Engineering Thermodynamics MCQs | Page - 5

Dear candidates you will find MCQ questions of Engineering Thermodynamics here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

Q. A heat engine using lake water at 12° C as source & the surrounding atmosphere at 2°C as sink executes 1080 cycles per min. If the amount of heat drawn per cycle is 57J, then the output of the engine will be

  • (A) 66 w
  • (B) 56 w
  • (C) 46 w
  • (D) 36 w
💬 Discuss
✅ Correct Answer: (D) 36 w

Published by Mr. Dubey ⭐ 104.85K Points at 14-Jun-2020 11:59 am in Engineering Thermodynamics

Q. One reversible heat engine operates between 1600 K & T₂ K & another reversible heat engine operates between T₂ K & 400 K. If both the engines have the temperature T₂ must be equal to

  • (A) 100 kj
  • (B) 1200 k
  • (C) 1400 k
  • (D) 800 k
💬 Discuss
✅ Correct Answer: (D) 800 k

Published by Mr. Dubey ⭐ 104.85K Points at 14-Jun-2020 11:59 am in Engineering Thermodynamics

Q. An engine receives 15152 J/s of heat & produces 5 KW of power. The efficiency of the engine is

  • (A) 25%
  • (B) 27.5%
  • (C) 30%
  • (D) 33%
💬 Discuss
✅ Correct Answer: (A) 25%

Published by Mr. Dubey ⭐ 104.85K Points at 14-Jun-2020 11:59 am in Engineering Thermodynamics

Q. Choose the correct statement

  • (A) pressure, temp. & entropy are extensiveproperties
  • (B) pressure, temp. & entropy are intensiveproperties
  • (C) pressure, volume & temp. are extensive properties
  • (D) volume & entropy are extensive properties
💬 Discuss
✅ Correct Answer: (D) volume & entropy are extensive properties

Published by Mr. Dubey ⭐ 104.85K Points at 14-Jun-2020 11:59 am in Engineering Thermodynamics

Q. The second law of thermodynamics defines

  • (A) heat
  • (B) enthalpy
  • (C) internal energy
  • (D) entropy
💬 Discuss
✅ Correct Answer: (D) entropy

Published by Mr. Dubey ⭐ 104.85K Points at 14-Jun-2020 11:59 am in Engineering Thermodynamics

Q. Which law of thermodynamics defines entropy

  • (A) first
  • (B) second
  • (C) third
  • (D) zeroeth
💬 Discuss
✅ Correct Answer: (B) second

Published by Mr. Dubey ⭐ 104.85K Points at 14-Jun-2020 11:59 am in Engineering Thermodynamics

Q. Which of the following processes is essentially irreversible

  • (A) isothermal
  • (B) adiabatic
  • (C) isentropic
  • (D) thrittling
💬 Discuss
✅ Correct Answer: (D) thrittling

Published by Mr. Dubey ⭐ 104.85K Points at 14-Jun-2020 11:59 am in Engineering Thermodynamics

Q. A thermodynamic cycle operates between 400 K. & 290 K. 500 MJ/s of heat is added to the working substance. The power generated is

  • (A) 290 mw
  • (B) 290 mj
  • (C) 137.5 mw
  • (D) 137.5 mj
💬 Discuss
✅ Correct Answer: (D) 137.5 mj

Published by Mr. Dubey ⭐ 104.85K Points at 14-Jun-2020 11:59 am in Engineering Thermodynamics

Q. A reversible engine performing as engine has efficiency of 62.5%. If it is reversed to work as refrigerator its COP will be

  • (A) 60%
  • (B) 62.5%
  • (C) 65%
  • (D) 37.5%
💬 Discuss
✅ Correct Answer: (C) 65%

Published by Mr. Dubey ⭐ 104.85K Points at 14-Jun-2020 11:59 am in Engineering Thermodynamics

Q. A reversible engine performing as refrigerator has COP=33%. If the same machine operates as engine, its efficiency will be

  • (A) 67%
  • (B) 33%
  • (C) 75%
  • (D) 37.5%
💬 Discuss
✅ Correct Answer: (A) 67%

Published by Mr. Dubey ⭐ 104.85K Points at 14-Jun-2020 11:59 am in Engineering Thermodynamics

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