Chemical Engineering MCQs

Page No. 438

At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?


a1


b0


cNone of these


d2


View Answer 1

Heat transfer by natural convection is enhanced in system with__________________?


aHigh viscosity


bHigh co-efficient of thermal expansion


cLow temperature gradients


dLow density change with temperature



Reynold’s analogy states that (where, St = Stanton number f = friction factor) ?


aSt = f/2


bSt = f/4


cSt = 4f


dSt = f1/2


View Answer St = f/2

A dephlegmator is a_____________________?


aTotal condenser


bVacuum evaporator


cPartial condenser


dDouble pipe heat exchanger


View Answer Partial condenser

Film boiling is usually not desired in commercial equipments, because____________________?


aThe heat transfer rate is low in view of the large temperature drop


bIt is difficult to maintain


cIt is not economic


dNone of these



The advantage of backward feed multiple effect evaporators over forward feed units is that___________________?


aHeat sensitive material can be handled


bThere is no additional cost of pumping


cMost concentrated liquid is at highest temperature


dEqual heat transfer co-efficients exist in various effects



In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side ______________ the heat transfer rate?


aIncreases


bDecreases


cDoes not affect


dMay increase or decrease, depends on the type of baffle


View Answer Increases

With the increase of temperature, the Col-burn jH factor_____________________?


aIncreases


bDecreases


cRemains unchanged


dMay increase or decrease; depending on temperature


View Answer Increases

Electromagnetic radiations propagate in vacuum with a velocity of _______________ metre/second?


a3 × 105


b3 × 108


c3 × 1010


d3 × 1012


View Answer 3 × 108

In a heat exchanger, floating head is provided to____________________?


aFacilitate cleaning of the exchanger


bIncrease the heat transfer area


cRelieve stresses caused by thermal expansion


dIncrease log mean temperature gradient



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