Engine_2014 : Electricity - 785/2299
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| From the instant of start-up, through the acceleration period, and until the motor reaches rated speed, when is the counter EMF produced in the windings of a DC motor 'zero'? |
| A) armature has just begun to turn |
| B) armature is not yet turning |
| C) motor is almost up to rated speed |
| D) motor is at rated speed |
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