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At relatively light loads, transformer efficiency is low because

At relatively light loads, transformer efficiency is low because

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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At relatively light loads, transformer efficiency is low because Cu loss is small Transformer losses are high Secondary output is low O Fixed loss is high in proportion to the output A short circuit test was performed upon a 10 x 10^3 VA, 2,300/230V transformer with the following results: Esc = 137 V, Psc = 192 W, Isc = 4.34 A. Calculate the percent regulation at a lagging power factor of O.707. * 5.55% 5.28% 5.37% 5.72% What is load at which maximum efficiency occurs in case of a 100 kVA transformer with iron loss of 1 kW and full-load copper loss of 2 kW? * 50.5 kVA O 100 kVA O 25.2 kVA 70.7 kVA
Transcribed Image Text:At relatively light loads, transformer efficiency is low because Cu loss is small Transformer losses are high Secondary output is low O Fixed loss is high in proportion to the output A short circuit test was performed upon a 10 x 10^3 VA, 2,300/230V transformer with the following results: Esc = 137 V, Psc = 192 W, Isc = 4.34 A. Calculate the percent regulation at a lagging power factor of O.707. * 5.55% 5.28% 5.37% 5.72% What is load at which maximum efficiency occurs in case of a 100 kVA transformer with iron loss of 1 kW and full-load copper loss of 2 kW? * 50.5 kVA O 100 kVA O 25.2 kVA 70.7 kVA
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