Fluid Mechanics - Chemical Engineering Questions and Answers

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Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively

efficiency, head and B.H.P.

head, efficiency and B.H.P.

B.H.P., efficiency and head

efficiency, B.H.P. and head

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Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head.

manometric

total

static

friction

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The speed of sound in an ideal gas varies as the

temperature

pressure

density

none of these

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The maximum head that can be developed by a single impeller is __________ ft.

100

250-300

1000

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The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is

< 1

> 1

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The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is

Q∝N : H∝N² : P∝N³

Q∝N² : H∝N³ : P∝N

Q∝N : H∝N³ : P∝N²

Q∝N³ : H∝N : P∝N²

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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 ?

0.5

0.67

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Foot valve provided in the pump is a __________ valve.

direction control

back pressure

relief

pressure reduction

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The discharge co-efficient for an orificemeter does not depend upon the

pipe length.

ratio of pipe diameter to orifice diameter.

type of orifice & the Reynolds number.

pipe diameter.