Compressible flow and shock waves MCQs – Aerospace

1. Compressible flow refers to:
(A) Flow where density variations are significant
(B) Flow with constant density
(C) Flow with negligible velocity changes
(D) Flow that only occurs in liquids

2. Shock waves occur in compressible flows when:
(A) The flow velocity is below the speed of sound
(B) The flow velocity exceeds the speed of sound
(C) The fluid density is constant
(D) The flow is laminar

3. The Mach number is defined as the ratio of:
(A) Flow velocity to the speed of sound
(B) Flow density to the speed of sound
(C) Pressure to the speed of sound
(D) Temperature to the speed of sound

4. A Mach number greater than 1 indicates:
(A) Subsonic flow
(B) Transonic flow
(C) Supersonic flow
(D) Hypersonic flow

5. In compressible flow, the density of the fluid:
(A) Remains constant
(B) Increases with increasing speed
(C) Decreases with increasing speed
(D) Is unaffected by temperature changes

6. The normal shock wave is characterized by:
(A) An increase in pressure and density
(B) A decrease in velocity and density
(C) A decrease in pressure and velocity
(D) An increase in temperature and velocity

7. The area-velocity relationship for compressible flow indicates:
(A) Area increases with increasing velocity in subsonic flow
(B) Area decreases with increasing velocity in supersonic flow
(C) Area and velocity are independent in compressible flow
(D) Area decreases with increasing velocity in subsonic flow

8. The Mach number at the throat of a converging-diverging nozzle is:
(A) Greater than 1
(B) Equal to 1
(C) Less than 1
(D) Zero

9. The Prandtl-Meyer expansion fan is associated with:
(A) Subsonic flow
(B) Shock waves
(C) Supersonic flow
(D) Hypersonic flow

10. In supersonic flow, the flow is:
(A) Compressible
(B) Incompressible
(C) Constant density
(D) Irrelevant to shock waves