Chemical Engineering MCQs

Page No. 210

Foot valves provided in pumps are ____________ valves?


aRelief


bThree/four way


cPressure reducing


dDirectional control


View Answer Directional control

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


aCapacity varies directly with


bHead varies as the square of


cHorsepower varies as the cube of


dAll A., B. and C.


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


bAbsolute roughness


cFriction co-efficient for flows at equal Reynold number


dAll A., B. & C.



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


aParabolic


bFlat


cFlat near the wall and parabolic in the middle


dParabolic near the wall and flat in the middle



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


aJet pump


bBlower


cAcid egg


dNone of these


View Answer Jet pump

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


a∂/∂s = 0


b∂/∂t = 0


c∂/∂s = constant


d∂/∂t = constant


View Answer ∂/∂t = 0

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


a1000 P’/S


b100 P’/S


c1000 S/P’


d10000 P’/S


View Answer 1000 P’/S

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


aM is above G


bM is below G


cM & G coincide


dNone of these


View Answer M is below G

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


a4000


b2100


c1500


d3000


View Answer 2100

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


aColebrook formula


bVon-Karman equation


cFanning equation


dNone of these


View Answer Von-Karman equation

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