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The correct sequence of the given hydraulic turbines in decreasing order of their specific speeds is
- a)Pelton wheel, Francis turbine and kaplan turbine
- b)propeller turbine, Francis turbine and pelton wheel
- c)kaplan turbine, Pelton wheel and Francis turbine
- d)Francis turbine, kaplan turbine and pelton wheel
Correct answer is option 'B'. Can you explain this answer?
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The correct sequence of the given hydraulic turbines in decreasing ord...
-The hydraulic turbine is a mechanical device that converts the potential energy contained in an elevated body of water (a river or reservoir) into rotational mechanical energy. Selecting the type, kind, (within type) configuration, (horizontal or vertical) size, and number of turbine.
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-The specific speed value for a turbine is the speed of a geometrically similar turbine which would produce unit power (one kilowatt) under unit head (one meter). The specific speed of a turbine is given by the manufacturer (along with other ratings) and will always refer to the point of maximum efficiency.
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The correct sequence of the given hydraulic turbines in decreasing ord...
The correct sequence of the given hydraulic turbines in decreasing order of their specific speeds is:
The correct answer is option 'B' which states that the sequence is propeller turbine, Francis turbine, and Pelton wheel.
Explanation:
1. Specific speed:
Specific speed is a parameter used to compare the performance of different hydraulic turbines. It is defined as the speed at which a turbine of unit specific speed would operate if it were geometrically similar to the actual turbine and had a head of 1 m. It is represented by the symbol Ns.
2. Propeller turbine:
A propeller turbine is a type of hydraulic turbine used for low head applications. It consists of a fixed runner with a large number of blades. The water flows through the runner in an axial direction, similar to the flow in a ship propeller. Propeller turbines have a high specific speed, which means they are designed to operate at high speeds for a given head. They are most suitable for low head, high flow rate applications.
3. Francis turbine:
A Francis turbine is a type of hydraulic turbine used for medium head applications. It consists of a runner with adjustable blades. The water enters the turbine radially and exits axially. Francis turbines have a medium specific speed, which means they are designed to operate at moderate speeds for a given head. They are most suitable for medium head, medium flow rate applications.
4. Pelton wheel:
A Pelton wheel is a type of hydraulic turbine used for high head applications. It consists of a runner with a series of double-cupped buckets. The water enters the turbine tangentially and impinges on the buckets, causing the runner to rotate. Pelton wheels have a low specific speed, which means they are designed to operate at low speeds for a given head. They are most suitable for high head, low flow rate applications.
Conclusion:
Based on the specific speeds of the three turbines, the correct sequence in decreasing order of their specific speeds is propeller turbine, Francis turbine, and Pelton wheel. This sequence is consistent with option 'B'.
The correct answer is option 'B' which states that the sequence is propeller turbine, Francis turbine, and Pelton wheel.
Explanation:
1. Specific speed:
Specific speed is a parameter used to compare the performance of different hydraulic turbines. It is defined as the speed at which a turbine of unit specific speed would operate if it were geometrically similar to the actual turbine and had a head of 1 m. It is represented by the symbol Ns.
2. Propeller turbine:
A propeller turbine is a type of hydraulic turbine used for low head applications. It consists of a fixed runner with a large number of blades. The water flows through the runner in an axial direction, similar to the flow in a ship propeller. Propeller turbines have a high specific speed, which means they are designed to operate at high speeds for a given head. They are most suitable for low head, high flow rate applications.
3. Francis turbine:
A Francis turbine is a type of hydraulic turbine used for medium head applications. It consists of a runner with adjustable blades. The water enters the turbine radially and exits axially. Francis turbines have a medium specific speed, which means they are designed to operate at moderate speeds for a given head. They are most suitable for medium head, medium flow rate applications.
4. Pelton wheel:
A Pelton wheel is a type of hydraulic turbine used for high head applications. It consists of a runner with a series of double-cupped buckets. The water enters the turbine tangentially and impinges on the buckets, causing the runner to rotate. Pelton wheels have a low specific speed, which means they are designed to operate at low speeds for a given head. They are most suitable for high head, low flow rate applications.
Conclusion:
Based on the specific speeds of the three turbines, the correct sequence in decreasing order of their specific speeds is propeller turbine, Francis turbine, and Pelton wheel. This sequence is consistent with option 'B'.
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The correct sequence of the given hydraulic turbines in decreasing order of their specific speeds isa)Pelton wheel, Francis turbine and kaplan turbineb)propeller turbine, Francis turbine and pelton wheelc)kaplan turbine, Pelton wheel and Francis turbined)Francis turbine, kaplan turbine and pelton wheelCorrect answer is option 'B'. Can you explain this answer?
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