AMT AMT Avionics & Electrical Systems

Question 1

What is the standard voltage for most general aviation aircraft electrical systems?

Accepted Answer

28 volts DC

Answer

Most general aviation and military aircraft use a 28-volt DC electrical system as the standard operating voltage.

Question 2

Which federal regulation governs the installation of avionics and electrical equipment in US-certificated aircraft?

Accepted Answer

14 CFR Part 43

Answer

14 CFR Part 43 governs maintenance, preventive maintenance, rebuilding, and alteration of aircraft, including avionics and electrical system work.

Question 3

What device protects an aircraft electrical circuit from overcurrent conditions?

Accepted Answer

Circuit breaker or fuse

Answer

Circuit breakers and fuses protect electrical circuits by interrupting current flow when it exceeds a safe level.

Question 4

When troubleshooting an aircraft avionics system, what instrument is most commonly used to measure resistance?

Accepted Answer

Multimeter (ohmmeter function)

Answer

A multimeter set to the ohmmeter function measures resistance in wiring and components during avionics troubleshooting.

Question 5

What type of wire insulation is required for aircraft electrical wiring exposed to high-temperature engine compartment areas?

Accepted Answer

MIL-SPEC high-temperature insulation (e.g., PTFE)

Answer

MIL-SPEC high-temperature wiring such as PTFE (Teflon) insulated wire is required in engine compartments to withstand extreme heat.

AMT - Certified Aircraft Maintenance Technician Practice Test