friday test

What RPM does the APU operate at?

C. 100% constant speed

Why does an APU not require a CSD?

C. It already runs at constant speed

What is used to start an APU?

B. Battery (and often a DC fuel pump)

What does a DC alternator actually produce?

B. AC that is rectified to DC

What component converts AC to DC in an alternator?

C. Diodes

How many diodes are typically used in a DC alternator?

C. 4

Which of the following is NOT part of a DC alternator?

C. Commutator

In a DC alternator, the rotor is the:

C. Field

In a DC alternator, current is induced in the:

B. Stator

Light aircraft DC alternators use what type of field?

C. Rotating field

If a small aircraft needs AC power from a DC system, it uses a:

C. Inverter

What does a voltage regulator control in an alternator?

B. Varying field circuit resistance

What provides initial excitation to the alternator field?

B. Battery

The Generator Control Unit (GCU) includes:

C. Regulator, cutout relay, and current limiter

How is loss of residual magnetism corrected?

C. Flashing the field

Adjusting multiple generators to share load equally is called:

C. Paralleling

What is the function of a resistor in the field circuit?

B. Decrease current

A generator producing only 2–3 volts likely has:

D. All of the above

A generator must produce what relative to battery voltage?

C. Higher

The rotating part of a DC generator is the:

C. Armature

A generator repeatedly tripping offline is most likely due to:

C. Low output voltage

What device disconnects a generator when output is too low?

C. Reverse current relay

A commutator is used to produce:

B. DC

Slip rings are used in:

B. AC generation

Standard AC frequency in large turbine aircraft is:

C. 400 Hz