Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 59, Problem 8SQ
What might be a hazard if a motor is started in the wrong direction?
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Chapter 59 Solutions
Electric Motor Control
Ch. 59 - Prob. 1SQCh. 59 - Why should the motor be run for a period of time...Ch. 59 - What may occur if a jumper is placed across coil M...Ch. 59 - In what position do ball-bearing motors function?Ch. 59 - Motors will operate satisfactorily at what percent...Ch. 59 - What basic sensory faculties should a...Ch. 59 - What is an orderly step-by-step procedure in...Ch. 59 - What might be a hazard if a motor is started in...Ch. 59 - Prob. 9SQCh. 59 - What are the probable causes of a noisy magnet?
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- One type of failure that's more common with 200 HP motors than with 10 HP motors is A. rotor bar failure.B. contactor failure.C. bearing failure. D. stator failures.arrow_forwardIf the speed of the driving motor falls due to loading what will be the effects?arrow_forwardHow to avoid the effect of the high current at starting of the Motor? a. variable resistor is connected in series with Armature circuit b. variable resistor is connected in parallel with Armature circuit c. variable resistor is connected in series with field circuit d. None of the above Clear my choicearrow_forward
- How can you reduce the amount of voltage applied to the motor during inching?arrow_forwardWhy do you think some motor control circuit utilizes single voltage sources for control and power circuit? Explain.arrow_forwardWhat is the motor used for pumping water in domestic application? Why?arrow_forward
- The most common failure item with a three-phase induction motor system is the A. rotor bars.B. stator windings.C. bearings. D. controller or starter.arrow_forwardWhy are circulating currents detrimental to good motor operation?arrow_forwardWhat happens to a series connected direct current motor if its field winding opens at full load?arrow_forward
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