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MEO Class II – MET : 2017/APR/10 – 2019/FEB/10 – 2021/FEB/09 – 2016/OCT/10
Question

Q9. A. Explain the effect of making incorrect phase and starter connections.

B. A 440V shunt motor tenets an armature current of 30A at 700 rev/min. The armature resistance is 0.7ohm. If the flux is suddenly reduced by 20 per cent, to what value will the armature current rise momentarily? Assuming unchanged resisting torque to motion, what will be the new steady values of speed and armature current? Sketch graphs showing armature current and speed as functions of time during the transition from initial to final, steady-state conditions.

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