Q. In a reciprocating pump, air vessels are used to

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Q. In a Francis turbine, the pressure at inlet is __________ that at outlet.

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Q. If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

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Q. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

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Q. The impeller of a centrifugal pump may have

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Q. Kinematic similarity is said to exist between the model and the prototype, if both of them

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Q. Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m³, Q = Discharge of the pump in m³/s, and ηo = Overall efficiency of the pump)

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Q. A reciprocating pump is suitable for less discharge and higher heads.

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Q. The flow ratio of Francis turbine is defined as the ratio of the

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Q. The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.

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Q. An impulse turbine is used for

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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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