POF Q15 - Ground Effect

Question 1

What will happen in ground effect?
Select one:

a.The induced angle of attack and induced drag decrease

b.The wing tip vortices increase in strength

c.The thrust required will increase significantly

d.The wing downwash on the tail surfaces increase

Answer 1

a.The induced angle of attack and induced drag decrease

Question 2

If an aeroplane flies in the ground effect
Select one:

a.drag and lift are reduced

b.the induced angle of attack is increased

c.the lift is increased and the drag is decreased

d.the effective angle of attack is decreased

Answer 2

c.the lift is increased and the drag is decreased

Question 3

Upon leaving ground effect, the induced angle of attack

Select one:

a.Increases due to an increase in downwash

b.Decreases due to a decrease in downwash

c.Decreases due to an increase in downwash

d.increases with increasing speed

Answer 3

a.Increases due to an increase in downwash

Question 4

The CL to CD ratio improves when entering ground effect.
Select one:

a.False

b.True

c.Only the lift to drag ratio improves.

d.Remains unchanged

Answer 4

b.True

Question 5

Floating due to ground effect during an approach to land will occur:
Select one:

a.when a higher than normal angle of attack is used

b.when the height is less than half of the length of the wing span above the surface

c.when the height is less than twice the length of the wing span above the surface

d.at a speed approaching the stall

Answer 5

b.when the height is less than half of the length of the wing span above the surface

Question 6

Ground effect has what effect on Alpha crit?
Select one:

a.Alpha crit is reduced leaving ground effect

b.Alpha crit is reduced entering ground effect.

c.Alpha crit is increased entering ground effect.

d.Alpha crit does not change with ground effect

Answer 6

b.Alpha crit is reduced entering ground effect.

Question 7

CL Max is increased when leaving ground effect?
Select one:

a.It is aircraft dependant

b.CL Max is not effected by ground effect

c.TRUE

d.FALSE

Answer 7

d.FALSE

Question 8

Ground effect has the following influence on the landing distance:
Select one:

a.increases

b.decreases

c.does not change

d.increases, only if the landing flaps are fully extended

Answer 8

a.increases

Question 9

Which statement is correct?
Select one:

a.High wing aircraft often have longer landing distances

b.A low wing aircraft is more influenced by the ground effect than a high wing.

c.Wing height has no effect ground effect effects

d.A high wing aircraft is more influenced by the ground effect than a low wing.

Answer 9

b.A low wing aircraft is more influenced by the ground effect than a high wing.

Question 10

At which height is an aircraft most affected by ground effect?

a.1 wingspan

b.2 wingspan

c.1/4 wingspan

d.1/2 wingspan

Answer 10

c.1/4 wingspan