DGCA Air Navigation: Vertical Speed Indicator Questions
28 exam-style Vertical Speed Indicator 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.
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Q1
The alternate static source in a light non-pressurised aircraft is In the flight deck. As the alternate source is opened, the vertical indicator may:
- A Indicate a high rate of descent
- B Indicate a slight momentary descent.
- C Indicate a momentary climb.
- D Be blocked,
Show answer
Correct answer: C. Indicate a momentary climb.
Lower cabin static pressure makes the VSI give a momentary climb indication.
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Q2
If the pitot pipe becomes partly blocked?
- A The VSI indication will be too low when climbing.
- B The VSI will be too low when descending.
- C The VSI will not be affected.
- D The VSI will be too low when descending and too high when climbing.
Show answer
Correct answer: C. The VSI will not be affected.
The VSI uses only static pressure, so a blocked pitot does not affect it.
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Q3
If the static pipe becomes partly blocked?
- A The VSI indication will be too high when descending.
- B The VSI indication will be too high when accelerating.
- C The VSI indication will be too low when climbing or descending.
- D The VSI indication will be unaffected.
Show answer
Correct answer: C. The VSI indication will be too low when climbing or descending.
Partial static blockage lag makes the VSI under-read in both climb and descent.
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Q4
VSI lag is reduced by?
- A Two dash pots responding to acceleration.
- B Two return springs.
- C Bi-metallic strips,
- D Electronic systems.
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Correct answer: A. Two dash pots responding to acceleration.
Instantaneous VSIs use dashpot accelerometer pumps to reduce lag.
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Q5
In an inertial-lead VSI the source of the most pronounced error is:
- A Instrument
- B Position
- C Steep turn
- D Missed approach manoeuver
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Correct answer: C. Steep turn
This Explanation is Coming Soon
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Q6
If the choke In the VSI becomes partly blacked?
- A The VSI indication will be too high when climbing.
- B The VSI indication will be too low when descending.
- C The VSI indication will be too high at all times.
- D The VSI indication will be too high when climbing or descending.
Show answer
Correct answer: D. The VSI indication will be too high when climbing or descending.
A partly blocked metering choke makes the VSI over-read in both climb and descent.
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Q7
The correct action to be taken when the static vent blocks on an unpressurised aircraft Is to?
- A Break the VSI glass.
- B Use the standby static source.
- C Calculate ROC using mathematically.
- D Open a window to equalize pressures.
Show answer
Correct answer: B. Use the standby static source.
The correct action is to select the standby (alternate) static source.
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Q8
A VSI?
- A Produces an output proportional to ambient pressure.
- B Measures the difference between total pressure and static pressure.
- C Measures the difference between the pressure inside and outside a capsule.
- D Measures only dynamic pressure.
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Correct answer: C. Measures the difference between the pressure inside and outside a capsule.
A VSI measures the pressure difference between inside and outside its capsule.
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Q9
As an aircraft moves close to the ground during a landing the VSI might?
- A Become inaccurate due to ground effect.
- B Become inaccurate due to turbulence.
- C Stick due to loss of pitot source.
- D Become inaccurate due to aircraft attitude changes.
Show answer
Correct answer: A. Become inaccurate due to ground effect.
Near the ground, ground effect on the static source can make the VSI inaccurate.
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Q10
What should the VSI indicate when an aircraft on a 3 degree glide slope is flying at 100 Kts TAS?
- A 224 fpm descent
- B 324 fpm descent.
- C 424 fpm descent.
- D 524 fpm descent.
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Correct answer: D. 524 fpm descent.
At 100 kt on a 3-degree slope the descent rate is about 524 fpm (five times groundspeed).
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Q11
The response rate of a VSI can be improved by fitting a?
- A Accelerometer system.
- B Choke system.
- C Bi-metalic compensator.
- D Return spring.
Show answer
Correct answer: A. Accelerometer system.
An accelerometer (IVSI) system improves VSI response rate.
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Q12
During a missed approach and go-around procedure the change of aircraft attitude plus raising of the landing gear and changing of flap settings can cause short term unpredictable errors in certain instruments. The instruments most likely to be affected in this case are:
- A the altimeter, artificial horizon and vertical speed indicator.
- B the airspeed indicator, machmeter and vertical speed indicator.
- C the machmeter, airspeed indicator, altimeter and vertical speed indicator
- D the vertical speed indicator, airspeed indicator and altimeter.
Show answer
Correct answer: D. the vertical speed indicator, airspeed indicator and altimeter.
This Explanation is Coming Soon
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