run off?
The battery
The camshaft
The engine
The magnetos
What is a GPU?
ground proximity unit
general power undercarriage
ground production undercarriage
ground power unit
What is the purpose of the GPU?
to stop the alternator overcharging the battery in flight
to aid with starting aircraft if battery is flat or capacity is too low
to conduct and distribute power around the electrical units
to measure the current flowing in the circuit
An alternator produces _____ and generator produces ______
A.C, D.C
D.C, A.C
A.C, A.C
D.C, D.C
What does an inverter do?
changes A.C to D.C
changes D.C to A.C
steps A.C at one voltage up or down to another voltage
steps D.C at one voltage up or down to another voltage
What does a rectifier do?
changes A.C to D.C
changes D.C to A.C
steps A.C at one voltage up or down to another voltage
steps D.C at one voltage up or down to another voltage
What does a transformer do?
changes A.C to D.C
changes D.C to A.C
steps A.C at one voltage up or down to another voltage
steps D.C at one voltage up or down to another voltage
The alternator does not require a charged battery to start generating electricity.
true
false
A generator is produced with a commutator to automatically produce ____
DC
AC
What are disadvantages of the generator over an alternator?
It is heavier
It requires a rectifier to convert AC to DC
It is larger
It produces less current per rpm
What is the purpose of the bus bar?
to stop the alternator overcharging the battery in flight
to aid with starting aircraft if battery is flat or capacity is too low
to conduct and distribute power around the electrical units
to measure the current flowing in the circuit
What is the purpose of over voltage protection?
to prevent the battery from over heating and exploding
to prevent the battery from over cooling and exploding
to prevent the circuit breakers from popping
to prevent the alternator from over revving
What does an ammeter measure?
joules
volts
ohms
amps
What does a left-zero ammeter measure?
the charge into and out of the battery
the output of the battery
the output of the alternator
the charge into and out of the alternator
As more electrical services are switched on a left zero ammeter will move ....
left
right
stay on centre zero
stay on left zero
With the battery on but engine not running the left zero ammeter will move .....
left of centre
right
stay on centre zero
stay on left zero
What does a centre-zero ammeter measure?
the charge into and out of the battery
the output of the battery
the output of the alternator
the input into the battery
With the battery on but engine not running the centre zero ammeter will move .....
left of centre
right of centre
stay on centre zero
stay on left zero
After starting the engine the centre zero ammeter will move .....
left of centre
right of centre
stay on centre zero
stay on left zero
A fuse will _____ and a circuit breaker will _____ if there is a current overload
melt, pop
pop, melt
ignite, melt
pop, ignite
The radio should be left off for starting for what reason? Choose all that apply
the power can surge during start damaging the radio
the radio can produce a surge damaging the starter motor
the radio will cause electromagnetic flux to damage the magentos
the battery may be drained too much to start
Insufficient current from the alternator to the battery would be indicated by what on the center zero ammeter?
needle to the far left of zero
needle to the far right of zero
needle on centre zero
needle on left zero
What should you do if you notice insufficient charge to the battery?
pop the circuit breakers for all unnecessary equipment
turn on all lights to ensure you are visible to other aircraft
turn off unnecessary equipment to conserve the battery
turn the battery off then on again
What should you do if you notice excessive charge to the battery?
turn the battery off and on
turn unnecessary equipment off
pop the radio circuit breaker
land as soon as possible
How many times can you reset a circuit breaker?
0
1
2
3
