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1. A 3KVA transformer has a core loss of 30 W and a full-load copper loss of 75W. Calculate the all-day efficiency for the following loads: 1-1/2 times the rated kVA, pf = 0.85, 2hrs; Rated kVA, pf = 0.9, 5hrs; ii. iii. 4 rated kVA, pf = 0.95, 6hrs; ½ rated kVA, pf = 1.0, 7 hrs; and No-load, 4hrs iv. V.

1. A 3KVA transformer has a core loss of 30 W and a full-load copper loss of 75W. Calculate the all-day efficiency for the following loads: 1-1/2 times the rated kVA, pf = 0.85, 2hrs; Rated kVA, pf = 0.9, 5hrs; ii. iii. 4 rated kVA, pf = 0.95, 6hrs; ½ rated kVA, pf = 1.0, 7 hrs; and No-load, 4hrs iv. V.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Electrical Apparatus and Devices
1. A 3KVA transformer has a core loss of 30 W and a full-load copper loss of 75W. Calculate the all-day efficiency for the following loads: 1-1/2 times the rated kVA, pf = 0.85, 2hrs; Rated kVA, pf = 0.9, 5hrs; iii. ii. ¾ rated kVA, pf = 0.95, 6hrs; ½ rated kVA, pf = 1.0, 7 hrs; and No-load, 4hrs iv. V.
Transcribed Image Text:1. A 3KVA transformer has a core loss of 30 W and a full-load copper loss of 75W. Calculate the all-day efficiency for the following loads: 1-1/2 times the rated kVA, pf = 0.85, 2hrs; Rated kVA, pf = 0.9, 5hrs; iii. ii. ¾ rated kVA, pf = 0.95, 6hrs; ½ rated kVA, pf = 1.0, 7 hrs; and No-load, 4hrs iv. V.
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