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A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to | |
A. | decrease the firing angle [Correct Answer] |
B. | increase the firing angle [Wrong Answer] |
C. | either decrease or increase the firing angle depending on the required speed [Wrong Answer] |
D. | decrease the load torque [Wrong Answer] |