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Overall efficiency is the sum of thermal and propulsive efficiency. True or false?

  • A.False, it is the product of the two
  • B.True, the contributions add
  • C.True, provided both exceed 0.5
  • D.False, it is their ratio

Answer: A

Because they multiply, values of 0.45 and 0.70 give 0.315 rather than 1.15, which would exceed one and be impossible. The multiplicative relation is why a weakness in either component caps the result rather than merely reducing it.

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