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A PMDC commutator motor has a no-load speed of 6,000 rpm when connected to a 120 V dc supply. The armature resistance is 2.5 Ω and other losses may be neglected. The speed of the motor, when supply voltage of 60 V developing a torque of 0.5 Nm, is | |
A. | 3,000 rpm. [Wrong Answer] |
B. | 2,673 rpm. [Correct Answer] |
C. | 2,836 rpm. [Wrong Answer] |
D. | 5,346 rpm. [Wrong Answer] |