Q.

The maximum efficiency of a reaction turbine is

  • A2 sin²α/(1 + sin²α)
  • B2 cos²α/(1 + cos²α)
  • C(1 + sin²α)/2 sin²α
  • D(1 + cos²α)/2 cos²α
Correct Answer : (B)

2 cos²α/(1 + cos²α)

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