Hydraulics And Fluid Mechanics MCQ Questions & Answers

21

A streamline is defined as the line

A) parallel to central axis flow B) parallel to outer surface of pipe C) of equal yelocity in a flow D) along which the pressure drop is uniform

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Answer & Solution

Answer: Option C

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22

The two important forces for a floating body are

A) buoyancy, gravity B) buoyancy, pressure C) buoyancy, inertial D) inertial, gravity

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Answer & Solution

Answer: Option A

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23

The conditions for the stable equilibrium of a floating body are

A) the meta-center should lie above the center of gravity B) the center of buoyancy and the center of gravity must lie on the same vertical line C) a righting couple should be formed D) all the above are correct

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Answer & Solution

Answer: Option D

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24

A one dimensional flow is one which

A) is uniform flow B) is steady uniform flow C) takes place in straight lines D) involves zero transverse component of flow

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Answer & Solution

Answer: Option D

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25

The upper surface of a weir over which water flows is known is

A) crest B) nappe C) sill D) weir top

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Answer & Solution

Answer: Option A

Solution:

The upper surface of a weir over which water flows is called the crest.

The crest is the highest point of the weir, and it controls the flow of water over the structure.

The nappe refers to the sheet of water that flows over the weir crest.

The sill is the bottom edge or base of the weir structure, which supports the crest.

Weir top is not a technical term used in hydraulics and fluid mechanics.

Thus, the correct answer is crest.

26

In the case of steady flow of a fluid, the acceleration of any fluid particle is

A) constant B) variable C) zero D) zero under limiting conditions

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Answer & Solution

Answer: Option C

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27

Ratio of inertia force to elastic force is known as

A) Mach number B) Froude number C) Reynold’s number D) Weber’s number

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Answer & Solution

Answer: Option A

Solution:

The Mach number (Ma) represents the ratio of the speed of an object (such as an aircraft) to the speed of sound in the surrounding medium. It is used to characterize compressible flows, particularly in aerodynamics. The Mach number helps determine the behavior of fluid flows at high speeds where the effects of compressibility become significant.

28

The major loss of energy in long pipes is due to

A) sudden enlargement B) sudden contraction C) gradual contraction or enlargement D) friction

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Answer & Solution

Answer: Option D

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29

For very great pressures, viscosity of moss gases and liquids

A) remains same B) increases C) decreases D) shows erratic behaviour

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Answer & Solution

Answer: Option D

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30

Which of the following manometer has highest sensitivity

A) U-tube with water B) inclined U-tube C) U-tube with mercury D) micro-manometer with water

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Answer & Solution

Answer: Option D

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Hydraulics And Fluid Mechanics MCQ Questions & Answers | Civil Engineering