A drawing hall 30 m by 15 m with a ceiling height of 5 m is to be provided with general illumination of 120 lux. Taking a coefficient of utilization of 0.5 and depreciation factor of 1.4, determine (a) the number of fluorescent tubes required, (b) their spacing, mounting height and (c) total wattage. Taking luminous efficiency of fluorescent tube as 40 lm/W for 80 W tubes. [(a) 48, 24 twin-tube units each tube of 80 W; (b) Row spacing of 5 m and unit and unit spacing of 3.75 m, (c) 3,840 W

A drawing hall 30 m by 15 m with a ceiling height of 5 m is to be provided with general illumination of 120 lux. Taking a coefficient of utilization of 0.5 and depreciation factor of 1.4, determine (a) the number of fluorescent tubes required, (b) their spacing, mounting height and (c) total wattage. Taking luminous efficiency of fluorescent tube as 40 lm/W for 80 W tubes. [(a) 48, 24 twin-tube units each tube of 80 W; (b) Row spacing of 5 m and unit and unit spacing of 3.75 m, (c) 3,840 W

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter1: Atomic Structure

Section: Chapter Questions

Problem 5RQ: How many valence electrons are generally contained in materials used for conductors?

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Concept explainers

Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.

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[(a) 48, 24 twin-tube units each tube of 80 W;

(b) Row spacing of 5 m and unit and unit spacing of 3.75 m, (c) 3,840 W]

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