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CPL Test Series
Question Bank
Questions for KW BARO
Answer the following questions
Test Mode
Training Mode
1. A vibrator is sometimes fitted in an altimeter to?
Overcome gauge parallax error.
Reduce sensing errors.
Reduce instrument errors.
To act as an aural warning.
2. The altimeter of an aircraft with a static pressure source on each side of the fuselage will ...... if one becomes blocked?
Under read when side slipping.
Over read when side slipping
Over read when side slipping towards the blocked source.
Over read when side slipping towards the clear source.
3. If QNH is 1000 hPa and field elevation is 4500 ft amsl, what is QFE?
-850 hPa.
850 hPa.
900 hPa.
163 hPa.
4. Some altimeters employ vibrators in order to ?
Provide audible warning of low altitudes.
Minimise inaccuracies due to internal friction.
Minimise hysteresis.
Eliminate instrument error.
5. What is QNH?
Sea level pressure.
Sea level pressure based on ambient pressure at the airfield.
Sea level pressure in the ISA.
Amblent pressure at the airfield.
6. 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.
No change.
Over read.
Under read.
7. True altitude is shown from ....... on board an aircraft?
Pressure altitude.
Radio altitude.
Temperature altitude.
Density altitude.
8. 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.
-300 ft/min.
-250 ft/min.
-500 ft/min.
9. If QFE is 1022 hPa what is the pressure altitude of the field?
30660 ft amsl.
-270 ft amsl.
270 ft amsl.
500 ft amsl.
10. What will happen to the altimeter reading if an aircraft flying at a fixed heading meets a colder air mass?
Read less than true altitude.
Read zero.
Read more than true altitude.
Readings will not be affected.
11. The pressure altitude of the field can be found by?
Setting 1013 mb on the altimeter subscale.
From an ADC only.
Setting QFE on the altimeter subscale.
Setting QNH on the altimeter subscale.
12. When flying from a sector of warm air into one of colder air, the altimeter will?
Show the actual height above ground.
Be just as correct as before.
Over read.
Under read.
13. What is QNH?
Ambient pressure at msl.
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.
The pressure to be set on the altimeter subscale to obtain density altitude when on the runway.
14. What is density altitude?
True altitude corrected for density changes.
True altitude.
Pressure altitude corrected for ambient temperature.
Pressure altitude corrected for density changes.
15. If an aircraft with two static ports, sideslips towards the unblocked port, the altitude indication will?
Increase or decrease depending on sideslip angle.
Increase
Remain unchanged.
Decrease
16. Why are vibrators sometimes fitted in altimeters?
Overcome friction.
Overcome hysteresis.
Overcome inertia.
Reduce lag.
17. If pressure altitude is 22800 ft, at an elevation of 22000 ft, what is QNH?
1034 hPa.
1026 hPa.
976 hPa.
985 hPa.
18. Density altitude is?
The elevation at which the existing density would occur in the ISA.
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.
19. In a banked turn a barometric altimeter using a single static source?
will under indicate.
Will read zero.
will over indicate.
might over or under indicate, depending on the position of the static source.
20. One definition of pressure altitude is?
Altitude indication with QNH set.
Pressure at that height in the standard atmosphere
Altitude Indication with 1013.25 hPa set.
Altitude indication with QFE set.
21. If field pressure altitude is 5000 ft amsl and OAT is 25°C, what is the density altitude?
5000-118(25+(15+(5x1.98)))= 10888.2 ft.
5000+118(25-(15-(5x1.98)))=7348.2 ft.
5000+118(25-(15-(5x1.98)))= 8551.8 ft.
5000-118(25-(15+(5x1.98)))= 4988.2 ft.
22. If the pressure feed line to a barometric altimeter becomes detached from the back of the instrument in flight the instrument will?
Under read.
Over read.
Read zero continuously.
Read cabin altitude.
23. A servo altimeter is ...... it employs an electrical pick-off?
Less accurate because........
More reliable because......
Less reliable because......
More accurate because.......
24. A servo altimeter is ..... than a conventional one, because ...... ?
More accurate electrical pick-off coils.
Less accurate electric servos.
Less accurate Electrical pick-off colls.
More accurate electrical servos.
25. Servo altimeters are more accurate because?
They employ electromagnetic pick-offs.
They sense pressure changes more accurately.
They employ a logarithmic scale.
They employ a vibrator to minimise friction errors.
26. What type of pressure sensor is employed in a barometric altimeter?
Differential capsule.
Aneroid capsule.
Bellows.
Bourden tube
27. 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 over indicate.
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.
28. Density altitude is?
Pressure altitude corrected for density.
Temperature altitude corrected for pressure.
Temperature altitude corrected for density.
Pressure altitude corrected for temperature.
29. True altitude is obtained from ....... on board an aircraft?
Pressure altitude
Density altitude.
International standard altitude.
Temperature altitude.
30. What is the true altitude of an aircraft if its altimeter indicated 16000 ft when the ambient temperature was - 30° C?
15400 ft.
16200 ft.
15200 ft.
16400 ft.
31. 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
32. If QNH changes from 1013 hPa to 1022 hPa this will?
Increase field elevation.
Decrease QFE.
Not affect field elevation.
Decrease field elevation.
33. The primary factor which makes the servo-assisted altimeter more accurate than the simple pressure altimeter is the use of?
Combination of counters/ pointers.
A sub-scale logarithmic function.
More effective temperature compensating leaf springs.
An induction pick-off device.
34. 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
35. A barometric altimeter comprises of ?
An aneroid capsule sensing pilot pressure.
An aneroid capsule sensing static pressure.
A bellows sensing temperature and static pressures.
A differential capsule sensing pilot and static pressures.
36. If field elevation is 3500 ft amsl and QFE is 1020 mb, what is the pressure altitude?
3290
210
-210
3710
37. 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 true altitude, only the air above matters.
Read higher than true
Read zero
38. 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.
39. If pressure altitude is 30000 ft, indicated TAT is - 10, mach number is 0.82, what is the density altitude?
31000 ft.
30472 ft.
30674 ft.
30573 ft.
40. What will happen to altimeter indication if an aircraft in level flight enters a cold front?
Under indication.
No change above the tropopause.
No change.
Over indication.
41. If icing or debris cause pressure disturbances at the static source, the effect will be?
Increased position error.
Decreased altitude indication.
Increased instrument error.
Increased compressibility error.
42. At sea level, on a typical servo altimeter, the tolerance in feet from indicated must?
+/-75 feet.
+/-60 feet.
+/-30 feet.
+/-70 feet.
43. How will altimeter reading be affected if the static vent pipe becomes blocked?
Read lower than true.
Readings will freeze.
Read true altitude, only the air above matters.
Read higher than true.
44. The hysteresis error of an altimeter varles substantially with the?
Aircraft altitude.
Mach number of the aircraft.
Static temperature.
Time passed at a given altitude.
45. If pressure altitude is 3700 ft amsl and QNH is 1000 mb, what is field elevation?
3210
490
390
3310
46. From what is true altitude derived?
Difference between total pressure and static pressure.
Temperature altitude.
Density altitude
Pressure altitude.
47. If QFE changes from 1013 hPa to 1022 hPa will?
Not affect QNH.
Increase field elevation.
Increase QNH.
Decrease QNH.
48. What will happen to the indicated altitude if an aircraft in level flight passes into a warmer air mass?
Over indicate.
Not change.
Under indicate.
Remain constant only if above the tropopause.
49. If QNH is 999 hpa, what is the pressure altitude at an elevation of 25000 ft?
25200 ft.
25400 ft.
25100 ft.
25300 ft.
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.
Read zero continuously
Under read.
Over read.
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