Chemical Engineering MCQs

Page No. 793

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


aCold

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bWork

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cAge

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dAge

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View Answer Work

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


aBorosilicate

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bHigh silica

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cSupermax

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dLead

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View Answer Supermax

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


a1/k

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bk

✓


ck2

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d1/k2

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View Answer k

During sensible heating of humid air__________________?


aRelative humidity increases

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bDew point remains constant

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cDry bulb & wet bulb temperature increases

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dBoth B & C

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View Answer Both B & C

During sensible cooling of air, its wet bulb temperature ?


aDecreases but dew point remains constant

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bIncreases but dew point remains constant

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cIncreases & the dew point decreases

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dDecreases & the dew point increases

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Function of gear box is to____________________?


aReduce the speed

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bObtain variable speed

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cIncrease the speed

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dProduce high torque

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View Answer Obtain variable speed

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


aBoiler

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bCondenser

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cEvaporator

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dAll A. B. & C.

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View Answer Condenser

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


a70 & 30

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b30 & 70

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c50 & 50

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d90 & 10

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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

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bCold rolling

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cHot rolling

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dCasting

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View Answer Cold rolling

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


a5

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b15

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c30

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d45

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View Answer 15

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