Fluid Mechanics MCQs

Question 1

The distribution of shear stress in a stream of fluid in a circular tube is

Accepted Answer

Linear with radius for both laminar & turbulent flow

Answer

Linear with radius for turbulent flow only

Answer

Linear with radius for laminar flow only

Answer

Parabolic with radius for both laminar & turbulent flow

Question 2

Purpose of hydraulic accumulator is to

Accepted Answer

Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc

Answer

Ensure intermittant supply of hydraulic pressure

Answer

Increase the pressure and store/ accumulate it

Answer

Accumulate pressure to increase force

Question 3

Which of the following properties of a fluid is responsible for offering resistance to shear?

Accepted Answer

Viscosity

Answer

Surface tension

Answer

Specific gravity

Answer

All of the above

Question 4

Which of the following is a Newtonian fluid?

Accepted Answer

Non-colloidal solution

Answer

Rubber latex

Answer

Sewage sludge

Answer

Quicksand

Question 5

An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic?

Accepted Answer

Sewage sludge

Answer

Rubber latex

Answer

Blood

Answer

Sugar solution

Question 6

Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.

Accepted Answer

Smaller than

Answer

Larger than

Answer

Same as

Answer

Twice

Question 7

Centrifugal pumps as compared to reciprocating pumps

Accepted Answer

Can be run with discharge line valve closed for a short interval

Answer

Run at a lower speed for the same discharge

Answer

Do not need priming

Answer

Deliver fluid with pulsating/fluctuating discharge

Question 8

In which of the following body shapes, the pressure drag is large compared to the friction drag?

Accepted Answer

Bluff body

Answer

Stream line body

Answer

Two dimensional body

Answer

None of these

Question 9

Which of the following denotes the effect of compressibility in fluid flow?

Accepted Answer

Mach number

Answer

Weber number

Answer

Euler number

Answer

Reynolds number