Chemical Engineering MCQs

Page No. 471

Nucleate boiling is promoted ___________________?


aOn polished surfaces


bOn rough surfaces


cIn the absence of agitation


dNone of these


View Answer On rough surfaces

At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?


a0.5


b< 0.5


c> 0.6


d< 0.1


View Answer > 0.6

The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is _____________________?


a1200 W/m2.K


b894 W/m2.K


c333 W/m2.K


d287 W/m2.K


View Answer 333 W/m2.K

Cpμ/K is termed as the ______________ number?


aGrashoff


bNusselt


cPrandtl


dStanton


View Answer Prandtl

In a single evaporator system, the steam economy ________________ by creating vacuum in the evaporator?


aIncreases


bDecreases


cRemain constant


dMay increase or decrease, depends on the vacuum


View Answer Increases

In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is ________________?


aMore


bLess


cSame


dMore or less; depends on the nature of solution


View Answer More

Maximum heat transfer rate is obtained in ______________ flow?


aLaminar


bTurbulent


cCreeping


dTransition region


View Answer Turbulent

Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?


at


b1/ρ


c1/A


dAll A., B. & C.


View Answer All A., B. & C.

In a shell and tube heat exchanger, floating head is used for _________________?


aLarge temperature differentials


bHigh heat transfer co-efficient


cLow pressure drop


dLess corrosion of tubes



Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid ___________________?


aFor fluids in laminar flow


bFor fluids in turbulent flow


cWhen Grashoff number is very important


dFor liquid metals



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