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  3. total marks 20 question 7 a a threephase 400 v...

Question: total marks 20 question 7 a a threephase 400 v...

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Total marks [20 Question 7 (a) A three-phase 400 V (rms)(line)(50 Hz) star-connected 4-pole induction motor has the following parameter values: Stator resistance = 0.18 Ω Stator reactance-0.62 Ω Referred rotor resistance 0.25 2 Referred rotor reactance 0.82 Ω The motor operates with a slip of 0.02 (i) (ii) (iii) Calculate the line current Calculate the starting current (slip of unity) Calculate the starting torque (slip of unity) Explain why torque is proportional to armature current for a DC motor. Why does this give the DC motor a favourable behaviour? Give a particular application example. (b) Total marks [20]

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