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primary resistor starter

primary resistor starter

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Please help me answer these questions in the photo attachments.

13. What is meant by the low or poor starting economy of a primary resistor starter?
Transcribed Image Text:13. What is meant by the low or poor starting economy of a primary resistor starter?
14. Why is it desirable to remove the auto transformers from the line when the motor reaches its rated speed? 15. What is one advantage of using an autotransformer started? 16. What voltage may be applied to 230/460- volt motor if used with a part winding? Why? 17. When starting on one winding, a motor draws approximately what percentage of the normal locked rotor current? 18. What is the principal reason for using star-delta motor? 19. If a delta-connected, six-lead motor nameplate reads 'Full Load Current 162 Amperes' on what current rating should the overload relay setting, or the selection of the heater elements be based? 20. Refer to the circuit shown in Figure 28-3. If it is assumed that the TR is set to a delay of 4 seconds. When the start button is pressed, the motor does not start. Holding the start button down for over 4 seconds does not cause the motor to start. Which of the following could not have caused this problem? a. Contractor coil S is open. b. The control transformer fuse is blown. c. OL-S contact is open. d. OL-R contact is open. 430 231052.jpg 20210430 231039.jpg Show all
Transcribed Image Text:14. Why is it desirable to remove the auto transformers from the line when the motor reaches its rated speed? 15. What is one advantage of using an autotransformer started? 16. What voltage may be applied to 230/460- volt motor if used with a part winding? Why? 17. When starting on one winding, a motor draws approximately what percentage of the normal locked rotor current? 18. What is the principal reason for using star-delta motor? 19. If a delta-connected, six-lead motor nameplate reads 'Full Load Current 162 Amperes' on what current rating should the overload relay setting, or the selection of the heater elements be based? 20. Refer to the circuit shown in Figure 28-3. If it is assumed that the TR is set to a delay of 4 seconds. When the start button is pressed, the motor does not start. Holding the start button down for over 4 seconds does not cause the motor to start. Which of the following could not have caused this problem? a. Contractor coil S is open. b. The control transformer fuse is blown. c. OL-S contact is open. d. OL-R contact is open. 430 231052.jpg 20210430 231039.jpg Show all
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