Related Questions

Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible?
A [

A.

B. > 3

B 50
C 1
The respective ratio between the speed of a speed of the car, bus and train is 5 : 9 : 6. The average speed of the car, bus and train is 72 km/hr together. What is the average speed (km/h)of the car and the train together?
A 82
B 72
C 67
D 84
When the Mach number is between --------the flow is called supe-sonic flow.
A 1 and 6
B 4 and 6
C 2.5 and 4
D 1 and 2.5
When the Mach number is between __________ the flow is called super-sonic flow.
A 1 and 2.5
B 2.5 and 4
C 4 and 6
D 1 and 6
The Mach number for hypersonic flow of compressible fluid is
A 1
B > 1
C > 4
When the Mach number is less than unity, the flow is called
A Sub-sonic flow
B Sonic flow
C Super-sonic flow
D Hyper-sonic flow
For hypersonic flow, the Mach number is
A Unity
B Greater than unity
C Greater than 2
D Greater than 4
A flow is called hyper-sonic, if the Mach number is
A Less than unity
B Unity
C Between 1 and 6
D None of these
A flow is called sub-sonic, if the Mach number is
A Less than unity
B Unity
C Between 1 and 6
D More than 6
Mach number is significant in
A Supersonics, as with projectiles and jet propulsion
B Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
C Simultaneous motion through two fluids where there is a surface of discontinuity, gravity force, and wave making effects, as with ship's hulls
D All of the above

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