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CPL Test Series
Question Bank
Questions for KW BARO
Answer the following questions
Test Mode
Training Mode
1. What is the true altitude of an aircraft flying at 16000 ft indicated altitude with an OAT of -16 degrees C?
16050 ft
14200 ft
16200 ft
13200 ft
2. One definition of pressure altitude is?
Pressure at that height in the standard atmosphere
Altitude indication with QFE set.
Altitude Indication with 1013.25 hPa set.
Altitude indication with QNH set.
3. How will altimeter readings be affected if the layers of air below an aircraft are colder than the standard temperature?
Read higher than true
Read true altitude, only the air above matters.
Read zero
Read lower than true.
4. If pressure altitude is 22800 ft, at an elevation of 22000 ft, what is QNH?
985 hPa.
1026 hPa.
1034 hPa.
976 hPa.
5. If the pilot source becomes blocked the barometric altimeter will?
Freeze.
Read altitude at which it blocked.
Be unaffected.
Read zero.
6. What is the true altitude of an aircraft if its altimeter indicated 16000 ft when the ambient temperature was - 30° C?
15200 ft.
16400 ft.
16200 ft.
15400 ft.
7. If QFE is 1022 hPa what is the pressure altitude of the field?
30660 ft amsl.
-270 ft amsl.
500 ft amsl.
270 ft amsl.
8. The purpose of the vibrating device of an altimeter is to?
Inform the crew of a failure of the instrument
Allow damping of the measurement in the unit.
Reduce the hysteresis effect.
Reduce the effect of friction in the linkages.
9. If the glass of a barometric altimeter in a pressurised aircraft becomes cracked and the static ports become blocked , the altimeter will?
Read zero continuously
Over read.
Under read.
Read cabin altitude.
10. If pressure altitude is 3700 ft amsl and QNH is 1000 mb, what is field elevation?
390
3210
490
3310
11. What will happen to the indicated altitude if an aircraft in level flight passes into a warmer air mass?
Under indicate.
Remain constant only if above the tropopause.
Not change.
Over indicate.
12. If QFE changes from 1013 hPa to 1022 hPa will?
Decrease QNH.
Increase field elevation.
Increase QNH.
Not affect QNH.
13. A vibrator is sometimes fitted in an altimeter to?
Reduce instrument errors.
Reduce sensing errors.
Overcome gauge parallax error.
To act as an aural warning.
14. If QNH is 1000 hPa and field elevation is 4500 ft amsl, what is QFE?
-850 hPa.
163 hPa.
900 hPa.
850 hPa.
15. Why are vibrators sometimes fitted in altimeters?
Reduce lag.
Overcome inertia.
Overcome friction.
Overcome hysteresis.
16. What will happen to the altimeter reading in a right sideslip, If an aircraft has a static vent at each side of the fuselage, but the right one is blocked?
Over read.
No change.
Under read.
Depends on altitude.
17. True altitude is obtained from ....... on board an aircraft?
Pressure altitude
International standard altitude.
Temperature altitude.
Density altitude.
18. If the static pressure source in an un- pressurised aircraft became blocked the altimeter would ...... but might be rectified by ........ ?
Read zero open the windows.
Read zero break the altimeter glass.
Freeze open the windows.
Freeze break the altimeter glass.
19. If the static vent becomes partly blocked in a descent the indications will?
Be too low when descending but correct when at constant height.
Be too high when descending but correct when at constant altitude.
Be too high when descending but correct when at constant height.
Be too low when descending but correct when at constant altitude.
20. What will happen to the altimeter reading in a right sideslip, if an aircraft has a static vent at each side of the fuselage, but the left one is blocked?
Under read.
No change.
Over read.
Depends on altitude.
21. Servo altimeters are more accurate because?
They employ a vibrator to minimise friction errors.
They employ a logarithmic scale.
They employ electromagnetic pick-offs.
They sense pressure changes more accurately.
22. If QNH changes from 1013 hPa to 1022 hPa this will?
Decrease field elevation.
Decrease QFE.
Increase field elevation.
Not affect field elevation.
23. The hysteresis error of an altimeter varles substantially with the?
Static temperature.
Mach number of the aircraft.
Time passed at a given altitude.
Aircraft altitude.
24. A servo altimeter is ..... than a conventional one, because ...... ?
Less accurate electric servos.
Less accurate Electrical pick-off colls.
More accurate electrical pick-off coils.
More accurate electrical servos.
25. From what is true altitude derived?
Temperature altitude.
Pressure altitude.
Difference between total pressure and static pressure.
Density altitude
26. Barometric altimeter readings can become erratic during landing because?
Static ports can become blocked by debris.
The air is warmer close to the ground so dynamic pressure changes.
Static pressure is changed by ground effect.
Static ports become shielded by other parts of the aircraft at high angles of attack.
27. If icing or debris cause pressure disturbances at the static source, the effect will be?
Increased compressibility error.
Decreased altitude indication.
Increased instrument error.
Increased position error.
28. What is density altitude?
Pressure altitude corrected for ambient temperature.
True altitude corrected for density changes.
True altitude.
Pressure altitude corrected for density changes.
29. If field elevation is 4000 ft amsl and QNH is 900 mb, what is the pressure altitude?
6390
610
5540
7390
30. The altitude indicated on board an aircraft flying in an atmosphere where all atmosphere layers below the aircraft are warm is?
Equal to the standard altitude.
The same as the real altitude.
Higher than the real altitude.
Lower than the real altitude.
31. What is QNH?
Sea level pressure based on ambient pressure at the airfield.
Sea level pressure in the ISA.
Sea level pressure.
Amblent pressure at the airfield.
32. The pressure altitude of the field can be found by?
From an ADC only.
Setting QNH on the altimeter subscale.
Setting 1013 mb on the altimeter subscale.
Setting QFE on the altimeter subscale.
33. If QNH is 999 hpa, what is the pressure altitude at an elevation of 25000 ft?
25200 ft.
25100 ft.
25300 ft.
25400 ft.
34. What will happen if an aircraft has two altimeters, one of which is compensated for position error, whilst the other is not?
one will over read at high airspeeds.
The ADC will compensate automatically, so both with read correctly.
one will under read close to the ground.
One will under read at high airspeeds.
35. From where does the ADC obtain altitude data?
Dynamic minus total pressure.
Radio Altimeter.
OAT sources
Barometric altitude source.
36. The vertical speed indicator of an aircraft flying at a true airspeed of 100 kt, in a descent with a slope of 3 degrees, indicates?
-150 ft/min.
-500 ft/min.
-300 ft/min.
-250 ft/min.
37. If field elevation is 3500 ft amsl and QFE is 1020 mb, what is the pressure altitude?
210
-210
3710
3290
38. If an aircraft with two static ports, sideslips towards the blocked port, the altitude indication will?
Decrease.
Increase or decrease depending on sideslip angle.
Increase.
Remain unchanged.
39. In a barometric altimeter ....... is fed into the capsule and ...... is fed into the case?
Vacuum static pressure.
Total pressure static pressure.
Static pressure dynamic pressure.
Dynamic pressure vacuum.
40. The altitude indicated on board an aircraft flying in an atmosphere where all the atmosphere layers below the aircraft are cold is?
The same as the real altitude.
Equal to the standard altitude.
Lower than the real altitude.
Higher than the real altitude.
41. What type of pressure sensor is employed in a barometric altimeter?
Bourden tube
Bellows.
Differential capsule.
Aneroid capsule.
42. The ADC obtains its altitude data from?
A barometric static pressure sensor similar to a servo altimeter.
A barometric altimeter.
A radio altimeter.
The TAT and OAT probes
43. True altitude is shown from ....... on board an aircraft?
Radio altitude.
Temperature altitude.
Pressure altitude.
Density altitude.
44. The primary factor which makes the servo-assisted altimeter more accurate than the simple pressure altimeter is the use of?
More effective temperature compensating leaf springs.
An induction pick-off device.
Combination of counters/ pointers.
A sub-scale logarithmic function.
45. If an aircraft flying at constant height over a level surface meets a hotter air mass, the altimeter will?
Indicate lower than true.
Indicate higher than true.
Indicate zero.
Indicate randomly varying altitude.
46. When flying from a sector of warm air into one of colder air, the altimeter will?
Over read.
Under read.
Be just as correct as before.
Show the actual height above ground.
47. The altimeter of an aircraft with a static pressure source on each side of the fuselage will ...... if one becomes blocked?
Over read when side slipping towards the blocked source.
Over read when side slipping towards the clear source.
Over read when side slipping
Under read when side slipping.
48. At sea level, on a typical servo altimeter, the tolerance in feet from indicated must?
+/-30 feet.
+/-75 feet.
+/-70 feet.
+/-60 feet.
49. At a fixed pressure altitude an increase in temperature will?
Decrease density but increase density altitude.
Not affect density altitude.
Increase density but decrease density altitude.
Decrease density altitude.
50. Pressure altitude is?
The altimeter indication when QNH is set on the subscale.
The altimeter indication when QFE is set on the sub-scale.
The altitude above sea level.
The altimeter indication when 1013.25 hPa is set on the sub-scale.
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