Question

695. A 3-phase star-connected induction motor is connected to 400 V,
50 Hz ac supply. If the stator to rotor turn ratio is 2, the standstill
rotor induced emf per phase is
(a) 115.5 V (b) 231 V (c) 346.5 V (d) 200 V​

Answer 1

Answer:

Explanation:stator /rotor ratio=2

stator voltage per phase=400/$\sqrt{3}$

rotor induced emf /phase=400/$\sqrt{3}$ /2=115.5v