Mechanical Engineering Exam > Mechanical Engineering Questions > Once- through boilers operate ata)subcritical...
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Once- through boilers operate at
- a)subcritical pressure
- b)supercritical pressure
- c)subcritical as well supercritical pressures
- d)critical pressure only
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Once- through boilers operate ata)subcritical pressureb)supercritical ...
Explanation:
Once-through Boilers:
Once-through boilers operate at both subcritical and supercritical pressures. These boilers do not have a steam drum like traditional boilers, and water is heated as it flows through the tubes.
Subcritical Pressure:
- At subcritical pressures, water enters the boiler and is heated to its boiling point, producing steam.
- The water-steam mixture then flows through the tubes and is separated into water and steam in the steam drum.
Supercritical Pressure:
- At supercritical pressures, water is heated above its critical point, where there is no distinction between liquid and gas phase.
- The water-steam mixture flows through the tubes without the need for a steam drum, as there is no phase change occurring.
Advantages of Operating at Both Pressures:
- Operating at subcritical pressure allows for better control over the steam generation process.
- Operating at supercritical pressure increases efficiency by eliminating the need for a steam drum and reducing energy losses.
Conclusion:
Once-through boilers are capable of operating at both subcritical and supercritical pressures, providing flexibility and efficiency in steam generation processes.
Once-through Boilers:
Once-through boilers operate at both subcritical and supercritical pressures. These boilers do not have a steam drum like traditional boilers, and water is heated as it flows through the tubes.
Subcritical Pressure:
- At subcritical pressures, water enters the boiler and is heated to its boiling point, producing steam.
- The water-steam mixture then flows through the tubes and is separated into water and steam in the steam drum.
Supercritical Pressure:
- At supercritical pressures, water is heated above its critical point, where there is no distinction between liquid and gas phase.
- The water-steam mixture flows through the tubes without the need for a steam drum, as there is no phase change occurring.
Advantages of Operating at Both Pressures:
- Operating at subcritical pressure allows for better control over the steam generation process.
- Operating at supercritical pressure increases efficiency by eliminating the need for a steam drum and reducing energy losses.
Conclusion:
Once-through boilers are capable of operating at both subcritical and supercritical pressures, providing flexibility and efficiency in steam generation processes.
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Once- through boilers operate ata)subcritical pressureb)supercritical pressurec)subcritical as well supercritical pressuresd)critical pressure onlyCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Once- through boilers operate ata)subcritical pressureb)supercritical pressurec)subcritical as well supercritical pressuresd)critical pressure onlyCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Once- through boilers operate ata)subcritical pressureb)supercritical pressurec)subcritical as well supercritical pressuresd)critical pressure onlyCorrect answer is option 'C'. Can you explain this answer?.
Once- through boilers operate ata)subcritical pressureb)supercritical pressurec)subcritical as well supercritical pressuresd)critical pressure onlyCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Once- through boilers operate ata)subcritical pressureb)supercritical pressurec)subcritical as well supercritical pressuresd)critical pressure onlyCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Once- through boilers operate ata)subcritical pressureb)supercritical pressurec)subcritical as well supercritical pressuresd)critical pressure onlyCorrect answer is option 'C'. Can you explain this answer?.
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