Answer the following statement(s) true (T) or false (F)
1. The external wiring diagram is used to locate problems and failures in the operation of the controller.
2. One of the most advantageous characteristics of the motor-generator set drive is its inherent capability to regenerate.
3. Electrically controlled, variable speed motor drives offer a wide choice of speed ranges, torque, and horsepower characteristics.
4. For some machinery with precise requirements, AC motors provide characteristics that are not available on DC motors.
5. Static DC drives utilize moving parts in the power conversion equipment that converts (rectifies) and controls the AC power.
1. FALSE
2. TRUE
3. TRUE
4. FALSE
5. FALSE
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Answer the following statement(s) true (T) or false (F)
1.It is possible to determine the direction of rotation of a motor before power is connected to it. 2.The phase windings of a delta-connected motor must be connected in parallel for use on low voltage. 3.The starting torque of a squirrel-cage motor is high. 4.If it is intended that the motor maintain constant torque for both low and high speeds, the parallel wye connection will provide low speed and the series delta will provide high speed 5.The speed of a wound-rotor motor is uncontrollable.
An engineering student has only 45 minutes before the final exam in her Engineering Economy class. She needs help in understanding cost-effectiveness analysis because she knows from the instructor’s review session that a CEA problem will be on the exam. There is time for using only one method of assistance before the exam; she must select well. In a rapid process of estimation, she determines how many minutes it would take for each method of assistance and how many points it might gain for her on the final. The method and estimates follow. Where should she seek help to be most effective?
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An aftermarket satellite radio has poor reception. Technician A says that a lack of a proper ground plane on the antenna could be the cause. Technician B says that mountains or tall buildings can interfere with reception. Who is right?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
The control circuit ________
A) includes switches and other controls in a circuit B) includes the motor and other controls in a circuit C) includes the motor and other loads in a circuit D) all of the above