engineering recuitment JSSC JE Mock Test 2023 Utilization of Electrical Energy Illumination

Which of the following statements correctly defines "Utilization factor" or "Co-efficient of Utilization"?

1
Lumens received on the working plane/Lumens emitted by the lamp
2
Lumens received on the working plane/Lux of the lamp
3
Lux of the lamp/Lumens received on the working plane
4
Lux of the lamp/Foot-candle on the working plane
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