Chemical Engineering MCQs

Page No. 793

Cold working of a material results in increase in hardness, which is termed as the ______________ hardening ?


aCold


bWork


cAge


dAge


View Answer Work

_____________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C ?


aBorosilicate


bHigh silica


cSupermax


dLead


View Answer Supermax

Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity) ____________________?


a1/k


bk


ck2


d1/k2


View Answer k

During sensible heating of humid air__________________?


aRelative humidity increases


bDew point remains constant


cDry bulb & wet bulb temperature increases


dBoth B & C


View Answer Both B & C

During sensible cooling of air, its wet bulb temperature ?


aDecreases but dew point remains constant


bIncreases but dew point remains constant


cIncreases & the dew point decreases


dDecreases & the dew point increases



Function of gear box is to____________________?


aReduce the speed


bObtain variable speed


cIncrease the speed


dProduce high torque


View Answer Obtain variable speed

Heat release during phase change is observed in case of a/an_________________?


aBoiler


bCondenser


cEvaporator


dAll A. B. & C.


View Answer Condenser

Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are _______________ respectively ?


a70 & 30


b30 & 70


c50 & 50


d90 & 10


View Answer 70 & 30

Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by _____________ have residual stresses ?


aForging


bCold rolling


cHot rolling


dCasting


View Answer Cold rolling

The excess air required for the combustion of pulverized coal is of the order of about _______________ percent ?


a5


b15


c30


d45


View Answer 15

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