Fluid Mechanics MCQ Questions & Answers

21

Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics?

A) Archimedes principle B) Newton C) Hooke D) None of the above

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Answer & Solution

Answer: Option C

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22

What causes cavitation in centrifugal pump?

A) High suction pressure B) Low barometric pressure C) Low suction pressure D) High suction velocity

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Answer & Solution

Answer: Option C

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23

For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively).

A) G is above B B) B is above G C) B & G coincide D) None of these

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Answer & Solution

Answer: Option B

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24

The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

A) P, Q and R B) P and R C) R and S D) P, R and S

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Answer & Solution

Answer: Option A

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25

Momentum transfer in laminar flow of fluids results due to the

A) Viscosity B) Density C) Velocity gradient D) None of these

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Answer: Option C

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26

The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the

A) Inverse of fluid viscosity B) Square of particle size C) Difference in the densities of the particle & fluid D) All of the above

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Answer & Solution

Answer: Option D

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27

C_d is always __________ C_c.

A) Greater than B) Less than C) Equal to D) Either more or less than

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Answer & Solution

Answer: Option A

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28

Velocity distribution for flow between two fixed parallel plates

A) Varies parabolically across the section B) Is constant over the entire cross-section C) Is zero at the plates and increases linearly to the midplane D) None of these

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Answer & Solution

Answer: Option A

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29

A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is __________ hp.

A) 1 B) $$\frac{{10}}{{55}}$$ C) 5.5 D) $$\frac{1}{{55}}$$

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Answer & Solution

Answer: Option A

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30

In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

A) Relative roughness B) Absolute roughness C) Friction co-efficient for flows at equal Reynold number D) All of the above

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Answer: Option C

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering