SSE JE Electrical Engineering 24 March 2021 Shift 2 Paper

Question : 144 of 200

Marks: +1, -0

The three-lamp synchronisation method is used to synchronise an alternator with an infinite bus. In which of the following conditions will all the three lamps darken and brighten in step?

Phase is not the same, but voltage, frequency and phase sequence are the same.
Frequencies are not the same, but voltages and phase sequences are the same.
Phase sequences are not the same, but voltages and frequencies are the same.
Voltages are not the same, but frequency and phase sequence are the same.

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