DELMAR'S STANDARD TEXT OF ELECTRICITY
6th Edition
ISBN: 9780357323380
Author: Herman
Publisher: CENGAGE C
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Textbook Question
Chapter 28, Problem 4RQ
All values of a transformer are proportional to its __________________ ___________________.
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A transformer takes a current of 0.9 A and power absorbed 82 W, when its primary is connected to a 240V, 50Hz supply under secondary is open circuited. No load power factor cos ∅ is____________________________________.
(a) 0.379
(b) 0.74
(c) 0.2
(d) 0.9
Transformer values must be calculated using ___________ values of voltage and current.
The copper loss of a certain transformer at full-load is 220W. Then the copper loss at half full-load will be__________________.
copper loss at half load
Chapter 28 Solutions
DELMAR'S STANDARD TEXT OF ELECTRICITY
Ch. 28 - What is a transformer?Ch. 28 - What are common efficiencies for transformers?Ch. 28 - What is an isolation transformer?Ch. 28 - All values of a transformer are proportional to...Ch. 28 - What is an autotransformer?Ch. 28 - What is a disadvantage of an autotransformer?Ch. 28 - Explain the difference between a step-up and a...Ch. 28 - A transformer has a primary voltage of 240 V and a...Ch. 28 - A transformer has an output of 750 VA. The primary...Ch. 28 - A transformer has a turns ratio of 1:6. The...
Ch. 28 - What do the dots shown beside the terminal leads...Ch. 28 - A transformer has a primary voltage rating of 240...Ch. 28 - If the windings of the transformer in Question 12...Ch. 28 - The primary leads of a transformer are labeled 1...Ch. 28 - You are working in an industrial plant. You must...Ch. 28 - EP120VIPNP300TurnsRatioEs24IsNsZ=3Ch. 28 - EP240VIPNPRatioEs320VIsNs280Z=500Ch. 28 - EPIPNPRatio1:2.5Es160VIsNs80TurnsZ=12Ch. 28 - Prob. 4PPCh. 28 - Prob. 5PPCh. 28 - ES480VIPNS275turnsRatioESISNS525turnsZ=1.2kCh. 28 - ...Ch. 28 - ...
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- The transformer does not change the value of ______Group of answer choices voltage voltage and current frequency currentarrow_forwardThe short circuit test is used to measure the __________________________________ of the transformer. (a) Brush loss (b) Friction loss (c) Iron loss (d) Copper lossarrow_forwardIn a typical unit substation the majority of the connections to ground are made in the_. A. High- voltage section B. Transformer section C. low- voltage section D. None of the above.arrow_forward
- _________________________________ transformer is called isolation transformer. 1:1 Three phase core type Autoarrow_forwardWhat determines the amount of current on secondary si of a transformer? A- the secondary voltage, B- the resistance of the load, C-both a and b, D- none what determines the amount of current on the primary side of a transformer? A- the amount of secondary current, B- the turns ratio, C- both a and b, D-none when a coil induces a voltage into itself it is know as _______. A- self-induction, B-mutual induction, C- preliminar induction, D- nonearrow_forwardFill in the blanks The short circuit test of a transformer gives information of _______?arrow_forward
- Two different transformers details are tabulated below. Calculate the missed values in the table. Secondary terminal voltage of the second transformer is 487.5V when loaded. Determine the regulation of the transformer?arrow_forwardA 5-ohm load is connected to the secondary of a 1100/110-V power transformer. The effective load in the 1100 V bus bar is nearly ______ ohms.arrow_forwardQ13/ choose the correct answer A transformer with full load voltage of 223 volts, when the regulation is 4%. The no load voltage will be _____________________________ V. A- 227.46 B- 111.50 C- 231.92 D-148.67arrow_forward
- Refer to the National Electrical Code or the working drawings when necessary. Whereapplicable, responses should be written in complete sentences.A 300-kilovolt-ampere transformer bank consisting of three 100-kilovolt-amperetransformers has a 3-phase, 480-volt delta primary and a 120/240-volt, 3-phase, 4-wiredelta-connected secondary.For problems 1 through 4 show calculations and/or source of information 1. What is the full-load current in the primary? 2. What is the full-load current in the secondary?arrow_forwardRefer to the National Electrical Code or the working drawings when necessary. Whereapplicable, responses should be written in complete sentences.A 300-kilovolt-ampere transformer bank consisting of three 100-kilovolt-amperetransformers has a 3-phase, 480-volt delta primary and a 120/240-volt, 3-phase, 4-wiredelta-connected secondary.For problems 1 through 4 show calculations and/or source of information. 1. Sketch the secondary connections, and indicate where a 120-volt load couldbe connected.arrow_forwardRefer to the National Electrical Code or the working drawings when necessary. Whereapplicable, responses should be written in complete sentences.A 300-kilovolt-ampere transformer bank consisting of three 100-kilovolt-amperetransformers has a 3-phase, 480-volt delta primary and a 120/240-volt, 3-phase, 4-wiredelta-connected secondary.For problems 1 through 4 show calculations and/or source of information. 1. What is the proper rating of the fuses to install for overcurrent protection of thesecondary?2. What is the kilovolt-ampere of the bank if one of the transformers is removed?arrow_forward
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