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A synchronous machine can be connected to an energy system only when ___________

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A synchronous machine can be connected to an energy system only when ___________

(a) frequency/rotational speed matches

(b) voltage matches

(c) current matches

(d) power matches

I got this question during an interview.

My question is from Constructional Features of Rotating Electrical Machines-3 in section Constructional Features of Rotating Electrical Machines of Electrical Machines

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The correct choice is (a) frequency/rotational speed matches

To explain: For successful operation, the rotational speed/frequency of the synchronous machine must synchronize with the frequency of the energy system, and this is the reason for calling it a synchronous machine.

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