Discussion
For connecting an alternator to the grid, the phase angle between the generated voltage and the voltage of the grid must be ______.
Answer: A
For connecting an alternator to the grid, the phase angle between the generated voltage and the grid voltage must be 0°, that is the two voltages must be in phase. Along with equal voltage, equal frequency and the same phase sequence, this lets the breaker be closed without a surge of current.
A phase angle of 45°, 60° or 90° would mean a voltage difference across the breaker at the moment of closing, which would cause a large circulating current and a mechanical shock to the machine. So the first option is correct.
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