Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 2, Problem 6SQ
To determine
Choose the best option which represents a fractional horse power manual motor starter.
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A starter turns very slowly and has excessive cranking current draw. When removed from the vehicle and bench tested, the starter spins normally and current draw is within specifications. Technician A says poor battery connections may be the cause. Technician B says an internal engine problem may be the cause. Who is correct?
3. Explain the difference between manual motor starters that provide low voltage release and those that do not.
A type of resistance device that can be placed in a DC motor circuit and varied to limit the speed of a motor is called a
A. potentiometer. B. variable reluctor. C. rheostat.D. power resistor.
Chapter 2 Solutions
Electric Motor Control
Ch. 2 - If the contacts on a manual starter cannot be...Ch. 2 - If the handle of an installed motor starter is in...Ch. 2 - How may an automatic operation be achieved when a...Ch. 2 - What does the term trip-free mean as it relates to...Ch. 2 - Prob. 5SQCh. 2 - Prob. 6SQCh. 2 - Prob. 7SQCh. 2 - Prob. 8SQCh. 2 - Select the best answer for each of the following....Ch. 2 - Select the best answer for each of the following....
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Technician A says when testing the voltage output, if the charging voltage is too high, the cause could be an open field wire from the regulator. Technician B says a loose or glazed drive belt could be the cause of too high charging voltage. Who is correct? A only B only Both A and B Neither A or B Technician A says that poor connection at the generator output wire can cause charging systems problems. Technician B says that many charging system circuits contain a circuit protection device. Who is correct? A only B only Both A and B Neither A or Barrow_forwardWhat is the name of the device shown below? CE O a. DC regulated powersunpy: Ob.C.R.O Oc. Control Panel Od.Function Generatorarrow_forwardA motor starter contains protection devices to prevent an overcurrent condition in the motor's circuit. These devices are known as A. thermal overloads. B. circuit breakers. C. thermal links.D. fuses.arrow_forward
- I would like the answers to be typed pleasearrow_forwardRefer to the preceding Practical Application. When the 30-HP motor is replaced with the 50-HP, will the existing motor starter have to be replaced? If so, what size starter should be selected? A NEMA size 3 starter was used for the 30-HP motor.arrow_forwardexplain in detail and type the solutionarrow_forward
- 1. Explain what are Temperature sensors and how does it work. 2. Explain what are Magnetic Switches and how does it work.arrow_forwardQUESTION 12 The proper way to determine the required over-current protection is to: determine the FLA based on the nameplate. Use the standard rule of thumb that the over-current protection shall be 7 to 10x the locked rotor amps. determine the watts by converting the HP rating on the nameplate to watts. to determine the FLC by looking up the value in the appropriate table(s) in the NEC as they relate to the horsepower of the motor.arrow_forwardWrite any four methods of voltage control.arrow_forward
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