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CPL Test Series
Question Bank
Questions for KW PITOT STATIC
Answer the following questions
Test Mode
Training Mode
1. If the static source of an altimeter becomes blocked during a descent the instrument will?
Under-read in a climb and over-read in a descent.
Gradually indicate zero
Over-read in a climb and under-read in a descent.
Under- read.
2. The airspeed Indicator circuit consists of pressure sensors. The pilot tube directly supplies?
The static pressure.
The total pressure
The dynamic pressure.
The total pressure and the static pressure.
3. The error in altimeter readings caused by the variation of the static pressure near the source is known as?
Hysteresis effect.
Barometric error.
Instrument error.
Position pressure error.
4. What inputs are fed to the ADC? 1. AOA. 2.TAT. 3. OAT 4.Dynamic pressure. 5.Static pressure. 6.Pilot pressure. 7.IAS 8. Mach number.
(1), (2), (5), (7).
(1), (2), (5), (6).
(1), (2), (4), (5).
(2), (5), (7), (8).
5. What will happen to the altimeter indications in an aircraft in level flight if the right static vent becomes blocked and the left remains clear?
Under indicate in all conditions.
Over indicate when side slipping right.
Over indicate in all conditions.
Over indicate when side slipping left.
6. From where does the ADC obtain its altitude data?
The time take for a radio signal to rebound from the earth.
Barometric pressure from the pilot probe.
Barometric Information from the static pressure ports.
The difference between pilot and static pressures.
7. A pilot tube covered by ice which blocks the ram air inlet will affect the following instrument(s)?
Vertical speed indicator only.
Altimeter only.
Airspeed indicator only.
Airspeed indicator , altimeter and vertical speed indicator.
8. If the pilot tapping becomes blocked it will affect the operation of? 1. ASI. 2.Altimeter. 3.Radalt. 4.Mach meter. 5. VSI.
1, 4.
1, 2, 3, 4.
1, 2, 4, 5.
1, 5.
9. A blocked pilot probe will affect?
All of the above.
VSI
ASI
Altimeter
10. The operating principle of the vertical speed indicator (VSI) is based on the measurement of the rate of change of ?
Total pressure.
Dynamic pressure.
Static pressure.
Kinetic pressure.
11. The static pressure error of the static vent on which the altimeter is connected varies substantially with the?
Deformation of the aneroid capsule.
Mach number of the aircraft.
Static temperature.
Aircraft altitude.
12. If an aircraft is equipped with one altimeter which is compensated for position error and another altimeter which is not, all other factors being equal?
At high speed the non-compensated altimeter will indicate s lower altitude
There will be no difference between them if the air data computer (ADC) is functioning normally.
At high speed, the non-compensated altimeter will indicate a higher altitude.
ATC will get an erroneous altitude report SSR.
13. If the static tube and drains become blocked?
The altimeter will over indicate.
The altimeter will under or over depending on altitude.
The altimeter will indicate zero.
The altimeter will under indicate.
14. The response time of a vertical speed detector may be increased by adding a?
Bi- metallic strip
Return spring.
Correction based on an accelerometer sensor.
Second calibrated port.
15. After an aircraft has passed through a volcanic cloud which has blocked the total pressure probe inlet of the airspeed indicator, the pilot begins a stabilized descent and finds that the indicated airspeed?
Increases abruptly towards VNE.
Decreases steadily.
Decrease abruptly towards zero.
Increases steadily.
16. On board an aircraft the altitude is measured from the?
Density altitude.
Pressure altitude.
Temperature altitude.
Standard altitude.
17. From the ISA table , the atmospheric pressure at FL 70 in a "standard + 10'' atmosphere is?
942.13 hPa.
644.41 hPa.
1013.25 hPa.
781.85 hPa.
18. A blocked pitot probe will affect?
All of the above.
Mach meter.
VSI.
Altimeter.
19. In case of accidental closing of an aircraft's left static pressure port (rain, birds), the altimeter?
Under reads the altitude.
Keeps on providing reliable reading in all situations.
over reads the altitude in case of a side - slip-slip to the right and displays the correct information during symmetric flight.
Over reads the altitude in case of a sideslip to the left and displays the correct information during symmetric flight.
20. What inputs are fed to the ADC? (1) AOA. (2) TAT. (3) OAT. (4) Dynamic pressure. (5) Static pressure. (6) Total pressure. (7) AC electrical power. (8) Autopilot commands.
(1), (2), (5), (6), (7).
(1), (2), (4), (5), (7).
(1), (2), (4), (5), (7).
(2), (4), (5), (7), (8).
21. If the static source to an airspeed indicator (ASI) becomes blocked during a descent the instrument will?
Under-read.
Continue to indicate the speed applicable to that at the time of the blockage.
Over-read.
Read zero.
22. The pressure measured at the forward facing orifice of a pitot tube is the?
Total pressure plus static pressure.
Dynamic pressure.
Total pressure
Static pressure.
23. If the static vents in an un-pressurised airgraft become blocked?
Only instruments fed from an ADC will function.
Breaking or opening the windows will enable the altimeter to function.
Breaking or opening the windows will enable the ASI to function.
Breaking the front glass will enable the altimeter to functuin.
24. Given : Ts is the static temperature (SAT). Tt is the total temperature (TAT). Kr is the recovery coefficient. M is the Mach number. The total temperature can be expressed approximately by the formula?
Tt = Ts(1-0.2 M²).
Tt = Ts(1+0.2 Kr.M²).
Tt = Ts(1+0.2 M²).
Tt = Ts(1+0.3 Kr.M²).
25. The altimeter consists of one or several aneroid capsules located in a sealed casing. The pressure in the aneroid capsule (i) and casing (ii) are respectively?
(i) Vacuum (or very low pressure) (ii) Static pressure.
(i) Total pressure (ii) Static pressure.
(i) Static pressure at time t (ii) Static pressure at time t -t.
(i) Static pressure (ii) Total pressure
26. The density altitude is?
The altitude of the standard atmosphere on which the density is equal to the actual density of the atmosphere.
The temperature altitude corrected for the difference between the real temperature and the standard temperature.
The pressure altitude corrected for the relative density prevailing at this point.
The pressure altitude corrected for the density of air at this point.
27. If the static source becomes blocked in a descent the ASI will ..... indicate , the VSI will.... indicate and the altimeter will .... indicate?
Under Under under.
Over under over.
Under over over.
Over under under.
28. What will happen to the ASI and mach meter indications in an aircraft IN level flight if the right static vent becomes blocked and the left remains clear?
Both will under indicate when side slipping left.
Both will under indicate when side slipping right.
They will both over indicate.
They will not be affected.
29. In a non-pressurized aircraft, if one or several static pressure ports are damaged, there is an ultimate emergency means for restoring a practically correct static pressure intake?
Slightly opening a window to restore the ambient pressure in the cabin.
Breaking the rate-of climb indicator glass window.
Descending as much as possible in order to fly at a pressure as close to 1013.25 hpa as possible.
Calculating the ambient static pressure, allowing for the altitude and QNH and adjusting the instruments.i
30. During a climb after take-off from a contaminated runway, if the total pressure probe of the airspeed indicator is blocked , the pilot finds that indicated airspeed?
Increases abruptly towards VNE.
Decreases abruptly towards zero.
Increases steadily
Decreases steadily
31. If the static source to an altimeter becomes blocked during a climb, the instrument will?
Gradually return to zero.
Continue to indicate the reading at which the blockage occurred.
Under-read by an amount equivalent to the reading at the time that the instrument became blocked.
Over - read.
32. In An Air Data Computer (ADC), aeroplane altitude is calculated from?
Measurement of elapsed time for a radio signal transmitted to the ground surface and back.
Measurement of absolute barometric pressure from a static source on the fuselage.
Measurement of outside air temperature (OAT).
The difference between absolute and dynamic pressure at the fuselage.
33. Which of the following is correct?
Pitot = Pdys - Pstat
Pitot = Ptot+ Pdys.
Pdys = Ptot - Pitot.
PTot = Pstat + PDys
34. If the pilot tube leaks and the pitot drains are blocked in an unpressurised aircraft?
The altimeter will over indicate.
The altimeter will under indicate.
The ASI will under indicate.
The ASI will over indicate.
35. The vertical speed indicator (VSI) is fed by?
Dynamic pressure
Total pressure.
Differential pressure
Static pressure.
36. If the static slots of a pilot probe become blocked but the pilot tapping remains clear?
ASI indication freezes.
ASI acts in the opposite sense to an altimeter.
ASI indication falls to zero.
ASI acts as an altimeter.
37. What advantages are provided by an ADC, compared to traditional pilot static systems? (1) Instrument lag is reduced or eliminated. (2) Position error is automatically correct for. (3) Compressibility error is automatically for. (4) A large number of instruments can be fed from one ADC. (5) It provides emergency altimeter following main system failure.
(2), (3), (4), (5).
(1), (3), (4), (5).
(1), (2), (3), (4).
38. A blocked static vent will affect?
ASI
VSI
Altimeter
All of the above.
39. If the static vents in an unpressurised aircraft become blocked?
Breaking or opening the windows will enable the ASI function.
Only instruments fed from an ADC will function.
Breaking or opening the windows will enable the altimeter to function.
Breaking the front glass will cause the altimeter to under indicate.
40. Debris on the sides of a pilot probe not blocking the air tappings might cause?
Erratic or inaccurate IAS and altitude readings.
Total loss of VSI indications.
Total loss of Altitude indication.
Total loss of IAS indication.
41. The QNH is by definition the value of the?
Altimeter setting so that the needles indicate zero when the aircraft is on ground at the location for which it is provided.
Atmospheric pressure at the sea level of the location for which it is given.
Altimeter setting so that the needles of the altimeter indicate the altitude of the location for which it is given.
Atmospheric pressure at the level of the ground over flown by the aircraft.
42. The advantages provided by an air data computer to indicate the altitude are? 1. Position/ pressure error correction. 2. Hysteresis error correction. 3. Remote data transmission capability. 4. Capability to feed data to a large number of instruments simultaneously
1, 2, 3, 4.
1, 3, 4.
2, 3, 4.
1, 2, 3.
43. With a pitot probe blocked due to ice build up, the aircraft airspeed indicator will indicate in descent a ?
Constant speed.
Decreasing speed.
Increasing speed.
Fluctuating speed.
44. The pressure altitude is the altitude corresponding?
In ambient atmosphere, to the pressure Ps prevailing at this point.
In standard atmosphere, to the pressure Ps prevailing at this point.
In ambient atmosphere, to the reference pressure Ps.
In standard atmosphere, to the reference pressure Ps.
45. If the static tube and drains become blocked?
The altimeter will under indicate.
The ASI will under indicate.
The ASI will over indicate.
The ASI will indicate zero.
46. Entering ground effect is likely to?
Decrease static pressure but increase pilot pressure.
Decrease position errors.
Decrease pilot pressure but increase static pressure.
Increase position errors.
47. A pilot blockage of both the ram air input and the drain hole with the static port open causes the airspeed indicator to?
Read a little low.
Freeze at zero.
React like an altimeter.
Read a little high.
48. An Air Data Computer (ADC)?
Converts air data measurements given by ATC from the ground in order to provide correct altitude and speed information.
Is an auxiliary system that provides altitude information in the event that the static source is blocked.
Transforms air data measurements into electric Impulses driving servo motors in instruments.
Measure position error in the static system and transmits this information To ATC to provide correct altitude reporting.
49. The altimeter is fed by?
Differential pressure
Dynamic pressure.
Static pressure.
Total pressure.
50. A leak in the pilot total pressure line of a non-pressurized aircraft to an airspeed indicator would cause it to?
Over-read in a climb and under -read in a descent.
Under Read
Under-read in a climb and over -read in a descent.
Over read
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