Impulse turbine (Pelton): Maximum practical number of jets without interference Assume standard bucket geometry and proper angular spacing to avoid jet interference at the runner. Choose the typical maximum number of jets used.

Concept/Approach

• Multiple jets increase flow (and power) at a given head by adding parallel jets spaced around the runner.
• To avoid interference, jets are typically spaced uniformly; practical design and bucket geometry generally limit the number.

Answer reasoning
In practice, up to six jets are commonly employed on a Pelton runner without interference; more jets complicate spacing and often degrade performance.

Final Answer
Six