AET AET Aircraft Power Systems 3

Question 1

What is the function of a current transformer (CT) in an aircraft AC power system?

Accepted Answer

Provides a proportional low-current signal for metering and protection circuits without direct connection

Answer

Steps up voltage for transmission

Answer

Converts AC to DC

Answer

Regulates frequency output of the generator

Question 2

What is the role of a voltage regulator in an aircraft alternator/generator system?

Accepted Answer

To maintain constant output voltage despite varying loads and engine speeds

Answer

To limit the maximum engine RPM

Answer

To protect against reverse polarity

Answer

To provide overcurrent protection

Question 3

When troubleshooting an aircraft electrical system and the ammeter shows a discharge indication with the engine running, what is the most likely cause?

Accepted Answer

The alternator is not producing output or is off-line

Answer

Battery is fully charged

Answer

An open circuit in a non-essential bus

Answer

The avionics master switch is OFF

Question 4

Thermal runaway in a NiCd aircraft battery is dangerous because it can result in:

Accepted Answer

A self-sustaining charging reaction that generates heat, gas, and potential fire

Answer

Reduced avionics noise

Answer

Lower battery voltage output

Answer

Increased battery capacity

Question 5

What is the purpose of an overvoltage protection relay in an aircraft electrical system?

Accepted Answer

To disconnect the alternator from the bus if output voltage rises above a safe threshold

Answer

To regulate battery charging current

Answer

To reset tripped circuit breakers automatically

Answer

To balance load between two generators

Question 6

In aircraft wiring, what is the minimum voltage drop allowed across a wire under full load current according to MIL-W-5088 / FAA AC 43.13-1B guidelines?

Accepted Answer

The voltage drop should be as low as possible, typically not to exceed 1 volt for essential circuits

Answer

Up to 5 volts for any circuit

Answer

Exactly 0 volts

Answer

No more than 10% of supply voltage for all circuits