engineering recuitment PGCIL Trainee Supervisor Electrical Mock Test 2024 Utilization of Electrical Energy Lamps and Bulbs
A lamp of 80 watt with efficiency of 80% of watt/CP is suspended, The illumination at a point on a working plane directly below the lamp is 25 lumens/m2. Determine the height at which the lamp is suspended?
1
4 meters
2
3.2 meters
3
2 meters
4
1.6 meters