Chemical Engineering Thermodynamics MCQs

Question 1

Boiling of liquid is accompanied with increase in the

Accepted Answer

Vapor pressure

Answer

Specific Gibbs free energy

Answer

Specific entropy

Answer

All of the above

Question 2

Law of corresponding states says that

Accepted Answer

Two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same

Answer

The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature

Answer

No gas can be liquified above the critical temperature, howsoever high the pressure may be

Answer

The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)

Question 3

Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ____with the increase of reduced temperature.

Accepted Answer

Increases

Answer

Decreases

Answer

Remains constant

Answer

Decreases logarithmically

Question 4

Any substance above its critical temperature exists as

Accepted Answer

Gas

Answer

Saturated vapour

Answer

Solid

Answer

Liquid

Question 5

First law of thermodynamics is mathematically stated as

Accepted Answer

dQ = dE + dW

Answer

dQ = dE - dW

Answer

dE = dQ + dW

Answer

dW = dQ + dE

Question 6

A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is

Accepted Answer

349

Answer

651

Answer

667

Answer

1000

Question 7

Cv for an ideal gas

Accepted Answer

Is independent of both pressure and volume

Answer

Does not depend upon temperature

Answer

Is independent of pressure only

Answer

Is independent of volume only

Question 8

$${	ext{P}}{{	ext{V}}^\gamma }$$ = Constant (where, $$\gamma = \frac{{{{	ext{C}}_{	ext{p}}}}}{{{{	ext{C}}_{	ext{v}}}}}$$ ) is valid for a/an __________ process.

Accepted Answer

Adiabatic

Answer

Isothermal

Answer

Isentropic

Answer

Isobaric

Question 9

In the reaction, represented by, 2SO2 + O2 ⇋ 2SO3; ΔH = -42 kcal; the forward reaction will be favoured by

Accepted Answer

Both A and B

Answer

Low temperature

Answer

High pressure

Answer

Neither A nor B