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Chemical Engineering Thermodynamics Online Exam Quiz

Important questions about Chemical Engineering Thermodynamics. Chemical Engineering Thermodynamics MCQ questions with answers. Chemical Engineering Thermodynamics exam questions and answers for students and interviews.

1. Degress of freedom at triple point will be


A : 0

B : 1

C : 2

D : 3

2. Joule-Thomson experiment is


A : isobaric

B : adiabatic

C : isenthalpic

D : both(b) & (c)

3. A refrigerator may be termed as a


A : heat pump

B : heat engine

C : Carnot engine

D : none of these

4. "Law of corresponding states" says that


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

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

C : no gas can be liquified above the critical temperature, howsoever high the pressure may be.

D : the molar heat of energy of gas at constant volume should be nearly constant (about 3 calories).

5. Pick out the correct statement.


A : Compression ratio of an Otto engine is comparatively higher than a diesel engine.

B : Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio.

C : Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work produced per quantity of heat.

D : Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work.

6. In any spontaneous process,


A : only F decreases

B : only A decreases

C : both F and A decreases

D : both F and A increase

7. Entropy of an ideal gas depends upon its


A : pressure

B : temperature

C : both (a) & (b)

D : neither (a) nor (b)

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


A : Air cycle

B : Carnot cycle

C : Ordinary vapour compression cycle

D : Vapour compression with a reversible expansion engine

9. 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.


A : 270

B : 327

C : 300

D : 540

10. Internal energy change of a system over one complete cycle in a cyclic process is


A : zero

B : +ve

C : -ve

D : dependent on the path

1. High __________ is an undesirable property for a good refrigerant.


A : specific heat

B : latent heat of vaporisation

C : viscosity

D : specific vapor volume

2. All gases during throttling process at atmospheric temperature and pressure show a cooling effect except


A : CO 2

B : H 2

C : O 2

D : N 2

3. The expression, , gives the free energy change


A : with pressure changes at constant temperature.

B : under reversible isothermal volume change.

C : during heating of an ideal gas.

D : during cooling of an ideal gas.

4. The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.


A : kinematic viscosity

B : work

C : temperature

D : none of these

5. In jet refrigerators, the refrigerating fluid is practically always


A : water

B : ammonia

C : freon

D : brine

6. For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.


A : decreases

B : increases

C : remains same

D : decreases linearly

7. Van Laar equation deals with the activity co-efficients in


A : binary solutions

B : ternary solutions

C : azeotropic mixture only

D : none of these

8. Which of the following is not an intensive property?


A : Chemical potential

B : Surface tension

C : Heat capacity

D : None of these

9. "At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero". This follows from the


A : third law of thermodynamics

B : second law of thermodynamics

C : Nernst heat theorem

D : Maxwell's relations

10. Boyle's law for gases states that


A : , when temperature is constant.

B : , when temperature & mass of the gas remain constant.

C : P ? V, at constant temperature & mass of the gas.

D : = constant, for any gas.

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