Avielevate / DGCA CPL papers / Air Navigation / Basic Radio Theory
Basic Radio Theory — DGCA CPL Air Navigation
Chapter GN25 of the Air Navigation paper. 31 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 Basic Radio Theory 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 | 31 questions |
Sample Basic Radio Theory 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.
0233055 · Basic Radio Theory
A radio aid has a wavelength of 19 cm. What are its frequency and waveband?
- A15.79 Hz, ELF (Extremely Low Frequency)
- B15.79 kHz, VLF (Very Low Frequency)
- C1.579 GHz, UHF
Why that is the answer
All radio waves travel at about 300,000,000 m/s, so **frequency (Hz) = 300,000,000 ÷ wavelength (m)**. A short wavelength means a high frequency.
Step 1, change the wavelength to metres: 19 cm = 0.19 m.
Step 2: frequency = 300,000,000 ÷ 0.19 ≈ 1,579,000,000 Hz.
Step 3, convert: 1,579,000,000 Hz = 1,579 MHz = 1.579 GHz.
Step 4, find the band. **UHF** covers 300 MHz to 3 GHz (wavelengths 1 m down to 10 cm), and 1.579 GHz is inside it (see the table).
So the frequency is **1.579 GHz, UHF**.
**Tip:** this is almost exactly the GPS L1 frequency (1,575.42 MHz).
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Frequently asked
How many Basic Radio Theory questions are there for the DGCA CPL Air Navigation paper?
Avielevate's bank carries 31 published Basic Radio Theory 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 Basic Radio Theory?
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 Basic Radio Theory?
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