A 10 kW, 400 V, 3-phase, 4-pole, 50 Hz induction motor develops the rated output at rated voltage with its slip rings shorted. The maximum torque is twice the full load torque occurs at the slip of 10% with zero external resistance in the rotor circuit. An external resistance is now tripled in the rotor circuit. Then the stator current will _________
(a) remain constant
(b) increase
(c) decrease
(d) any of the mentioned
I had been asked this question by my school principal while I was bunking the class.
My doubt is from Operating (or Performance) Characteristics of Induction Motors topic in section Induction Machines of Electrical Machines
