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Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 27, 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 27 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 27 - What is a transformer?Ch. 27 - What are common efficiencies for transformers?Ch. 27 - What is an isolation transformer?Ch. 27 - All values of a transformer are proportional to...Ch. 27 - What is an autotransformer?Ch. 27 - What is a disadvantage of an autotransformer?Ch. 27 - Explain the difference between a step-up and a...Ch. 27 - A transformer has a primary voltage of 240 V and a...Ch. 27 - A transformer has an output of 750 VA. The primary...Ch. 27 - A transformer has a turns ratio of 1:6. The...
Ch. 27 - What do the dots shown beside the terminal leads...Ch. 27 - A transformer has a primary voltage rating of 240...Ch. 27 - If the windings of the transformer in Question 12...Ch. 27 - The primary leads of a transformer are labeled 1...Ch. 27 - You are working in an industrial plant. You must...Ch. 27 - You have been given a transformer to install on a...Ch. 27 - EP120VIPNP300TurnsRatioEs24IsNsZ=3Ch. 27 - EP240VIPNPRatioEs320VIsNs280Z=500Ch. 27 - EPIPNPRatio1:2.5Es160VIsNs80TurnsZ=12Ch. 27 - Prob. 4PPCh. 27 - Prob. 5PPCh. 27 - ES480VIPNS275turnsRatioESISNS525turnsZ=1.2kCh. 27 - ...Ch. 27 - ...
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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_forwardno handwritten, only typingarrow_forward
- In 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_forward
- Fill in the blanks The short circuit test of a transformer gives information of _______?arrow_forwardDETERMINE IF THE STATEMENT/IMAGE IS FOR : DELTA- DELTA or WYE- WYE (follow the writing and spelling as it is) Question: What is the connection of this transformer bank? Note: answer must be all caps with - in between XI | x2 | xoarrow_forwardPlease answer no.6 only Thank you.arrow_forward
- A 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_forwardQ2) Identify type of Transformer referred to K>1 is__________ a. isolation b. Voltage transformer c. Step up d. Step downarrow_forward
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TRANSFORMERS - What They Are, How They Work, How Electricians Size Them; Author: Electrician U;https://www.youtube.com/watch?v=tXPy4OE7ApE;License: Standard Youtube License