DGCA Air Navigation: Airspeed Indicator & Airspeeds Questions
131 exam-style Airspeed Indicator & Airspeeds 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
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:
- ACAS will increase
- BEAS will decrease
- CTAS will increase
- DCAS will increase
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Correct answer: C. TAS will increase
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- Q2
In a standard atmosphere and at the sea level, the calibrated airspeed (CAS) is :
- Aequal to the true airspeed (TAS).
- Bindependent of the true airspeed (TAS).
- Clower than the true airspeed (TAS).
- Dhigher than the true airspeed (TAS).
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Correct answer: A. equal to the true airspeed (TAS).
This Explanation is Coming Soon
- Q3
In case of static port blockage, the airspeed indicator:
- AOver reads in a climb and under reads in a descent.
- BUnder reads in a descent only.
- CUnder reads in a climb and over reads in a descent.
- DOver reads in a climb only.
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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:
- Acautionary range and normal operating range.
- Bflap operating speed range and normal operating range.
- Ccautionary range and flap operating speed range.
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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:
- AEAS = CAS corrected for compressibility error
- BEAS = IAS corrected for position error
- CCAS = TAS corrected for density error
- DTAS = EAS corrected for compressibility error
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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.
- ALower TAS because air density decreases.
- BHigher TAS because air density decreases.
- CHigher TAS because air density increases.
- DLower 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:
- Athe maximum speed at which to fly with the landing gear retracted
- Bthe maximum speed at which the landing gear may be retracted or extended
- Cthe maximum speed at which to fly with the landing gear extended
- Dthe 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 :
- Areact like an altimeter.
- Bread a little high
- Cfreeze at zero
- Dread a little low.
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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:
- AThe airspeed indicator tends to under read.
- BThe airspeed indicator tends to over read.
- CIt has no influence on airspeed indicator reading.
- DThe 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:
- AInstruments error.
- BCompressibility error.
- CDensity error.
- DPosition 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:
- APs - pt.
- BPt-pd.
- CPd - ps.
- DPt-ps.
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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:
- ATAS decreases.
- BTAS remains constant.
- CTAS increases,
- DTAS 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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