Chemical Engineering MCQs

Page No. 237

The distribution of shear stress in a stream of fluid in a circular tube is_____________________?


aLinear with radius for turbulent flow only

✖


bLinear with radius for laminar flow only

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cLinear with radius for both laminar & turbulent flow

✓


dParabolic with radius for both laminar & turbulent flow

✖



The ratio of actual discharge to theoretical discharge through an orifice is equal to______________?


aCc . Cv

✓


bCc . Cd

✖


cCv . Cd

✖


dCd/Cv

✖


View Answer Cc . Cv

The Prandtl mixing length is_________________?


aZero at the pipe wall and is a universal constant

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bIndependent of radial distance from the pipe axis

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cIndependent of the shear stress

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dUseful for computing laminar flow problems

✓



In hindered settling, the particles are_________________________?


aPlaced farther from the wall

✖


bNot affected by other particles and the wall

✖


cNear each other

✓


dNone of these

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View Answer Near each other

The component of acceleration resulting due to unsteady nature of flow is called ____________ acceleration?


aNormal

✖


bLocal

✓


cConvective

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dTangential

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View Answer Local

The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by_____________________?


aCv . √(2gH)

✓


bCc . √(2gH)

✖


cCd . √(2gH)

✖


dCv . Va

✖


View Answer Cv . √(2gH)

Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a _________________?


aPitot tube

✓


bManometer

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cRotameter

✖


dNone of these

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View Answer Pitot tube

The losses in open channel flow generally vary as the ________________?


aInverse of the roughness

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bFirst power of the roughness

✓


cSquare of the velocity

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dInverse square of hydraulic radius

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The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids ?


aHaving high viscosities

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bMoving at low velocities

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cBoth A. & B.

✓


dNeither A. nor B.

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View Answer Both A. & B.

Potential function is applicable only for __________ flow?


aIrrotational

✓


bTurbulent

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cSteady

✖


dNone of these

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View Answer Irrotational

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