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Two heavy rotors are mounted on a single shaft. Considering each of the rotors separately, the transverse natural frequencies are 100 cycles and 200 cycles/s, respectively. The lower critical speed will be                             

         (a) 12000 r.p.m               (b) 9360 r.p.m

         (c) 8465 r.p.m                 (d) 5367 r.p.m

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