Chemical Engineering Thermodynamics Objective Questions & Answers Pdf - 3

Question: 11

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

(A) ammonia

(B) methyl chloride

(C) liquid sulphur dioxide

(D) freon

Question: 12

After throttling, gas temperature

(A) may increase or decrease; depends on the nature of the gas

(B) increases

(C) decreases

(D) remains same

Question: 13

What happens in a reversible adiabatic compression?

(A) temperature is constant

(B) pressure is constant

(C) heating occurs

(D) cooling occurs

Question: 14

The necessary and sufficient condition for equilibrium between two phases is

(A) the chemical potential of each component should be same in the two phases

(B) the pressure should be same in the two phases

(C) the temperature of each phase should be same

(D) the concentration of each component should be same in the two phases

Question: 15

For a multi component system, chemical potential is equivalent to

(A) partial molar free energy

(B) change in molar free energy due to phase change

(C) molal concentration difference

(D) molar free energy of the pure compounds