Hydraulic Machines Questions

• 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.
• In an inward flow reaction turbine
• 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
• 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
• In a Francis turbine, the pressure at inlet is __________ that at outlet.
• Which type of the pump is different from others in the same group?
• In a reciprocating pump, air vessels are used to
• The unit power developed by a turbine is (where P = Power developed by the turbine under a head of water (H))
• In a mixed flow reaction turbine, the flow of water is partly radial and partly axial.
• Overall efficiency of a centrifugal pump is the ratio of
• A hydraulic ram is a device used to
• A Kaplan turbine is an axial flow reaction turbine.
• In a mixed flow centrifugal pump, the flow through the impeller is a combination of radial and axial flows.
• The cavitation in reaction turbines is avoided, to a great extent by
• Dynamic similarity is said to exist between the model and the prototype, if both of them
• If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.
• 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.
• 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
• The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is __________ of the jet velocity,
• A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure.