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Which one of the following statements is not correct for a regenerative steam cycle?
- a)It increases the thermodynamic efficiency
- b)It reduces boiler capacity for a given output
- c)It reduces temperature stresses in the boiler due to hotter feed
- d)The efficiency increases with increased number of feed heaters
Correct answer is option 'C'. Can you explain this answer?
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Which one of the following statements is not correct for a regenerativ...
(c) (i) η ↑ with increased number of feed heaters but Efficiency ain(Δη ) successively diminishes with the increase in the number of heaters
(ii) It increases the stream flow rate (requiring bigger boiler)
(iii) It reduces the steam flow to the condenser (needing smaller condenser)
(iii) It reduces the steam flow to the condenser (needing smaller condenser)
Most Upvoted Answer
Which one of the following statements is not correct for a regenerativ...
Regenerative Steam Cycle
The regenerative steam cycle is a modification of the basic Rankine cycle, which is commonly used in steam power plants. It involves the extraction of steam from various stages of the turbine and using that steam to preheat the feedwater before it enters the boiler. This process increases the overall efficiency of the cycle by reducing the heat input required in the boiler.
Statement: The regenerative steam cycle reduces temperature stresses in the boiler due to hotter feed.
Explanation:
When the feedwater enters the boiler at a higher temperature, it reduces the temperature difference between the feedwater and the steam. This results in lower temperature stresses in the boiler. However, this statement is incorrect. Here's why:
Temperature Stresses in the Boiler:
In a steam boiler, the metal walls are subjected to high temperatures and pressure fluctuations. These conditions can cause thermal stresses on the boiler components, leading to potential failures or reduced lifespan. The temperature difference between the steam and the feedwater is a critical factor in determining these stresses.
Effects of Regenerative Feedwater Heating:
The regenerative feedwater heating in a steam cycle involves extracting steam from different turbine stages and using it to preheat the feedwater. This process increases the temperature of the feedwater before it enters the boiler. While this results in improved cycle efficiency, it also increases the temperature difference between the feedwater and the steam.
Increased Temperature Difference:
By introducing hotter feedwater into the boiler, the temperature difference between the feedwater and the steam actually increases. This can lead to higher temperature stresses in the boiler, as the hot feedwater is in direct contact with the metal walls. The increased temperature difference can cause thermal expansion and contraction of the boiler components, which can result in higher stresses and potential structural issues.
Correct Answer:
Therefore, statement (c) "The regenerative steam cycle reduces temperature stresses in the boiler due to hotter feed" is not correct. The regenerative steam cycle, in fact, increases temperature stresses in the boiler due to the higher temperature difference between the feedwater and the steam.
The regenerative steam cycle is a modification of the basic Rankine cycle, which is commonly used in steam power plants. It involves the extraction of steam from various stages of the turbine and using that steam to preheat the feedwater before it enters the boiler. This process increases the overall efficiency of the cycle by reducing the heat input required in the boiler.
Statement: The regenerative steam cycle reduces temperature stresses in the boiler due to hotter feed.
Explanation:
When the feedwater enters the boiler at a higher temperature, it reduces the temperature difference between the feedwater and the steam. This results in lower temperature stresses in the boiler. However, this statement is incorrect. Here's why:
Temperature Stresses in the Boiler:
In a steam boiler, the metal walls are subjected to high temperatures and pressure fluctuations. These conditions can cause thermal stresses on the boiler components, leading to potential failures or reduced lifespan. The temperature difference between the steam and the feedwater is a critical factor in determining these stresses.
Effects of Regenerative Feedwater Heating:
The regenerative feedwater heating in a steam cycle involves extracting steam from different turbine stages and using it to preheat the feedwater. This process increases the temperature of the feedwater before it enters the boiler. While this results in improved cycle efficiency, it also increases the temperature difference between the feedwater and the steam.
Increased Temperature Difference:
By introducing hotter feedwater into the boiler, the temperature difference between the feedwater and the steam actually increases. This can lead to higher temperature stresses in the boiler, as the hot feedwater is in direct contact with the metal walls. The increased temperature difference can cause thermal expansion and contraction of the boiler components, which can result in higher stresses and potential structural issues.
Correct Answer:
Therefore, statement (c) "The regenerative steam cycle reduces temperature stresses in the boiler due to hotter feed" is not correct. The regenerative steam cycle, in fact, increases temperature stresses in the boiler due to the higher temperature difference between the feedwater and the steam.
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Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect answer is option 'C'. Can you explain this answer?
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Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect 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 Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect 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 Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect answer is option 'C'. Can you explain this answer?.
Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect 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 Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect 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 Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect 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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Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Which one of the following statements is not correct for a regenerative steam cycle?a)It increases the thermodynamic efficiencyb)It reduces boiler capacity for a given outputc)It reduces temperature stresses in the boiler due to hotter feedd)The efficiency increases with increased number of feed heatersCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
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