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A room 20 ft. by 30 ft. is illuminated by five 200 watt, 3700 lumen incandescent lamps. The average illumination intensity at the working plane as measured by a footcandle meter is 10 lumen per sq. ft.. Calculate the utilization factor of the lamps. a. 0.23 b. 0.56 c. 0.45 d. 0.23

A room 20 ft. by 30 ft. is illuminated by five 200 watt, 3700 lumen incandescent lamps. The average illumination intensity at the working plane as measured by a footcandle meter is 10 lumen per sq. ft.. Calculate the utilization factor of the lamps. a. 0.23 b. 0.56 c. 0.45 d. 0.23

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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Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A room 20 ft. by 30 ft. is illuminated by five 200 watt, 3700 lumen incandescent lamps. The average illumination intensity at the working plane as measured by a footcandle meter is 10 lumen per sq. ft.. Calculate the utilization factor of the lamps. a. 0.23 b. 0.56 c. 0.45 d. 0.23
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