Mechanical Engineering Exam > Mechanical Engineering Questions > The main function of the draft tube in a hydr...
Start Learning for Free
The main function of the draft tube in a hydraulic reaction turbine is to
- a)Reduce the effective head across the turbine
- b)Increase the discharge and hence the work
- c)Decrease the discharge to prevent flow separation
- d)Increase the effective head across the turbine
Correct answer is option 'D'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
The main function of the draft tube in a hydraulic reaction turbine is...
The draft tube is a conduit which connects the runner exit to the tail race where the water is being finally discharged from the turbine. The primary function of the draft tube is to convert kinetic head into pressure head there by increasing effctive head and efficiency.
Most Upvoted Answer
The main function of the draft tube in a hydraulic reaction turbine is...
The main function of the draft tube in a hydraulic reaction turbine is to increase the effective head across the turbine.
A draft tube is an essential component of a hydraulic reaction turbine. It is a conical or diverging section of the turbine that is situated immediately after the runner (the rotating part). The primary purpose of the draft tube is to improve the performance and efficiency of the turbine.
The draft tube helps in increasing the effective head across the turbine. The effective head refers to the energy available at the inlet of the turbine. It is the difference between the head at the inlet and the head at the outlet of the turbine.
When the water passes through the runner of the turbine, it gains kinetic energy due to the high velocity of the water. This kinetic energy needs to be converted into pressure energy to generate useful work. The draft tube plays a crucial role in this conversion process.
As the water flows through the runner, its velocity increases. This acceleration causes a drop in the pressure head. However, the draft tube allows the water to expand gradually, reducing the velocity and converting the kinetic energy back into pressure energy.
The draft tube acts as a diffuser, gradually increasing the cross-sectional area of the flow path. This expansion helps in recovering the pressure head lost in the runner. As the velocity decreases and the cross-sectional area increases, the pressure energy of the water increases. Thus, the draft tube allows for pressure recovery and increases the effective head across the turbine.
In summary, the main function of the draft tube in a hydraulic reaction turbine is to increase the effective head across the turbine. By providing a gradual expansion path for the water, the draft tube helps in converting the kinetic energy into pressure energy and recovering the lost pressure head. This increase in effective head improves the performance and efficiency of the turbine, allowing for the generation of more useful work.
Introduction
A draft tube is an essential component of a hydraulic reaction turbine. It is a conical or diverging section of the turbine that is situated immediately after the runner (the rotating part). The primary purpose of the draft tube is to improve the performance and efficiency of the turbine.
Increase in Effective Head
The draft tube helps in increasing the effective head across the turbine. The effective head refers to the energy available at the inlet of the turbine. It is the difference between the head at the inlet and the head at the outlet of the turbine.
Conversion of Velocity Energy to Pressure Energy
When the water passes through the runner of the turbine, it gains kinetic energy due to the high velocity of the water. This kinetic energy needs to be converted into pressure energy to generate useful work. The draft tube plays a crucial role in this conversion process.
Acceleration in the Runner
As the water flows through the runner, its velocity increases. This acceleration causes a drop in the pressure head. However, the draft tube allows the water to expand gradually, reducing the velocity and converting the kinetic energy back into pressure energy.
Pressure Recovery
The draft tube acts as a diffuser, gradually increasing the cross-sectional area of the flow path. This expansion helps in recovering the pressure head lost in the runner. As the velocity decreases and the cross-sectional area increases, the pressure energy of the water increases. Thus, the draft tube allows for pressure recovery and increases the effective head across the turbine.
Conclusion
In summary, the main function of the draft tube in a hydraulic reaction turbine is to increase the effective head across the turbine. By providing a gradual expansion path for the water, the draft tube helps in converting the kinetic energy into pressure energy and recovering the lost pressure head. This increase in effective head improves the performance and efficiency of the turbine, allowing for the generation of more useful work.
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
The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. Can you explain this answer?
Question Description
The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. 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 The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. 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 The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. Can you explain this answer?.
The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. 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 The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. 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 The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. Can you explain this answer?.
Solutions for The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. 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 The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The main function of the draft tube in a hydraulic reaction turbine is toa)Reduce the effective head across the turbineb)Increase the discharge and hence the workc)Decrease the discharge to prevent flow separationd)Increase the effective head across the turbineCorrect answer is option 'D'. 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