SSC JE 2023 Preparation-What is Francis Turbine?

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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FRANCIS TURBINE

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, k_u = 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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