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.

Related MCQs

• 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.
• A Francis turbine is an outward flow reaction turbine.
• A Francis turbine is used when the available head of water is
• The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, 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?
• The speed of an imaginary turbine, identical with the fiven turbine, which will develop a unit power under a unit head, is known as
• The efficiency of a reaction turbine for a given head
• The flow ratio of Francis turbine is defined as the ratio of the
• The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.
• The flow ratio in case of Francis turbine varies from