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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