POF – 08 High Lift Devices – LMS

📄 Detailed Notes ⚡ Cheat Sheet

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📄 Notes ⚡ Cheat Sheet

Q1. The lift coefficient (Cl) of a wing at a given angle of attack:

is increased by the use of high lift devices

is a constant and not affected by high lift devices

is reduced when high lift devices are used

is dependent on the surface area of the wing

Q2. Because of the reduction in Cl when flaps are raised, to maintain a constant lift force:

the angle of attack must be decreased

the angle of attack must be increased

the angle of attack must remain the same

the nose of the aircraft should be lowered

Q3. Because of the reduction in Cl when the flaps are raised in flight to maintain level flight, the angle of attack:

would have to be decreased

would have to be increased

would be required to remain the same

Q4. If flaps are raised in flight while speed and attitude are kept constant:

the aircraft will gain height

the aircraft will sink

the aircraft will maintain height

the aircraft will stall

Q5. During flap down selection in a continuous straight and level flight at constant IAS and weight:

the lift coefficient and the drag coefficient increase

the centre of pressure moves aft

the stall speed increases

the total boundary layer becomes laminar

Q6. Which statement is correct?

Spoiler extension decreases the stall speed and the minimum rate of descent, but increases the minimum descent angle

Extension of flaps will increase (CL/CD) max, causing the minimum rate of descent to decrease

Extension of flaps has no influence on the minimum rate of descent, as only the TAS has to be taken into account

Extension of flaps causes a reduction of the stall speed, the maximum glide distance also reduces

Q7. The lift augmentation device shown in the figures is a:

Zap flap

Fowler flap

Krueger flap

Split flap

Q8. Which type of flap is shown in the picture?

Plain flap

Split flap

Single slotted flap

Fowler flap

Q9. The maximum angle of attack for the flaps down configuration, compared to flaps up is:

greater

smaller

unchanged

smaller or greater, depending on CG position

Q10. When deploying the flaps the effective angle of attack:

decreases

remains the same

increases

may increase of decrease depending on the aircraft type

Q11. CLmax may be increased by the use of:

flaps

slats

boundary layer control

A, B and C

Q12. Compared with the clean configuration, the angle of attack at CLmax with trailing edge flaps extended is:

smaller or larger depending on the degree of flap extension

larger

unchanged

smaller

Q13. Extension of leading edge flaps will:

increase critical angle of attack

decrease CLmax

decrease drag

not affect critical angle of attack

Q14. Flap extension at constant IAS whilst maintaining straight and level flight will increase the:

stall speed

lift coefficient and the drag

maximum lift coefficient (CLmax) and the drag

lift and the drag

Q15. If flaps are slightly asymmetric this would cause:

a roll to a given bank angle which may be correctable with rudder

a steady rate of roll which may be correctable with ailerons

a steady rate of pitch which may be correctable with elevators

a roll to a given bank angle which may be correctable with ailerons

Q16. The type of flap which extends backwards from the trailing edge as its lowered is:

a split flap

a Krueger flap

a Fowler flap

a Lower flap

Q17. The type of flap that increases wing area is:

a split flap

a fowler flap

a Plain flap

a Slotted flap

Q18. One of the main functions of flaps during an approach and landing is to:

decrease the angle of descent without increasing the airspeed

provide the same amount of lift at a slower speed

decrease lift, thus enabling a steeper than normal approach to be made

increase lift more than drag

Q19. An aeroplane has the following flap settings : 0°, 15°, 30° and 45°. Slats can be selected too. Which of the above selections will produce the greatest negative influence on the CL CD ratio?

The slats

Flaps from 0° to 15°

Flaps from 30° to 45°

Flaps from 15° to 30°

Q20. What is the effect of deploying leading edge flaps?

Decrease CLMAX

Decrease the critical angle of attack

Not affect the critical angle of attack

Increase the critical angle of attack

Q21. A Krueger flap is:

part of the upper surface of the leading edge, which moves forward

part of the lower surface of the leading edge, hinged at its forward edge

a flap which extends rearward from the trailing edge

a flap which extends from the upper surface of the wing, to increase drag

Q22. Slats:

de-energise the boundary layer, thereby decreasing the stalling angle of attack

re-energise the boundary layer thereby decreasing the stalling angle of attack

re-energise the boundary layer thereby increasing the stalling angle of attack

de-energise the boundary layer thereby increasing the stalling angle of attack

Q23. Slats:

increase CLmax

decrease the minimum angle of attack

both A and B

neither A or B

Q24. A slat will:

increased the camber of the aerofoil and divert the flow around the sharp leading edge

prolong the stall to a higher angle of attack

increase the lift by increasing the wing area and the camber of the aft portion of the wing

provide a boundary layer suction on the upper surface of the wing

Q25. A slat is fitted to an aerofoil to:

reduce the stalling angle

delay the stall and so increase the lift

increase the drag and so enable the aircraft to fly more slowly

increase the speed at which the aircraft stalls

Q26. A slat is:

a leading edge high lift device, hinged at its forward edge, which increases the camber and leading edge radius of the main aerofoil when deployed

a trailing edge device which is automatically deployed by movement of the stagnation point at high angles of attack

an auxiliary, cambered aerofoil positioned forward of the main aerofoil so as to form a slot

a fixed slot in the leading edge of some older types of aircraft

Q27. Given the following aeroplane configurations:

Q28. Slats are used in modern planes along with Flaps. Which is true amongst the following answers:

Slats contribute more than Flaps in reducing the Stall Speed

Flaps contribute more than Slats in reducing the stall Speed

Flaps & Slats equally contribute in reducing the stall speed

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