Upto what value of 'Mach number', a fluid may be considered as incompressible?

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

For ideally incompressible fluid, the Mach number will be

A

1.5

B

1

C

0

D

5

In an incompressible flow of fluid, the fluid

A

Temperature remains constant

B

Compressibility is greater than zero

C

Density does not change with pressure & temperature

D

Is frictionless

For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent 'n' is

A

1

B

0

C

> 1

In an incompressible fluid, the density is

A

Greatly affected by moderate changes in pressure

B

Greatly affected only by moderate changes in temperature

C

Not affected with moderate change in temperature & pressure

D

Sensible to changes in both temperature & pressure

For an incompressible fluid, the bulk modulus of elasticity is

A

5 kg/m³

B

$$\infty $$ N/m²

C

1 N

D

0 N/m

With the increase in depth, the hydrostatic pressure in an unaccelerated incompressible fluid (in a constant gravitational field)

A

Decreases

B

Increases linearly

C

Increases exponentially

D

Remains constant

The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream

A

Keeps on increasing

B

Keeps on decreasing

C

Remain constant

D

May increase/decrease

The internal energy of an incompressible fluid depends upon its

A

Pressure

B

Temperature

C

Both A & B

D

Neither A nor B

For an incompressible fluid, the __________ is a function of both pressure as well as temperature.

A

Internal energy

B

Enthalpy

C

Entropy

D

All of the above

Upto what value of 'Mach number', a fluid may be considered as incompressible?

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