A room of 20×15 m is illuminated by 60 W incandescent lamps of lumen output of 1600 lumens. The average illumination required at the workplace is 400 lux. Calculate the number of lamps required to be fitted in the room. Assume utilization and depreciation factors as 0.5 and 1 res pectively.

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter26: Three-phase Circuits
Section: Chapter Questions
Problem 3PA: You are an electrician working in an industrial plant. A 30-hp three-phase induction motor has a...
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A room of 20×15 m is illuminated by 60 W
incandescent lamps of lumen output of 1600
lumens. The average illumination required at the
workplace is 400 lux. Calculate the number of
lamps required to be fitted in the room. Assume
utilization and depreciation factors as 0.5 and 1 res
pectively.
Transcribed Image Text:A room of 20×15 m is illuminated by 60 W incandescent lamps of lumen output of 1600 lumens. The average illumination required at the workplace is 400 lux. Calculate the number of lamps required to be fitted in the room. Assume utilization and depreciation factors as 0.5 and 1 res pectively.
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