In an ac servometer, the control winding is supplied with input voltag

1.	In an ac servometer, the control winding is supplied with input voltage of
A.	same frequency as the reference winding voltage but with 90 phase difference.
B.	same frequency as the reference windings voltage and also having same phase.
C.	any frequency compared to t he reference winding but with 90 phase difference.
D.	any frequency compared to the reference winding but of the same phase.
Answer» B. same frequency as the reference windings voltage and also having same phase.

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In an ac servometer, the control winding is supplied with input voltage of

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