Fluid Mechanics MCQs

Question 1

What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)?

Accepted Answer

2

Answer

0.5

Answer

1

Answer

1.5

Question 2

What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition?

Accepted Answer

2

Answer

0.5

Answer

0.67

Answer

1

Question 3

Deformation drag, which is caused by widespread deformation of fluid around the immersed body

Accepted Answer

Occurs when NRe is very small

Answer

Is primarily a friction drag

Answer

Is independent of body length

Answer

Depends mainly on cross-sectional shape

Question 4

For an ideal fluid flow, Reynolds number is

Accepted Answer

∞

Answer

2100

Answer

100

Answer

0

Question 5

For ideally incompressible fluid, the Mach number will be

Accepted Answer

0

Answer

1.5

Answer

1

Answer

5

Question 6

Ratio of pressure and inertia force gives __________ number.

Accepted Answer

Euler

Answer

Weber

Answer

Mach

Answer

Froude

Question 7

Froude number is not a factor

Accepted Answer

When there is no vortex formation

Answer

For Reynolds number greater than 300

Answer

For unbaffled tank

Answer

None of these

Question 8

Froude number is the ratio of

Accepted Answer

Inertial stress to gravitational stress

Answer

Shear stress to gravitational stress

Answer

Drag stress to shear stress

Answer

Inertial stress to shear stress

Question 9

Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings.

Accepted Answer

Both A and B

Answer

Incompressible

Answer

Non-viscous

Answer

Neither A nor B