CPL Aircraft General Knowledge 4

Question 1

The main bus bar in an aircraft electrical system serves to:

Accepted Answer

Distribute electrical power from sources to all electrical loads

Answer

The bus bar is a common electrical junction point that connects the battery and alternator to all aircraft electrical circuits and loads.

Question 2

An ammeter showing a DISCHARGE in flight with the engine running most likely indicates:

Accepted Answer

Alternator output is insufficient to meet current electrical demands

Answer

A discharge indication means the alternator is not supplying enough power for current loads, so the battery is being drawn down to make up the deficit.

Question 3

Transponder Mode C provides ATC with which information?

Accepted Answer

Aircraft identification code and pressure altitude

Answer

Mode C transponders reply with the assigned 4096 squawk code plus encoded pressure altitude, enabling ATC to display both identity and altitude on radar.

Question 4

DME distance displayed in the cockpit represents:

Accepted Answer

Slant range (line-of-sight distance) from aircraft to station

Answer

DME measures the slant range — the straight-line distance from the aircraft to the ground station — not the horizontal ground distance.

Question 5

Which transponder squawk code indicates lost communications (NORDO)?

Accepted Answer

7600

Answer

Squawk 7600 is the internationally recognized code for radio communications failure, alerting ATC to use light-gun signals or alternative procedures.

(CPL) Commercial Pilot Licence Practice Test

(CPL) Commercial Pilot Licence Practice Test

CPL Aircraft General Knowledge 4