engineering recuitment NMDC Junior Officer (Trainee) Mock Test 2024 Utilization of Electrical Energy Illumination
It is required to provide an illumination of 100 lux in a factory hall of 30 m length and 15 m breadth. Assume the maintenance factor is 0.8, coefficient of utilisation is 0.4 and efficiency of lamp is 14 lumen / watt. Suggest the number of lamps required when rating of the lamp is 250 W.
1
100
2
40
3
20
4
80