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thermodynamics MCQs

Practise focused thermodynamics questions with marked answers for exam preparation and subject revision.

thermodynamics Mcqs

1. Solids and liquids have___________________?
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A. one value under some conditions and two values under other conditions

B. one value of specific heat (ft) two values of specific heat

C. three values of specific heat

D. no value of specific heat

2. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant_______________?
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A. temperature

B. volume

C. internal energy

D. entropy

E. pressure

3. Brayton cycle consists of following four processes____________________?
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A. two isentropics and two constant volumes

B. two isentropics and two constant pres-sures

C. two isentropics, one constant volume and one constant pressure

D. none of the above

E. two isothermals and two isentropics

4. Which of the following cycles is not a reversible cycle_____________________?
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A. Stirling

B. none of the above

C. Joule

D. Carnot

E. Ericsson

5. Intensive property of a system is one whose value____________________?
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A. depends on the mass of the system, like volume

B. does not depend on the mass of the system, like temperature, pressure, etc

C. remains constant

D. is dependent on the path followed and not on the state

E. is not dependent on the path followed but on the state

6. The efficiency of Diesei cycle with decrease in cut off_________________?
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A. remains unaffected

B. first decreases and then increases

C. first increases and then decreases

D. increases

E. decreases

7. If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle___________________?
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A. none of the above

B. more

C. equal

D. less

E. depends on other factors

8. According to Clausis statement of second law of thermodynamics___________________?
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A. all of the above

B. heat cant be transferred from low temperature source to high temperature source

C. heat can be transferred for low temperature to high temperature source by using refrigeration cycle.

D. heat cant be transferred from low temperature to high temperature source without the aid of external energy

E. heat can be transferred from low temperature to high temperature source if COP of process is more than unity

9. The ideal efficiency of a Brayton cycle without regeneration with increase ni pressure ratio will_________________?
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A. decrease

B. increase

C. remain unchanged

D. increase/decrease depending on application

E. unpredictable

10. For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be___________________?
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A. minimum

B. maximum

C. zero

D. infinity

E. there is no such criterion

11. Water contained in a beaker can be made to boil by passing steam through it__________________?
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A. any pressure

B. at atmospheric pressure

C. not possible

D. at a pressure greater than atmospheric pressure

E. at a pressure below the firuosphejric pressure

12. Barometric pressure is equal to_____________________?
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A. 1 mm Hg

B. 760 mm Hg

C. 735.6 mm Hg

D. zero mm Hg

E. 100mm Hg

13. In a free expansion process___________________?
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A. work done is zero

B. heat transfer is zero

C. both A. and B. above

D. work done is zero but heat increases

E. work done is zero but heat decreases

14. The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as_________________?
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A. Diesel cycle

B. Rankine cycle

C. Atkinson cycle

D. Stirling cycle

E. Dual combustion cycle

15. First law of thermodynamics___________________?
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A. provides relationship between heat, work and internal energy

B. enables to determine change in internal energy of the system

C. does not help to predict whether the system will or not undergo a change

D. all of the above

E. does not enable to determine change in entropy

16. Energy can neither be created nor destroyed but can be converted from one form to other is inferred from_________________?
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A. basic law of thermodynamics

B. second law to thermodynamics

C. claussius statement

D. zeroth low of thermodynamic

E. first law of thermodynamics

17. Which law states that the specific heat of a gas remains constant at all temperatures and pressures______________________?
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A. there is no such law

B. Joules Law

C. Regnaults Law

D. Boyles Law

E. Charles Law

18. A perpetual motion machine is___________________?
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A. a non-thermodynamic machine

B. a hypothetical machine whose opera-tion would violate the laws of thermodynamics

C. a thermodynamic machine

D. an inefficient machine

E. a hypothetical machine

19. Which of the following laws is applicable for the behavior of a perfect gas__________________?
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A. Joules law

B. Gay-Lussac law

C. all of the above

D. Charleslaw

E. Boyles law

20. In order that a cycle be reversible, following must be satisfied ________________?
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A. when heat is being absorbed, temperature of hot source and working substance should be same

B. when beat is being rejected, temperature of cold source and working sub-stance should be same

C. none of the above

D. free expansion or friction resisted expansion/compression process should not be encountered

E. all of the above

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