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What changes occur in pressure and velocity when steam flows through the second row of moving blades of a velocity compounded impulse turbine?
- a)velocity decreases and pressure remains constant
- b)pressure decreases and velocity remains constant
- c)both velocity and pressure remains constant
- d)both velocity and pressure decrease
Correct answer is option 'A'. Can you explain this answer?
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Changes in Pressure and Velocity in the Second Row of Moving Blades of a Velocity Compounded Impulse Turbine
In a velocity compounded impulse turbine, the steam flows through a series of rows of moving blades, each row of blades being followed by a row of fixed blades. The purpose of these blades is to extract energy from the steam and convert it into mechanical work.
Explanation:
1. Initial Stage:
- In the initial stage, the steam enters the turbine at a high pressure and velocity.
- The first row of moving blades extracts a portion of the kinetic energy from the steam, resulting in a decrease in velocity.
- As the steam passes through the first row of moving blades, its velocity decreases while the pressure remains fairly constant.
2. Second Row of Moving Blades:
- After passing through the first row of moving blades, the steam enters the second row of moving blades.
- In this row, the steam has already lost some of its kinetic energy and is at a lower velocity compared to its initial state.
- The second row of moving blades further extracts a portion of the remaining kinetic energy from the steam, causing a further decrease in velocity.
- Since the pressure of the steam remains fairly constant throughout this process, the pressure does not change significantly in the second row of moving blades.
3. Overall Effect:
- As the steam flows through each subsequent row of moving blades, the velocity continues to decrease while the pressure remains constant.
- This decrease in velocity is due to the extraction of kinetic energy by the moving blades, which is converted into mechanical work.
- The pressure drop in the turbine occurs mainly in the fixed blades, which act as nozzles to accelerate the steam and convert its pressure energy into kinetic energy.
Conclusion:
In a velocity compounded impulse turbine, the steam experiences a decrease in velocity as it flows through the second row of moving blades. However, the pressure remains fairly constant throughout this process. Therefore, option 'A' is the correct answer.
In a velocity compounded impulse turbine, the steam flows through a series of rows of moving blades, each row of blades being followed by a row of fixed blades. The purpose of these blades is to extract energy from the steam and convert it into mechanical work.
Explanation:
1. Initial Stage:
- In the initial stage, the steam enters the turbine at a high pressure and velocity.
- The first row of moving blades extracts a portion of the kinetic energy from the steam, resulting in a decrease in velocity.
- As the steam passes through the first row of moving blades, its velocity decreases while the pressure remains fairly constant.
2. Second Row of Moving Blades:
- After passing through the first row of moving blades, the steam enters the second row of moving blades.
- In this row, the steam has already lost some of its kinetic energy and is at a lower velocity compared to its initial state.
- The second row of moving blades further extracts a portion of the remaining kinetic energy from the steam, causing a further decrease in velocity.
- Since the pressure of the steam remains fairly constant throughout this process, the pressure does not change significantly in the second row of moving blades.
3. Overall Effect:
- As the steam flows through each subsequent row of moving blades, the velocity continues to decrease while the pressure remains constant.
- This decrease in velocity is due to the extraction of kinetic energy by the moving blades, which is converted into mechanical work.
- The pressure drop in the turbine occurs mainly in the fixed blades, which act as nozzles to accelerate the steam and convert its pressure energy into kinetic energy.
Conclusion:
In a velocity compounded impulse turbine, the steam experiences a decrease in velocity as it flows through the second row of moving blades. However, the pressure remains fairly constant throughout this process. Therefore, option 'A' is the correct answer.
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What changes occur in pressure and velocity when steam flows through the second row of moving blades of a velocity compounded impulse turbine?a)velocity decreases and pressure remains constantb)pressure decreases and velocity remains constantc)both velocity and pressure remains constantd)both velocity and pressure decreaseCorrect answer is option 'A'. Can you explain this answer?
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What changes occur in pressure and velocity when steam flows through the second row of moving blades of a velocity compounded impulse turbine?a)velocity decreases and pressure remains constantb)pressure decreases and velocity remains constantc)both velocity and pressure remains constantd)both velocity and pressure decreaseCorrect answer is option 'A'. 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 What changes occur in pressure and velocity when steam flows through the second row of moving blades of a velocity compounded impulse turbine?a)velocity decreases and pressure remains constantb)pressure decreases and velocity remains constantc)both velocity and pressure remains constantd)both velocity and pressure decreaseCorrect answer is option 'A'. 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 What changes occur in pressure and velocity when steam flows through the second row of moving blades of a velocity compounded impulse turbine?a)velocity decreases and pressure remains constantb)pressure decreases and velocity remains constantc)both velocity and pressure remains constantd)both velocity and pressure decreaseCorrect answer is option 'A'. Can you explain this answer?.
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