Chemical Engineering MCQs

Page No. 247

In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow ?


aDischarge of water by a centrifugal pump being run at a constant rpm

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bWater flow in the suction and discharge pipe of a reciprocating pump

✓


cWater discharge from a vertical vessel in which constant level is maintained

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dLow velocity flow of a highly viscous liquid through a hydraulically smooth pipe

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The boundary layer is that part of a moving fluid, in which the fluid velocity is_________________?


aAffected by the fluid flow pressure

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bConstant

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cAffected by the presence of a solid boundary

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dAll A., B. and C.

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For turbulent flow of an incompressible fluid through a pipe, the flow rate „Q‟ is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent ‘n’ is_________________?


a1

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b0

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c< 1

✓


d> 1

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View Answer < 1

What is the value of Fanning friction factor f ‘ for smooth pipe at NRe = 106 approximately ?


a0.003

✓


b0.01

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c0.1

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d0.3

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View Answer 0.003

In the complete turbulence zone (in rough pipes), the____________________?


aRough and smooth pipes have the same friction factor

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bLaminar film covers the roughness projections

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cFriction factor depends upon NRe only

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dFriction factor is independent of the relative roughness

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Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around________________?


a2000

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b10

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c100

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d1000

✓


View Answer 1000

Equivalent length of a pipe fitting is____________________?


aDependent on Reynolds number

✓


bIndependent of Reynolds number

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cDependent on the length of the pipe

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dNone of these

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In deriving Bernoulli’s equation, fluid is assumed to be________________?


aIncompressible, frictionless, steady, along a streamline

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bUniform, steady, incompressible, along a streamline

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cSteady, density being pressure dependent, frictionless

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dNone of these

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Self-priming centrifugal pump can be used for________________?


aBooster service

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bPumping liquid fertilisers (e.g. liquid NH3)

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cPumping industrial wastes

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Discharge in laminar flow through a pipe varies________________?


aAs the square of the radius

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bInversely as the pressure drop

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cInversely as the viscosity

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dAs the square of the diameter

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