Equipment Functions

Question 1

Some aircraft and avionics equipment operates with a prime power line frequency of 400 Hz. What is the principle advantage of a higher line frequency?

Answer 1

The magnetic devices in a 400 Hz power supply such as transformers, chokes and filters are smaller and lighter than those used in 60 Hz power supplies.

Question 2

Aviation services use predominantly ____ microphones.

Answer 2

Dynamic

Question 3

Typical airborne H transmitters usually provide a nominal RF power output to the antenna of ____ watts, compared with ____ watts RF output from a typical VHF transmitter.

Answer 3

100, 20

Question 4

Before ground testing an aircraft RADAR, the operator should:

Answer 4

Ensure that the area in front of the antenna is clear of other maintenance personnel to avoid radiation hazards.

Question 5

What type of antenna is used in an aircraft’s Very High Frequency Omnidirectional Range (VOR) and Localizer (LOC) installations?

Answer 5

Horizontally polarized omnidirection reception antenna.

Question 6

What is the function of a commercial aircraft’s SELCAL installation? SELCAL is a type of aircraft communications ______.

Answer 6

System where a ground-based transmitter can call a selected aircraft or group of aircraft without the flight crew monitoring the ground-station frequency.