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2.(a) A turbine rotor weighs 20 tonnes and has a radius of gyration of 1.75 meter when running at 200 rpm. It is suddenly relieved of part of its load and its speed rises to 205 rpm in 1 sec. Find the unbalanced uniform tuning moment.
(b) Find the diameter of a hollow shaft of diameter ratio of 2/3 to transmit 500 h.p (metric) at 250 rpm if the allowable shear stress is 450 kg / cm2and the maximum torque is 30 % greater than the mean.

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