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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Which of the following is the symbol for an induced draft cross flow tower?
Figure
Two technicians are discussing a state emission test. Technician A says that a vent valve that is not able to close can cause the system to fail the on-board test. Technician B says that a leaking gas cap can cause a failure of the EVAP test. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
What is the purpose of the hot and cold decks on a multi-zone system?
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What is the minimum truck class rating required to haul a load of 34,000 pounds?
A. Class 5 B. Class 6 C. Class 7 D. Class 8