AET AET Aircraft Power Systems 2

Question 1

Which type of aircraft battery is most commonly used in modern general aviation aircraft due to its maintenance advantages?

Accepted Answer

Sealed absorbed glass mat (AGM) lead-acid

Answer

Sealed AGM lead-acid batteries are widely used in general aviation because they are maintenance-free, spill-proof, and do not require water additions like flooded-cell batteries.

Question 2

What is the primary advantage of nickel-cadmium (NiCd) batteries used in turbine-powered aircraft over lead-acid batteries?

Accepted Answer

More stable voltage during discharge and better high-current performance

Answer

NiCd batteries maintain a relatively flat discharge voltage and deliver high cranking currents reliably, making them preferred for turbine engine starts and emergency power in transport aircraft.

Question 3

An aircraft inverter converts aircraft DC power into AC power primarily to supply which type of equipment?

Accepted Answer

AC-powered instruments and avionics that require 115V 400 Hz AC

Answer

Inverters convert 28V DC bus power to 115V 400 Hz AC to power AC instruments, gyros, and some avionics in aircraft that do not have AC generators.

Question 4

What does the term 'load shedding' mean in the context of aircraft electrical power management?

Accepted Answer

Disconnecting non-essential electrical loads to reduce demand on a degraded power source

Answer

Load shedding involves selectively disconnecting non-essential electrical consumers to reduce the demand on a power system operating in a degraded or emergency condition.

Question 5

A ground power unit (GPU) is connected to an aircraft for maintenance. What precaution must be taken before connecting the GPU to avoid damage to avionics?

Accepted Answer

Verify GPU voltage and polarity match aircraft requirements before connecting

Answer

Before connecting a GPU, technicians must verify that the GPU output voltage and polarity are correct for the aircraft system to prevent damage to sensitive avionics and electrical components.

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET AET Aircraft Power Systems 2