Discussion
Consider the following statements about dc motor speed control.
1. Armature voltage control gives constant torque below base speed.
2. Field weakening gives constant power above base speed.
3. Armature resistance control is efficient.
Which are correct?
Answer: A
The first two describe the two working regions of a dc drive correctly. The third is wrong: the added resistance dissipates the voltage it drops, so efficiency falls roughly in proportion to the speed reduction obtained.
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