5. A4-pole, 3-phase, 50 Hz induction motor has a voltage between slip-rings on open-circuit of 520 V. The star-connected rotor has a standstill reactance and resistance of 2.0 and 0.4 ohm. per phase respectively. Determine: (a) the full-load torque if full-load speed is 1,425 r.p.m. (b) the ratio of starting torque to full-load torque (c) the additional rotor resistance required to give maximum torque at standstill.

 5. A4-pole, 3-phase, 50 Hz induction motor has a voltage between slip-rings on open-circuit of 520 V. The

star-connected rotor has a standstill reactance and resistance of 2.0 and 0.4 ohm. per phase respectively.

Determine:

(a) the full-load torque if full-load speed is 1,425 r.p.m.

(b) the ratio of starting torque to full-load torque

(c) the additional rotor resistance required to give maximum torque at standstill.




















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