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 mentionedI 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

A 10 kW, 400 V, 3-phase, 4-pole, 50 Hz induction motor develops the ra

1.	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 mentionedI 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
Answer» The correct ANSWER is (a) remain constant To explain: As the RATIO of r2/s is constant, the changes will not be reflected to the STATOR.

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