Avielevate / DGCA CPL papers / Air Navigation / Altimeter Questions
Altimeter Questions — DGCA CPL Air Navigation
Chapter GN17 of the Air Navigation paper. 50 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 Altimeter 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 | 50 questions |
Sample Altimeter 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.
0225054 · Altimeter Questions
A servo altimeter is ____ than a conventional one because of ____.
- Amore accurate; electrical servos
- Bmore accurate; electrical pick-off coils
- Cless accurate; electrical servos
Why that is the answer
In a simple altimeter, the expanding and contracting **capsule** (a sealed, flexible metal box) must push the pointers itself through gears and levers. Friction in this linkage makes the needle lag and stick, especially at high altitude where each foot of height gives only a tiny pressure change.
In a **servo altimeter**, the capsule only has to move a tiny iron bar between **electrical pick-off coils** (the E- and I-bar). This needs almost no force. The coils produce an electrical signal, and a small motor (the servo) does the heavy work of turning the display.
Because the capsule is no longer loaded by friction, lag and errors are much smaller. So a servo altimeter is **more accurate because of its electrical pick-off coils**.
Look at the diagram to see how the capsule, the pick-off coils and the motor work together.
0225093 · Altimeter Questions
What happens to the altimeter reading if an aircraft flying on a constant heading meets a colder air mass?
- AIt reads less than the true altitude
- BIt reads more than the true altitude
- CIt reads zero
Why that is the answer
An altimeter assumes ISA temperatures. **Cold air is denser**, so in a cold air mass the pressure levels are squeezed together and lie lower than in ISA.
Flying on a constant heading at a constant indicated altitude, the aircraft follows one pressure level. When it meets colder air, that pressure level dips, so the aircraft goes down with it. Look at the diagram: the same altimeter reading is found lower in the cold column. The altimeter does not notice anything and keeps showing the same figure.
So the altimeter **reads more than the true altitude**.
**Tip:** 'From high to low, look out below.'
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Frequently asked
How many Altimeter Questions questions are there for the DGCA CPL Air Navigation paper?
Avielevate's bank carries 50 published Altimeter 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 Altimeter 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 Altimeter 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