Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Which of the following turbine does not requi...
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Which of the following turbine does not require draft tube ?
- a)Kaplan turbine
- b)Pelton turbine
- c)Francis turbine
- d)Propeller turbine
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Which of the following turbine does not require draft tube ?a)Kaplan t...
Concept:
- In Impulse Turbine, the available hydraulic energy is first converted into kinetic energy by means of an efficient nozzle
- The high-velocity jet issuing from the nozzle then strikes a series of suitably shaped buckets fixed around the rim of a wheel
- The buckets change the direction of the jet without changing its pressure
- The resulting change in momentum sets buckets and wheels into rotary motion and thus mechanical energy is made available at the turbine shaft
- The fluid jet leaves the runner with a reduced energy
- The impulse turbine doesn't use a draft tube. Ex. Pelton wheel
- The draft tube is used only in Reaction turbines. Ex. Francis turbine, Kaplan turbine, Propeller turbine
Draft Tube:
- The draft tube is a conduit that connects the runner exit to the tailrace where the water is being finally discharged from the turbine. It is used with reaction turbines only.
- The draft tube has two purposes as follows if
- It permits a negative or suction head to be established at the runner exit, thus making it possible to install the turbine above the tailrace level without loss head.
- It converts a large proportion of velocity energy rejected from the runner into useful pressure energy.
- A draft tube is made divergent so as to reduce the velocity at the outlet to a minimum. Therefore, a draft tube is basically a diffuser and should be designed properly with the angle between the walls of the tube to be limited to about 8 degrees so as to prevent the flow separation from the wall and to reduce accordingly the loss of energy in the tube.
From the equation of the continuity,
A1V1 = A2V2
V∝1/A
The area at the exit is higher, therefore the velocity of discharged water will be lower.
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Community Answer
Which of the following turbine does not require draft tube ?a)Kaplan t...
Concept:
- In Impulse Turbine, the available hydraulic energy is first converted into kinetic energy by means of an efficient nozzle
- The high-velocity jet issuing from the nozzle then strikes a series of suitably shaped buckets fixed around the rim of a wheel
- The buckets change the direction of the jet without changing its pressure
- The resulting change in momentum sets buckets and wheels into rotary motion and thus mechanical energy is made available at the turbine shaft
- The fluid jet leaves the runner with a reduced energy
- The impulse turbine doesn't use a draft tube. Ex. Pelton wheel
- The draft tube is used only in Reaction turbines. Ex. Francis turbine, Kaplan turbine, Propeller turbine
Draft Tube:
- The draft tube is a conduit that connects the runner exit to the tailrace where the water is being finally discharged from the turbine. It is used with reaction turbines only.
- The draft tube has two purposes as follows if
- It permits a negative or suction head to be established at the runner exit, thus making it possible to install the turbine above the tailrace level without loss head.
- It converts a large proportion of velocity energy rejected from the runner into useful pressure energy.
- A draft tube is made divergent so as to reduce the velocity at the outlet to a minimum. Therefore, a draft tube is basically a diffuser and should be designed properly with the angle between the walls of the tube to be limited to about 8 degrees so as to prevent the flow separation from the wall and to reduce accordingly the loss of energy in the tube.
From the equation of the continuity,
A1V1 = A2V2
V∝1/A
The area at the exit is higher, therefore the velocity of discharged water will be lower.
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Which of the following turbine does not require draft tube ?a)Kaplan turbineb)Pelton turbinec)Francis turbined)Propeller turbineCorrect answer is option 'B'. Can you explain this answer?
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Which of the following turbine does not require draft tube ?a)Kaplan turbineb)Pelton turbinec)Francis turbined)Propeller turbineCorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Which of the following turbine does not require draft tube ?a)Kaplan turbineb)Pelton turbinec)Francis turbined)Propeller turbineCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following turbine does not require draft tube ?a)Kaplan turbineb)Pelton turbinec)Francis turbined)Propeller turbineCorrect answer is option 'B'. Can you explain this answer?.
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