Question :
The speed of a separately excited dc motor is controlled below base speed by using a type-A SCR based chopper. The supply voltage is 220 V dc and the armature resistance is 0.5 Ω. Calculate the minimum value of firing angle if the motor drives a constant torque load requiring an average armature current of 30 A.
1. 1/2
2. 3/44
3. 59/46
4. 7/12
Answer :
2 - 3/44
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