Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 3, Problem 3SQ
If a motor starter is installed according to directions but will not start, what is a common cause for the failure to start?
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What causes the overload of a starter to open and disable the power circuit?
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Chapter 3 Solutions
Electric Motor Control
Ch. 3 - Prob. 1SQCh. 3 - How many poles are required on motor starters for...Ch. 3 - If a motor starter is installed according to...Ch. 3 - Using the time limit overload or the dashpot...Ch. 3 - What causes the AC hum or chatter in AC...Ch. 3 - What is the phase relationship between the flux in...Ch. 3 - In what AC and DC devices is the principle of the...Ch. 3 - What does the electrician look for to remedy the...Ch. 3 - What type of protective enclosure is most commonly...Ch. 3 - What advantage is there in using combination...
Ch. 3 - What safety feature does the combination starter...Ch. 3 - Prob. 12SQCh. 3 - How is the size of the overload heaters selected...Ch. 3 - What type of motor starter enclosure (include NEMA...Ch. 3 - Prob. 15SQCh. 3 - Prob. 16SQCh. 3 - Prob. 17SQCh. 3 - Prob. 18SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 20SQCh. 3 - Prob. 21SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 23SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 28SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 30SQCh. 3 - Prob. 31SQCh. 3 - What is the difference between a grounded control...Ch. 3 - A control transformer has a primary voltage of 480...
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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
- If the contacts on a manual starter cannot be closed immediately after a motor overload has tripped them open, what is the probable reason?arrow_forwardOne reason for the use of a reduced voltage starter would be to reduce the high starting current drawn by the motor. True or false?arrow_forwardIf the handle of an installed motor starter is in the center position, what condition does this indicate?arrow_forward
- What is the purpose of a starting relay? to start an electric motor to remove the starting winding or component from the circuit to protect the motor from starting overloads to prevent the motor from starting under heavy loadsarrow_forwardwhat must be done to prevent excessive motor current?arrow_forwardAt standstill condition, the back emf is zero, so the motor can be safely turned ON without a starter. Select one: O True O False?arrow_forward
- 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?arrow_forwardDoes the Indoor Fan Motor stop when the control fuses faulty?arrow_forwardIf a timing relay fails to cut in the run starter, what percentage of the full load current can the motor carry safely?arrow_forward
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