railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrician and Wireman Electrical Machines Alternators

In an alternator, an induced e.m.f. (EMF) of frequency (f) is given by _____ .

1
f = PN/120
2
f = 120N/P
3
f = 120P/N
4
f = 120/PN
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