SSC JE Civil Engineering 2017 Set 4 Solved Paper

Question : 144 of 200

Marks: +1, -0

In the selection of turbine by specific speed or head, which one of the following statements is not correct ?

For specific speed 10 - 35, Kaplan turbines
For specific speed 60 - 300, Francis turbines
For head 50 - 150 m, Francis turbines
For head above 300 m, Pelton wheel

Solution:

Well-designed efficient machines typically use the following values: Impulse turbines have the lowest

N_S

values, typically ranging from 1 to 10, a Pelton wheel is typically around 4, Francis turbines fall in the range of 10 to 100, while Kaplan turbines are at least 100 or more, all in imperial units.

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