Fluid Mechanics MCQs

Question 1

Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics?

Accepted Answer

Hooke

Answer

Archimedes principle

Answer

Newton

Answer

None of the above

Question 2

What causes cavitation in centrifugal pump?

Accepted Answer

Low suction pressure

Answer

High suction pressure

Answer

Low barometric pressure

Answer

High suction velocity

Question 3

For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively).

Accepted Answer

B is above G

Answer

G is above B

Answer

B & G coincide

Answer

None of these

Question 4

The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

Accepted Answer

P, Q and R

Answer

P and R

Answer

R and S

Answer

P, R and S

Question 5

Momentum transfer in laminar flow of fluids results due to the

Accepted Answer

Velocity gradient

Answer

Viscosity

Answer

Density

Answer

None of these

Question 6

The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the

Accepted Answer

All of the above

Answer

Inverse of fluid viscosity

Answer

Square of particle size

Answer

Difference in the densities of the particle & fluid

Question 7

Cd is always __________ Cc.

Accepted Answer

Greater than

Answer

Less than

Answer

Equal to

Answer

Either more or less than

Question 8

Velocity distribution for flow between two fixed parallel plates

Accepted Answer

Varies parabolically across the section

Answer

Is constant over the entire cross-section

Answer

Is zero at the plates and increases linearly to the midplane

Answer

None of these

Question 9

A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is __________ hp.

Accepted Answer

1

Answer

$$\frac{{10}}{{55}}$$

Answer

5.5

Answer

$$\frac{1}{{55}}$$