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CPL Test Series
Question Bank
Questions for KW BARO
Answer the following questions
Test Mode
Training Mode
1. 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.
A sub-scale logarithmic function.
An induction pick-off device.
Combination of counters/ pointers.
2. What will happen to the indicated altitude if an aircraft in level flight passes into a warmer air mass?
Over indicate.
Not change.
Remain constant only if above the tropopause.
Under indicate.
3. If pressure altitude is 30000 ft, indicated TAT is - 10, mach number is 0.82, what is the density altitude?
30573 ft.
30674 ft.
30472 ft.
31000 ft.
4. Barometric altimeter readings can become erratic during landing because?
Static pressure is changed by ground effect.
Static ports can become blocked by debris.
The air is warmer close to the ground so dynamic pressure changes.
Static ports become shielded by other parts of the aircraft at high angles of attack.
5. If QNH changes from 1013 hPa to 1022 hPa this will?
Not affect field elevation.
Increase field elevation.
Decrease QFE.
Decrease field elevation.
6. 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.
One will under read at high airspeeds.
The ADC will compensate automatically, so both with read correctly.
one will under read close to the ground.
7. A barometric altimeter comprises of ?
An aneroid capsule sensing static pressure.
An aneroid capsule sensing pilot pressure.
A differential capsule sensing pilot and static pressures.
A bellows sensing temperature and static pressures.
8. How will altimeter reading be affected if the static vent pipe becomes blocked?
Read higher than true.
Read lower than true.
Readings will freeze.
Read true altitude, only the air above matters.
9. A servo altimeter is ..... than a conventional one, because ...... ?
More accurate electrical pick-off coils.
Less accurate electric servos.
More accurate electrical servos.
Less accurate Electrical pick-off colls.
10. What will happen to the altimeter reading if an aircraft flying at a fixed heading meets a colder air mass?
Read zero.
Read less than true altitude.
Read more than true altitude.
Readings will not be affected.
11. If pressure altitude is 3700 ft amsl and QNH is 1000 mb, what is field elevation?
490
3310
3210
390
12. One definition of pressure altitude is?
Altitude indication with QNH set.
Pressure at that height in the standard atmosphere
Altitude indication with QFE set.
Altitude Indication with 1013.25 hPa set.
13. Servo altimeters are more accurate because?
They employ electromagnetic pick-offs.
They employ a vibrator to minimise friction errors.
They sense pressure changes more accurately.
They employ a logarithmic scale.
14. If QNH is 1000 hPa and field elevation is 4500 ft amsl, what is QFE?
163 hPa.
850 hPa.
900 hPa.
-850 hPa.
15. If an aircraft has two altimeters, only one of which is corrected for position error?
At high altitude and high speed the non-corrected altimeter will under indicate.
At high altitude and high speed the non-corrected altimeter will over indicate.
ATC transponder replies will be inaccurate.
At low altitude and low speed the corrected altimeter will over indicate.
16. The pressure altitude of the field can be found by?
From an ADC only.
Setting QFE on the altimeter subscale.
Setting QNH on the altimeter subscale.
Setting 1013 mb on the altimeter subscale.
17. What type of pressure sensor is employed in a barometric altimeter?
Differential capsule.
Bourden tube
Bellows.
Aneroid capsule.
18. If QNH is 999 hpa, what is the pressure altitude at an elevation of 25000 ft?
25300 ft.
25100 ft.
25200 ft.
25400 ft.
19. 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?
-500 ft/min.
-300 ft/min.
-250 ft/min.
-150 ft/min.
20. In a barometric altimeter ....... is fed into the capsule and ...... is fed into the case?
Vacuum static pressure.
Dynamic pressure vacuum.
Static pressure dynamic pressure.
Total pressure static pressure.
21. In a banked turn a barometric altimeter using a single static source?
will over indicate.
Will read zero.
will under indicate.
might over or under indicate, depending on the position of the static source.
22. At a fixed pressure altitude an increase in temperature will?
Increase density but decrease density altitude.
Decrease density but increase density altitude.
Not affect density altitude.
Decrease density altitude.
23. Pressure altitude is?
The altimeter indication when 1013.25 hPa is set on the sub-scale.
The altimeter indication when QFE is set on the sub-scale.
The altimeter indication when QNH is set on the subscale.
The altitude above sea level.
24. The ADC obtains its altitude data from?
The TAT and OAT probes
A radio altimeter.
A barometric static pressure sensor similar to a servo altimeter.
A barometric altimeter.
25. What is the true altitude of an aircraft if its altimeter indicated 16000 ft when the ambient temperature was - 30° C?
16200 ft.
16400 ft.
15400 ft.
15200 ft.
26. What will a cabin altimeter read with QFE set
Field elevation when on the runway.
The same as with QNH set.
Height AGL.
Height above sea level.
27. If the pilot source becomes blocked the barometric altimeter will?
Be unaffected.
Freeze.
Read zero.
Read altitude at which it blocked.
28. What is density altitude?
True altitude.
Pressure altitude corrected for ambient temperature.
Pressure altitude corrected for density changes.
True altitude corrected for density changes.
29. What will happen to altimeter indication if an aircraft in level flight enters a cold front?
No change.
Under indication.
Over indication.
No change above the tropopause.
30. The purpose of the vibrating device of an altimeter is to?
Reduce the hysteresis effect.
Allow damping of the measurement in the unit.
Inform the crew of a failure of the instrument
Reduce the effect of friction in the linkages.
31. 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.
Under read when side slipping.
Over read when side slipping towards the clear source.
Over read when side slipping
32. 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?
Depends on altitude.
Under read.
Over read.
No change.
33. If pressure altitude is 22800 ft, at an elevation of 22000 ft, what is QNH?
985 hPa.
1026 hPa.
1034 hPa.
976 hPa.
34. When flying from a sector of warm air into one of colder air, the altimeter will?
Be just as correct as before.
Under read.
Over read.
Show the actual height above ground.
35. Density altitude is?
Pressure altitude corrected for temperature.
Temperature altitude corrected for density.
Temperature altitude corrected for pressure.
Pressure altitude corrected for density.
36. 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 break the altimeter glass.
Freeze open the windows.
37. If icing or debris cause pressure disturbances at the static source, the effect will be?
Increased position error.
Increased compressibility error.
Increased instrument error.
Decreased altitude indication.
38. Which of the following cause air density to decrease?
Increasing humidity, increasing altitude, decreasing temperature.
Increasing humidity, increasing altitude, increasing temperature.
Increasing humidity, decreasing altitude, increasing temperature.
Decreasing humidity, increasing altitude, decreasing temperature.
39. True altitude is shown from ....... on board an aircraft?
Radio altitude.
Temperature altitude.
Density altitude.
Pressure altitude.
40. From what is true altitude derived?
Density altitude
Difference between total pressure and static pressure.
Pressure altitude.
Temperature altitude.
41. Why are vibrators sometimes fitted in altimeters?
Overcome hysteresis.
Overcome inertia.
Overcome friction.
Reduce lag.
42. The altitude indicated on board an aircraft flying in an atmosphere where all atmosphere layers below the aircraft are warm is?
The same as the real altitude.
Lower than the real altitude.
Higher than the real altitude.
Equal to the standard altitude.
43. What is QNH?
Sea level pressure based on ambient pressure at the airfield.
Sea level pressure.
Sea level pressure in the ISA.
Amblent pressure at the airfield.
44. 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?
Depends on altitude.
Under read.
No change.
Over read.
45. As pressure altitude increases?
Temperature increases.
Temperature decreases then remains constant.
Temperature decreases.
Temperature increases then remains constant.
46. If QFE changes from 1013 hPa to 1022 hPa will?
Not affect QNH.
Increase QNH.
Decrease QNH.
Increase field elevation.
47. If an aircraft flying at constant height over a level surface meets a hotter air mass, the altimeter will?
Indicate lower than true.
Indicate randomly varying altitude.
Indicate higher than true.
Indicate zero.
48. At sea level, on a typical servo altimeter, the tolerance in feet from indicated must?
+/-75 feet.
+/-70 feet.
+/-30 feet.
+/-60 feet.
49. Some altimeters employ vibrators in order to ?
Eliminate instrument error.
Minimise hysteresis.
Minimise inaccuracies due to internal friction.
Provide audible warning of low altitudes.
50. If the glass of a barometric altimeter in a pressurised aircraft becomes cracked and the static ports become blocked , the altimeter will?
Read cabin altitude.
Over read.
Read zero continuously
Under read.
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