Avielevate / DGCA CPL papers / Air Navigation / Altitude Alert Systems
Altitude Alert Systems — DGCA CPL Air Navigation
Chapter GN22 of the Air Navigation paper. 29 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 Altitude Alert Systems 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 | 29 questions |
Sample Altitude Alert Systems 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.
0230041 · Altitude Alert Systems
In which frequency band do modern low-altitude radio altimeters transmit?
- AHF (high frequency)
- BUHF (ultra high frequency)
- CSHF (super high frequency)
Why that is the answer
Radio frequencies are grouped into bands, each ten times wider than the one before:
- HF (high frequency): 3 to 30 MHz
- VHF: 30 to 300 MHz
- UHF (ultra high frequency): 300 to 3,000 MHz
- **SHF (super high frequency): 3 to 30 GHz** (3,000 to 30,000 MHz)
Modern low-altitude radio altimeters transmit between **4,200 and 4,400 MHz**, which is 4.2 to 4.4 GHz. That falls inside the 3 to 30 GHz range. Waves at these frequencies are only a few centimetres long, so they are called **centimetric** waves, and they give a good reflection from the ground directly below.
So radio altimeters transmit in the **SHF (super high frequency)** band.
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Frequently asked
How many Altitude Alert Systems questions are there for the DGCA CPL Air Navigation paper?
Avielevate's bank carries 29 published Altitude Alert Systems 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 Altitude Alert Systems?
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 Altitude Alert Systems?
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