railway DFCCIL Executive 2025 Mock Test Electrical Machines Alternator and Synchronous Motors Alternator Parallel Operation
Which of the following is a necessary condition for the operation of two alternators in parallel?
1
The terminal voltage of both alternators must be different
2
The frequency of both the alternators must be different
3
Phase sequence and frequency of both the alternators must be different
4
Terminal voltage, frequency, and phase sequence must be the same