Fluid Mechanics MCQ Questions & Answers

1

Pick out the wrong statement.

A) Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces B) A hydrometer used for the determination of specific gravities of liquids works on the principle of buoyant forces C) In case of unsteady fluid flow, the velocity at any given point does not change with time D) Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a point

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Answer & Solution

Answer: Option C

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2

In parallel pipe problems, the

A) Head loss is the same through each pipe B) Discharge is the same through all the pipes C) Total head loss is equal to the sum of the head losses through each pipe D) None of these

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Answer & Solution

Answer: Option A

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3

In turbulent flow, the

A) Fluid particles move in an orderly manner B) Momentum transfer is on molecular scale only C) Shear stress is caused more effectively by cohesion than momentum transfer D) Shear stresses are generally larger than in a similar laminar flow

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Answer & Solution

Answer: Option D

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4

The boundary layer is that part of a moving fluid, in which the fluid velocity is

A) Affected by the fluid flow pressure B) Constant C) Affected by the presence of a solid boundary D) All of the above

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Answer & Solution

Answer: Option C

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5

A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp).

A) Less head & capacity B) More head C) More capacity D) Less head & more capacity

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Answer & Solution

Answer: Option A

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6

Which of the following flow measuring devices is an area meter?

A) Venturimeter B) Orifice meter C) Anemometer D) Rotameter

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Answer & Solution

Answer: Option D

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7

For a given fluid flow rate, which of the following incurs maximum head loss?

A) Orifice meter B) Venturimeter C) Flow nozzle D) All of the above

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Answer & Solution

Answer: Option A

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8

A rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and rotameter shows the same reading, the flow rate (cc/sec) is

A) 26 B) 42 C) 269 D) 325

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Answer & Solution

Answer: Option C

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9

A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of __________ shape.

A) Circular B) Rectangular C) Triangular D) Trapezoidal

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Answer & Solution

Answer: Option A

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10

A stream tube is that, which has __________ cross-section entirely bounded by stream lines.

A) A circular B) Any convenient C) A small D) A large

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Answer & Solution

Answer: Option B

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering