Chemical Engineering MCQs

Page No. 433

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


aQ ∝ T2

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bQ ∝ T4

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cQ ∝ T3

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dNone of these

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View Answer Q ∝ T4

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


aAluminium foil

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bRefractory bricks

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cIron plate

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dCoke breeze

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View Answer Coke breeze

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


aExothermic

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bMildly endothermic

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cHighly endothermic

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dNone of these

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View Answer Exothermic

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


aHardness

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bDissolved solids content

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cSuspended solids content

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dAll A., B. and C.

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View Answer All A., B. and C.

_______________ paint has the maximum absorption coefficient ?


aBlack

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bYellow

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cWhite

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dWhite

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View Answer Black

Baffles are provided in heat exchangers to increase the________________?


aFouling factor

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bHeat transfer area

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cHeat transfer co-efficient

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dHeat transfer rate

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


a0

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b0.5

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c1

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d5

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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)

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bq = 2π ri k (Ti – T0)/(r0/ri)

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cq = 2π k (Ti – T0)/(r0/ri)

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dq = 2π k (Ti – T0)/[(r0 + ri)/2]

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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

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bDecrease by 22

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cIncrease by 216

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dRemain unchanged

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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

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bGrashoff

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cStanton

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dBrinkman

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View Answer Brinkman

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