A flow is called sub-sonic, if the Mach number is

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

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

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

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

The velocity for subsonic flow in a pipeline

A

Increases in the downstream direction

B

Is constant

C

Decreases in the downstream direction

D

Is independent of the area of flow

With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the

A

Velocity increases

B

Pressure decreases

C

Both A and B

D

Neither A nor B

The Mach number for hypersonic flow of compressible fluid is

A

1

B

> 1

C

> 4

For hypersonic flow, the Mach number is

A

Unity

B

Greater than unity

C

Greater than 2

D

Greater than 4

In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at

A

Diffuser inlet radius

B

Diffuser outlet radius

C

Impeller inlet radius

D

Impeller outlet radius

A flow is called sub-sonic, if the Mach number is

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