5 Quiz POWER and GROUND EFFECT

The speed of Vmp for a jet aeroplane is:

• lower than Vmd in a climb and higher than Vmd in a descent
• the same as Vmd
• always lower than Vmd
• always higher than Vmd

The tangent from the origin to the power-required curve touches the curve at the speed of:

• Vmp
• where the Lift/Drag ratio is at a maximum
• where CD is minimum
• where the Lift/Drag ratio is minimum

To fly at a speed between Vimd and Vs it would require:

• increased flap
• increased thrust
• decreased thrust
• decreased flap

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

• at a speed approaching the stall
• when the height is less than twice the length of the wing span above the surface
• when the height is less than halve of the length of the wing span above the surface
• when a higher than normal angle of attack is used

The maximum ground distance during a glide with zero thrust increases:

• in a headwind at a constant aeroplane mass compared with zero wind.
• with a decrease in aeroplane mass in zero wind.
• in a tailwind at a constant aeroplane mass compared with zero wind.
• with an increase in aeroplane mass in zero wind.

Which statement about an aeroplane entering ground effect is correct? I. The downwash angle increases. II. The induced angle of attack remains constant.

• I is incorrect, II is incorrect.
• I is correct, II is correct.
• I is incorrect, II is correct.
• I is correct, II is incorrect.

Assuming constant IAS, when an aeroplane leaves ground effect:

• induced drag decreases.
• the effective angle of attack increases.
• downwash increases.
• downwash does not change.

When entering ground effect, maintaining the same coefficient of lift, CL, requires…

• flaps to be set to the landing configuration.
• an increase in thrust.
• a lower angle of attack.
• a greater angle of attack.

Which aircraft configuration is most effected by ground effect?

• High wing, high tail
• Low wing, low tail
• High wing, low tail
• Low wing, high tail