Question 1. A road 300 m long is required to be illuminated by providing 40W fluorescent lamps. The width of the road is 4m. Design a street lighting scheme for obtaining minimum level of illumination of 0.6 lux assuming a mounting height of 9m and a 0.5 coefficient of utilization. (In designing you have to determine the distance between the poles and find out the number of poles required for the given distance.)

Question 2. A light assembly shop, 15m long, 9m wide and 3m up to trusses, is to be illuminated to a level of 200 lux. The utilization and maintenance factors are respectively 0.9 and 0.8. Make a scale drawing of the plan of the shop and set out the required lighting points, assuming the use of tungsten lamps and dispersive metallic reflectors. You may assume a lamp efficiency of 13 lm/W, and spacing height ratio of unity.

Question 3. A room measures 10mX20m and illuminated by 10 lamps of 700W each. It is illuminated semi-directly and the luminous efficiency of each lamp is 14lm/w. Allowing a depreciation factor of 1.7, determine the illumination of the working plane and guess the type of building considering the installation is correct.

Question 4. Given a 50m X 20m drawing room. It is required to illuminate semi-directly by 18W fluorescent lamps having an efficiency of 42 lm/W. Assuming a suitable space height ratio for new installation, estimate the no., rating and disposition of lamps if they to be mounted at 2.5m above the working bench.

Question 5. A hall 30m X 15m height is to be provided with a general illumination of 120lm/m2 Taking a coefficient of utilization of 0.5, depreciation factor 1.4 and appropriate space-height ratio, determine the no. of fluorescent tubes required, their spacing, mounting height and total wattage. Take luminous efficiency of fluorescent tubes as 40lm/W for 80 watt tube.

Question 6. A hall 15m by 20m is to be illuminated to a level of 70 lux. Luminaries having an efficiency of 12lm/w and spacing-height ratio 1.2 are to be suspended 4m above the flour. Estimate the no. of luminaries required and the power of each luminary. Assume a utilization factor of 0.5 and maintenance factor of 0.8. Also lay out the position of the luminaries.

Question 7. A room 7m by 10m is to be used as a general office and must be provided with illumination to a level of 4001x. 150w luminaries are to be installed giving a utilization factor of 0.5 and requiring a maintenance factor of 0.8. Assuming that the efficiency of luminaries is 13lm/w, calculate the no. of luminaries required.

Question 8. A road 300 m long is required to be illuminated by providing 40W fluorescent lamps.

The width of the road is 4m. Design a street lighting scheme for obtaining minimum level of illumination of 0.6 lux assuming a mounting height of 9m and a 0.5 coefficient of utilization.

(In designing you have to determine the distance between the poles and find out the number of poles required for the given distance.)