Civil Engineering MCQs

Page No. 186

The losses are more in_________________?


alaminar flow

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b transition flow

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cturbulent flow

✓


dcritical flow

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View Answer turbulent flow

The maximum thickness of boundary layer in a pipe of radius r is____________________?


a 0

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br/2

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c r

✓


d2r

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View Answer r

Two pipe systems are said to be equivalent when_________________?


ahead loss and discharge are same in two systems

✓


blength of pipe and discharge are same in two systems

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c friction factor and length are same in two systems

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dlength and diameter are same in two systems

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The speed of a pressure wave through a pipe depends upon________________?


athe length of pipe

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bthe viscosity of fluid

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c the bulk modulus for the fluid

✓


d the original head

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Drag force is a function of________________?


aprojected area of the body

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bmass density of the fluid

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cvelocity of the body

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dAll of the above

✓


View Answer All of the above

For laminar flow in circular pipes, the Darcy’s friction factor f is equal to_________________?


a16/Re

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b32/ Re

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c 64/ Re

✓


dnone of the above where R,, is Reynolds number

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View Answer 64/ Re

The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is________________?


a1/3

✓


b1/4

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c1/2

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d2/3

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View Answer 1/3

If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be___________________?


afrom reservoir A to reservoirs B and C

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b from reservoir B to reservoirs C and A

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c from reservoir C to reservoirs A and B

✓


dunpredictable

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Surge wave in a rectangular channel is an example of_________________?


asteady flow

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bunsteady flow

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cA and C

✓


dnon-uniform flow

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View Answer A and C

The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is_________________?


ad > m > e

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bd > e > m

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ce > m > d

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d e > d > m

✓


View Answer e > d > m

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