Chemical Engineering MCQs

Page No. 779

The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?


a130


b180


c230


d250


View Answer 230

Lead is poured into the joint between two ______________ pipes?


aMild steel


bConcrete


cCast iron


dAsbestos cement


View Answer Cast iron

The emf of a Deniell cell “Zn | Zn2+ || Cu2+ | Cu” can be increased by_________________?


aDecreasing the surface area of the electrodes


bIncreasing the concentration of zinc sulphate solution


cIncreasing the surface area of the electrodes


dIncreasing the concentration of copper sulphate solution



Which of the following materials does not form adherent oxide film on surface ?


aCopper


bNickel


cAluminium


dGold & silver


View Answer Gold & silver

In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be_______________?


aΔQ = 0, ΔS=0


bΔQ = 0, ΔS = +ve


cΔQ = 0, ΔS = -ve


dΔQ = +ve, ΔS= +ve


View Answer ΔQ = 0, ΔS = +ve

The most suitable material for die casting is __________________?


aIron


bCopper


cSteel


dNickel


View Answer Copper

The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ?


a2300 J


b4600 J


c230 J


d2.3 × 106 J


View Answer 2300 J

______________ wire is never used for making the heating element ?


aNichrome


bKanthal


cInvar


dNone of these


View Answer Invar

The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for ______________ at room temperature ?


aAir


bWater


cMercury


dAlcohol


View Answer Water

Which of the following is resistant to the action of both heat & chemicals ?


aBorosilicate glass


bSilica glass


cSoda lime glass


dNone of these


View Answer Borosilicate glass

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