Fluid Mechanics MCQs

Question 1

For laminar flow of Newtonion fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship.

Accepted Answer

Parabolic

Answer

Logarithmic

Answer

Hyperbolic

Answer

Linear

Question 2

For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance 'd' measured from the wall of the pipe and the friction velocity 'v', and it follows a __________ relationship.

Accepted Answer

Logarithmic

Answer

Linear

Answer

Hyperbolic

Answer

Parabolic

Question 3

The head developed by a centrifugal pump is largely determined by the

Accepted Answer

Angle of the vanes and the speed of the tip of the impeller

Answer

Power of the pump

Answer

Nature of the liquid being pumped

Answer

Vapour pressure of the liquid

Question 4

Cavitation occurs in a centrifugal pump when the suction pressure is

Accepted Answer

Less than the vapour pressure of the liquid at that temperature

Answer

Greater than the vapour pressure of the liquid at that temperature

Answer

Equal to the vapour pressure

Answer

Equal to the developed head

Question 5

Draining of shallow pits or sump is done by a sump pump, which is a __________ pump.

Accepted Answer

Single stage vertical

Answer

Centrifugal

Answer

Plunger

Answer

Diffuser

Question 6

Specific speed for a centrifugal pump is

Accepted Answer

$$\frac{{{	ext{N}}\sqrt {	ext{Q}} }}{{{{	ext{H}}^{\frac{3}{4}}}}}$$

Answer

$$\frac{{{	ext{N}}\sqrt {	ext{Q}} }}{{{{	ext{H}}^{\frac{2}{3}}}}}$$

Answer

$$\frac{{{	ext{N}}\sqrt {	ext{Q}} }}{{{{	ext{H}}^{\frac{1}{4}}}}}$$

Answer

$$\frac{{{	ext{N}}\sqrt {	ext{Q}} }}{{	ext{H}}}$$

Question 7

Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an

Accepted Answer

Hot wire anemometer

Answer

Weir

Answer

Cup and vane aneometer

Answer

None of these

Question 8

Which of the following is an undesirable property of a manometric liquid?

Accepted Answer

High vapour pressure

Answer

Non-sticky & non-corrosive nature

Answer

Low viscosity & surface tension

Answer

Low co-efficient of thermal expansion

Question 9

Pick out the wrong statement.

Accepted Answer

Both B and C

Answer

Momentum transfer in laminar flow results from veclocity gradient

Answer

A fluid in equilibrium is not free from shear stress

Answer

The viscosity of a non-Newtonion fluid is a function of temperature only