Fluid Mechanics MCQs

Question 1

Pick out the wrong statement about cavitation.

Accepted Answer

Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades

Answer

Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation

Answer

Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities

Answer

Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise

Question 2

__________ forces act on a particle moving through a stationary fluid.

Accepted Answer

All of the above

Answer

Gravity

Answer

Drag

Answer

Buoyant

Question 3

Stoke's law is valid, when NRe,p is less than

Accepted Answer

2

Answer

100

Answer

2100

Answer

700

Question 4

Pick out the wrong statement.

Accepted Answer

The eddy viscosity is a fluid property

Answer

The eddy viscosity is a function of the type of turbulence involved

Answer

The viscosity of gas increases with increase in temperature

Answer

The viscosity of a liquid increases with decrease in temperature

Question 5

Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm.

Accepted Answer

> 12.5

Answer

< 4

Answer

> 4

Answer

< 10

Question 6

__________ forces do not act in case of fluid flow.

Accepted Answer

Tensile

Answer

Elastic

Answer

Vibratory

Answer

Centrifugal

Question 7

Which of the following is not an advantage of fluidisation from transfer operation point of view?

Accepted Answer

Lower fluid pumping power requirement

Answer

Intimate contact of the fluid with all parts of the solid particles

Answer

Minimisation of temperature variation

Answer

Prevention of particle seggregation

Question 8

Dimension of absolute viscosity is

Accepted Answer

ML-1T-1

Answer

MLT-1

Answer

ML-1T

Answer

MLT

Question 9

One dimensional fluid flow implies the

Accepted Answer

Flow in which transverse components are zero

Answer

Flow in straight lines only

Answer

Uniform flow

Answer

Steady uniform flow