A 100 watt, 230 volt gas filled lamp has a mean spherical candle power of 92. Find its efficiency in lumens per watt.
A9.56
B10.56
C11.56
D12.56
Electrical Engineering · Question Bank
Illumination
42 of 143 questions match · page 3 of 3. Answer in your head first, then check the solution.
A light source located 2.75 m from a surface produces an illumination of 528 lux on the surface. Find the illumination if the distance is changed to 1.55 m.
A298 lux
B1,662 lux
C937 lux
D168 lux
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