Chemical Engineering MCQs

Page No. 246

Viscosity of water at 40°C lies in the range of___________________?


a1 × 10-3 to 2 × 10-3 kg/m.s


b0.5 × 10-3 to 1 × 10-3 kg/m.s


c1 to 2 kg/m.s


d0.5 to 1 kg/m.s



Prandtl mixing length is___________________?


aApplicable to laminar flow problems


bA universal constant


cZero at the pipe wall


dNone of these


View Answer Zero at the pipe wall

The pressure co-efficient is the ratio of pressure forces to ______________ forces?


aViscous


bInertial


cGravity


dSurface tension


View Answer Viscous

In magnetic flow meters, voltage generation is________________?


aDue to the motion of conducting fluid through an externally generated uniform field


bProportional to the fluid velocity


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Which of the following is a Newtonian fluid ?


aRubber latex


bSewage sludge


cQuicksand


dNon-colloidal solution



In which of the following body shapes, the pressure drag is large compared to the friction drag ?


aStream line body


bTwo dimensional body


cBluff body


dNone of these


View Answer Bluff body

Pressure drop in a fluidised bed reactor is ______________ that in a similar packed bed reactor?


aLess than


bGreater than


cSame as


dNone of these


View Answer Greater than

When the water is warm, the height to which it can be lifted by a pump_________________?


aDecreases due to reduced viscosity


bDecreases due to reduced vapour pressure


cIncreases due to increased vapour pressure


dDecreases due to increased frictional resistance



In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes_______________?


aLess than atmospheric pressure


bMore than liquid vapor pressure


cLess than liquid vapor pressure


dMore than atmospheric pressure



Which of the following is the most common pump for pumping either raw sewage or sludge ?


aElectromagnetic pump


bCentrifugal pump


cReciprocating pump


dGear pump


View Answer Reciprocating pump

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