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Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 11, Problem 3RQ
How are larger control transformers supplying a motor control center usually cooled?
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Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:
A. the heating effect of current alone
B. hysteresis loss alone
C. both the heating effect of current and hysteresis loss
D. intense sunlight at noon
Chapter 11 Solutions
Electrical Transformers and Rotating Machines
Ch. 11 - What are the three main sources of heat in a...Ch. 11 - What is one advantage of shell-type construction...Ch. 11 - How are larger control transformers supplying a...Ch. 11 - What is a way to increase cooling on a large...Ch. 11 - What is one special problem with dry-type...Ch. 11 - What are two types of cooling medium used in...Ch. 11 - Name two functions of transformer oil.Ch. 11 - What type of coolant/insulator is banned in the...Ch. 11 - Name two ways of increasing the cooling of...Ch. 11 - What hazard is involved in water-cooled...
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