Discussion
Which of the following turbines is most suitable for high head and low flow rate applications?
Answer: D
The Pelton turbine is the most suitable for high head and low flow rate. It is an impulse turbine that works with a jet of water at high velocity from a high head, and so it needs a small quantity of water. The Kaplan turbine is for low head and high flow rate and the Francis turbine for medium head and medium flow rate, so they do not suit high head with low flow. The first option as printed is not a standard turbine name.
Specific speed confirms this: a Pelton wheel has a low specific speed, a Francis turbine a medium one and a Kaplan turbine a high one, so high head with low flow points to the Pelton wheel.
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