A transformer has its maximum efficiency of 98% at 20kVA and unity power factor. During the day, it is loaded as under: 12 hours: 3kW at power factor 0.5 lagging. o nours: 11kW at power factor 0.8 lagging. 6 hours 48kWat power factor 0.9 lagging. Find the all-day efficiency.
A transformer has its maximum efficiency of 98% at 20kVA and unity power factor. During the day, it is loaded as under: 12 hours: 3kW at power factor 0.5 lagging. o nours: 11kW at power factor 0.8 lagging. 6 hours 48kWat power factor 0.9 lagging. Find the all-day efficiency.
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter2: Fundamentals
Section: Chapter Questions
Problem 2.16P: A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and...
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![transformer has its maximum efficiency of 98% at 20kVA and unity power factor. During the day, it
is loaded as under:
12 hours: 3kW at power factor 0.5 lagging.
o nours: 11kW at power factor 0.8 lagging.
6 hours 48kWat power factor 0.9 lagging.
Find the all-day efficiency.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0811803f-6a23-4c7a-b4cc-d4c4520bc78c%2F93ad22e2-4f2c-47e9-a0bd-edc0fa1308be%2Flvyt7b8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:transformer has its maximum efficiency of 98% at 20kVA and unity power factor. During the day, it
is loaded as under:
12 hours: 3kW at power factor 0.5 lagging.
o nours: 11kW at power factor 0.8 lagging.
6 hours 48kWat power factor 0.9 lagging.
Find the all-day efficiency.
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