Fluid Mechanics MCQ Questions & Answers

1

__________ forces do not act in case of fluid flow.

A) Elastic B) Tensile C) Vibratory D) Centrifugal

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

2

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

A) Intimate contact of the fluid with all parts of the solid particles B) Lower fluid pumping power requirement C) Minimisation of temperature variation D) Prevention of particle seggregation

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

3

Dimension of absolute viscosity is

A) ML^-1T^-1 B) MLT^-1 C) ML^-1T D) MLT

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

4

One dimensional fluid flow implies the

A) Flow in straight lines only B) Uniform flow C) Steady uniform flow D) Flow in which transverse components are zero

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

5

Molten soap mass is transported by a __________ pump.

A) Diaphragm B) Reciprocating C) Gear D) Centrifugal

Discuss

Answer & Solution

Answer: Option C

Solution:

Molten soap mass is a highly viscous fluid.

Gear pumps are positive displacement pumps that are highly effective for handling viscous fluids such as oils, syrups, and molten soap.

They operate by trapping the fluid in the cavities between the gear teeth and the pump casing, and transporting it from the inlet to the outlet side.

Diaphragm pumps are better suited for corrosive or slurry-type fluids, not necessarily viscous molten materials.

Reciprocating pumps are also positive displacement but are generally used for low flow, high-pressure applications and are less efficient with viscous fluids.

Centrifugal pumps are not suitable for high-viscosity fluids as their performance drops significantly.

Therefore, for molten soap mass, a gear pump is the most appropriate choice due to its ability to handle viscous materials efficiently.

6

Equivalent length of a pipe fitting is

A) Dependent on Reynolds number B) Independent of Reynolds number C) Dependent on the length of the pipe D) None of these

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

7

Pick out the correct statement pertaining to venturimeter.

A) A venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward B) The co-efficient of contraction of a venturimeter is always unity C) For a fixed pressure drop, the discharge of a gas through a venturimeter is greater, when compressibility is taken into account, than when it is neglected D) None of these

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

8

With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost

A) Increases B) Decreases C) Remains unchanged D) Increases exponentially

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

9

Self-priming centrifugal pump can be used for

A) Booster service B) Pumping liquid fertilisers (e.g. liquid NH₃) C) Pumping industrial wastes D) All of the above

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

10

For laminar flow of Newtonion fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, $$\mu $$ = fluid viscosity)

A) $$\mu $$ B) $$\frac{1}{\mu }$$ C) $$\sqrt \mu $$ D) $$\frac{1}{{\sqrt \mu }}$$

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Fluid Mechanics MCQ Questions & Answers | Chemical Engineering