DGCA Performance: Lift, Drag & Flaps Questions
112 exam-style Lift, Drag & Flaps questions for the DGCA Performance 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
Which of the following statements is most accurate?
- A Dl is proportional to 1 /(EAS)2
- B Dl is proportional to 1 /(IAS)2
- C Dl is proportional to 1 /(RAS)2
- D Dl is proportional to 1 /(TAS)2
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Correct answer: A. Dl is proportional to 1 /(EAS)2
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Q2
What is the effect of deploying trailing edge flaps?
- A lncreases CL and Vs
- B Decreases CL and Vs
- C lncreases CL and decreases Vs
- D Decreases CL and increases Vs
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Correct answer: C. lncreases CL and decreases Vs
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Q3
Which of the following statements is most accurate?
- A Dl is proportional to L.
- B Dl is proportional to L/V.
- C Dl is proportional to 1/L.
- D Dl is proportional to V/L.
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Correct answer: B. Dl is proportional to L/V.
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Q4
What trailing edge flap angle will give the minimum stalling speed?
- A Maximum deflection.
- B Zero degrees.
- C 20 degrees.
- D 30 degrees.
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Correct answer: A. Maximum deflection.
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Q5
If a 50000 Ibf aircraft requires 25000 Ibf of thrust maintain unaccelerated straight and level flight at 250 Kts what is its L:D ratio?
- A 1:2
- B 2:1
- C 10:1
- D 20:1
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Correct answer: B. 2:1
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Q6
What trailing edge flap angle will give best L : D ratio?
- A Zero angle.
- B Maximum angle.
- C 20 degrees.
- D 30 degrees.
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Correct answer: A. Zero angle.
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Q7
What effect does increasing load factor have on power required at any given aircraft weight and TAS?
- A No effect.
- B Increases in direct proportion to load factor.
- C Decreases in direct proportion to load factor.
- D Power required is inversely proportional to load factor.
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Correct answer: B. Increases in direct proportion to load factor.
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Q8
Deployment of trailing edge flaps in straight and level flight will ................. induced drag?
- A Not affect.
- B Decrease.
- C Increase.
- D Increase or decrease depending on flap angle selected.
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Correct answer: C. Increase.
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Q9
What effect will increasing weight have on Dl DP and DTotal at any given load factor and airspeed?
- A Increase, No significant effect, increase.
- B Increase, Decrease, No significant effect.
- C Decrease, Increase, No significant effect.
- D Decrease, No significant effect, increase.
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Correct answer: A. Increase, No significant effect, increase.
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Q10
Which of the following statements is correct?
- A Induced drag decreases with increasing angle of attack
- B Induced drag increases with increasing speed
- C Induced drag decreases with increasing speed
- D Induced drag is independant of the speed
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Correct answer: C. Induced drag decreases with increasing speed
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Q11
Which of the following will reduce L:D ratio most?
- A 15° trailing edge flap.
- B 30° trailing edge flap.
- C 45° trailing edge flap.
- D 15° slat.
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Correct answer: C. 45° trailing edge flap.
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Q12
What effect will increasing aircraft weight have on minimum drag speed (VMD) and speed stability.
- A Increase, Increase
- B Increase, Decrease.
- C Decrease, Increase
- D Decrease, Decrease.
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Correct answer: B. Increase, Decrease.
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