Chemical Engineering MCQs

Page No. 149

A globe valve is the most suitable for applications, in which____________________?


aFluid flow control is required

✓


bFluid contains dispersed solid particles

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cValve is required to be either fully open or fully closed

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dOne way flow is required

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Buckingham-π theorem states that in any physical problem including ‘n’ quantities having ‘m’ dimensions, the quantities can be arranged into _____________ independent dimensionless parameters?


am

✖


bn

✖


cn-m

✓


dn/m

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View Answer n-m

When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________?


aEjector

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bBlower

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cInjector

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dAirlift

✓


View Answer Airlift

The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?


a√(HW/π)

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bHW/2 (H + W)2

✓


cHW/4 (H + W)2

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d2HW/(H + W)

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View Answer HW/2 (H + W)2

At the critical point of a substance____________?


aThe surface tension vanishes

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bLiquid and vapour have the same density

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cThere is no distinction between liquid and vapour phases

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dAll A, B. and C

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View Answer All A, B. and C

Permanent pressure loss in a well designed Venturimeter is about _____________ percent of the venturi differential?


a1

✖


b10

✓


c30

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d50

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View Answer 10

For any system, what is the minimum number of degrees of freedom ?


a0

✓


b1

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c2

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d3

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View Answer 0

For an ideal fluid flow, Reynolds number is___________________?


a2100

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b100

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c0

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d∞

✓


View Answer ∞

What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope ?


a0

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b 1

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c 2

✓


d 3

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View Answer 2

The lift of a balloon is_________________?


aIncreased, as it rises to a higher altitude

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bDue to the weight of the atmospheric air, that it displaces

✓


cNot dependent on the temperature of the atmosphere

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dNone of these

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