DGCA Air Navigation: Altimeters Questions
126 exam-style Altimeters questions for the DGCA Air Navigationpaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
- Q1
The altimeter is subject to static pressure error. This error varies according to:
- ATAS and altimeter setting.
- BTAS and OAT.
- CAngle of attack and OAT.
- DTAS and angle of attack
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Correct answer: D. TAS and angle of attack
Static pressure error varies with TAS and angle of attack.
- Q2
During the approach, a crew reads on the radio altimeter the value of 650 ft. This is an Indication of the true?
- AHeight of the lowest wheels with regard to the ground at any time.
- BHeight of the aircraft with regard to the ground at any time.
- CHeight of the aircraft with regard to the runway.
- DAltitude of the aircraft.
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Correct answer: B. Height of the aircraft with regard to the ground at any time.
A radio altimeter shows the aircraft's height above the ground at any time.
- Q3
The altimeter is subject to static pressure error. This error results from:
- AIncorrect pressure sensing caused by disturbance of airflow around the static ports,
- BImperfect elasticity of the aneroid capsule.
- CFriction inside the instruments.
- DCabin pressure slightly lower than outside air pressure due to airflow over the fuselage.
Show answer
Correct answer: A. Incorrect pressure sensing caused by disturbance of airflow around the static ports,
Static pressure error results from disturbed airflow around the static ports.
- Q4
Altimeter is based on what?
- ADifferential
- BStatic
- CTotal
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Correct answer: B. Static
Altimeters measure static pressure from the atmosphere to determine altitude, adjusted to a reference like QNH.
- Q5
An aircraft taking off from an airfield with QNH set in the altimeter has both static vents blocked by ice. As the aircraft climbs away the altimeter will:
- ARead the airfield elevation
- BIndicate the aircraft height amsl
- CRead the height of the aircraft above the airfield
- DShow only a very small increase in height
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Correct answer: A. Read the airfield elevation
This Explanation is Coming Soon
- Q6
The true altitude of an aircraft in flight is shown from:
- Athe standard atmosphere
- Bpressure altitude
- Cdensity altitude
- Dtemperature altitude
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Correct answer: B. pressure altitude
This Explanation is Coming Soon
- Q7
For most radio altimeters, when a system error occurs during approach the?
- AHeight indication is removed.
- BDH lamp flashes red and the audio signal sounds,
- CDH lamp flashes red.
- DAudio warning signal sounds.
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Correct answer: A. Height indication is removed.
A system error removes the radio altimeter's height indication.
- Q8
QNH is 1035 hPa, height of mountain is 10600 ft, minimum terrain clearance required is 1500 ft. What is the minimum flight level?
- A130
- B160
- C120
Show answer
Correct answer: B. 160
Required altitude = 10600 + 1500 = 12100 ft. QNH 1035 hPa is above standard 1013 hPa, so pressure altitude is lower. For simplicity, at 1035 hPa, 1 hPa ≈ 27 ft. Difference of 22 hPa × 27 ≈ 594 ft lower. Thus, 12100 + 594 ≈ 12694 ft pressure altitude. Nearest flight level above is FL130 (13000 ft), but FL160 ensures safe clearance.
- Q9
A vibrator may be fitted to an altimeter to overcome:
- Afriction
- Bhysterysis
- Clag
- Dpressure error
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Correct answer: A. friction
This Explanation is Coming Soon
- Q10
The servo-assisted altimeter is more accurate than a simple altimeter because the small movements of:
- AThe pointers are detected by a very sensitive electro-magnetic pick-off.
- BThe capsules are detected by a very sensitive electro-magnetic pick-off.
- CThe capsules are not taken into account.
- DThe capsules are inhibited.
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Correct answer: B. The capsules are detected by a very sensitive electro-magnetic pick-off.
A sensitive electro-magnetic pick-off detects the small capsule movements, improving accuracy.
- Q11
An aircraft is flying at constant indicated altitude, over a warm airmass. The altimeter reading will be:
- Acorrect
- Bgreater than the real altitude
- Cless than the real altitude
- Doscillating around the correct altitude
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Correct answer: C. less than the real altitude
This Explanation is Coming Soon
- Q12
What is Density Altitude?
- Atemperature altitude
- Bpressure altitude corrected for the prevailing temperature
- Cthe altitude in the International Standard Atmosphere at which the prevailing density would be found
- Dpressure altitude corrected for Total Air Temperature
Show answer
Correct answer: C. the altitude in the International Standard Atmosphere at which the prevailing density would be found
This Explanation is Coming Soon
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