Free A&P Aircraft Electrical & Avionics Systems Questions and Answers

Question 1

What is the primary purpose of a current limiter in an aircraft electrical system?

Accepted Answer

To prevent circuit overloads by interrupting excessive current

Answer

A current limiter, often a fuse or a specific type of circuit breaker, is a safety device designed to protect aircraft electrical circuits from damage caused by excessive current flow. When the current exceeds a predetermined safe limit, the limiter automatically interrupts the circuit. This action prevents overheating of wires, potential component damage, and reduces the risk of electrical fires, thereby safeguarding the entire electrical system.

Question 2

Which instrument relies on a gyroscope to indicate aircraft attitude?

Accepted Answer

Attitude indicator (artificial horizon)

Answer

The attitude indicator, also known as an artificial horizon, is a fundamental flight instrument that displays the aircraft's pitch and roll relative to the natural horizon. It relies on a rapidly spinning gyroscope, which maintains its rigidity in space, to provide a stable reference. This allows pilots to accurately determine the aircraft's orientation, especially in conditions of poor visibility or instrument flight rules (IFR).

Question 3

What is the function of a static wick on an aircraft?

Accepted Answer

To dissipate static electricity from the airframe

Answer

Static wicks are small, pointed conductors typically installed on the trailing edges of aircraft wings and control surfaces. Their primary function is to safely dissipate static electricity that builds up on the airframe during flight, particularly in conditions like precipitation or dry air. This prevents interference with sensitive avionics and communication systems, ensuring clear radio transmissions and accurate instrument readings.

Question 4

Which component converts alternating current (AC) to direct current (DC) in an aircraft electrical system?

Accepted Answer

Rectifier

Answer

A rectifier is an electrical device specifically designed to convert alternating current (AC) into direct current (DC). In an aircraft electrical system, rectifiers are essential for transforming the AC power generated by alternators into DC power. This DC power is then used to operate various aircraft systems, such as avionics, lighting, and to charge the aircraft's batteries, ensuring a stable and usable power supply.

Question 5

What is the purpose of a transponder in an aircraft's avionics system?

Accepted Answer

To respond to radar interrogations with identification and altitude data

Answer

A transponder is a vital piece of avionics equipment that enhances an aircraft's visibility to air traffic control (ATC) radar. When interrogated by ground radar, the transponder automatically transmits a coded reply containing the aircraft's identification (squawk code) and, if equipped, its pressure altitude. This allows ATC to accurately track the aircraft, manage air traffic flow, and ensure safe separation between aircraft.

A&P - Certified Aircraft Mechanic Practice Test

A&P - Certified Aircraft Mechanic Practice Test

Free A&P Aircraft Electrical & Avionics Systems Questions and Answers