motor may be controlled remotely or automatically by using a
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A: mechanism of operation motion control lamp:
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A motor may be controlled remotely or automatically by using a
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- What is the mechanism of operation motion control lampA 300 V Series motor draws a current of 50 A. The field resistance is 40 m ohm and the armature resistance is 0.2 ohm. Determine the maximum efficiency of the motor.In the event of a power failure,a manual starter motor automatically restarts when the power returns.
- Hall effect sensors do not depend on electromagnetic induction to operate. Explain how they can sense the presence of a magnetic field if induction is not involved.Select the best answer for each of the following. The purpose of overload protection on a motor is to protect the a. motor from sustained overcurrents. b. wire from high currents. c. motor from sustained overvoltage. d. motor from short circuits.The symbol shown is a a. normally open pressure switch. b. normally open flow switch. c. normally open float switch. d. normally open temperature switch.
- 10.a. A normal commutator will have which one of the following colors where the brushes contact thecommutator?A. Slate-grayB. Chocolate-brownC. Auburn-brownD. Black 10.b. If an electronic control system is starting a motor, it will keep start-up current within limits by usingA. an acceleration ramp.B. coast-up system.C. a rheostat and a relay.D. a pulsed diode control.The pointer moving across a scale in the speedo meter is an example for ___________ of the instrumentation system. a.Feed back element b.Sensing element c.Data presentation element d.Signal conditioning element? drives are used to control the speed of electric motors and reduce the amount of power they consume. a. Analog b. Digital c. Electric Motor d. Motor
