SSC JE Electrical Engineering 2014 Set 2 Paper

Question : 151 of 200

Marks: +1, -0

The synchronous speed of a three phase induction motor having 20 polar and connected to a 50 Hz source is :

Solution:

∵

N_s = {120\f }/P

∴

N_s = {120 ×50 }/20

= 300 r.p.m.
∴ Option (b) is correct.

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