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Question
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?
Options:
A .  730 r.p.m.
B .  960 r.p.m.
C .  1440 r.p.m.
D .  2880 r.p.m.
Answer: Option A

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