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GATE CE 2020: Fluid Mechanics Quiz 9
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Question 1
A multistage pump lifts 6000 cubic metre/minute against a total head of 215 m, at a speed of 750 rpm. The specific speed is limited to 750. The number of the impellers required for multistage pump is
Question 2
A double jet Pelton wheel has a specific speed of 15 (SI units) and is required to deliver a power of 1500 kW. The turbine is supplied through a pipeline from a reservoir whose level is 500 m above the nozzles. Allowing 5% for friction loss in the pipe, the rotational speed is --------- rpm.
Question 3
A jet of water 100 mm in diameter having velocity of 25 m/s strikes a series of the flat plates arranged around the periphery of a wheel such that each plate appears successively before the jet. If the plates are moving at a velocity of 10 m/s, the force exerted by the jet on the plate is ______ kN.
Question 4
Assume that water vaporizes at an absolute pressure of 1.5 m, barometric pressure head is 9.5 m, cavitation coefficient is 0.1. A turbine operates under a head of 40 m. The safe height of the runner above the tail water level, in meters, is
Question 5
A hydraulic turbine develops 8000 kW when running at 300 rpm under a head of 45 m. the speed of the same turbine under a head of 60m is
Question 6
A pump impeller is 375 diameter and it discharges water with component velocities of 2 and 12 m/s in the radial and tangential directions respectively. The impeller is surrounded by a concentric cylindrical chamber with parallel sides the outer diameter being 450 mm. If the flow in this chamber is a free spiral vortex, the increase in pressure (in m) if there is no loss of head is
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