Fluid Mechanics MCQs

Question 1

The peripherial velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec.

Accepted Answer

12.4

Answer

1.8

Answer

186.2

Answer

736.4

Question 2

Which of the following is not a dimension-less parameter?

Accepted Answer

None of these

Answer

Euler number

Answer

Specific gravity

Answer

Fanning friction factor

Question 3

Which of the following is not a dimension-less parameter?

Accepted Answer

Kinematic viscosity

Answer

Pressure-co-efficient

Answer

Froude number

Answer

Weber number

Question 4

The continuity equation

Accepted Answer

Relates mass flow rate along a stream tube

Answer

Relates work and energy

Answer

Stipulates that Newton's second law of motion must be satisfied at every point in the fluid

Answer

None of these

Question 5

Bernoulli's equation is not applicable, when the flow is

Accepted Answer

All of the above

Answer

Irrotational

Answer

Incompressible

Answer

Viscous

Question 6

Permanent pressure loss in a well designed venturimeter is about __________ percent of the venturi differential.

Accepted Answer

10

Answer

1

Answer

30

Answer

50

Question 7

The velocity profile exhibited by laminar flow of Newtonion fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an __________ with the apex at the centre line of the pipe.

Accepted Answer

Parabola

Answer

Hyperbola

Answer

Semi-circle

Answer

Semi-ellipse

Question 8

For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of

Accepted Answer

2

Answer

< 2

Answer

> 2

Answer

$$\frac{1}{2}$$

Question 9

Specific speed of a centrifugal pump relates it with another pump having the

Accepted Answer

Dynamic similarity

Answer

Same efficiency

Answer

Same speed

Answer

Geometrical similarity