Mechanical Engineering Exam > Mechanical Engineering Questions > In a reversible cycle, the entropy of the sys...
Start Learning for Free
In a reversible cycle, the entropy of the system
- a)increases
- b)decreases
- c)does not change
- d)first increases and than decreases
Correct answer is option 'C'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Most Upvoted Answer
In a reversible cycle, the entropy of the systema)increasesb)decreases...
Reversible Cycle and Entropy Change
Reversible cycle refers to a thermodynamic process that can be reversed by an infinitesimal change in a variable, such as temperature or pressure. The concept of reversible cycle is important in thermodynamics because it represents the theoretical limit of efficiency for heat engines and refrigeration cycles.
Entropy, on the other hand, is a measure of the disorder or randomness of a system. It is a state function, which means that its value depends only on the initial and final states of the system, regardless of the path taken between them. The change in entropy of a system is given by the equation:
ΔS = Q rev/T
Where ΔS is the change in entropy, Q rev is the heat transferred in a reversible process, and T is the temperature at which the process occurs.
Based on this equation, we can conclude that:
- If Q rev > 0 (heat is added to the system), ΔS > 0 (entropy increases)
- If Q rev < 0="" (heat="" is="" removed="" from="" the="" system),="" δs="" />< 0="" (entropy="" />
- If Q rev = 0 (adiabatic process), ΔS = 0 (entropy does not change)
Therefore, in a reversible cycle:
- The heat transfer occurs in a reversible process, which means that Q rev is always zero
- The temperature remains constant during the process, which means that T is always constant
- Therefore, ΔS = 0 for a reversible cycle, which means that the entropy of the system does not change.
Reversible cycle refers to a thermodynamic process that can be reversed by an infinitesimal change in a variable, such as temperature or pressure. The concept of reversible cycle is important in thermodynamics because it represents the theoretical limit of efficiency for heat engines and refrigeration cycles.
Entropy, on the other hand, is a measure of the disorder or randomness of a system. It is a state function, which means that its value depends only on the initial and final states of the system, regardless of the path taken between them. The change in entropy of a system is given by the equation:
ΔS = Q rev/T
Where ΔS is the change in entropy, Q rev is the heat transferred in a reversible process, and T is the temperature at which the process occurs.
Based on this equation, we can conclude that:
- If Q rev > 0 (heat is added to the system), ΔS > 0 (entropy increases)
- If Q rev < 0="" (heat="" is="" removed="" from="" the="" system),="" δs="" />< 0="" (entropy="" />
- If Q rev = 0 (adiabatic process), ΔS = 0 (entropy does not change)
Therefore, in a reversible cycle:
- The heat transfer occurs in a reversible process, which means that Q rev is always zero
- The temperature remains constant during the process, which means that T is always constant
- Therefore, ΔS = 0 for a reversible cycle, which means that the entropy of the system does not change.
Attention Mechanical Engineering Students!
To make sure you are not studying endlessly, EduRev has designed Mechanical Engineering study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Mechanical Engineering.
|
Explore Courses for Mechanical Engineering exam
|
|
Similar Mechanical Engineering Doubts
Top Courses for Mechanical EngineeringView all
In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer?
Question Description
In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer?.
In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer?.
Solutions for In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free.
Here you can find the meaning of In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice In a reversible cycle, the entropy of the systema)increasesb)decreasesc)does not changed)first increases and than decreasesCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
|
|
Explore Courses for Mechanical Engineering exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup