Hydraulic Machines Questions

• The overall efficiency for a Pelton wheel lies between
• The gross or total head of the turbine is the __________ of the water levels at the head race and tail race.
• Which of the following statement is correct?
• Braking jet in an impulse turbine is used
• A hydraulic accumulator is a device used to store __________ energy which may be supplied to a machine later on.
• A reciprocating pump is also called a __________ displacement pump.
• The unit speed of the turbine runner is
• If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have
• Head developed by a centrifugal pump is
• The air vessel, in a reciprocating pump, is a cast iron closed chamber having an opening at its base.
• The function of guide vanes in a reaction turbine is to
• The number of buckets on the periphery of a Pelton wheel is given by
• The undershot water wheels are those in which
• A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?
• If the ratio of corresponding velocities at corresponding points are equal, then the model and the prototype are said to have dynamic similarity.
• The jet ratio is defined as the ratio of the
• In an impulse turbine, the pressure of water both at entering and leaving the vanes, is atmospheric.
• 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
• In an outward flow reaction turbine
• A jet of water enters and leaves a fixed curved vane tangentially. The force of the jet along normal to the vane is (where α and β = Inlet and outlet angles of the jet respectively)