engineering recuitment NHPC JE & THDC JE 2023 Mock Test Electrical Machines Single Phase Motor and Special Machines
A 230 V, 50 Hz, 4-pole, single-phase induction motor is rotating clockwise (forward) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω, then the effective rotor resistance in the backward branch of the equivalent circuit will be
1
2.0 Ω
2
4.0 Ω
3
78 Ω
4
156 Ω