Chemical Engineering MCQs

Page No. 235

Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.) ?


a√d

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bd1/3

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cd2

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dd2/3

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View Answer √d

____________ flow means the flow of incompressible fluid with no shear ?


aPotential

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bStreamline

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cCreep

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dBoundary layer

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View Answer Potential

Centrifugal pump can’t be used to pump _____________________?


aMolten sodium (used as a coolant in Fast Breeder Reactor)

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bModerately viscous vegetable oil used in soap industry

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cThick molten soap at 80°C

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dNone of the above

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A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of _______________ shape?


aCircular

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bRectangular

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cTriangular

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dTrapezoidal

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View Answer Circular

An ideal fluid is___________________?


aFrictionless & incompressible

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bOne, which obeys Newton’s law of viscosity

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cHighly viscous

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dNone of these

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______________ is an example of axial flow impeller?


aPaddle

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bTurbine

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cPropeller

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dAll A., B. and C.

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View Answer Propeller

The distance between metacentre and ______________ is called metacentric height?


aWater surface

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bCentre of gravity

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cCentre of buoyancy

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dNone of these

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View Answer Centre of gravity

Enamels and paints are generally _______________ fluid?


aRheopectic

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bPseudo-plastic

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cThixotropic

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dDilatant

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View Answer Pseudo-plastic

A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, then the new head will be ______________ metres?


a2

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b4

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c8

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d5.5

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View Answer 2

The Reynolds number for an ideal fluid flow is _________________?


a4

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b2100-40004000

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c4000

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d∞

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View Answer ∞

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