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单选题
To parallel an incoming machine to a running machine therefore it is necessary to ensure firstly that （）.
A
two frequencies must be brought into phase
B
the incoming machine accepts a small amount of load
C
the running machine must be unload
D
both voltages are equal
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单选题You are attempting to parallel two AC generators, and the syncope pointer is revolving in the fast directionThis indicates that the frequency of the incoming machine is （）.A
higher than the bus frequencyB
lower than the bus frequencyC
the same as the bus frequency but out of phase with itD
the same as the bus frequency and the circuit breaker may be closed at any pointer position
考题
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单选题Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine （）A
slightly less than the line frequencyB
the same as the line frequencyC
slightly greater than the line frequencyD
All of the above
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