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DGCA Technical General · 24 questions

Airspeed Indicators: DGCA Technical General Questions and Answers

24 practice questions on Airspeed Indicators with answers and explanations, plus the key concepts and formulas, from the TrueHeading question bank.

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About this topic

Use this page to revise Airspeed Indicators for the DGCA Technical General paper. Below are the key ideas first, then 9 practice questions with answers and explanations, picked from the 24 questions in the TrueHeading bank for this topic.

In short: White arc: flap range (VSO to VFE). Green: normal (VS1 to VNO). Yellow: caution (VNO to VNE). Red line: never exceed (VNE).

Open the full set in the student zone to answer every question, track your accuracy and take timed mock tests.

Key concepts: Airspeed Indicators

3 ideas to know cold.

ASI colour markings?

White arc: flap range (VSO to VFE). Green: normal (VS1 to VNO). Yellow: caution (VNO to VNE). Red line: never exceed (VNE).

VSOVFEVS1VNOVNOVNEwhite arc: flap rangegreen arc: normal operatingyellow: caution, smooth air onlyred line: never exceed

ASI construction and errors?

A diaphragm connected to the pitot, case to the static.

  • Instrument error, position (pressure) error, density error, compressibility error and lag
  • Position error is lower with the static source located correctly

What do the ASI colour markings mean?

White arc: flap range (Vso to Vfe). Green: normal range (Vs1 to Vno). Yellow: caution (Vno to Vne). Red line: Vne.

  • Blue line: Vyse on twins
  • Vmo/Mmo barber pole
  • V1, VR, V2 on jets (bugs)

Practice questions: Airspeed Indicators

Tap “Show answer” after you have tried each one.

Q1The airspeed indicator uses:

  1. an aneroid capsule measuring static pressure
  2. a magnetic compass
  3. a diaphragm (capsule) measuring dynamic pressure
  4. a gyroscope
Show answer

Answer: C. a diaphragm (capsule) measuring dynamic pressure

The capsule is connected to pitot; the case to static.

Q2The white arc on an ASI shows:

  1. the never exceed speed
  2. the caution range
  3. the normal operating range
  4. the flap operating speed range
Show answer

Answer: D. the flap operating speed range

Lower end is Vso (stall with flaps) and upper end is Vfe.

Q3The green arc on an ASI shows:

  1. the flap range
  2. the stall range
  3. the caution range
  4. the normal operating range
Show answer

Answer: D. the normal operating range

From Vs1 to Vno.

Q4The yellow arc on an ASI shows:

  1. the stall range
  2. the normal range
  3. the caution range, to be used only in smooth air
  4. the flap range
Show answer

Answer: C. the caution range, to be used only in smooth air

From Vno to Vne.

Q5The red radial line on the ASI marks:

  1. Vfe
  2. Vs
  3. Vne, the never-exceed speed
  4. Vy
Show answer

Answer: C. Vne, the never-exceed speed

Do not exceed under any condition.

Q6The airspeed indicator error from compressibility is:

  1. ignored
  2. a function of temperature only
  3. added to the CAS to give EAS (subtracted from CAS)
  4. added to the IAS
Show answer

Answer: C. added to the CAS to give EAS (subtracted from CAS)

EAS = CAS − compressibility correction.

Q7The Mach/airspeed indicator displays:

  1. the true airspeed only
  2. Vmo/Mmo with a barber pole pointer
  3. the groundspeed
  4. the vertical speed
Show answer

Answer: B. Vmo/Mmo with a barber pole pointer

Vmo/Mmo is the maximum operating speed.

Q8The barber pole (red and white striped) pointer in a Mach/ASI indicates:

  1. Vmo/Mmo
  2. Vfe
  3. Vs
  4. V1
Show answer

Answer: A. Vmo/Mmo

It moves with altitude as the limit changes between Vmo and Mmo.

Q9The airspeed indicator reading corrected for instrument and position error is:

  1. equivalent airspeed
  2. calibrated airspeed (CAS)
  3. true airspeed
  4. Mach number
Show answer

Answer: B. calibrated airspeed (CAS)

IAS → CAS → EAS → TAS.

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More DGCA Technical General topics

Aerodynamics & Performance181 QFlight Controls & Stability38 QAirframe & Structures25 QPowerplant79 QPropellers32 QAircraft Systems116 QPitot Statics35 QBarometric Altimeters61 QRadio Altimeters37 QVertical Speed Indicators (VSI)32 QAirspeeds41 QMach55 QGyroscope52 QAttitude Indicators20 QTurn and Slip50 QINS, IRS and FMS32 QEFIS24 QAutoflight23 QFlight Director21 QEICAS / ECAM24 QEngine Instruments29 QTemperature Indicators34 QFuel Systems35 QCompass54 QWarning & Recording Systems33 QTCAS39 Q
All DGCA questionsCPL exam syllabusHow to prepareTechnical General formulas

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