In a standard atmosphere and at the sea level, the calibrated airspeed (CAS) is :

equal to the true airspeed (TAS).

independent of the true airspeed (TAS).

lower than the true airspeed (TAS).

higher than the true airspeed (TAS).

In case of static port blockage, the airspeed indicator:

Under reads in a climb and over reads in a descent.

Over reads in a climb and under reads in a descent.

Some ASIs have coloured arcs and lines marked on their dials. A yellow arc and a white arc indicate:

cautionary range and flap operating speed range.

cautionary range and normal operating range.

flap operating speed range and normal operating range.

Select the correct statement:

EAS = CAS corrected for compressibility error

EAS = IAS corrected for position error

CAS = TAS corrected for density error

TAS = EAS corrected for compressibility error

The IAS will be too low when accelerating at constant altitude.

Higher TAS because air density decreases.

Lower TAS because air density decreases.

Higher TAS because air density increases.

Lower TAS because air density increases.

the maximum speed at which the landing gear may be retracted or extended

the maximum speed at which to fly with the landing gear retracted

the maximum speed at which to fly with the landing gear extended

the minimum speed at which to fly with the landing gear extended

The alternate static source of a light non-pressurised aeroplane is located in the flight deck. When used:

The airspeed indicator tends to over read.

The airspeed indicator tends to under read.

It has no influence on airspeed indicator reading.

The airspeed indicator indicates a consistent decreasing speed.

When climbing at a constant CAS in standard atmosphere:

TAS first decreases, then remains constant above the trapopause.

DGCA Air Navigation: Airspeed Indicator & Airspeeds Questions

131 exam-style Airspeed Indicator & Airspeeds 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
An aircraft maintaining a constant CAS and altitude is flying from a cold airmass into warmer air. The effect of the change of temperature on the speed will be:
- A CAS will increase
- B EAS will decrease
- C TAS will increase
- D CAS will increase
Show answer

Correct answer: C. TAS will increase

This Explanation is Coming Soon
Q2
In a standard atmosphere and at the sea level, the calibrated airspeed (CAS) is :
- A equal to the true airspeed (TAS).
- B independent of the true airspeed (TAS).
- C lower than the true airspeed (TAS).
- D higher than the true airspeed (TAS).
Show answer

Correct answer: A. equal to the true airspeed (TAS).

This Explanation is Coming Soon
Q3
In case of static port blockage, the airspeed indicator:
- A Over reads in a climb and under reads in a descent.
- B Under reads in a descent only.
- C Under reads in a climb and over reads in a descent.
- D Over reads in a climb only.
Show answer

Correct answer: C. Under reads in a climb and over reads in a descent.

With static blocked, the ASI under-reads in a climb and over-reads in a descent.
Q4
Some ASIs have coloured arcs and lines marked on their dials. A yellow arc and a white arc indicate:
- A cautionary range and normal operating range.
- B flap operating speed range and normal operating range.
- C cautionary range and flap operating speed range.
Show answer

Correct answer: C. cautionary range and flap operating speed range.

On the airspeed indicator the yellow arc marks the cautionary range, where flight is permitted only in smooth air, while the white arc marks the flap operating speed range from the landing-configuration stall to the maximum flap-extended speed.
Q5
Select the correct statement:
- A EAS = CAS corrected for compressibility error
- B EAS = IAS corrected for position error
- C CAS = TAS corrected for density error
- D TAS = EAS corrected for compressibility error
Show answer

Correct answer: A. EAS = CAS corrected for compressibility error

This Explanation is Coming Soon
Q6
The IAS will be too low when accelerating at constant altitude.
- A Lower TAS because air density decreases.
- B Higher TAS because air density decreases.
- C Higher TAS because air density increases.
- D Lower TAS because air density increases.
Show answer

Correct answer: B. Higher TAS because air density decreases.

Lower air density gives a higher TAS for the same indicated speed.
Q7
VLO is defined as:
- A the maximum speed at which to fly with the landing gear retracted
- B the maximum speed at which the landing gear may be retracted or extended
- C the maximum speed at which to fly with the landing gear extended
- D the minimum speed at which to fly with the landing gear extended
Show answer

Correct answer: B. the maximum speed at which the landing gear may be retracted or extended

This Explanation is Coming Soon
Q8
A pitot blockage of both the ram air input and the drain hole with the static port open causes the airspeed indicator to :
- A react like an altimeter.
- B read a little high
- C freeze at zero
- D read a little low.
Show answer

Correct answer: A. react like an altimeter.

This Explanation is Coming Soon
Q9
The alternate static source of a light non-pressurised aeroplane is located in the flight deck. When used:
- A The airspeed indicator tends to under read.
- B The airspeed indicator tends to over read.
- C It has no influence on airspeed indicator reading.
- D The airspeed indicator indicates a consistent decreasing speed.
Show answer

Correct answer: B. The airspeed indicator tends to over read.

Lower cabin static pressure makes the airspeed indicator over-read.
Q10
The EAS is obtained from the CAS by correcting for:
- A Instruments error.
- B Compressibility error.
- C Density error.
- D Position error.
Show answer

Correct answer: B. Compressibility error.

EAS is CAS corrected for compressibility error.
Q11
Given: Pt = total pressure: Ps = static pressure: Pd = dynamic pressure: The airspeed indicator measures:
- A Ps - pt.
- B Pt-pd.
- C Pd - ps.
- D Pt-ps.
Show answer

Correct answer: D. Pt-ps.

The ASI measures dynamic pressure, total minus static (Pt - Ps).
Q12
When climbing at a constant CAS in standard atmosphere:
- A TAS decreases.
- B TAS remains constant.
- C TAS increases,
- D TAS first decreases, then remains constant above the trapopause.
Show answer

Correct answer: C. TAS increases,

Climbing at constant CAS through falling density makes TAS increase.

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An aircraft maintaining a constant CAS and altitude is flying from a cold airmass into warmer air. The effect of the change of temperature on the speed will be:

In a standard atmosphere and at the sea level, the calibrated airspeed (CAS) is :

In case of static port blockage, the airspeed indicator:

Some ASIs have coloured arcs and lines marked on their dials. A yellow arc and a white arc indicate:

Select the correct statement:

The IAS will be too low when accelerating at constant altitude.

VLO is defined as:

A pitot blockage of both the ram air input and the drain hole with the static port open causes the airspeed indicator to :

The alternate static source of a light non-pressurised aeroplane is located in the flight deck. When used:

The EAS is obtained from the CAS by correcting for:

Given: Pt = total pressure: Ps = static pressure: Pd = dynamic pressure: The airspeed indicator measures:

When climbing at a constant CAS in standard atmosphere:

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