Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 4, Problem 1RQ
What is a transformer?
Expert Solution & Answer
To determine
The definition of transformer.
Explanation of Solution
The transformer is a magnetically operated electrical machine which changes the values of current, voltage or impedance without a change in the frequency of the supply. It works on the principle of magnetic induction. The transformer consists of two windings, first one is primary and second one is secondary winding. The primary winding carries the input supply and secondary winding carries the output supply.
The load is connected to secondary winding of the transformer. The change in input voltage or current depends on the number of turns in the primary winding and number of turns of wire in the secondary winding. If a transformer raises the value of the input current or voltage, then it is called a step up transformer and if it decreases the input voltage or current then the transformer is called a step down transformer. The input supply of transformer is always an AC supply.
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Form of the second question
3
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Chapter 4 Solutions
Electrical Transformers and Rotating Machines
Ch. 4 - What is a transformer?Ch. 4 - What are common efficiencies for transformers?
Ch. 4 - What is an isolation transformer?Ch. 4 - All values of a transformer are proportional to...Ch. 4 - A transformer has a primary voltage of 480 volts...Ch. 4 - If the secondary of the transformer in question 5...Ch. 4 - Explain the difference between a step-up and a...Ch. 4 - A transformer has a primary voltage of 240 volts...Ch. 4 - A transformer has an output of 750 VA. The primary...Ch. 4 - A transformer has a turns ratio of 1:6. The...
Ch. 4 - Prob. 11RQCh. 4 - Prob. 12RQCh. 4 - Prob. 13RQCh. 4 - The primary leads of a transformer are labeled 1...Ch. 4 - The local utility company must provide service to...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Prob. 7PCh. 4 - Prob. 8P
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