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WorksheetsCPL Acft Tech - Electrical systems
Total questions: 15
Worksheet time: 8mins
Which of the following aircraft systems typically use DC power?
Select all that apply
generator
turn indicator
altimeter
nose wheel steering
The function of a bus bar in an electrical circuit is to...
distribute power to a number of circuits
provide over voltage protection
break the circuit in case of an electrical overload
generate power for a system
An alternator...
provides power for electrical systems in an aircraft
provides power only to the battery
provides power to the generator, which then powers the electrical systems
allows DC power to be inverted into AC power
If a battery is rated at 40 Ampere hours, that means that it can...
support any system for 40 hours
support a system drawing 40 Amps for a maximum of 40 hours
support a system drawing 4 Amps for a maximum of 10 hours
support a system drawing 40 Amps for a maximum of 24 hours
A disadvantage of an alternator compared to a generator is that it...
produces less current per revolution
is heavier and larger for the same amount of power produced
requires power initially before it can produce power
has fewer windings on the main stator coil and so is less efficient at producing power
A generator...
contains an electromagnet
produces AC which is rectified to DC by diodes
spins a coil of wire inside a magnet
contains a primary coil, secondary coil and an impulse coupling
Looking at the picture, which statement is correct?
The battery is charged to 30 volts
The battery is charged to 30 Amps
There is 30 Amps of load on the alternator
The alternator is able to supply 30 Amps of current
You are flying an aircraft fitted with a centre zero ammeter. In flight you notice that the needle of the ammeter is now to the left of zero.
What does this indicate?
The battery is discharging
The battery is charging
The alternator is providing power to the battery but not to the electrical system
The alternator is providing power to the electrical system and to the battery
You are flying an aircraft on a cross country flight and the switches are in the position shown.
Which statement is correct?
There will be no power to the aircraft electrical systems
The battery is supplying all power to the electrical systems
The alternator is supplying all power to the electrical systems
This is the normal position of the switches for a cross country flight
If a circuit breaker 'pops' during flight, how many times should you reset it?
Once
Twice
As many times as needed
Never try to reset a circuit breaker
When the battery and alternator switch is on and the engine is not running, a left zero ammeter will show...
zero
the amount of battery discharge
the amount of battery discharge
the amount of charge in the battery
One reason that prolonged use of the starter motor should be avoided is...
it can wear out the valve assembly in the engine
the key switch may deteriorate
the impulse coupling will supply too much voltage to the spark plugs
the battery may go flat
A risk with turning the alternator switch off then back on in flight is that...
there may not be enough power in the battery to re-energise the windings in the alternator
it may cause the alternator to over-charge the battery
it is likely to cause the battery to fail
circuit breakers react badly to cycling an alternator
You are flying an aircraft that has a voltmeter and a centre zero ammeter. You notice that the ammeter reads -5 Amps and the voltmeter reads +8 Volts. What is the likely cause of this?
Alternator failure
Battery failure
Voltmeter failure
The master switch has been turned off
Non-essential electrical equipment should be switched off when...
starting or stopping the engine
starting the engine only
stopping the engine only
when conducting a live-cut check only
