7. 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
Correct Answer: the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
9. A jet of water enters and leaves a fixed curved vane tangentially. The force of the jet along normal to the vane is (where ? and ? = Inlet and outlet angles of the jet respectively)