AMT Aircraft Electrical Systems 3

Question 1

What is the function of a voltage regulator in an aircraft generator system?

Accepted Answer

To maintain constant generator output voltage under varying loads

Answer

To limit maximum generator RPM

Answer

To convert AC output to DC for the battery

Answer

To disconnect the generator when voltage is too low

Question 2

When troubleshooting an open circuit, a voltmeter connected across the break will read:

Accepted Answer

Full system voltage

Answer

Zero volts

Answer

Half system voltage

Answer

A negative voltage

Question 3

Aircraft wiring AWG (American Wire Gauge) sizing is selected primarily based on:

Accepted Answer

The current load and allowable voltage drop over the wire length

Answer

The length of the wire run only

Answer

The operating voltage of the circuit

Answer

The temperature rating of the insulation

Question 4

A reverse current cutout relay (or reverse current relay) in a DC generator system opens when:

Accepted Answer

Generator output falls below battery voltage causing reverse current flow

Answer

Generator voltage exceeds battery voltage

Answer

The battery is fully charged

Answer

The bus voltage drops below a preset threshold

Question 5

Which of the following best describes a 'phantom load' in an aircraft electrical system?

Accepted Answer

A continuous small current drain from devices left energized when the master switch is off

Answer

An intermittent short circuit

Answer

Inductive kickback from relay coils

Answer

A resistance load created by faulty bonding straps

Question 6

The purpose of a current limiter (fuse link) between the battery and main bus is to:

Accepted Answer

Protect the heavy feeder cable from a catastrophic fault current

Answer

Limit charging current to the battery

Answer

Regulate the bus voltage

Answer

Prevent reverse polarity connection

Question 7

In an AC aircraft electrical system, frequency is expressed in hertz (Hz). What is the standard frequency used in most transport-category aircraft?

Accepted Answer

400 Hz

Answer

60 Hz

Answer

50 Hz

Answer

800 Hz