Chemical Engineering MCQs

Page No. 210

Foot valves provided in pumps are ____________ valves?


aRelief

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bThree/four way

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cPressure reducing

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dDirectional control

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View Answer Directional control

At a constant speed of the centrifugal pump, it‟s _____________ the impeller diameter?


aCapacity varies directly with

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bHead varies as the square of

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cHorsepower varies as the cube of

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dAll A., B. and C.

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View Answer All A., B. and C.

In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of___________________?


aRelative roughness

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bAbsolute roughness

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cFriction co-efficient for flows at equal Reynold number

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dAll A., B. & C.

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The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is__________________?


aParabolic

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bFlat

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cFlat near the wall and parabolic in the middle

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dParabolic near the wall and flat in the middle

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When the momentum of one fluid is used for moving another fluid, such a device is called a/an______________?


aJet pump

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bBlower

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cAcid egg

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dNone of these

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View Answer Jet pump

Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition.


a∂/∂s = 0

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b∂/∂t = 0

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c∂/∂s = constant

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d∂/∂t = constant

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View Answer ∂/∂t = 0

Schedule number of a pipe, which is a measure of its wall thickness, is given by ________________?


a1000 P’/S

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b100 P’/S

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c1000 S/P’

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d10000 P’/S

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View Answer 1000 P’/S

For an unstable equilibrium of a floating body (where, M = metacentre.) ?


aM is above G

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bM is below G

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cM & G coincide

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dNone of these

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View Answer M is below G

Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds___________________?


a4000

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b2100

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c1500

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d3000

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View Answer 2100

The equation f-0.5 = 4.07 loge (NRe √f)-0.6 is called the ____________?


aColebrook formula

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bVon-Karman equation

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cFanning equation

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dNone of these

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View Answer Von-Karman equation

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