Fluid Mechanics MCQs

Question 1

Check valves are used

Accepted Answer

For unidirectional flow

Answer

At high pressure

Answer

In bends

Answer

For controlling water flow

Question 2

Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its

Accepted Answer

Neither inner nor outer diameter

Answer

Inner diameter

Answer

Outer diameter

Answer

Thickness

Question 3

Experimental study of laminar fluid flow through a circular tube was conducted by

Accepted Answer

Hagen and Poiseuille

Answer

Reynolds

Answer

Pascal

Answer

Blake-Plummer

Question 4

Centrifugal pump is normally classified on the basis of the

Accepted Answer

Type of casing

Answer

Rpm

Answer

Impeller blade angle

Answer

Number of blades in impeller

Question 5

The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is

Accepted Answer

2

Answer

0.5

Answer

1

Answer

0.33

Question 6

Cocks are used to control

Accepted Answer

Any liquid

Answer

Water

Answer

Solids

Answer

None of these

Question 7

The fluid jet discharging from a 2" diameter orifice has a diameter of 1.75" at its vena-contracta. The co-efficient of contraction is

Accepted Answer

0.766

Answer

1.3

Answer

0.87

Answer

None of these

Question 8

What is the normal range of exit cone angle of a venturimeter?

Accepted Answer

7 to 15

Answer

2 to 5

Answer

15 to 25

Answer

>25

Question 9

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

Accepted Answer

0.3

Answer

0.03

Answer

3

Answer

10