8. Basic aerodynamics - Q&A
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The angle of attack which gives the best L/D ratio
- decreases when density decreases.
- in unaffected by density changes.
- increases when density decreases.
how?
The angle of attack which gives the best L/D ratio
- decreases when density decreases.
- in unaffected by density changes.
- increases when density decreases.
how?
When an aircraft experiences induced drag
- air flows under the wing spanwise towards the tip and on top of the wing spanwise towards the root.
- air flows under the wing spanwise towards the root and over the top spanwise towards the tip.
- neither of the above since induced drag is not caused by spanwise flow patterns.
please someone explain to me.
Angle of attack on a down going wing in a roll
- increases.
- decreases.
- unaffected.
why? thanks for the help.
The induced drag of an aircraft
- increases if the aspect ratio is increased.
- decreases with increasing speed.
- increases with increasing speed.
can somewone explain this
The relationship between induced drag and airspeed is, induced drag is
- directly proportional to the square of the airspeed.
- directly proportional to airspeed alone.
- inversely proportional to the square of the speed.
Induced drag results from production of lift. Lift depends on airspeed squared, not 1 over airspeed squared.
With increasing altitude the angle at which a wing will stall
- remains the same.
- reduces with altitude.
- increases with altitude.
why?
The difference between transient droop and static droop is
- overswing.
- underswing.
- a hole in one.
can anyone explain me what is trasient droop and static droop?
Under what conditions will an aircraft create best lift?
- Hot damp day at 1200 ft.
- Cold dry day at 200 ft.
- Cold wet day at 1200 ft.
Cold dry is completely opposite in meaning. What is a cold dry day ? Can someone explain .
Due to the change in lift coefficient accompanying extension of the flaps, to maintain the lift constant it would be necessary to
- raise the nose.
- lower the nose.
- keep pitch attitude constant.
Explain please
On a high winged aircraft in a banked turn, which of the following are true?
- The down-going wing loses lift producing a stabilizing effect.
- The up-going wing loses lift causing a stabilizing effect.
- The wing dihedral alone causes a stabilizing effect.
Please explain this.
What effect does lowering flaps for takeoff have?
- Reduces takeoff speeds only.
- Reduces the landing speed only.
- Reduces both takeoff and landing speeds.
How you come to know???
What principle does the delta 3 hinge use?
- Triangular pitch lever.
- Flapping actuators.
- Offset hinges.
I have no idea...
The power required at low altitude for a given IAS is
- unchanged with altitude.
- higher.
- lower.
Please explain. There is more drag at low altitude. Is it because of less quantity of oxygen at higher altitude?
Where would you find the normal axis?
- Through C of G at right angles to longitudinal and lateral axis.
- Vertically through the centre of pressure at right angles to the chord line.
- In line with the wing tips, passing through the C of G horizontally.
Why?
If an aircraft is yawing to the left, where would you position the trim tab on the rudder?
- To the centre.
- To the left.
- To the right.
this is wrong. it will move to the right
As a subsonic aircraft speeds-up, its Centre of Pressure
- moves aft.
- moves forward.
- is unaffected.
explanation please?
If an aircraft is yawing left, the trim tab on the rudder would be positioned
- to the right, deflecting the rudder left.
- back to its neutral centre position.
- to the left, moving the rudder right.
Wrong!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Due to the interference of the airflow on a high wing aircraft between the fuselage and the wings, the lateral stability of the aircraft in a gusty wind situation will cause
- the upper wing to increase its lift.
- the upper wing to decrease its lift.
- the lower wing to decrease its lift.
uhmm more detailed explanation plz?
Ice formed on the leading edge will cause the aircraft to
- stall at a higher speed.
- stall at a lower speed.
- stall at the normal stall speed and AOA.
Why?
After a disturbance in pitch, an aircraft continues to oscillate at constant amplitude. It is
- longitudinally statically unstable.
- longitudinally neutrally stable.
- laterally dynamically unstable.
Why?
If the radius of a turn is reduced the load factor will
- increase.
- decrease.
- stay unchanged.
if i reduce the radius, don't the a/c decrease the load factor?
The amount of thrust produced by a jet engine or a propeller can be calculated using
- Newton's 3rd law.
- Newton's 2nd law.
- Newton's 1st law.
why?
Deployment of flaps will result in
- a decrease in stall angle.
- an increase in stall angle.
- a decrease in angle of attack.
is the reason for this is increase in drag??/
Which will weigh the least?
- 98 parts of dry air and 2 parts of water vapour.
- 50 parts of dry air and 50 parts of water vapour.
- 35 parts of dry air and 65 parts of water vapour.
??