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ADF / NDB Questions — DGCA CPL Air Navigation
Chapter GN26 of the Air Navigation paper. 30 practice questions in the Avielevate bank, every one with its answer key, filterable into a timed set on this chapter alone.
What this chapter covers
The learning objectives we file ADF / NDB Questions questions under, and how many sit behind each. These come straight out of the bank and are regenerated whenever it changes — they are what is there today, not a claim.
| Learning objective | In the bank |
|---|
| __GEN__ General | 30 questions |
Sample ADF / NDB Questions questions, answered and explained
Real questions from this chapter, with the answer marked and the reasoning written out — the same explanations you get inside the app.
0234039 · ADF / NDB Questions
What is the wavelength of an NDB transmitting on 373 kHz?
- A800m
- B80m
- C8000m
Why that is the answer
All radio waves travel at about 300,000,000 m/s. The length of one wave is that speed divided by the frequency, so **wavelength (m) = 300 ÷ frequency (MHz)**.
Step 1, convert the frequency to MHz: 373 kHz = 0.373 MHz.
Step 2: wavelength = 300 ÷ 0.373 ≈ 804 m.
Step 3, round: about 800 m.
So the wavelength is **800 m**, a hectometric wave in the MF band (see the table).
**Tip:** to divide by a small decimal, think 'how many 0.373s go into 300?': about 800.
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Frequently asked
How many ADF / NDB Questions questions are there for the DGCA CPL Air Navigation paper?
Avielevate's bank carries 30 published ADF / NDB Questions questions for Air Navigation, mapped across 1 learning objective. Every one has its answer key, and explanations are being written across the whole bank.
How much of the Air Navigation paper is ADF / NDB Questions?
The DGCA does not publish a per-chapter breakdown of its papers, so nobody can honestly tell you — and we will not guess. What we can tell you is what students who have just sat a paper reported meeting, which is measured rather than rumoured: that is the exam recall report inside the app.
What is the best way to revise ADF / NDB Questions?
Sit a short timed set on this chapter alone, tag how sure you were of each answer, then drill the two that actually leak marks: the ones you got right while guessing, and the ones you got wrong while confident. Avielevate does that tagging for you and puts anything you got wrong back in front of you on a spaced schedule.
The rest of the Air Navigation paper
One account covers every chapter of every paper.
← All Air Navigation chapters · All six DGCA CPL papers