Fluid Mechanics MCQs

Question 1

Slugging occurs in a fluidised bed, if the bed is

Accepted Answer

Both A & B

Answer

Narrow

Answer

Deep

Answer

Neither A nor B

Question 2

A gas

Accepted Answer

Is a supercritical vapor

Answer

Signifies absence of density

Answer

Can resist shearing action

Answer

Is incompressible

Question 3

A mixed flow centrifugal pump

Accepted Answer

Employs such an impeller, through which the flow is a combination of radial & axial flow

Answer

Mixes the two fluids before pumping them

Answer

Pumps the two fluids separately and then mixes them

Answer

Employs impellers in both the radial & axial directions

Question 4

A Newtonion fluid is that

Accepted Answer

For which shear & deformation are related as $$	au = \mu \frac{{\partial {	ext{u}}}}{{\partial {	ext{y}}}}$$

Answer

Which follows Newton

Answer

Which needs a minimum shear, before it starts deforming

Answer

None of these

Question 5

With increase in the schedule number of a pipe of a particular nominal size, the

Accepted Answer

All of the above

Answer

Wall thickness also increases

Answer

I.D. of the pipe decreases

Answer

O.D. of the pipe remains constant

Question 6

A perfect gas

Accepted Answer

Has constant specific heat

Answer

Does not satisfy PV = nRT

Answer

Is incompressible and has zero viscosity

Answer

Can't develop shear stresses

Question 7

The schedule number of a pipe is an indication of its

Accepted Answer

Wall thickness

Answer

Size

Answer

Roughness

Answer

Material density

Question 8

A relief valve

Accepted Answer

Is a directional control valve

Answer

Provides back pressure for a cylinder

Answer

Unloads a pump

Answer

None of these

Question 9

A streamline is

Accepted Answer

Drawn normal to the velocity vector at every point

Answer

The line connecting the mid-points of flow cross-sections

Answer

Defined for uniform flow only

Answer

Always the path of a particle