Q4//a. A 600 KVA one phase transformer when working at unity p.f has anefficiency of 92% at full load and also at half full load. Determine its efficiency whenit operates at unity p.f and 60% of full load.b. The voltage in an alternating current circuit at any time t seconds is given byv=60 sin 40 t volts. Find the first time when the voltage is (i)50 v (ii)15 v

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Q4//a. A 600 KVA one phase transformer when working at unity p.f has an efficiency of 92% at full load and also at half full load. Determine its efficiency when it operates at unity p.f and 60% of full load.

Q4//a. A 600 KVA one phase transformer when working at unity p.f has an efficiency of 92% at full load and also at half full load. Determine its efficiency when it operates at unity p.f and 60% of full load.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

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Concept explainers

Distribution System

The final stage in the delivery of the electric power is the electric power distribution system. From the transmission system to the individual customers it carries electricity. The distribution system is connected with the transmission system and is used to lower the voltage of the transmission to medium voltage in the range of 2 kV to 35 kV with the help of transformers. This medium voltage to the distribution transformers located near the customer's premises is carried by the primary distribution system lines. These distribution transformers in turn lower the voltage to utilization voltage used in lightings, household appliances, industrial equipments etc. Through secondary distribution lines often several customers are supplied from one transformer. It is through service drops, the commercial and residential customers are connected to the secondary distribution system lines. Customers who demand a larger amount of power can be connected directly to the primary distribution system level or the sub-transmission level.

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Q4//a. A 600 KVA one phase transformer when working at unity p.f has an
efficiency of 92% at full load and also at half full load. Determine its efficiency when
it operates at unity p.f and 60% of full load.
b. The voltage in an alternating current circuit at any time t seconds is given by
v=60 sin 40 t volts. Find the first time when the voltage is (i)50 v (ii)15 v

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