Chemical Engineering MCQs

Page No. 147

Gibbs free energy (G) is represented by, G = H – TS, whereas Helmholtz free energy, A. is given by, A = E – TS. Which of the following is the Gibbs-Helmholtz equation ?


a[∂(G/T)/∂T] = – (H/T2)


b[∂(A/T)/∂T]V = – E/T2


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

A refrigerator works on the principle of _____________ law of thermodynamics?


aZeroth


bFirst


cSecond


dThird


View Answer Second

At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is__________________?


a1.572


b 1.9398


c3.389


d4.238


View Answer 1.572

Entropy, which is a measure of the disorder of a system, is__________________?


aIndependent of pressure


bIndependent of temperature


cZero at absolute zero temperature for a perfect crystalline substance


dAll A, B. & C



One ton of refrigeration capacity is equivalent to the heat removal rate of____________________?


a50 kcal/hr


b200 BTU/hr


c200 BTU/minute


d200 BTU/day


View Answer 200 BTU/minute

Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system ?


aExpansion valve


bCondenser


cRefrigerator


dCompressor


View Answer Compressor

In any spontaneous process, the ______________ free energy decreases ?


aHelmholtz


bGibbs


c Both A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Lenz’s law results from the law of conservation of___________________?


aMass


bMomentum


cEnergy


dNone of these


View Answer Energy

At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is____________________?


aZero


bOne


cInfinity


dNegative


View Answer One

Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. °K___________________?


a0


b


c50


d100


View Answer

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