Answer / birinchi narayan borua

dc exicitation through slip ring is used to get uniform
sinusoidal magnetic flux in the rotor winding which will
lock with the sinusidal magnetic flux of the stator
winding, and hence rotate with synchronous speed.

Answer / dipen

by giving the Dc excitation it will create imagenary
poles to lock the stator pole so that syn.motor run at
syn.speed.

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