engineering recuitment BARC Stipendiary Trainee Category II 2023 Mock Test Electrician and Wireman Electrical Machines Alternators

1500 RPM पर एक 4-ध्रुव प्रत्यावर्तक चल रहा है। प्रत्यावर्तक की आवृत्ति _________ होगी।

1
30 Hz
2
40 Hz
3
60 Hz
4
50 Hz
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