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Low specific speed of a turbine implies it is

Low specific speed of a turbine implies it is Correct Answer Impulse turbine

Specific speed is defined as the speed of a turbine which is identical in shape, geometrical dimensions, blade angles, gate opening etc. with the actual turbine but of such a size that it will develop unit power when working under the unit head. This is used to compare the different types of turbines as every type of turbine has different specific speed.

Following are the range of specific speed of different turbines

Pelton (Impulse Turbine)- 9-30

Francis- 51-225

Kaplan or Propeller turbine- 255-860

So option C is correct as Impulse turbine has the lowest specific speed.

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