DGCA Air Navigation: Pitot-Static System Questions
76 exam-style Pitot-Static System questions for the DGCA Air Navigationpaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
- Q1
Concerning the pitot static system, the static pressure error?
- A. Is a direct effect of blockage of the static ports.
- B. is a direct effect of heating of the static ports.
- CAffects the alternate static source only.
- D. Is caused by disturbed airflow around the static ports.
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Correct answer: D. . Is caused by disturbed airflow around the static ports.
Static (position) pressure error is caused by disturbed airflow around the static ports.
- Q2
The pressure measured at the forward facing orifice of a pitot tube is the :
- Atotal pressure plus static pressure.
- Bstatic pressure
- Ctotal pressure
- Ddynamic pressure
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Correct answer: C. total pressure
This Explanation is Coming Soon
- Q3
The alternate static source of a light non-pressurised aeroplane is located in the flight deck. When used the altimeter?
- ATends to over read
- BTens to under read
- Cis blocked
- DIndicates zero
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Correct answer: A. Tends to over read
Cabin static is lower than ambient, so on the alternate static source the altimeter tends to over-read.
- Q4
The alternate static source of a light non-pressurised aircraft is located in the flight deck. When it is used, the static pressure sensed is likely to be?
- ALower than ambient pressure if QNH is greater than 1013 hPa
- BLower than ambient pressure due to aerodynamic suction
- CHigher than ambient pressure due to aerodynamic suction
- DHigher than ambient pressure if QNH is greater than 1013 hPa
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Correct answer: B. Lower than ambient pressure due to aerodynamic suction
Flight-deck cabin pressure is lower than ambient because of aerodynamic suction over the fuselage.
- Q5
A pitot tube covered by ice which blocks the ram air inlet will affect the following instrument (s) :
- Aairspeed indicator, altimeter and vertical speed indicator
- Bvertical speed indicator only.
- Caltimeter only
- Dairspeed indicator only
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Correct answer: D. airspeed indicator only
This Explanation is Coming Soon
- Q6
The pressure altitude is the altitude corresponding?
- AIn standard atmosphere, to the reference pressure Ps.
- BIn ambient atmosphere, to the pressure Ps prevailing at this point.
- CIn standard atmosphere, to the pressure Ps prevailing at this point.
- DIn ambient atmosphere, to the reference pressure Ps.
Show answer
Correct answer: C. In standard atmosphere, to the pressure Ps prevailing at this point.
Pressure altitude is the altitude in the standard atmosphere at which the prevailing pressure occurs.
- Q7
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 :
- Abreaking the rate-of-climb indicator glass window
- Bcalculating the ambient static pressure, allowing for the altitude and QNH and adjusting the instruments
- Cdescending as much as possible in order to fly at a pressure as close to 1013.25 hPa as possible
- Dslightly opening a window to restore the ambient pressure in the cabin
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Correct answer: A. breaking the rate-of-climb indicator glass window
This Explanation is Coming Soon
- Q8
The ADC uses the following parameters as input data:
- AMach number, barometric altitude, CAS.
- BTAS, barometric altitude, TAT.
- CStatic pressure, total pressure, TAT.
- DTotal pressure, static pressure, TAT, EGT.
Show answer
Correct answer: C. Static pressure, total pressure, TAT.
The ADC's raw inputs are static pressure, total pressure and total air temperature.
- Q9
Pitot blocked in climb, altimeter will?
- AConstant
- BOver
- CUnder
Show answer
Correct answer: A. Constant
Altimeter uses static pressure, not pitot. A blocked pitot doesn’t affect it, so it stays constant and accurate.
- Q10
The total pressure head comprises a mast which moves its port to a distance from the aircraft skin in order?
- ATo not disturb the aerodynamic flow around the aircraft
- BTo locate it outside the boundary layer
- CTo protect it from icing
- DTo make it easily accessible during maintenance
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Correct answer: B. To locate it outside the boundary layer
The pitot mast holds its port clear of the boundary layer to sense undisturbed total pressure.
- Q11
Pitot partially blocked in climb, ASI will:
- AAct like altimeter
- BDecrease gradually
- CIncrease
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Correct answer: A. Act like altimeter
A partially blocked pitot traps pressure, so as static pressure drops in climb, ASI reads like an altimeter, showing a false increase.
- Q12
The response time of a vertical speed detector may be increased by adding a?
- ACorrection based on an accelerometer sensor.
- BBi-metallic strip.
- CReturn spring.
- DSecond calibrated port.
Show answer
Correct answer: A. Correction based on an accelerometer sensor.
Adding an accelerometer sensor creates the instantaneous VSI and improves its response time.
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