Hydraulic Machines Questions

• Which of the following statement is correct as regard to water wheels?
• The hydraulic efficiency of an impulse turbine is the
• Which of the following statement is wrong?
• The ratio of the normal force of jet of water on a plate inclined at an angle of 30° as compared to that when the plate is normal to jet, is
• The efficiency of a reaction turbine for a given head __________ with the increase in speed.
• Which of the following pump is successfully used for lifting water from deep wells?
• A double overhung Pelton wheel has
• Mechanical efficiency of a centrifugal pump is the ratio of
• The specific speed (Ns) of a centrifugal pump is given by
• Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?
• The discharge through a turbine is
• The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger)
• The Thomson's turbine is __________ reaction turbine.
• The flow ratio in case of Francis turbine varies from
• The cavitation in a hydraulic machine is mainly due to
• The Furneyron turbine is __________ reaction turbine.
• The head available at the inlet of the turbine is known as net or effective head.
• A Francis turbine is an outward flow reaction turbine.
• Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?
• In an axial flow reaction turbine, the water flows __________ to the axis of the wheel.