CPD240 Mid S/64

The total pressure is:

• (a) static pressure plus dynamic pressure

• (b) static pressure minus dynamic pressure

• (c) 1/2ρV2

• (d) measured parallel to the local stream

Which formula or equation describes the relationship between force (F), acceleration (a) and

mass (m)?

• (a) a = F.m

• (b) F = m/a

• (c) F = m.a

• (d) m = F.a

If the continuity equation is applicable to an incompressible airflow in a tube at low subsonic speed, if the diameter of the tube increases the speed of the flow:

• (a) increases

• (b) becomes sonic

• (c) decreases

• (d) remains the same

Static pressure acts:

• (a) perpendicular to the direction of flow

• (b) in the direction of the total pressure

• (c) in all directions

• (d) in the direction of the flow

The units used to measure air density are:

• (a) kg/cm3

• (b) Bar

• (c) kg/m3

• (d) psi

Bernoulli’s theorem states:

• (a) dynamic pressure increases as static pressure increases

• (b) dynamic pressure increases as static pressure decreases

• (c) dynamic pressure is greatest at the stagnation point

• (d) dynamic pressure is zero when the total pressure is greatest

If the continuity equation is applicable to an incompressible airflow in a tube at low subsonic speed, if the diameter of the tube decreases the speed of the flow:

• (a) increases

• (b) becomes supersonic

• (c) decreases

• (d) remains the same

If the velocity in a stream tube is increased, the streamlines:

• (a) remain the same

• (b) move further apart

• (c) move closer together

• (d) are not affected by the velocity

The relative thickness of an aerofoil is expressed in:

• (a) centimetres

• (b) metres

• (c) degrees of cross section

• (d) % chord

The angle of attack of an aerofoil is the angle between the:

• (a) longitudinal axis and the chordline

• (b) chordline and the undisturbed airflow

• (c) longitudinal axis and the horizontal

• (d) longitudinal axis and the undisturbed airflow