Chemical Engineering MCQs

Page No. 107

Presence of high amount of silicon in cast iron________________?


aSuppresses the decomposition of Fe3C


bIncreases the formation of graphite


cIncreases the contraction of the metal


dReduces its fluidity



Cp of a gas at its critical temperature and pressure_______________?


aBecomes zero


bBecomes infinity


cEquals 1 kcal/kmol °K


dEquals 0.24 kcal/kmol °K


View Answer Becomes infinity

The main purpose of galvanising iron sheets is to___________________?


aHarden the surface


bIncrease its glossiness and lustre


cPrevent the action of water


dPrevent the action of oxygen



An ideal liquid refrigerant should______________________?


aNot have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils


bNot have unduly high vapour pressure at the condenser temperature


c Both A. and B


dHave low specific heat


View Answer Both A. and B

The temperature at which new grains are formed in the metal is called the ______________ temperature?


aEutectic


bRecrystallisation


cUpper critical


dLower critical


View Answer Recrystallisation

Pick out the Clausius-Clapeyron equation from the following?


adP/dT = ΔH/TΔV


b ln P = – (ΔH/RT) + constant


c ΔF = ΔH + T [∂(ΔF)/∂T]P


dNone of these



Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ?


aInvar


bConstantan


cChromel


dAlumel


View Answer Invar

Caustic soda can be stored in _____________ drums?


aSteel


bCast iron


cBrass


dGun metal


View Answer Steel

The variation of heat of reaction with temperature at constant pressure is given by the ____________ law?


aKelvin’s


bAntoine’s


cKirchoff’s


dNone of these


View Answer Kirchoff’s

Addition of ______________ to the steel helps in increasing the residual magnetism in steel used for making magnets?


aChromium


bNickel


cTungsten


dCobalt


View Answer Cobalt

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