Engineering Thermodynamics MCQs | Page - 48

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.

📊 Engineering Thermodynamics
Q. According to Carnot’s theorem, all heat engines operating between a given constant temperature source and sink, none has a higher efficiency than a reversible engine.
  • (A) true
  • (B) false
  • (C) ---
  • (D) ---
💬 Discuss
✅ Correct Answer: (A) true
📊 Engineering Thermodynamics
Q. The efficiency of all reversible heat engines operating between the same heat reservoirs is
  • (A) same
  • (B) independent of the nature of working substance
  • (C) independent of the amount of working substance
  • (D) all of the mentioned
💬 Discuss
✅ Correct Answer: (D) all of the mentioned
📊 Engineering Thermodynamics
Q. According to entropy principle, the entropy of an isolated system can never decrease and remains constant only when the process is reversible.
  • (A) true
  • (B) false
  • (C) ---
  • (D) ---
💬 Discuss
✅ Correct Answer: (A) true
📊 Engineering Thermodynamics
Q. Entropy may decrease locally at some region within the isolated system. How can this statement be justified?
  • (A) this cannot be possible
  • (B) this is possible because entropy of an isolated system can decrease.
  • (C) it must be compensated by a greater increase of entropy somewhere within the system.
  • (D) none of the mentioned
💬 Discuss
✅ Correct Answer: (C) it must be compensated by a greater increase of entropy somewhere within the system.
📊 Engineering Thermodynamics
Q. The part of available for conversion is referred to
  • (A) high grade energy, available energy
  • (B) low grade energy, available energy
  • (C) low grade energy, unavailable energy
  • (D) high grade energy, unavailable energy
💬 Discuss
✅ Correct Answer: (B) low grade energy, available energy
📊 Engineering Thermodynamics
Q. The obtainable from a certain heat input in a cyclic heat engine is called
  • (A) minimum work output, available energy
  • (B) maximum work output, available energy
  • (C) minimum work input, unavailable energy
  • (D) none of the mentioned
💬 Discuss
✅ Correct Answer: (B) maximum work output, available energy
📊 Engineering Thermodynamics
Q. The available energy is known as and the unavailable energy is known as
  • (A) energy, exergy
  • (B) exergy, energy
  • (C) both are called exergy
  • (D) both are called energy
💬 Discuss
✅ Correct Answer: (B) exergy, energy

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