Hydraulic Machines Questions

• Which of the following pump is suitable for small discharge and high heads?
• In a centrifugal pump, the regulating valve is provided on the
• Which of the following is not an impulse turbine?
• Which of the following pump is sucessfully used for lifting water to the boilers?
• The specific speed of a centrifugal pump may be defined as the speed of an imaginary pump, identical with the given pump, which will discharge one litre of water, while it is being raised through a head of one metre.
• In a reaction turbine, the water enters the wheel under pressure and flows over the vanes.
• A hydraulic press is a device used
• Slip of a reciprocating pump is negative, when
• Manometric head is the actual head of water against which a centrifugal pump has to work.
• The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is
• Which of the following pump is successfully used for lifting water to the turbines?
• The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is
• The speed ratio in case of Francis turbine varies from
• The power of a centrifugal pump working under constant head and discharge increases with the speed.
• Which of the following is not a reaction turbine?
• The cavitation in a hydraulic machine
• The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
• The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by
• A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is __________ of the jet velocity
• The action of a centrifugal pump is that of a reversed reaction turbine.