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A pair of synchronous machines on the same shaft may be used to generate power at 60 Hz from given source of power at 50 Hz. Using minimum number of poles for both the machines, the synchronous speed will be (a) 500 r.p.m. (b) 600 r.p.m. (c) 1000 r.p.m. (d) 1200 r.p.m. 
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