Q. The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship, will be maximum when the relative velocity of the jet and ship is equal to twice the velocity of the ship.

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Q. The cavitation in reaction turbines is avoided, to a great extent by

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Q. Which type of the pump is different from others in the same group?

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Q. Power required to drive a centrifugal pump is __________ proportional to N3.

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Q. The force exerted (in newton) by a jetof water impinging normally on a fixed plate is (where w = Specific weight of water in N/m³, a = Cross-sectional area of jet in m², and V = Velocity of jet in m/s)

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Q. A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit discharge of wheel is

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Q. Delivery head of a centrifugal pump is

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Q. The power developed by a turbine is (where H = Head of water under which the turbine is working)

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Q. If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

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Q. A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.

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Q. In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows.

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Q. A Pelton wheel is

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Q. The discharge through a reaction turbine __________ with the increase in unit speed.

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Q. In a mixed flow reaction turbine, the flow of water is partly radial and partly axial.

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Q. A Pelton wheel with one nozzle is preferred for a specific speed between 35 to 60 r.p.m.

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Q. Which of the following pump is generally used to pump highly viscous fluid?

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Q. The overall efficiency of an impulse turbine is the ratio of the actual power produced by the turbine to the energy actually supplied by the turbine.

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Q. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

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Q. If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.

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Q. The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

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