CAT Avionics and Electrical Systems 2

Question 1

What is the primary function of an aircraft Auxiliary Power Unit (APU)?

Accepted Answer

Supply electrical power and bleed air when main engines are not running

Answer

The APU provides electrical power and pneumatic bleed air for engine starting and environmental control when main engines are shut down.

Question 2

In avionics maintenance, what does the acronym BITE stand for?

Accepted Answer

Built-In Test Equipment

Answer

BITE (Built-In Test Equipment) refers to self-diagnostic hardware and software integrated into avionics units to detect and report system faults.

Question 3

Which wire insulation material is most commonly used in aircraft applications for its high-temperature resistance and low flammability?

Accepted Answer

PTFE (Polytetrafluoroethylene/Teflon)

Answer

PTFE (Teflon) is preferred in aircraft wiring due to its excellent temperature resistance, chemical inertness, and low flammability under aerospace conditions.

Question 4

What is the function of a Bus Tie Breaker (BTB) in an aircraft AC electrical system?

Accepted Answer

Interconnect multiple AC buses or isolate a faulted bus from the network

Answer

Bus Tie Breakers allow power sharing between generators by connecting buses together or isolate a faulted bus to protect the remaining healthy electrical network.

Question 5

Which avionics system specifically warns flight crews of potential Controlled Flight Into Terrain (CFIT)?

Accepted Answer

TAWS/GPWS (Terrain Awareness and Warning System / Ground Proximity Warning System)

Answer

TAWS/GPWS monitors aircraft altitude, terrain proximity, and flight path geometry to alert crews before potential ground impact.

CAT - Certified Aerospace Technician Practice Test

CAT - Certified Aerospace Technician Practice Test

CAT Avionics and Electrical Systems 2