Chemical Engineering Thermodynamics - Chemical Engineering Questions and Answers

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Partial molar free energy of an element A in solution is same as its

chemical potential

activity

fugacity

activity co-efficient

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Free energy change at equilibrium is

zero

positive

negative

indeterminate

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Heat pump

accomplishes only space heating in winter.

accomplishes only space cooling in summer.

accomplishes both (a) and (b).

works on Carnot cycle.

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The temperature at which both liquid and gas phases are identical, is called the __________ point.

critical

triple

freezing

boiling

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What is the value of ln y (where y = activity co-efficient) for ideal gases ?

Zero

Unity

Infinity

Negative

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A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system

its internal energy (U) decreases and its entropy (S) increases.

U and S both decreases

U decreases but S is constant.

U is constant but S decreases.

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Which is not a refrigerant ?

SO₂

NH₃

CCl₂F₂

C₂H₄Cl₂

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The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

less than

equal to

more than

either (b) or (c); depends on the type of alloy

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Heat is added at constant pressure in an ideal __________ cycle.

Stirling

Brayton

Rankine

both (b) and (c)