Chemical Engineering Thermodynamics MCQs

Question 1

If atmospheric temperature and dew point are nearly equal, then the relative humidity is

Accepted Answer

Almost 100%

Answer

Zero

Answer

50%

Answer

Unpredictable

Question 2

First law of thermodynamics deals with the

Accepted Answer

None of these

Answer

Direction of energy transfer

Answer

Reversible processes only

Answer

Irreversible processes only

Question 3

In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is

Accepted Answer

Same

Answer

More

Answer

Less

Answer

Unpredictable; depends on the particular reaction

Question 4

COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about

Accepted Answer

3.5

Answer

0.5

Answer

4.5

Answer

8.5

Question 5

The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is

Accepted Answer

1

Answer

3

Answer

2

Answer

0

Question 6

Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.

Accepted Answer

Minus infinity

Answer

Infinity

Answer

Zero

Answer

None of these

Question 7

Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)?

Accepted Answer

Air cycle

Answer

Carnot cycle

Answer

Ordinary vapour compression cycle

Answer

Vapour compression with a reversible expansion engine

Question 8

At absolute zero temperature, all substances have the same

Accepted Answer

Heat capacity

Answer

Crystalline structure

Answer

Entropy

Answer

None of these

Question 9

The expression, $$\Delta {	ext{G}} = {	ext{nRT}}.l{	ext{n}}\frac{{{{	ext{P}}_2}}}{{{{	ext{P}}_1}}},$$ gives the free energy change

Accepted Answer

With pressure changes at constant temperature

Answer

Under reversible isothermal volume change

Answer

During heating of an ideal gas

Answer

During cooling of an ideal gas