Lumean Area Method 1. A room 100 ft x 300 ft requires 80 foot-candle. It is to be illuminated by duplex fluorescent lamp. The 2-T20 watt lamp has an output of 3200 lumens, maintenance factor is 0.7 and coefficient of utilization is 0.6. Calculate the number of luminaires. 2. A room 20 m by 10 m is to be illuminated by 10 lamps at an average illumination of 50 lux. If CU = 0.50 and MF = 0.83, the mean spherical candlepower of each lamp is nearest to…

Lumean Area Method 1. A room 100 ft x 300 ft requires 80 foot-candle. It is to be illuminated by duplex fluorescent lamp. The 2-T20 watt lamp has an output of 3200 lumens, maintenance factor is 0.7 and coefficient of utilization is 0.6. Calculate the number of luminaires. 2. A room 20 m by 10 m is to be illuminated by 10 lamps at an average illumination of 50 lux. If CU = 0.50 and MF = 0.83, the mean spherical candlepower of each lamp is nearest to…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter3: Static Electricity

Section: Chapter Questions

Problem 7RQ: A thundercloud has a negative charge, and an object on the ground has a positive charge. Will the...

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A thundercloud has a negative charge, and an object on the ground has a positive charge. Will the lightning discharge be from the cloud to the ground or from the ground to the cloud?
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The suitable lamps for street lighting are O a. Mercury vapour lamps O b. Sodium discharge lamps O c. Both (a) and (b) O d. Halogen lamp
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