DGCA Technical General: High-Lift Devices Questions
148 exam-style High-Lift Devices 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.
- Q1
What is the effect of deploying trailing edge flaps?
- AIncreases CL and Vs
- BDecreases CL and Vs
- CIncreases CL and decreases Vs
- DDecreases CL and increases Vs
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Correct answer: C. Increases CL and decreases Vs
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- Q2
What is the effect of deploying leading edge slats?
- AEnergising boundary layer and increasing Vs
- BDe-energising boundary layer and decreasing Vs
- CEnergising boundary layer and decreasing Vs
- DDe-energising boundary layer and increasing Vs
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Correct answer: C. Energising boundary layer and decreasing Vs
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- Q3
247.What is the purpose of flap loading relief valve system ?
- APilot can select the flap but wil not extend until speed is below flap extended speed
- B Flap will extend as soon as speed decreases to its valve
- CBoth A and B are correct
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Correct answer: C. Both A and B are correct
The flap load relief system protects the flaps from air loads that exceed their structural limits: a selection made at too high a speed is not fully actioned until the speed has fallen within the flap limit, and the flaps then travel to the selected position automatically as the speed reduces. Both descriptions are therefore aspects of the same protective function.
- Q4
What is the effect on wing pitching moment, of deploying trailing edge flaps prior to landing?
- AIncreased nose down pitching moment.
- BDecreased nose down pitching moment.
- CNose up pitching moment replaced by a nose down pitching moments.
- DIncreased nose up pitching moment.
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Correct answer: C. Nose up pitching moment replaced by a nose down pitching moments.
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- Q5
What effect does deployment of trailing edge flaps have on stalling angle of attack?
- ANo change.
- BIncreased stalling angle.
- CDecreased stalling angle.
- DIncreased or decreased stalling angle depending on wing sweep angle.
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Correct answer: C. Decreased stalling angle.
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- Q6
What is the effect of deployment of leading edge flaps in conjunction with trailing edge flaps?
- AMoves C of P aft increasing nose down pitching moment caused by trailing edge flaps.
- BMoves C of P forward reducing nose down pitching moment caused by trailing edge flaps.
- CMoves C of G aft increasing nose down pitching moment caused by trailing edge flaps.
- DMoves C of G fonvard reducing nose down pitching moment caused by trailing edge flaps.
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Correct answer: B. Moves C of P forward reducing nose down pitching moment caused by trailing edge flaps.
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- Q7
What configuration of krueger flaps and slats would produce the best post-stall handling characteristics in a swept wing aircraft?
- ASlats inboard and Krueger flaps outboard.
- BFull span slats.
- CFull span Krueger flaps.
- DKruger flaps inboard and slats outboard.
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Correct answer: D. Kruger flaps inboard and slats outboard.
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- Q8
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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- Q9
Choose correct statement
- AThe flap load relief system (LRS) retracts the flap is in intermediate position if the airspeed exceeds a predetermined speed
- BThe LRS does not allow the flap to retract case of system failure
- CThe LRS provides protection against asymmetric operations
Show answer
Correct answer: A. The flap load relief system (LRS) retracts the flap is in intermediate position if the airspeed exceeds a predetermined speed
The flap load relief system protects the flaps from excessive air loads: if airspeed exceeds the flap limit at a large flap setting, it automatically retracts the flaps to an intermediate position and re-extends them once speed is reduced.
- Q10
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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- Q11
349.If landing is made without flaps the landing speed must be:
- A Reduced
- Bincreased
- CNo change in speed is required
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Correct answer: B. increased
Without flaps the wing's maximum lift coefficient is lower, so a higher speed is needed to generate lift equal to weight at touchdown; a flapless landing therefore requires an increased approach and landing speed.
- Q12
Kreuger flaps are positioned
- A Towards the wing tip
- BAt the wing inner leading edge
- C Along the whole leading edge
- D At the wing trailing edge
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Correct answer: B. At the wing inner leading edge
Krueger flaps are leading edge devices fitted on the inboard section of the wing leading edge, hinging forward and down from the lower surface. Slats typically occupy the outboard leading edge.
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