23. A 20-kVA transformer has a maximum efficiency of 98 per cent when delivering three-fourth full load at u.p.f. If during the day, the transformer is loaded as follows: 12 hours No load !2 kW, 0.8 p.f. 20 kW, u.p.f. 6 hours 6 hours Calculate the energy efficiency of the transformer.

23. A 20-kVA transformer has a maximum efficiency of 98 per cent when delivering three-fourth full load at u.p.f. If during the day, the transformer is loaded as follows: 12 hours No load !2 kW, 0.8 p.f. 20 kW, u.p.f. 6 hours 6 hours Calculate the energy efficiency of the transformer.

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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Concept explainers

Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

Question

23. A 20-kVA transformer has a maximum efficiency of 98 per cent when delivering three-fourth full load
at u.p.f. If during the day, the transformer is loaded as follows:
12 hours
No load
!2 kW, 0.8 p.f.
20 kW, u.p.f.
6 hours
6 hours
Calculate the energy efficiency of the transformer.

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