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Q6. a) What is a silicon-controlled rectifier (SCR)? How is the breakover 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 circuits is 0.2Ω. The machine has six poles and the armature is lap-connected with 864 conductors. The flux per pole is 0.05 Wb. Calculate

a) The speed:

b) The gross torque developed by the armature. (10)