engineering recuitment MAHATRANSCO AE Electrical Mock Test Electrical Machines Three Phase Induction Motor
The rotor of a four-pole, 50 Hz slip-ring induction motor has a resistance of 0.2 Ω per phase and runs at 1425 rpm at full-load. Determine the external resistance per phase which must be added to reduce the speed to 1200 rpm, the torque remaining same in both the cases.
1
0.4 Ω
2
0.8 Ω
3
0.2 Ω
4
0.10 Ω
5
0.6 Ω