DGCA Technical General: Ice & Rain Protection Questions
74 exam-style Ice & Rain Protection questions for the DGCA Technical General paper (CPL · ATPL · PPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
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Q1
The areas heated by a typical bleed air anti icing system include?
- A Leading and trailing edges
- B Leading edges, leading edges flaps and slats, and engine air intake lips
- C Trailing edge flaps
- D The entire wing surface
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Correct answer: B. Leading edges, leading edges flaps and slats, and engine air intake lips
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Q2
In a bleed air anti icing system the areas that are heated are
- A The whole of the wing
- B Wing leading edge slats and flaps
- C Wing leading edges and slats
- D Trailing edge flaps
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Correct answer: C. Wing leading edges and slats
A bleed-air (hot air) anti-icing system pipes hot compressor air to the wing leading edges and to the leading-edge slats, the surfaces most prone to ice accretion. Flaps and the rest of the wing are not heated.
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Q3
What ice protection system is used on most modern jet transport aircraft
- A Liquid
- B Electrical
- C Hot air
- D Pressure operated boots
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Correct answer: C. Hot air
Most modern jet transport aircraft protect leading edges and engine intakes with hot air bled from the engine compressors, ducting this heat to prevent ice forming on the critical surfaces.
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Q4
Anti icing/de icing of the wings of a modern turbo-prop aircraft is typically achieved using?
- A Hot air.
- B Liquids
- C Pneumatic boots
- D Electrical heaters
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Correct answer: C. Pneumatic boots
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Q5
389.In flight airframe icing does not occur:
- A above 25 000 feet.
- B above 40000 feet
- C above 35 000 feet.
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Correct answer: B. above 40000 feet
Above about 40,000 feet the ambient temperature is generally below -40 degrees C, at which supercooled water droplets can no longer exist; any moisture is present only as ice crystals, which do not adhere to the airframe, so structural icing does not occur.
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Q6
On a modern turbo prop aircraft the method of anti-icing/de-icing the wings is?
- A Fluid
- B Pneumatic boots
- C Electrical heater mats
- D Hot air bled from the engines
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Correct answer: B. Pneumatic boots
Turboprop aircraft typically de-ice the wing leading edges with pneumatic rubber boots that inflate to crack and shed accreted ice, as they usually lack the large volume of engine bleed air that big jets use for hot-air anti-icing.
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Q7
What is the effect of heating flight deck windows
- A To demist the interior of the window if normal demist does not function correctly
- B To protect the windows against bird strike
- C To protect the windows against ice formation
- D To protect the windows against bird strike and ice formation
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Correct answer: D. To protect the windows against bird strike and ice formation
Electrically heated flight-deck windows serve two purposes: keeping the outer surface clear of ice and, by warming the laminated panel, making it more pliable and resilient so it better withstands a bird strike. The heat therefore protects against both ice and bird impact.
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Q8
Windscreen heating system?
- A Increase the danger of damage in the event of a bird strike
- B Use engine bled air to heat the centre section only
- C Use engine bleed air to heat the entire screen
- D Use electrical system to maintain constant temperature across the entire screen
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Correct answer: D. Use electrical system to maintain constant temperature across the entire screen
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Q9
Electrically heated turbo-prop propeller system?
- A Provide de-icing and use a 10 second working cycle
- B Provide de-icing using a frequency to 10 cycles per second
- C Provide anti-icing and use a 10 second working cycle
- D Provide anti-icing using a frequency of 10 cycles per second
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Correct answer: A. Provide de-icing and use a 10 second working cycle
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Q10
431.How is ice prevented from forming on the front windshield of large systems
- A Warm air is blown over the windshield
- B De-Icing fluid are spread
- C Electrically heated windshields
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Correct answer: C. Electrically heated windshields
Large aircraft prevent ice on the front windshield with transparent conductive films laminated within the glass, electrically heated and thermostatically controlled; the heating also keeps the panel resilient against bird strike.
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Q11
Windscreens are kept clear in heavy rain by using?
- A Liquid repellents
- B Windscreen wipers
- C Bleed air
- D All of the above
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Correct answer: B. Windscreen wipers
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Q12
Hot air anti-icing is provided to?
- A Leading edges only
- B Leading edges and flaps
- C Leading edge flaps and slats
- D Leading edges plus leading edge flaps and slats
Show answer
Correct answer: D. Leading edges plus leading edge flaps and slats
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