Fluid Mechanics - Section 1 (5)

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Fluid Mechanics - Section 1

There are many problems and MCQs available on Fluid mechanics which
you can solve easily to test your aptitude in fluid mechanic field.

33.

The terminal velocity of a small sphere settling in a viscous fluid varies as the

A.	first power of its dimeter.
B.	inverse of the fluid viscosity.
C.	inverse square of the diameter.
D.	square of the difference in specific weights of solid & fluid.

Answer: Option B

Explanation:

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34.

Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.

A.	smaller than
B.	larger than
C.	same as
D.	twice

Answer: Option A

Explanation:

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35.

Which of the following denotes the effect of compressibility in fluid flow ?

A.	Weber number
B.	Mach number
C.	Euler number
D.	Reynolds number

Answer: Option B

Explanation:

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36.

Molten soap mass is transported by a __________ pump.

A.	diaphragm
B.	reciprocating
C.	gear
D.	centrifugal

Answer: Option D

Explanation:

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37.

Water hammer in a pipeline results from the

A.	bursting of pipelines due to closure by a valve.
B.	rapid pressure change due to a rapid change in the rate of flow.
C.	pressure increase due to closure of a valve resulting in decrease in rate of flow.
D.	none of these.

Answer: Option B

Explanation:

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38.

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 (a), (b) & (c).

Answer: Option C

Explanation:

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39.

The velocity profile for turbulent flow through a closed conduit is

A.	logarithmic
B.	parabolic
C.	hyperbolic
D.	linear

Answer: Option A

Explanation:

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40.

With increasing flow rate, the hydraulic efficiency of a centrifugal pump

A.	monotonically decreases.
B.	decreases and then increases.
C.	remains constant.
D.	increases and then decreases.

Answer: Option A

Explanation:

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