During the approach, a crew reads on the radio altimeter the value of 650 ft. This is an Indication of the true?

Height of the aircraft with regard to the ground at any time.

Height of the lowest wheels with regard to the ground at any time.

Height of the aircraft with regard to the runway.

The altimeter is subject to static pressure error. This error results from:

Incorrect pressure sensing caused by disturbance of airflow around the static ports,

Imperfect elasticity of the aneroid capsule.

Friction inside the instruments.

Cabin pressure slightly lower than outside air pressure due to airflow over the fuselage.

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:

Indicate the aircraft height amsl

Read the height of the aircraft above the airfield

Show only a very small increase in height

For most radio altimeters, when a system error occurs during approach the?

DH lamp flashes red and the audio signal sounds,

The servo-assisted altimeter is more accurate than a simple altimeter because the small movements of:

The capsules are detected by a very sensitive electro-magnetic pick-off.

The pointers are detected by a very sensitive electro-magnetic pick-off.

The capsules are not taken into account.

An aircraft is flying at constant indicated altitude, over a warm airmass. The altimeter reading will be:

oscillating around the correct altitude

What is Density Altitude?

the altitude in the International Standard Atmosphere at which the prevailing density would be found

pressure altitude corrected for the prevailing temperature

pressure altitude corrected for Total Air Temperature

DGCA Air Navigation: Altimeters Questions

126 exam-style Altimeters questions for the DGCA Air Navigation paper (CPL · ATPL · PPL). 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:
- A TAS and altimeter setting.
- B TAS and OAT.
- C Angle of attack and OAT.
- D TAS and angle of attack
Show answer

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?
- A Height of the lowest wheels with regard to the ground at any time.
- B Height of the aircraft with regard to the ground at any time.
- C Height of the aircraft with regard to the runway.
- D Altitude of the aircraft.
Show answer

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:
- A Incorrect pressure sensing caused by disturbance of airflow around the static ports,
- B Imperfect elasticity of the aneroid capsule.
- C Friction inside the instruments.
- D Cabin 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?
- A Differential
- B Static
- C Total
Show answer

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:
- A Read the airfield elevation
- B Indicate the aircraft height amsl
- C Read the height of the aircraft above the airfield
- D Show only a very small increase in height
Show answer

Correct answer: A. Read the airfield elevation

This Explanation is Coming Soon
Q6
The true altitude of an aircraft in flight is shown from:
- A the standard atmosphere
- B pressure altitude
- C density altitude
- D temperature altitude
Show answer

Correct answer: B. pressure altitude

This Explanation is Coming Soon
Q7
For most radio altimeters, when a system error occurs during approach the?
- A Height indication is removed.
- B DH lamp flashes red and the audio signal sounds,
- C DH lamp flashes red.
- D Audio warning signal sounds.
Show answer

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?
- A 130
- B 160
- C 120
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:
- A friction
- B hysterysis
- C lag
- D pressure error
Show answer

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:
- A The pointers are detected by a very sensitive electro-magnetic pick-off.
- B The capsules are detected by a very sensitive electro-magnetic pick-off.
- C The capsules are not taken into account.
- D The capsules are inhibited.
Show answer

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:
- A correct
- B greater than the real altitude
- C less than the real altitude
- D oscillating around the correct altitude
Show answer

Correct answer: C. less than the real altitude

This Explanation is Coming Soon
Q12
What is Density Altitude?
- A temperature altitude
- B pressure altitude corrected for the prevailing temperature
- C the altitude in the International Standard Atmosphere at which the prevailing density would be found
- D pressure 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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The altimeter is subject to static pressure error. This error varies according to:

During the approach, a crew reads on the radio altimeter the value of 650 ft. This is an Indication of the true?

The altimeter is subject to static pressure error. This error results from:

Altimeter is based on what?

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:

The true altitude of an aircraft in flight is shown from:

For most radio altimeters, when a system error occurs during approach the?

QNH is 1035 hPa, height of mountain is 10600 ft, minimum terrain clearance required is 1500 ft. What is the minimum flight level?

A vibrator may be fitted to an altimeter to overcome:

The servo-assisted altimeter is more accurate than a simple altimeter because the small movements of:

An aircraft is flying at constant indicated altitude, over a warm airmass. The altimeter reading will be:

What is Density Altitude?

114 more Altimeters questions in the full bank