Fluid Mechanics MCQ Questions & Answers

21

The kinetic energy correction factor for velocity distribution of laminar flow is

A) 0.5 B) 1.66 C) 1 D) 2

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Answer & Solution

Answer: Option B

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22

The Navier-Stokes equation deals with the law of conservation of

A) Mass B) Energy C) Both A and B D) Momentum

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Answer & Solution

Answer: Option D

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23

Critical velocity in a pipe flow

A) Increases as fluid viscosity increases B) Increases as pipe diameter increases C) Independent of fluid density D) None of these

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Answer & Solution

Answer: Option B

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24

The simple pitot tube does not measure the

A) Static pressure B) Dynamic pressure C) Velocity at the stagnation point D) All of the above

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Answer & Solution

Answer: Option D

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25

Pick out the wrong statement.

A) A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity B) Newton's law of viscosity is not applicable to the turbulent flow of fluid with linear velocity distribution C) Laminar flow of viscous liquids is involved in the lubrication of various types of bearings D) Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes

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Answer & Solution

Answer: Option B

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26

The head loss in turbulent flow in pipe is proportional to (where, V = velocity of fluid through the pipe)

A) V² B) $$\frac{1}{{{{\text{V}}^2}}}$$ C) $$\frac{1}{{\text{V}}}$$ D) V

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Answer & Solution

Answer: Option A

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27

For pipe flows, head is proportional to __________ at constant capacity (where, D = pipe diameter).

A) $$\frac{1}{{\text{D}}}$$ B) $$\frac{1}{{{{\text{D}}^2}}}$$ C) $$\frac{1}{{{{\text{D}}^5}}}$$ D) D²

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Answer & Solution

Answer: Option C

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28

A centrifugal pump has the following specifications:
Power = 4 H.P.; Speed = 800 rpm
Head = 8 metres
Flow = 1000 litres/minutes.
If its speed is halved, the new discharge will be __________ litres/minute.

A) 500 B) 200 C) 1000 D) 750

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Answer & Solution

Answer: Option A

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29

Pick out the correct statement.

A) Fanning friction factor is inversely proportional to Reynolds number always B) The property of a randomly packed bed (with raschig rings) is given by the ratio of the total volume to the volume of voids in the bed C) Mach number in an incompressible fluid is always unity D) Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

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Answer & Solution

Answer: Option D

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30

Potential flow is characterised by the

A) Irrotational and frictionless flow B) Irrotational and frictional flow C) One in which dissipation of mechanical energy into heat occurs D) Formation of eddies within the stream

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Answer & Solution

Answer: Option A

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering