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.
A. 1/2
B. 3/44
C. 59/46
D. 7/12
Show Answer
Answer: B
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