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CPL Test Series
Question Bank
Questions for KW PITOT STATIC
Answer the following questions
Test Mode
Training Mode
1. An Air Data Computer (ADC)?
Is an auxiliary system that provides altitude information in the event that the static source is blocked.
Converts air data measurements given by ATC from the ground in order to provide correct altitude and speed information.
Measure position error in the static system and transmits this information To ATC to provide correct altitude reporting.
Transforms air data measurements into electric Impulses driving servo motors in instruments.
2. If the pilot tapping becomes blocked it will affect the operation of? 1. ASI. 2.Altimeter. 3.Radalt. 4.Mach meter. 5. VSI.
1, 2, 3, 4.
1, 2, 4, 5.
1, 4.
1, 5.
3. In case of accidental closing of an aircraft's left static pressure port (rain, birds), the altimeter?
Keeps on providing reliable reading in all situations.
Over reads the altitude in case of a sideslip to the left and displays the correct information during symmetric flight.
over reads the altitude in case of a side - slip-slip to the right and displays the correct information during symmetric flight.
Under reads the altitude.
4. In An Air Data Computer (ADC), aeroplane altitude is calculated from?
The difference between absolute and dynamic pressure at the fuselage.
Measurement of outside air temperature (OAT).
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.
5. The error in altimeter readings caused by the variation of the static pressure near the source is known as?
Hysteresis effect.
Instrument error.
Position pressure error.
Barometric error.
6. If the static source to an airspeed indicator (ASI) becomes blocked during a descent the instrument will?
Over-read.
Under-read.
Read zero.
Continue to indicate the speed applicable to that at the time of the blockage.
7. If the static vents in an un-pressurised airgraft become blocked?
Breaking or opening the windows will enable the ASI to function.
Only instruments fed from an ADC will function.
Breaking the front glass will enable the altimeter to functuin.
Breaking or opening the windows will enable the altimeter to function.
8. 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 Altitude indication.
Total loss of IAS indication.
Total loss of VSI indications.
9. 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+0.3 Kr.M²).
Tt = Ts(1+0.2 M²).
Tt = Ts(1+0.2 Kr.M²).
Tt = Ts(1-0.2 M²).
10. A pilot blockage of both the ram air input and the drain hole with the static port open causes the airspeed indicator to?
Freeze at zero.
Read a little high.
Read a little low.
React like an altimeter.
11. The pressure altitude is the altitude corresponding?
In standard atmosphere, to the reference pressure Ps.
In ambient atmosphere, to the reference pressure Ps.
In ambient atmosphere, to the pressure Ps prevailing at this point.
In standard atmosphere, to the pressure Ps prevailing at this point.
12. 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).
(2), (4), (5), (7), (8).
(1), (2), (4), (5), (7).
(1), (2), (4), (5), (7).
13. A blocked pilot probe will affect?
All of the above.
ASI
VSI
Altimeter
14. With a pitot probe blocked due to ice build up, the aircraft airspeed indicator will indicate in descent a ?
Decreasing speed.
Increasing speed.
Constant speed.
Fluctuating speed.
15. If the static tube and drains become blocked?
The ASI will under indicate.
The ASI will indicate zero.
The ASI will over indicate.
The altimeter will under indicate.
16. 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?
There will be no difference between them if the air data computer (ADC) is functioning normally.
ATC will get an erroneous altitude report SSR.
At high speed, the non-compensated altimeter will indicate a higher altitude.
At high speed the non-compensated altimeter will indicate s lower altitude
17. 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.
18. Which of the following is correct?
Pitot = Ptot+ Pdys.
Pdys = Ptot - Pitot.
PTot = Pstat + PDys
Pitot = Pdys - Pstat
19. 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?
Over indicate when side slipping right.
Under indicate in all conditions.
Over indicate in all conditions.
Over indicate when side slipping left.
20. 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).
21. Entering ground effect is likely to?
Increase position errors.
Decrease position errors.
Decrease pilot pressure but increase static pressure.
Decrease static pressure but increase pilot pressure.
22. The density altitude is?
The pressure altitude corrected for the density of air at this point.
The temperature altitude corrected for the difference between the real temperature and the standard temperature.
The altitude of the standard atmosphere on which the density is equal to the actual density of the atmosphere.
The pressure altitude corrected for the relative density prevailing at this point.
23. If the static source becomes blocked in a descent the ASI will ..... indicate , the VSI will.... indicate and the altimeter will .... indicate?
Over under over.
Under over over.
Over under under.
Under Under under.
24. If the pilot tube leaks and the pitot drains are blocked in an unpressurised aircraft?
The ASI will under indicate.
The altimeter will over indicate.
The ASI will over indicate.
The altimeter will under indicate.
25. On board an aircraft the altitude is measured from the?
Standard altitude.
Temperature altitude.
Pressure altitude.
Density altitude.
26. If the static tube and drains become blocked?
The altimeter will over indicate.
The altimeter will under indicate.
The altimeter will under or over depending on altitude.
The altimeter will indicate zero.
27. A blocked static vent will affect?
All of the above.
Altimeter
VSI
ASI
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 right.
They will both over indicate.
They will not be affected.
Both will under indicate when side slipping left.
29. The static pressure error of the static vent on which the altimeter is connected varies substantially with the?
Static temperature.
Aircraft altitude.
Mach number of the aircraft.
Deformation of the aneroid capsule.
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 steadily
Increases steadily
Decreases abruptly towards zero.
31. If the static slots of a pilot probe become blocked but the pilot tapping remains clear?
ASI acts as an altimeter.
ASI indication freezes.
ASI acts in the opposite sense to an altimeter.
ASI indication falls to zero.
32. If the static source of an altimeter becomes blocked during a descent the instrument will?
Over-read in a climb and under-read in a descent.
Under- read.
Gradually indicate zero
Under-read in a climb and over-read in a descent.
33. If the static source to an altimeter becomes blocked during a climb, the instrument will?
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.
Gradually return to zero.
34. 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
35. The altimeter is fed by?
Total pressure.
Differential pressure
Dynamic pressure.
Static pressure.
36. A leak in the pilot total pressure line of a non-pressurized aircraft to an airspeed indicator would cause it to?
Under Read
Over-read in a climb and under -read in a descent.
Over read
Under-read in a climb and over -read in a descent.
37. The QNH is by definition the value of the?
Altimeter setting so that the needles of the altimeter indicate the altitude of the location for which it is given.
Atmospheric pressure at the sea level of the location for which it is given.
Atmospheric pressure at the level of the ground over flown by the aircraft.
Altimeter setting so that the needles indicate zero when the aircraft is on ground at the location for which it is provided.
38. The operating principle of the vertical speed indicator (VSI) is based on the measurement of the rate of change of ?
Kinetic pressure.
Total pressure.
Dynamic pressure.
Static pressure.
39. 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.
40. The pressure measured at the forward facing orifice of a pitot tube is the?
Total pressure plus static pressure.
Static pressure.
Total pressure
Dynamic pressure.
41. A pilot tube covered by ice which blocks the ram air inlet will affect the following instrument(s)?
Airspeed indicator only.
Airspeed indicator , altimeter and vertical speed indicator.
Altimeter only.
Vertical speed indicator only.
42. 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?
Breaking the rate-of climb indicator glass window.
Calculating the ambient static pressure, allowing for the altitude and QNH and adjusting the instruments.i
Descending as much as possible in order to fly at a pressure as close to 1013.25 hpa as possible.
Slightly opening a window to restore the ambient pressure in the cabin.
43. 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), (4), (5).
(1), (2), (5), (7).
(2), (5), (7), (8).
(1), (2), (5), (6).
44. From the ISA table , the atmospheric pressure at FL 70 in a "standard + 10'' atmosphere is?
942.13 hPa.
1013.25 hPa.
644.41 hPa.
781.85 hPa.
45. 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?
Decreases steadily.
Increases abruptly towards VNE.
Increases steadily.
Decrease abruptly towards zero.
46. 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, 3, 4.
1, 2, 3, 4.
2, 3, 4.
1, 2, 3.
47. The airspeed Indicator circuit consists of pressure sensors. The pilot tube directly supplies?
The dynamic pressure.
The static pressure.
The total pressure
The total pressure and the static pressure.
48. A blocked pitot probe will affect?
Mach meter.
Altimeter.
All of the above.
VSI.
49. If the static vents in an unpressurised aircraft become blocked?
Breaking or opening the windows will enable the ASI function.
Breaking or opening the windows will enable the altimeter to function.
Breaking the front glass will cause the altimeter to under indicate.
Only instruments fed from an ADC will function.
50. The vertical speed indicator (VSI) is fed by?
Static pressure.
Differential pressure
Total pressure.
Dynamic pressure
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