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Consider the following statements:
1. Specific speed uniquely determines the type, shape and design of the turbine.
2. Both unit speed ‘n11’ and unit discharge ‘Q11’ are necessary to uniquely determine the type and design of the turbine.
Which of these statements is/are correct in respect of a hydraulic turbine?
  • a)
    2 alone
  • b)
    1 alone
  • c)
    Both 1 and 2
  • d)
    Neither 1 nor 2
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following statements:1. Specific speed uniquely determine...
Specific speed is independent of dimension or size of the actual turbine and specific turbine

Therefore besides unit speed and unit discharge overall efficiency is also required to determine type and design of turbine.
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Most Upvoted Answer
Consider the following statements:1. Specific speed uniquely determine...
And specific speed are used to determine the performance of a turbine.
3. Specific speed is a dimensionless quantity that characterizes the geometry and performance of a turbine.

Which of the statements are true?

1. Specific speed uniquely determines the type, shape, and design of the turbine.
3. Specific speed is a dimensionless quantity that characterizes the geometry and performance of a turbine.

Statement 1 is true. Specific speed is a parameter that is used to classify and determine the type, shape, and design of a turbine. It gives an indication of the turbine's operating range and is used in selecting the appropriate turbine for a given application.

Statement 2 is false. Unit speed is not used to determine the performance of a turbine. Instead, specific speed is used for this purpose.

Statement 3 is true. Specific speed is a dimensionless quantity that is calculated using the rotational speed, flow rate, and head (or pressure difference) of a turbine. It characterizes the geometry and performance of the turbine and is used for comparing different turbine designs.
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