engineering recuitment GATE EE 2023-24 Test Series Electrical Machines Three Phase Induction Motor Induction Motor Torque Speed Characteristics
A three phase 460 V, 60 Hz, six-pole wound rotor induction motor drives a constant load of 100 N-m at a speed of 1140 rpm when the rotor terminals are short-circuited. It is required to reduce the speed of the motor to 1000 rpm by inserting resistances in the rotor circuit. The rotor winding resistance per phase is 0.2 ohms. Neglect rotational losses. The stator to rotor turns ratio is unity.
The value of the resistance inserted is ________ (in Ω/phase)Enter numerical value using the virtual keypad. Round off where necessary.