What accounts for the flattened slope of the speed torque curve of the series motor in the accompanying figure?
What will be an ideal response?
When a mechanical load is added to the series motor, the motor slows with a new, higher torque requirement. As the motor slows, the CEMF in the rotor is reduced and the line current is allowed to increase. This affects both the stator field and the rotor field. With a drop in speed, the torque is increased dramatically, and the motor runs at a lower speed but with much larger torque. This gives the speed torque curve its flattened slope.
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Pitch diameter is the distance from:
A. The tip of a tooth to the tip of the tooth on the opposite side. B. The base of a tooth, where it meets the wheel, to the base of the tooth on the opposite side. C. The approximate center of a tooth to the approximate center of the tooth on the opposite side. D. The tip of a tooth to the tip of an adjacent tooth.
How do you correct a rear-wheel acceleration skid?
a. Apply more power to the wheels. b. Stop accelerating. c. Apply the brakes. d. Downshift.
What schematic symbol is shown in the accompanying figure?
a. Transformer
b. Lamp
c. Single-Phase Squirrel-Cage Motor
d. Three-Phase Squirrel-Cage Motor
The first item contained within a feature control frame is always a ____.
A. geometric characteristic symbol B. geometric symbol C. geometric symbol modifier D. characteristic geometric symbol