DGCA Performance: Lift, Drag & Flaps Questions
112 exam-style Lift, Drag & Flaps questions for the DGCA Performancepaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
- Q1
Which of the following statements is most accurate?
- ADl is proportional to 1 /(EAS)2
- BDl is proportional to 1 /(IAS)2
- CDl is proportional to 1 /(RAS)2
- DDl 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?
- Alncreases CL and Vs
- BDecreases CL and Vs
- Clncreases CL and decreases Vs
- DDecreases 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?
- ADl is proportional to L.
- BDl is proportional to L/V.
- CDl is proportional to 1/L.
- DDl 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?
- AMaximum deflection.
- BZero degrees.
- C20 degrees.
- D30 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?
- A1:2
- B2:1
- C10:1
- D20:1
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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?
- AZero angle.
- BMaximum angle.
- C20 degrees.
- D30 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?
- ANo effect.
- BIncreases in direct proportion to load factor.
- CDecreases in direct proportion to load factor.
- DPower 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?
- ANot affect.
- BDecrease.
- CIncrease.
- DIncrease 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?
- AIncrease, No significant effect, increase.
- BIncrease, Decrease, No significant effect.
- CDecrease, Increase, No significant effect.
- DDecrease, 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?
- AInduced drag decreases with increasing angle of attack
- BInduced drag increases with increasing speed
- CInduced drag decreases with increasing speed
- DInduced 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?
- A15° trailing edge flap.
- B30° trailing edge flap.
- C45° trailing edge flap.
- D15° 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.
- AIncrease, Increase
- BIncrease, Decrease.
- CDecrease, Increase
- DDecrease, Decrease.
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Correct answer: B. Increase, Decrease.
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