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What is the dangerous speed of the rotor? 

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asked in tom by (215k points)
When a rotor of mass 100 kg is mounted on a shaft, a bending deflection of 0.1 mm is observed at the place where the rotor is place(d) What is the dangerous speed of the rotor?                                           

(a) 100 rpm                     (b) 750 rpm

(c) 1495 rpm                  (d) 2990 rpm

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