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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 with two static ports, sideslips towards the unblocked port, the altitude indication will?
Increase
Decrease
Remain unchanged.
Increase or decrease depending on sideslip angle.
2. If QFE changes from 1013 hPa to 1022 hPa will?
Decrease QNH.
Not affect QNH.
Increase QNH.
Increase field elevation.
3. What is the true altitude of an aircraft if its altimeter indicated 16000 ft when the ambient temperature was - 30° C?
15400 ft.
16400 ft.
15200 ft.
16200 ft.
4. A servo altimeter is ..... than a conventional one, because ...... ?
Less accurate electric servos.
More accurate electrical servos.
More accurate electrical pick-off coils.
Less accurate Electrical pick-off colls.
5. If pressure altitude is 3700 ft amsl and QNH is 1000 mb, what is field elevation?
3310
3210
390
490
6. True altitude is shown from ....... on board an aircraft?
Temperature altitude.
Density altitude.
Radio altitude.
Pressure altitude.
7. 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.
Freeze break the altimeter glass.
Freeze open the windows.
Read zero break the altimeter glass.
8. If the glass of a barometric altimeter in a pressurised aircraft becomes cracked and the static ports become blocked , the altimeter will?
Under read.
Read cabin altitude.
Read zero continuously
Over read.
9. The pressure altitude of the field can be found by?
Setting QFE on the altimeter subscale.
Setting 1013 mb on the altimeter subscale.
Setting QNH on the altimeter subscale.
From an ADC only.
10. The hysteresis error of an altimeter varles substantially with the?
Time passed at a given altitude.
Aircraft altitude.
Static temperature.
Mach number of the aircraft.
11. 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.
-250 ft/min.
-150 ft/min.
-300 ft/min.
12. A barometric altimeter comprises of ?
An aneroid capsule sensing static pressure.
A differential capsule sensing pilot and static pressures.
An aneroid capsule sensing pilot pressure.
A bellows sensing temperature and static pressures.
13. Barometric altimeter readings can become erratic during landing because?
Static ports can become blocked by debris.
Static pressure is changed by ground effect.
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.
14. From where does the ADC obtain altitude data?
Dynamic minus total pressure.
Radio Altimeter.
OAT sources
Barometric altitude source.
15. What is QNH?
Amblent pressure at the airfield.
Sea level pressure.
Sea level pressure based on ambient pressure at the airfield.
Sea level pressure in the ISA.
16. What is the true altitude of an aircraft flying at 16000 ft indicated altitude with an OAT of -16 degrees C?
16050 ft
16200 ft
13200 ft
14200 ft
17. What will happen to the indicated altitude if an aircraft in level flight passes into a warmer air mass?
Under indicate.
Not change.
Remain constant only if above the tropopause.
Over indicate.
18. 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 clear source.
Under read when side slipping.
Over read when side slipping towards the blocked source.
Over read when side slipping
19. How will altimeter readings be affected if the layers of air below an aircraft are colder than the standard temperature?
Read zero
Read lower than true.
Read higher than true
Read true altitude, only the air above matters.
20. Servo altimeters are more accurate because?
They employ electromagnetic pick-offs.
They employ a logarithmic scale.
They sense pressure changes more accurately.
They employ a vibrator to minimise friction errors.
21. What is QNH?
The pressure to be set on the altimeter subscale to obtain density altitude when on the runway.
The pressure to be set on the altimeter subscale to obtain a reading of the pressure altitude of the runway.
The pressure to be set on the altimeter subscale to obtain an indication of zero on the runway.
Ambient pressure at msl.
22. If QNH is 999 hpa, what is the pressure altitude at an elevation of 25000 ft?
25100 ft.
25400 ft.
25200 ft.
25300 ft.
23. The ADC obtains its altitude data from?
A barometric static pressure sensor similar to a servo altimeter.
The TAT and OAT probes
A radio altimeter.
A barometric altimeter.
24. A vibrator is sometimes fitted in an altimeter to?
To act as an aural warning.
Overcome gauge parallax error.
Reduce instrument errors.
Reduce sensing errors.
25. What will happen to altimeter indication if an aircraft in level flight enters a cold front?
Over indication.
No change.
Under indication.
No change above the tropopause.
26. One definition of pressure altitude is?
Pressure at that height in the standard atmosphere
Altitude indication with QNH set.
Altitude indication with QFE set.
Altitude Indication with 1013.25 hPa set.
27. Density altitude is?
The density at which the existing temperature would occur in the ISA.
The altitude at which the existing density would occur in the ISA.
The pressure altitude corrected for density deviation.
The elevation at which the existing density would occur in the ISA.
28. If pressure altitude is 22800 ft, at an elevation of 22000 ft, what is QNH?
976 hPa.
1034 hPa.
985 hPa.
1026 hPa.
29. How will altimeter reading be affected if the static vent pipe becomes blocked?
Readings will freeze.
Read true altitude, only the air above matters.
Read higher than true.
Read lower than true.
30. 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?
No change.
Depends on altitude.
Under read.
Over read.
31. If QFE is 1022 hPa what is the pressure altitude of the field?
500 ft amsl.
30660 ft amsl.
-270 ft amsl.
270 ft amsl.
32. If the pressure feed line to a barometric altimeter becomes detached from the back of the instrument in flight the instrument will?
Over read.
Under read.
Read cabin altitude.
Read zero continuously.
33. At sea level, on a typical servo altimeter, the tolerance in feet from indicated must?
+/-30 feet.
+/-60 feet.
+/-75 feet.
+/-70 feet.
34. Density altitude is?
Pressure altitude corrected for temperature.
Temperature altitude corrected for pressure.
Pressure altitude corrected for density.
Temperature altitude corrected for density.
35. What type of pressure sensor is employed in a barometric altimeter?
Bourden tube
Aneroid capsule.
Differential capsule.
Bellows.
36. If the static vent becomes partly blocked in a descent the indications will?
Be too low 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 height.
Be too high when descending but correct when at constant altitude.
37. If the pilot source becomes blocked the barometric altimeter will?
Read zero.
Read altitude at which it blocked.
Be unaffected.
Freeze.
38. 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.
39. 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?
No change.
Depends on altitude.
Under read.
Over read.
40. If QNH changes from 1013 hPa to 1022 hPa this will?
Decrease field elevation.
Not affect field elevation.
Increase field elevation.
Decrease QFE.
41. If pressure altitude is 30000 ft, indicated TAT is - 10, mach number is 0.82, what is the density altitude?
30573 ft.
30472 ft.
30674 ft.
31000 ft.
42. 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 less than true altitude.
Read more than true altitude.
43. Which of the following cause air density to decrease?
Increasing humidity, decreasing altitude, increasing temperature.
Decreasing humidity, increasing altitude, decreasing temperature.
Increasing humidity, increasing altitude, increasing temperature.
Increasing humidity, increasing altitude, decreasing temperature.
44. As pressure altitude increases?
Temperature decreases then remains constant.
Temperature increases then remains constant.
Temperature decreases.
Temperature increases.
45. The primary factor which makes the servo-assisted altimeter more accurate than the simple pressure altimeter is the use of?
A sub-scale logarithmic function.
More effective temperature compensating leaf springs.
An induction pick-off device.
Combination of counters/ pointers.
46. If field elevation is 3500 ft amsl and QFE is 1020 mb, what is the pressure altitude?
3710
-210
3290
210
47. If icing or debris cause pressure disturbances at the static source, the effect will be?
Decreased altitude indication.
Increased compressibility error.
Increased position error.
Increased instrument error.
48. If an aircraft has two altimeters, only one of which is corrected for position error?
ATC transponder replies will be inaccurate.
At low altitude and low speed the corrected altimeter will over indicate.
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.
49. Some altimeters employ vibrators in order to ?
Minimise hysteresis.
Provide audible warning of low altitudes.
Minimise inaccuracies due to internal friction.
Eliminate instrument error.
50. True altitude is obtained from ....... on board an aircraft?
International standard altitude.
Temperature altitude.
Pressure altitude
Density altitude.
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