Do you know about the Francis Turbine? You might think it’s a cool name for a racing car, but you’d be wrong. It’s actually a super important device that can help you pass your SSC JE exam with flying colors. Don’t panic, we’re here to help. We’ve created a fun and easy guide that will show you everything you need to know about this amazing machine.
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The Francis turbine is a reaction turbine, which means that the working fluid changes pressure as it moves through the turbine, giving up its energy. The turbine is located between the high-pressure water source and the low-pressure water exit, usually at the base of a dam.
Key Point:-
· It is used for medium head (60m to 300m)
· It is used for medium specific speed (60 to 300)
· Its flow ratio, Y = 0.15 – 0.30
· Speed ratio, ku = 0.60 – 0.90
· It is inward radial flow reaction turbine
Note-
(i) Old Francis turbine is inward radial flow turbine.
(ii) Modern Francis turbine is mixed flow reaction turbine (radial in & axial out).
Q. A Francis turbine is
(a) Inward flow reaction turbine
(b) Inward flow impulse turbine
(c) Outward flow reaction turbine
(d) Outward flow impulse turbine
ANS :- a
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