MEO Class II – MET : 2011/SEP/07 – 2011/DEC/07 – 2012/JAN/08 – 2012/FEB/08 – 2013/DEC/08 – 2014/FEB/08 – 2014/DEC/08 – 2024/DEC/08
Question
Q8. A. What is Silicon controlled rectifier (SCR)? How is the breakover voltage of the SCR defined? (6)
B. A d.c. motor takes an armature current of 110 A at 480 V. The resistance of the armature circuit 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)
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