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CPL Test Series
Question Bank
Questions for R* B*L* VSI
Answer the following questions
Test Mode
Training Mode
1. If the casing of VSI in a pressurized a/c develops a leak, VSI indications will be
Too high when climbing and too low when descending. In pressurized a/c, there is extra pressure coming in the static chamber. So, the capsule will contract and it will show rate of climb very high. This extra pressure will also effect rate of descend, which will be shown too low because of extra pressure. It will show rate of climb even in level flight
Too high when climbing or descending
Too low when climbing or descending
2. The vertical speed indicator of an aircraft flying at a true airspeed of 100kt, in a descent with a slope of 3 degrees, indicates
-300ft/min
-500ft/min
-250ft/min
3. A/C fitted with IVSI will have
Will show correct during turns: Drawbacks: (i) It shows climb during turn (ii) During turbulence it shows oscillation
Climbing indications during turn
Descend indications during turn
4. A VSI?
Produces an output proportional to ambient pressure
Measures the difference between total pressure and static pressure
Measures the difference between the pressure inside and outside a capsule
5. A VSI indicates increasing ROD by?
VSI needle stationary
VSI needle moving upwards
VSI needle moving downwards
6. What does a vertical speed indicator actually measure?
The rate of temperature change
The rate of pressure change
The rate of temperature and altitude change
7. If the static pipe becomes partly blocked?
The VSI indication will be too high when accelerating
The VSI indication will be too high when descending
The VSI indication will be too low when climbing or descending
8. If the pilot pipe becomes partly blocked?
The VSI indication will be too low when climbing
The VSI will be too low when descending
The VSI will not be affected
9. If casing of VSI in an unpressurized a/c develops a leak
It will under read
It will read zero. If there is a leak, pressure will quickly equalize with atmospheric pressure in the capsule, so, difference is zero.
It will over read
10. Entering ground effect is likely is?
Decrease static pressure but increase pilot pressure
Decrease pilot pressure but increase static pressure
Increase position errors. After some time pressure will equalize in capsule and sealed casing. It will show zero in level, climb and descend
11. VSI lag is reduced by?
Two return springs
Bi-metallic strips
Two dashpots responding to acceleration
12. The corrected action to be taken when the static vent blocks on an unpressurised aircraft is to?
Calculate ROC using mathematically
Break the VSI glass
Use the standby static source
13. If metered orifice in VSI becomes partly blocked, VSI indication will be
Too low when descending
Too high when climbing/descending
Too high when climbing
14. The response time of a vertical speed detector may be increased by adding a
bimetallic strip
second calibrated pqrt
correction based on an accelometer sensor
15. The vertical speed indicator indications may be in error for some seconds after starting or finishing a climb or descent. The error is a result of
a combination of time lag and manoeuvre induced errors.
a combination of time lag and instrument error
a combination of position error and manoeuvre induced errors
16. During taxing, VSI shows - 100'. Pilot should
Continue with flight if engineer is on board
Taxi back and VSI should be repaired
Continue with flight with new reference. Error can be correct with an adjusting screw on the front of the instrument
17. IVSI is more useful over normal VSI as its indications are
Reliable at all times. During turns the piston is pulled out because of centrifugal force and the capsule contracts
More reliable when a/c intimates climb/descend
More reliable during steady climb/descend
18. The vertical speed indicator VSI is fed by
dynamic pressure
static pressure
differential pressure
19. Compared to the VSI what errors are eliminated by the IVSI?
temperature
lag
turning
20. If the static vent becomes blocked during climb
the VSI will indicate an increasing rate of climb
the VSI will indicate a decreasing rate of climb
the VSI will return to zero
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