Chemical Engineering Thermodynamics MCQs

Question 1

The unit of fugacity is the same as that of the

Accepted Answer

Pressure

Answer

Temperature

Answer

Volume

Answer

Molar concentration

Question 2

Claussius-Clayperon equation gives accurate result, when the

Accepted Answer

All of the above

Answer

Vapour pressure is relatively low and the temperature does not vary over wide limits

Answer

Vapour obeys the ideal gas law and the latent heat of vaporisation is constant

Answer

Volume in the liquid state is negligible compared with that in the vapour state

Question 3

Joule-Thomson experiment is

Accepted Answer

Both B & C

Answer

Isobaric

Answer

Adiabatic

Answer

Isenthalpic

Question 4

If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the

Accepted Answer

Both B and C

Answer

Process must be isobaric

Answer

Temperature must decrease

Answer

Process must be adiabatic

Question 5

The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.

Accepted Answer

Triple

Answer

Freezing

Answer

Boiling

Answer

Boyle

Question 6

Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor)?

Accepted Answer

Freon

Answer

Liquid sulphur dioxide

Answer

Methyl chloride

Answer

Ammonia

Question 7

Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.

Accepted Answer

327

Answer

270

Answer

300

Answer

540

Question 8

Pick out the wrong statement.

Accepted Answer

None of the above

Answer

A closed system does not permit exchange of mass with its surroundings but may permit exchange of energy

Answer

An open system permits exchange of both mass and energy with its surroundings

Answer

The term microstate is used to characterise an individual, whereas macro-state is used to designate a group of micro-states with common characteristics

Question 9

For an isothermal reversible compression of an ideal gas

Accepted Answer

ΔE = ΔH = 0

Answer

Only ΔE = 0

Answer

Only ΔH =0

Answer

DQ = dE