Chemical Engineering MCQs

Page No. 436

In a backward feed multiple effect evaporator ___________________ ?


aFeed is introduced in the first effect


bFeed flows from low pressure to high pressure


cNo pumps are required between successive effects


dNone of these



The sum of reflectivity and absorptivity for an opaque body is equal to____________________?


a0.5


b1


c0


d2


View Answer 1

Steam is routed through the tube in case of a ______________ evaporator?


aBasket type


bHorizontal tube


cShort tube vertical


dLong tube vertical


View Answer Horizontal tube

Multiple effect evaporation is generally recommended, when the______________________?


aLarge scale evaporation of liquor is needed


bCorrosive liquids are to be concentrated


cFuel is cheaply available


dEvaporation on small scale is to be done



1 BTU/hr.ft.°F is equal to _____________ kcal/hr. m.°C?


a1.49


b1


c4.88


dNone of these


View Answer 1.49

A _____________ surface has the maximum thermal emissivity out of the following ?


aBlack & smooth


bBlack & rough


cWhite & smooth


dWhite & rough


View Answer Black & rough

A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case ?


aThe cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant


bBoth the spheres will emit equal amount of radiation per unit time in the beginning


cBoth will absorb equal amount of radiation from the surrounding in the beginning


dBoth B. & C.


View Answer Both B. & C.

Which of the following has the highest thermal conductivity ?


aBrick


bAir


cWater


dSilver


View Answer Silver

Circulation pump is located below the evaporator to___________________?


aAvoid cavitation


bAvoid frequent priming


cCreate more suction head


dNone of these



Economy of an evaporator is influenced by the_____________________?


aSteam pressure


bFeed temperature


cNumber of effect


dBoth B. & C.


View Answer Both B. & C.

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