Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 4, Problem 2RQ
What are common efficiencies for transformers?
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In a given DC motor, the output power is 45 HP, and the copper losses are 2.005 KW.
If the rotational losses is one tenth of the output power,
find the converted power and the efficiency of the motor.
Select one:
O a. None
O b. Pcony = 33.57 KW and % efficiency = 89.2 %
%3D
O C. Pcony = 39 KW and % efficiency = 75.8 %
O d. Peony = 36.927 KW and % efficiency = 86.2 %.
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If the core loss of single phase transformer at full load is 134 W, then the core loss at 50% of load
is
8W
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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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