OPERATION OF MICROPHONES AND HEADPHONES: DGCA Radio Telephony (R/T) questions

Question 1

A pilot is adjusting the Squelch control on the radio. What is the correct procedure and purpose of this action?

Accepted Answer

Turn the knob until the background static just disappears; its purpose is to mute the speaker when no signal is present.

Answer

Turn the knob until the incoming transmissions are as loud as possible; its purpose is to amplify distant signals.

Answer

Press the PTT and speak normally while adjusting the knob; its purpose is to ensure the transmitted voice is clear.

Question 2

The VHF communication range is primarily limited by:

Accepted Answer

Line-of-sight distance and Earth's curvature.

Answer

Solar ionization and skywave propagation.

Answer

Receiver audio volume and squelch settings.

Question 3

A pilot on an oceanic flight using HF communication experiences a loud, constant hiss and crackle that masks the weak ATC signal. This is most likely caused by:

Accepted Answer

Atmospheric noise (QRN) from distant lightning storms.

Answer

Precipitation static from flying through a cloud layer.

Answer

Man-made interference (QRM) from the aircraft's own electrical systems.

Question 4

The squelch control on an aircraft radio is used to:

Accepted Answer

Mute background static when no valid signal is received.

Answer

Adjust microphone sensitivity.

Answer

Regulate transmission power to avoid interference.

Question 5

The Automatic Volume Control (AVC) circuit in a receiver ensures that:

Accepted Answer

Loud and weak transmissions are heard at a consistent volume.

Answer

All weak signals are muted to prevent noise.

Answer

The microphone gain is automatically adjusted during transmission.

OPERATION OF MICROPHONES AND HEADPHONES: DGCA Radio Telephony (R/T) questions

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