You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow directionThis indicates that the frequency of the incoming machine is （）.<br>A:higher than the bus frequency<br>B:lower than the bus freouencv<br>C:the same as the bus frequency but out of phase with it<br>D:the same as the bus frequency, and the circuit breaker may be closed at any pointer position

You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow directionThis indicates that the frequency of the incoming machine is （）.
A:higher than the bus frequency
B:lower than the bus freouencv
C:the same as the bus frequency but out of phase with it
D:the same as the bus frequency, and the circuit breaker may be closed at any pointer position

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