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CPL Test Series
Question Bank
Questions for KW BARO
Answer the following questions
Test Mode
Training Mode
1. If an aircraft flying at constant height over a level surface meets a hotter air mass, the altimeter will?
Indicate zero.
Indicate randomly varying altitude.
Indicate lower than true.
Indicate higher than true.
2. 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.
No change.
Over read.
3. If field elevation is 3500 ft amsl and QFE is 1020 mb, what is the pressure altitude?
3290
3710
-210
210
4. If QNH changes from 1013 hPa to 1022 hPa this will?
Not affect field elevation.
Decrease field elevation.
Increase field elevation.
Decrease QFE.
5. At a fixed pressure altitude an increase in temperature will?
Decrease density but increase density altitude.
Decrease density altitude.
Not affect density altitude.
Increase density but decrease density altitude.
6. 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.
7. What type of pressure sensor is employed in a barometric altimeter?
Differential capsule.
Aneroid capsule.
Bourden tube
Bellows.
8. The pressure altitude of the field can be found by?
Setting QFE on the altimeter subscale.
From an ADC only.
Setting 1013 mb on the altimeter subscale.
Setting QNH on the altimeter subscale.
9. If the pilot source becomes blocked the barometric altimeter will?
Freeze.
Read zero.
Read altitude at which it blocked.
Be unaffected.
10. In a barometric altimeter ....... is fed into the capsule and ...... is fed into the case?
Static pressure dynamic pressure.
Total pressure static pressure.
Vacuum static pressure.
Dynamic pressure vacuum.
11. 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.
Higher than the real altitude.
Lower than the real altitude.
The same as the real altitude.
12. If pressure altitude is 22800 ft, at an elevation of 22000 ft, what is QNH?
1034 hPa.
1026 hPa.
985 hPa.
976 hPa.
13. A servo altimeter is ..... than a conventional one, because ...... ?
Less accurate Electrical pick-off colls.
Less accurate electric servos.
More accurate electrical pick-off coils.
More accurate electrical servos.
14. The ADC obtains its altitude data from?
A barometric static pressure sensor similar to a servo altimeter.
A radio altimeter.
The TAT and OAT probes
A barometric altimeter.
15. If pressure altitude is 3700 ft amsl and QNH is 1000 mb, what is field elevation?
3310
490
3210
390
16. If icing or debris cause pressure disturbances at the static source, the effect will be?
Increased compressibility error.
Increased instrument error.
Increased position error.
Decreased altitude indication.
17. One definition of pressure altitude is?
Altitude Indication with 1013.25 hPa set.
Pressure at that height in the standard atmosphere
Altitude indication with QNH set.
Altitude indication with QFE set.
18. Servo altimeters are more accurate because?
They employ electromagnetic pick-offs.
They employ a logarithmic scale.
They employ a vibrator to minimise friction errors.
They sense pressure changes more accurately.
19. A servo altimeter is ...... it employs an electrical pick-off?
Less reliable because......
More accurate because.......
More reliable because......
Less accurate because........
20. Why are vibrators sometimes fitted in altimeters?
Overcome hysteresis.
Overcome friction.
Reduce lag.
Overcome inertia.
21. How will altimeter reading be affected if the static vent pipe becomes blocked?
Read higher than true.
Readings will freeze.
Read lower than true.
Read true altitude, only the air above matters.
22. Density altitude is?
Temperature altitude corrected for density.
Temperature altitude corrected for pressure.
Pressure altitude corrected for density.
Pressure altitude corrected for temperature.
23. If the pressure feed line to a barometric altimeter becomes detached from the back of the instrument in flight the instrument will?
Read zero continuously.
Read cabin altitude.
Under read.
Over read.
24. What will happen to the indicated altitude if an aircraft in level flight passes into a warmer air mass?
Remain constant only if above the tropopause.
Not change.
Under indicate.
Over indicate.
25. What is the true altitude of an aircraft flying at 16000 ft indicated altitude with an OAT of -16 degrees C?
14200 ft
16200 ft
13200 ft
16050 ft
26. From what is true altitude derived?
Density altitude
Difference between total pressure and static pressure.
Temperature altitude.
Pressure altitude.
27. The hysteresis error of an altimeter varles substantially with the?
Static temperature.
Aircraft altitude.
Mach number of the aircraft.
Time passed at a given altitude.
28. 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.
-250 ft/min.
-500 ft/min.
-300 ft/min.
29. What will happen if an aircraft has two altimeters, one of which is compensated for position error, whilst the other is not?
one will under read close to the ground.
one will over read at high airspeeds.
One will under read at high airspeeds.
The ADC will compensate automatically, so both with read correctly.
30. 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.
31. From where does the ADC obtain altitude data?
OAT sources
Radio Altimeter.
Dynamic minus total pressure.
Barometric altitude source.
32. If an aircraft has two altimeters, only one of which is corrected for position error?
At low altitude and low speed the corrected altimeter will over indicate.
At high altitude and high speed the non-corrected altimeter will over indicate.
At high altitude and high speed the non-corrected altimeter will under indicate.
ATC transponder replies will be inaccurate.
33. 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.
Over read.
No change.
34. If the static vent becomes partly blocked in a descent the indications will?
Be too high when descending but correct when at constant height.
Be too low when descending but correct when at constant height.
Be too high when descending but correct when at constant altitude.
Be too low when descending but correct when at constant altitude.
35. At sea level, on a typical servo altimeter, the tolerance in feet from indicated must?
+/-60 feet.
+/-70 feet.
+/-75 feet.
+/-30 feet.
36. If an aircraft with two static ports, sideslips towards the blocked port, the altitude indication will?
Remain unchanged.
Increase.
Increase or decrease depending on sideslip angle.
Decrease.
37. True altitude is obtained from ....... on board an aircraft?
Density altitude.
International standard altitude.
Temperature altitude.
Pressure altitude
38. A vibrator is sometimes fitted in an altimeter to?
Reduce instrument errors.
Overcome gauge parallax error.
Reduce sensing errors.
To act as an aural warning.
39. The purpose of the vibrating device of an altimeter is to?
Allow damping of the measurement in the unit.
Reduce the hysteresis effect.
Reduce the effect of friction in the linkages.
Inform the crew of a failure of the instrument
40. As pressure altitude increases?
Temperature increases.
Temperature decreases.
Temperature increases then remains constant.
Temperature decreases then remains constant.
41. Some altimeters employ vibrators in order to ?
Minimise hysteresis.
Provide audible warning of low altitudes.
Minimise inaccuracies due to internal friction.
Eliminate instrument error.
42. 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.
43. How will altimeter readings be affected if the layers of air below an aircraft are colder than the standard temperature?
Read lower than true.
Read zero
Read higher than true
Read true altitude, only the air above matters.
44. What is QNH?
Amblent pressure at the airfield.
Sea level pressure based on ambient pressure at the airfield.
Sea level pressure.
Sea level pressure in the ISA.
45. True altitude is shown from ....... on board an aircraft?
Temperature altitude.
Density altitude.
Radio altitude.
Pressure altitude.
46. If an aircraft with two static ports, sideslips towards the unblocked port, the altitude indication will?
Increase
Increase or decrease depending on sideslip angle.
Remain unchanged.
Decrease
47. What will a cabin altimeter read with QFE set
Height above sea level.
The same as with QNH set.
Field elevation when on the runway.
Height AGL.
48. Which of the following cause air density to decrease?
Increasing humidity, decreasing altitude, increasing temperature.
Increasing humidity, increasing altitude, decreasing temperature.
Decreasing humidity, increasing altitude, decreasing temperature.
Increasing humidity, increasing altitude, increasing temperature.
49. If QNH is 999 hpa, what is the pressure altitude at an elevation of 25000 ft?
25100 ft.
25300 ft.
25400 ft.
25200 ft.
50. What will happen to the altimeter reading if an aircraft flying at a fixed heading meets a colder air mass?
Read zero.
Readings will not be affected.
Read more than true altitude.
Read less than true altitude.
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