CPL Acft Tech - Electrical systems

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