A&P Aircraft Electrical Systems Questions and Answers

Question 1

An aircraft's 24-volt lead-acid battery has 12 cells. What is the approximate voltage of each cell when the battery is fully charged?

Accepted Answer

2.1 volts

Answer

1.2 volts

Answer

1.5 volts

Answer

3.0 volts

Question 2

During a pre-flight inspection, a pilot notices that a push-to-reset circuit breaker for the landing light circuit has 'popped.' What is the primary advantage of a circuit breaker over a fuse in this scenario?

Accepted Answer

Circuit breakers can be reset, while fuses must be replaced.

Answer

Circuit breakers react faster to overcurrent situations.

Answer

Circuit breakers are less susceptible to vibration.

Answer

Circuit breakers provide both thermal and magnetic protection.

Question 3

Which of the following is a primary advantage of an alternator over a generator in a light aircraft electrical system?

Accepted Answer

Alternators are lighter and produce more stable voltage at low engine RPMs.

Answer

Alternators do not require a voltage regulator for operation.

Answer

Alternators can produce AC power without the need for a rectifier.

Answer

Alternators are self-exciting and can charge a completely dead battery.

Question 4

According to AC 43.13-1B, when routing electrical wiring, what is the maximum interval between support clamps for a wire bundle?

Accepted Answer

24 inches

Answer

12 inches

Answer

18 inches

Answer

30 inches

Question 5

A technician is troubleshooting an electrical issue and needs to distribute power from a single source to multiple circuits. What component is specifically designed for this purpose in an aircraft electrical system?

Accepted Answer

A bus bar

Answer

A relay

Answer

An inverter

Answer

A transformer-rectifier unit

Question 6

What is the primary purpose of a voltage regulator in a DC generator or alternator system?

Accepted Answer

To prevent the battery from overcharging by maintaining a constant system voltage.

Answer

To convert alternating current to direct current.

Answer

To increase the output voltage as engine RPM increases.

Answer

To act as a circuit breaker in case of a voltage spike.