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

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View Answer 85

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


aWith chemical reaction

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bWithout chemical reaction

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cWithout chemical reaction & losses

✓


dNone of these

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Kopp’s rule is concerned with the calculation of__________________?


aThermal conductivity

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bHeat capacity

✓


cViscosity

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dSurface tension

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View Answer Heat capacity

Viscosity of atmospheric air may be about _____________ centipoise?


a0.015

✓


b1.5

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c15

✖


d150

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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

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


aAccumulation

✓


bProduction

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cInput

✖


dGeneration

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View Answer Accumulation

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


aHeat conservation

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bYield enhancement

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cProduct enrichment

✓


dNone of these

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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

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bIncrease nine fold

✓


cIncrease three fold

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dDecrease three fold

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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

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bDoubling

✓


c1/4th reduction

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dFourfold increase

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View Answer Doubling

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


aW/m2.°K

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bJ/kg.°K

✓


cW/m.°K

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dJ/m3. °K

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View Answer J/kg.°K

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