Principles of Flight Quiz 1

Question 1) In relation to the flow through a venturi tube:

Static pressure is greatest within the constriction

Dynamic pressure increases in the tube as the tube widens

Total pressure is lowest in the venturi’s throat

Static pressure reduces as the tube narrows

Correct! Wrong!

As the tube narrows dynamic pressure increases and so for total pressure to remain constant static pressure reduces.

Question 2) The angle of attack is the angle between the:

Lower aerofoil surface and the mean camber line

Mean camber line and the relative airflow

Upper aerofoil surface and the chord line

Chord line and the relative airflow

Correct! Wrong!

The angle between the wing chord line and the relative airflow.

Question 3) Compared to the free stream airflow, in normal flight, air over the top of a wing will:

Decrease in speed

Have the same speed

Increase in speed

Have a higher pressure

Correct! Wrong!

The camber of the wing means that as air passes over the top of it it will increase in speed compared to the free stream flow, as it is forced over the top curvature of the camber.

Question 4) As the angle of attack increases, what will happen to the area of lowest pressure?

It will move forwards

It will move aft

It will not move

It moves from the upper to the lower wing surface

Correct! Wrong!

As the angle of attack increases the centre of pressure moves forward towards the leading edge until the critical angle of attack at which it abruptly moves aft.