Discussion
A dc motor is described as a 1,500 rpm machine. That figure is
Answer: B
Correct answer: its speed at rated voltage, rated flux and rated load
A nameplate speed is the speed under the full set of rated conditions, and it is the datum against which regulation and field weakening range are quoted. The machine runs somewhat faster than this on no load, and faster again with the field weakened; and the highest safe speed is a separate figure, set by centrifugal stress and commutation and usually stated on the plate as a maximum.
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