If α, ß are the roots of ax² + bx + c = 0, then – 1 / α , 1 / ß are the roots of

(a) ax² – bx + c = 0

(b) cx² – bx + a = 0

(c) cx² + bx + a = 0

(d) ax² – bx – c = 0

A Pelton wheel works under a water power of 1.3MW. The hydraulic efficiency of turbine is 95%. Find runner power developed. If mechanical efficiency of turbine is 90%. Find overall efficiency and shaft power of turbine.

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hello sir mere jee main 2021 me 98.1 persentile h ,meri rank kya hogi ,also i belog to obc categry so please tell me also the obc rank . please A humble request by a student