Chemical Engineering Thermodynamics MCQs

Question 1

Which of the following liquid metals has the highest thermal conductivity?

Accepted Answer

Molten sodium

Answer

Molten lead

Answer

Mercury

Answer

Molten potassium

Question 2

A gas shows deviation from ideal behaviour at

Accepted Answer

Low temperature and high pressure

Answer

Low pressure and high temperature

Answer

Low pressure and low temperature

Answer

High temperature and high pressure

Question 3

Fugacity and pressure are numerically not equal for the gases

Accepted Answer

Both A and B

Answer

At low temperature and high pressure

Answer

At standard state

Answer

In ideal state

Question 4

__________ equation predicts the activity co-efficient from experimental data.

Accepted Answer

Both B & C

Answer

Lewis-Randall

Answer

Margules

Answer

Van Laar

Question 5

Pick out the correct statement.

Accepted Answer

The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

Answer

If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase

Answer

A process is irreversible as long as Δ S for the system is greater than zero

Answer

The mechanical work done by a system is always equal to ∫P.dV

Question 6

Entropy change of mixing two liquid substances depends upon the

Accepted Answer

Both A and B

Answer

Molar concentration

Answer

Quantity (i.e. number of moles)

Answer

Neither A nor B

Question 7

Pick out the wrong statement.

Accepted Answer

The accentric factor for all materials is always more than one

Answer

Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point

Answer

Entropy of a system decreases with the evolution of heat

Answer

Change of internal energy is negative for exothermic reactions

Question 8

Ideal gas law is applicable at

Accepted Answer

High T, low P

Answer

Low T, low P

Answer

High T, high P

Answer

Low T, high P

Question 9

Ideal refrigeration cycle is

Accepted Answer

Same as reverse Carnot cycle

Answer

Same as Carnot cycle

Answer

Dependent on the refrigerant's properties

Answer

The least efficient of all refrigeration processes