DGCA Technical General: Aerofoils, Lift & Drag Questions
301 exam-style Aerofoils, Lift & Drag 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.
-
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?
- A No change.
- B Aspect ratio will increase as wings stveepback angle increases
- C Aspect ratio will decrease as wing sweepback angle increases.
- D Depends 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
-
Q2
Which of the following statements is most accurate?
- A D1 is proportional to 1 / (EAS)2
- B D1 is proportional to 1 I (IAS)2
- C D1 is proportional to 1 I (RAS)2
- D D1 is proportional to 1 I (TAS)2
Show answer
Correct answer: A. D1 is proportional to 1 / (EAS)2
This Explanation is Coming Soon
-
Q3
Which wing plan forms are most susceptible to tip stall?
- A High aspect ratio, elliptical, Low taper ratio, straight.
- B High aspect ratio, pointed, high taper ratio, swept.
- C Low aspect ratio, elliptical, low taper ratio, straight.
- D Low 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
-
Q4
236.Mark the correct statement?
- A Vortex generator improve aerodynamic characteristics
- B Vortex generator increase drag
- C All 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.
-
Q5
Which of the following statements is most accurate?
- A D1 is proportional to L.
- B D1 is proportional to L/V.
- C D1 is proportional to 1/L.
- D D1 is proportional to V/L.
Show answer
Correct answer: B. D1 is proportional to L/V.
This Explanation is Coming Soon
-
Q6
Which of the following are true of low aspect ratio rectangular wings?
- A They produce low induced drag and high profile drag.
- B They produce low profile drag and high induced drag.
- C They 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
-
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?
- A 1:2.
- B 2:1.
- C 10:1
- D 20:1
Show answer
Correct answer: B. 2:1.
This Explanation is Coming Soon
-
Q8
In what direction is the airflow deflected as it passes over the tips of lift generating pointed wings.
- A Downwards.
- B Forwards.
- C Upwards.
- D Aft.
Show answer
Correct answer: C. Upwards.
This Explanation is Coming Soon
-
Q9
240.The influence of "Ground effect" is experienced by an aircraft when its height above the ground is
- A About one wing span
- B About half wing span
- C About 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.
-
Q10
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.
Show answer
Correct answer: B. Increases in direct proportion to load factor.
This Explanation is Coming Soon
-
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.
- A 1, 2,3.
- B 1,2,4.
- C 2,3,4.
- D All of the above.
Show answer
Correct answer: D. All of the above.
This Explanation is Coming Soon
-
Q12
419.Lift and drag on airplane depend upon?
- A CP, CG, LAS, Air density
- B Angle of attack, air density, velocity, CG
- C Angle 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.
The full bank
289 more Aerofoils, Lift & Drag questions in the full bank
Create a free account to practise every Aerofoils, Lift & Drag question with instant scoring, chapter tests, previous DGCA papers and full-length mock exams.
More DGCA Technical General topics