railway RRB JE (CBT I + CBT II) Mock Test 2024 Utilization of Electrical Energy Illumination

A room of 12 m length and 10 m breadth is lighted by 15 lamps a fairly uniform illumination of 100 lm/m2. Calculate the utilisation coefficient the room given that the output of each lamp is 1600 lumens.

1
50%
2
60%
3
90%
4
80%
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