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 15RQ
The local utility company must provide service to a small business.
The business is a wood working shop. What is the minimum standard size transformer that can be used to provide the following loads? The service is 240 volts single phase.
2—Table saws rated at 12 amperes each.
2—Drill presses rated at 4.5 amperes each.
2—Drill presses rated at 6.8 amperes each.
1—Air compressor rated at 24 amperes.
2—Commercial routing machines rated at 10.6 amperes each.
General lighting load rated at 4 kW.
Air conditioning load rated at 12 kW.
Gas heat with a blower motor rated at 10.2 amperes.
(Note: The smaller of the heating or air conditioning load may be omitted because both do not operate at the same time.)
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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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- What is a transformer?arrow_forwardQuestion 4 A 228 V/ 111 V single-phase transformer has a core loss of 110 W and the no-load current is 0.7 A. The no load power factor is Not yet answered Marked out of O 0.99 1.00 O 1.42 P Flag question O 0.48 O 0.69 Question 5 A 2 kV / 229 V transformer has the secondary turns of 47. The number of Primary turns of a transformer is given by, Not yet answered 63.83 Marked out of 410.48 1.00 O 615.72 P Flag question O 5381.50 Question 6 For the given power transfer, a delta system is associated with larger line currents and a star system is associated with a larger line voltage. Not yet answered Select one: Marked out of O True 1.00 P Flag question O Falsearrow_forwardWhat are the basic steps of transformer maintenance?arrow_forward
- A 10 kVA transformer has a primary voltage rating of 240 volts and a secondary voltage rating of 480 volts. The transformer is connected to a circuit protected by a 100 ampere circuit breaker. The secondary is protected by a 25-ampere fuse. Does the primary require separate overcurrent protection?arrow_forwardWhat are common efficiencies for transformers?arrow_forwardIf the core loss of single phase transformer at full load is 134 W, then the core loss at 50% of load is 8W 34W 134W 67Warrow_forward
- What is one special problem with dry-type transformers used in unit substations?arrow_forwardExplain the difference between a step-up and a step-down transformer.arrow_forwardEx: A single phase 50 KVA transformer has primary voltage of 6600 v and secondary voltage of 254 v and has 32 secondary turns. Calculate the number of primary turns and primary and secondary currents.arrow_forward
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