Fluid Mechanics Multiple Choice Questions – Pipe Flow Applications

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1. A flow is said to be laminar when :

Dated: 15 Nov, 2018

Attempts: 52

Corrects: 41

Wrongs: 11

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the fluid particles move in layers parallel to the boundary
2. *For the laminar flow through a circular pipe :

Dated: 15 Nov, 2018

Attempts: 47

Corrects: 20

Wrongs: 27

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the maximum velocity = 2 times the average velocity
3.

The loss of pressure head for the laminar flow through pipe varies :

Dated: 20 Nov, 2018

Attempts: 44

Corrects: 14

Wrongs: 30

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directly as velocity
4.

For the laminar flow through a pipe, the shear stress over the cross-section :

Dated: 20 Nov, 2018

Attempts: 35

Corrects: 9

Wrongs: 26

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varies directly as the distance from the center of the pipe
5.

*For the laminar flow between two parallel plates :

Dated: 20 Nov, 2018

Attempts: 27

Corrects: 4

Wrongs: 23

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None of the above
6.

*The value of the kinetic energy correction factor α of the laminar flow through a circular pipe is :

Dated: 20 Nov, 2018

Attempts: 23

Corrects: 7

Wrongs: 16

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2
7.

*The value of the momentum correction factor β for the laminar flow through a circular pipe is :

Dated: 20 Nov, 2018

Attempts: 16

Corrects: 6

Wrongs: 10

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1.33
8.

The pressure drop per unit length of a pipe for laminar flow is :

Dated: 20 Nov, 2018

Attempts: 17

Corrects: 0

Wrongs: 17

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\[\begin{array}{l} f = \frac{{64}}{{{{\mathop{\rm R}\nolimits} _e}}},{{\mathop{\rm R}\nolimits} _e} = \frac{{\rho vD}}{\mu }\\ f = \frac{{64\mu }}{{\rho vD}}\\ {h_f}/L = \frac{f}{D} \times \frac{{{v^2}}}{{2g}}\\ {h_f}/L = \frac{{64\mu }}{{\rho vD}} \times \frac{1}{D} \times \frac{{{v^2}}}{{2g}} = \frac{{32\mu v}}{{\rho g{D^2}}} \end{array}\]
\[\frac{{12\mu vL}}{{\rho g{D^2}}}\]
9.

*For laminar flow between two parallel plates, the pressure drop per unit length is equal to :

Dated: 20 Nov, 2018

Attempts: 14

Corrects: 0

Wrongs: 14

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\[\frac{{12\mu v}}{{{D^2}}}\]
10.

The velocity distribution in laminar flow through a circular pipe follow the :

Dated: 20 Nov, 2018

Attempts: 26

Corrects: 18

Wrongs: 8

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parabolic law
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