SSC JE Electrical Engineering 2015 Paper

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Question : 144 of 199

Marks: +1, -0

A 200 V lamp takes a current of 1 A, it produces a total flux of 2860 lumens. The efficiency of the lamp is?

10.9 lumens/W
9.9 lumens/W
8.9 lumens/W
14.3 lumens/W

Solution:

\Efficiency ={\Total \flux \in \lumen}/{\Power \in \watt}

Power

= VI = 200 × 1 = 200

watt

2860/200=14.3

lumens/watt

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