Chemical Engineering MCQs

Page No. 411

At standard conditions, N2 + 2O2 ⇌ 2NO2; ΔG° = 100 kJ/mole NO + ½O2 ⇌ 2NO2; ΔG° = -35 kJ/mole The standard free energy of formation of NO in kJ/mole is___________________?


a15


b30


c85


d170


View Answer 85

Validity of the relationship, inputs = outputs, holds good for the system at steady state________________?


aWith chemical reaction


bWithout chemical reaction


cWithout chemical reaction & losses


dNone of these



Kopp’s rule is concerned with the calculation of__________________?


aThermal conductivity


bHeat capacity


cViscosity


dSurface tension


View Answer Heat capacity

Viscosity of atmospheric air may be about _____________ centipoise?


a0.015


b1.5


c15


d150


View Answer 0.015

Pick out the wrong unit conversion of heat transfer co-efficient?


a1 kcal/m2.hr.°C = 0.2048 BTU/ft2.hr. °F. = 1.163 W/m2.°K


b1 kcal/m2.hr.°K = 1.163 W/m2.°C


c1 W/m2.°C = 0.1761 BTU/ft2.hr.°F.


d1 BTU/ft2.hr.°F = 4.88 kcal/m2.hr.°C = 20.44 kJ/m2.hr°C = 5.678 W/m2.°C



The rate of material _____________ is zero in case of a steady state system?


aAccumulation


bProduction


cInput


dGeneration


View Answer Accumulation

Refluxing of part of the distillate in a fractionating column is a ‘recycling operation’, aimed primarily at_______________?


aHeat conservation


bYield enhancement


cProduct enrichment


dNone of these


View Answer Product enrichment

If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will _______________?


aRemain unaltered


bIncrease nine fold


cIncrease three fold


dDecrease three fold


View Answer Increase nine fold

Simultaneous doubling of the absolute temperature of a gas and reduction of its pressure to half will result in _____________ in the volume of the gas?


aNo change


bDoubling


c1/4th reduction


dFourfold increase


View Answer Doubling

The unit of Cp in S.I. units is___________________?


aW/m2.°K


bJ/kg.°K


cW/m.°K


dJ/m3. °K


View Answer J/kg.°K

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