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Radio Telephony (R/T) · Ready Aviator Question Bank · Radio Principles and Practice

Radio navigation and surveillance aids: DGCA Radio Telephony (R/T) questions

104 questions in this chapter of Ready Aviator Question Bank. 5 are on this page with the correct answer shown.

Practise these five questions

Five questions from the chapter

Question 1 of 5

The ADF panel has a switch marked BFO. When you switch it in, what job is it doing?

  • aTo filter out static from nearby thunderstorms
  • Correct answer, b: To make an unmodulated (CW) NDB ident audible
  • cTo correct the needle for quadrantal error

Question 2 of 5

You tune an NDB that identifies by keying its plain carrier on and off (emission NON A1A). What does selecting the BFO do for you?

  • aLocks the needle onto the strongest nearby beacon
  • bNarrows the receiver bandwidth to cut interference
  • Correct answer, c: Makes the Morse ident of an unmodulated keyed carrier audible

Question 3 of 5

The loop aerial's figure of eight pattern is added to the sense aerial's circular pattern. What is the resulting polar diagram called?

  • Correct answer, a: Cardioid
  • bEllipse
  • cToroid

Question 4 of 5

An ADF must know which of the loop's two nulls points at the beacon. Which combined pattern, with only one null, settles this?

  • aClover leaf
  • bParabola
  • Correct answer, c: Cardioid

Question 5 of 5

On the ADF control unit you move the function switch to ADF (labelled COMP on some sets). What does the receiver now give you?

  • aManual loop operation: you turn the loop by hand to find the null
  • bSelf test: the needle swings to a fixed reference position and holds
  • Correct answer, c: Automatic direction finding: the needle gives continuous bearing to the beacon

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