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Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limits
Reason (R): The refrigerating machine requires more energy for working where as a heat pump requires less.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Assertion (A): The coefficient of performance of a heat pump is greate...
R is false. For refrigerating machine our aim is to extract heat from lower temperature source. In heat pump we are interested on heat addition to higher temperature side so it is heat extracted + work added. That so why it’s COP is higher but work requirement is same for both the machine.
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Assertion (A): The coefficient of performance of a heat pump is greate...
Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limits.
Reason (R): The refrigerating machine requires more energy for working whereas a heat pump requires less.
Explanation:
A heat pump and a refrigerating machine are both thermodynamic systems that transfer heat from a low-temperature reservoir to a high-temperature reservoir. However, their objectives are different.
Heat Pump:
- A heat pump is designed to provide heating by extracting heat from a low-temperature source (e.g., ambient air, underground, etc.) and delivering it to a high-temperature sink (e.g., a building).
- The coefficient of performance (COP) of a heat pump is defined as the ratio of the desired heating or cooling effect to the required input energy.
- The COP of a heat pump is always greater than 1 because it can transfer more heat from the low-temperature source to the high-temperature sink.
- The heat pump achieves this by utilizing a small amount of input energy to drive the thermodynamic cycle, such as a vapor compression cycle.
Refrigerating Machine:
- A refrigerating machine is designed to provide cooling by extracting heat from a low-temperature sink (e.g., a refrigerator) and rejecting it to a high-temperature environment (e.g., ambient air).
- The COP of a refrigerating machine is defined as the ratio of the desired cooling effect to the required input energy.
- The COP of a refrigerating machine is always less than 1 because it requires more energy to remove heat from the low-temperature sink to the high-temperature environment.
- The refrigerating machine needs to overcome the natural heat flow from a colder region to a hotter region, which requires additional work input.
Conclusion:
Based on the above explanation, we can conclude that Assertion (A) is true. The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limits. However, Reason (R) is false. The reason provided does not correctly explain the assertion.
Reason (R): The refrigerating machine requires more energy for working whereas a heat pump requires less.
Explanation:
A heat pump and a refrigerating machine are both thermodynamic systems that transfer heat from a low-temperature reservoir to a high-temperature reservoir. However, their objectives are different.
Heat Pump:
- A heat pump is designed to provide heating by extracting heat from a low-temperature source (e.g., ambient air, underground, etc.) and delivering it to a high-temperature sink (e.g., a building).
- The coefficient of performance (COP) of a heat pump is defined as the ratio of the desired heating or cooling effect to the required input energy.
- The COP of a heat pump is always greater than 1 because it can transfer more heat from the low-temperature source to the high-temperature sink.
- The heat pump achieves this by utilizing a small amount of input energy to drive the thermodynamic cycle, such as a vapor compression cycle.
Refrigerating Machine:
- A refrigerating machine is designed to provide cooling by extracting heat from a low-temperature sink (e.g., a refrigerator) and rejecting it to a high-temperature environment (e.g., ambient air).
- The COP of a refrigerating machine is defined as the ratio of the desired cooling effect to the required input energy.
- The COP of a refrigerating machine is always less than 1 because it requires more energy to remove heat from the low-temperature sink to the high-temperature environment.
- The refrigerating machine needs to overcome the natural heat flow from a colder region to a hotter region, which requires additional work input.
Conclusion:
Based on the above explanation, we can conclude that Assertion (A) is true. The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limits. However, Reason (R) is false. The reason provided does not correctly explain the assertion.
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Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limitsReason (R): The refrigerating machine requires more energy for working where as a heat pump requires less.a)Both A and R are individually true and R is the correct explanation of A b)Both A and R are individually true but R is not the correct explanation of A c)A is true but R is false d)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?
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Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limitsReason (R): The refrigerating machine requires more energy for working where as a heat pump requires less.a)Both A and R are individually true and R is the correct explanation of A b)Both A and R are individually true but R is not the correct explanation of A c)A is true but R is false d)A is false but R is trueCorrect 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 Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limitsReason (R): The refrigerating machine requires more energy for working where as a heat pump requires less.a)Both A and R are individually true and R is the correct explanation of A b)Both A and R are individually true but R is not the correct explanation of A c)A is true but R is false d)A is false but R is trueCorrect 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 Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limitsReason (R): The refrigerating machine requires more energy for working where as a heat pump requires less.a)Both A and R are individually true and R is the correct explanation of A b)Both A and R are individually true but R is not the correct explanation of A c)A is true but R is false d)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?.
Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limitsReason (R): The refrigerating machine requires more energy for working where as a heat pump requires less.a)Both A and R are individually true and R is the correct explanation of A b)Both A and R are individually true but R is not the correct explanation of A c)A is true but R is false d)A is false but R is trueCorrect 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 Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limitsReason (R): The refrigerating machine requires more energy for working where as a heat pump requires less.a)Both A and R are individually true and R is the correct explanation of A b)Both A and R are individually true but R is not the correct explanation of A c)A is true but R is false d)A is false but R is trueCorrect 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 Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limitsReason (R): The refrigerating machine requires more energy for working where as a heat pump requires less.a)Both A and R are individually true and R is the correct explanation of A b)Both A and R are individually true but R is not the correct explanation of A c)A is true but R is false d)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limitsReason (R): The refrigerating machine requires more energy for working where as a heat pump requires less.a)Both A and R are individually true and R is the correct explanation of A b)Both A and R are individually true but R is not the correct explanation of A c)A is true but R is false d)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
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ample number of questions to practice Assertion (A): The coefficient of performance of a heat pump is greater than that for the refrigerating machine operating between the same temperature limitsReason (R): The refrigerating machine requires more energy for working where as a heat pump requires less.a)Both A and R are individually true and R is the correct explanation of A b)Both A and R are individually true but R is not the correct explanation of A c)A is true but R is false d)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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