The safety limit of a crane is 42 tons, the mean weight and the standard deviation of a large number of iron rods are 0.2 ton and 0.5 ton respectively 20 rods are lifted at a time. Find the probability of an accident.

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