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Question

Q8. A. What is silicon controlled rectifier (SCR)? How is the break over voltage of the SCR defined?  B. A d.c. motor takes an armature current of 110 A at 480 V. The resistance of the armature circuit is 0.2 . The machine has six poles and the armature is lap-connected with 864 conductors. The flux per pole is 0.05 Wb. Calculate - (i) The speed; (ii) The gross torque developed by the armature

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