The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

A. 2V/(vr - v)

B. 2V/(vr + v)

C. V/(vr - v)

D. V/(vr + v)

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  11. The specific speed of a turbine is given by the equation
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  14. Which type of the pump is different from others in the same group?
  15. The optimum value of vane exit angle for a centrifugal pump impeller is
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  25. Delivery head of a centrifugal pump is
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