railway UPMRC SCTO 2024 Mock Test Electrical Machines Alternator and Synchronous Motors Alternator Parallel Operation
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?
1
Phase is not the same, but voltage, frequency and phase sequence are the same.
2
Frequencies are not the same, but voltages and phase sequences are the same.
3
Phase sequences are not the same, but voltages and frequencies are the same.
4
Voltages are not the same, but frequency and phase sequence are the same.