Fluid Mechanics MCQ Questions & Answers

31

Air vessel fitted to a reciprocating pump

A) Increases the work done B) Decreases the work done C) Causes cavitation D) Results in non-uniform discharge

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Answer & Solution

Answer: Option B

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32

Hydraulic diameter for non-circular ducts is equal to __________ times the area of flow divided by the perimeter.

A) Two B) Three C) Four D) Eight

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Answer & Solution

Answer: Option C

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33

Momentum correction factor used in fluid flow problems accounts for the

A) Change in direction of flow B) Change in total energy C) Change in pressure D) Non uniform direction of velocities at inlet & outlet sections

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Answer & Solution

Answer: Option D

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34

What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)?

A) 0.5 B) 1 C) 1.5 D) 2

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Answer & Solution

Answer: Option D

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35

What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition?

A) 0.5 B) 0.67 C) 1 D) 2

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Answer & Solution

Answer: Option D

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36

Deformation drag, which is caused by widespread deformation of fluid around the immersed body

A) Occurs when N_Re is very small B) Is primarily a friction drag C) Is independent of body length D) Depends mainly on cross-sectional shape

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Answer & Solution

Answer: Option A

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37

For an ideal fluid flow, Reynolds number is

A) 2100 B) 100 C) 0 D) ∞

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Answer & Solution

Answer: Option D

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38

For ideally incompressible fluid, the Mach number will be

A) 1.5 B) 1 C) 0 D) 5

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Answer & Solution

Answer: Option C

Solution:

The Mach number ($${Ma}$$) is a dimensionless quantity representing the ratio of the speed of an object (or fluid) to the speed of sound in the medium through which it is traveling. It is defined as:

$${Ma} = \frac{v}{c}$$

where:
$${v}$$ is the velocity of the object or fluid.
$${c}$$ is the speed of sound in the medium.

For ideally incompressible fluids, the speed of sound is infinite, and thus the Mach number ($${Ma}$$) is zero. This is because in an incompressible fluid, changes in pressure do not affect the density of the fluid. Therefore, the speed of sound in such a fluid is infinitely high, and any velocity of the fluid will result in a Mach number of zero.

Therefore, the correct answer is Option C: 0.

39

Ratio of pressure and inertia force gives __________ number.

A) Weber B) Mach C) Euler D) Froude

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Answer & Solution

Answer: Option C

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40

Froude number is not a factor

A) For Reynolds number greater than 300 B) When there is no vortex formation C) For unbaffled tank D) None of these

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Answer & Solution

Answer: Option B

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering