Fundamentals of compressible flow (CO1)

Match the following

• Transonic

• Mach No < 0.3

• Hypersonic

• 0.8 < Mach No < 1.2

• Sonic flow

• Mach No > 5

• Incompressible/Subsonic

• Mach No = 1

In supersonic flow over a body, the lines at which the pressure disturbance is concentrated and which generate the cone are called

• Sound waves

• Disturbance waves

• Expansion waves

• Mach waves

Which of the following condition is true for an isentropic process?

• Frictionless adiabatic process

• change in entropy > 0

• change in entropy = 0

• Irreversible process

Which of the following is known as Compressible Bernoulli's equation

For a ________ perfect gas, Cp and Cv are constants and are independent of temperature.

Match the following

• impossible process

• change in entropy = 0

• reversible process

• change in entropy < 0

• irreversible process

• change in entropy > 0

Sound wave is a weak compression wave across which only infinitesimal changes in flow properties occur.​ Say True / False.

• True
• False

Shock waves are non-isentropic. Say True / False.

• True

• False

The ratio of local flow speed to the critical speed of sound is called _____ ____ number.

A converging flow passage will ____ the velocity of subsonic flow.

• decrease

• increase

• unalter