railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical Machines Alternator and Synchronous Motors
Which statements about voltage drop in an alternator are correct?
I. The voltage drop due to armature resistance (IaRa) is in phase with the armature current (Ia).
II. At unity power factor, the voltage drop IaRa directly subtracts from the generated EMF (E).
III. For a leading power factor load, IaRa contributes to an increase in terminal voltage (V).
IV. Armature resistance has no effect on voltage regulation.
1
Statements III and IV only are correct.
2
Statements I and II only are correct.
3
Statements II and III only are correct.
4
Statements I and IV only are correct.