Avielevate / DGCA CPL papers / Air Navigation / Radar
Radar — DGCA CPL Air Navigation
Chapter GN32 of the Air Navigation paper. 64 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 Radar 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 | 64 questions |
Sample Radar 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.
0240103 · Radar
At FL210, a pilot gets no DME distance from a DME station about 220 NM away. The reason is that:
- AThe aeroplane is circling around the station
- BThe aeroplane is below the line-of-sight altitude
- CThe altitude is too high
Why that is the answer
**DME** uses UHF radio waves. These travel in straight lines and do not bend around the curve of the Earth. So the aircraft can only receive a station that is within its **line of sight**, above the horizon.
Look at the diagram: the higher the aircraft, the further it can "see" over the curve of the Earth. The rule of thumb is:
Range (NM) ≈ 1.25 × (√height of station + √height of aircraft), heights in feet
Taking the station near sea level:
√21,000 ≈ 145
Range ≈ 1.25 × 145 ≈ 181 NM
The station is about 220 NM away, well beyond 181 NM, so it is hidden below the horizon. The aircraft would need to climb to about 31,000 ft to receive it at that distance.
So the reason is that **the aeroplane is below the line-of-sight altitude**.
Free while we are testing
Avielevate is in an open testing period — nobody is being charged. Create an account, fill in
the short form on the pricing page, and we switch on three months of full access: the whole
bank, timed mock exams, explanations and weak-topic analytics.
Avielevate is a preparation tool. Always study alongside the official DGCA
publications and the approved reference material for your course.
Frequently asked
How many Radar questions are there for the DGCA CPL Air Navigation paper?
Avielevate's bank carries 64 published Radar 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 Radar?
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 Radar?
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