SSC JE Electrical Engineering 2011 Paper

Question : 131 of 150

Marks: +1, -0

In designing lighting scheme, utilization factor is used. It is defined as

utilization factor = ${\total \lumensutilized \on \working \plane}/{\total \Iumens \radiated \by \lamp}$
utilization factor = ${\total \lumensutilized \on \working \plane}/{\illumination \when \everything \isclean}$
utilization factor = ${\illumination \under \normal \working \condition}/{\illumination \when \everything \isclean}$
utilization factor = ${\total \lumens \radiated \by \lamp}/{\total \lumensutilized \on \working \plane}$

Solution:

utilization factor =

{\total \lumensutilized \on \working \plane}/{\total \Iumens \radiated \by \lamp}

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