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DGCA Technical General: Aerofoils, Lift & Drag Questions

301 exam-style Aerofoils, Lift & Drag questions for the DGCA Technical Generalpaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.

  1. Q1

    Two aircraft have the same wing shape and area if one has straight wings and the other swept wings how will the aspect ratios of the two aircraft compare?

    • ANo change.
    • BAspect ratio will increase as wings stveepback angle increases
    • CAspect ratio will decrease as wing sweepback angle increases.
    • DDepends on the C of G position.
    Show answer

    Correct answer: C. Aspect ratio will decrease as wing sweepback angle increases.

    This Explanation is Coming Soon

  2. Q2

    Which of the following statements is most accurate?

    • AD1 is proportional to 1 / (EAS)2
    • BD1 is proportional to 1 I (IAS)2
    • CD1 is proportional to 1 I (RAS)2
    • DD1 is proportional to 1 I (TAS)2
    Show answer

    Correct answer: A. D1 is proportional to 1 / (EAS)2

    This Explanation is Coming Soon

  3. Q3

    Which wing plan forms are most susceptible to tip stall?

    • AHigh aspect ratio, elliptical, Low taper ratio, straight.
    • BHigh aspect ratio, pointed, high taper ratio, swept.
    • CLow aspect ratio, elliptical, low taper ratio, straight.
    • DLow aspect ratio, pointed, low taper ratio, swept.
    Show answer

    Correct answer: B. High aspect ratio, pointed, high taper ratio, swept.

    This Explanation is Coming Soon

  4. Q4

    236.Mark the correct statement?

    • AVortex generator improve aerodynamic characteristics
    • BVortex generator increase drag
    • CAll of the above are correct
    Show answer

    Correct answer: C. All of the above are correct

    Vortex generators re-energise the boundary layer, delaying separation and improving aerodynamic characteristics, but the small vanes inevitably add some parasite drag, so both statements are true.

  5. Q5

    Which of the following statements is most accurate?

    • AD1 is proportional to L.
    • BD1 is proportional to L/V.
    • CD1 is proportional to 1/L.
    • DD1 is proportional to V/L.
    Show answer

    Correct answer: B. D1 is proportional to L/V.

    This Explanation is Coming Soon

  6. Q6

    Which of the following are true of low aspect ratio rectangular wings?

    • AThey produce low induced drag and high profile drag.
    • BThey produce low profile drag and high induced drag.
    • CThey are difficult to construct and their roots stall before their tips.
    • D'They are easy to construct and their tips stall before their roots.
    Show answer

    Correct answer: B. They produce low profile drag and high induced drag.

    This Explanation is Coming Soon

  7. Q7

    If a 50000 Ibf aircraft requires 25000 lbf 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
    Show answer

    Correct answer: B. 2:1.

    This Explanation is Coming Soon

  8. Q8

    In what direction is the airflow deflected as it passes over the tips of lift generating pointed wings.

    • ADownwards.
    • BForwards.
    • CUpwards.
    • DAft.
    Show answer

    Correct answer: C. Upwards.

    This Explanation is Coming Soon

  9. Q9

    240.The influence of "Ground effect" is experienced by an aircraft when its height above the ground is

    • AAbout one wing span
    • BAbout half wing span
    • CAbout one and half wing span
    Show answer

    Correct answer: B. About half wing span

    Ground effect becomes significant once the wing is within about half a wingspan of the surface, where the ground interferes with the downwash and wingtip vortices and induced drag falls noticeably.

  10. Q10

    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.
    Show answer

    Correct answer: B. Increases in direct proportion to load factor.

    This Explanation is Coming Soon

  11. Q11

    Which of the following statements are true of elliptical wings? 1. Almost the entire wing reaches its stalling angle simultaneously. 2. It poses structural problems making design and construction difficult. , 3. The aircraft exhibits little or no pre-stall buffet. 4. Aileron effectiveness is reduced close to the stall.

    • A1, 2,3.
    • B1,2,4.
    • C2,3,4.
    • DAll of the above.
    Show answer

    Correct answer: D. All of the above.

    This Explanation is Coming Soon

  12. Q12

    419.Lift and drag on airplane depend upon?

    • ACP, CG, LAS, Air density
    • BAngle of attack, air density, velocity, CG
    • CAngle of attack, air density, aerofoil shape, velocity
    Show answer

    Correct answer: C. Angle of attack, air density, aerofoil shape, velocity

    Lift and drag are given by the coefficient equations: they depend on angle of attack, air density, aerofoil shape and the square of velocity; the CG position affects trim and stability but is not a term in the lift or drag equations.

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