Chemical Engineering MCQs

Page No. 433

The energy radiated from a surface Q at absolute temperature T is related as__________________?


aQ ∝ T2


bQ ∝ T4


cQ ∝ T3


dNone of these


View Answer Q ∝ T4

Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?


aAluminium foil


bRefractory bricks


cIron plate


dCoke breeze


View Answer Coke breeze

Crystallisation of solids from a homogeneous solution is a/an ______________ process?


aExothermic


bMildly endothermic


cHighly endothermic


dNone of these


View Answer Exothermic

Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low___________________?


aHardness


bDissolved solids content


cSuspended solids content


dAll A., B. and C.


View Answer All A., B. and C.

_______________ paint has the maximum absorption coefficient ?


aBlack


bYellow


cWhite


dWhite


View Answer Black

Baffles are provided in heat exchangers to increase the________________?


aFouling factor


bHeat transfer area


cHeat transfer co-efficient


dHeat transfer rate



Prandtl and Reynold’s analogies are identical for Prandtl number value of__________________?


a0


b0.5


c1


d5


View Answer 1

The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________________?


aq = [2π k (Ti + T0)/2]/ln (ri/r0)


bq = 2π ri k (Ti – T0)/(r0/ri)


cq = 2π k (Ti – T0)/(r0/ri)


dq = 2π k (Ti – T0)/[(r0 + ri)/2]



If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________?


aIncrease by 1.8 times


bDecrease by 22


cIncrease by 216


dRemain unchanged


View Answer Increase by 216

A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number?


aCondensation


bGrashoff


cStanton


dBrinkman


View Answer Brinkman

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