Illumination The solid angle subtended by an area of 2400 cm2 on the surface of a sphere of diameter 1.2 m is 2 / 3. 2 / 5. 3 / 2. 1 / 3. 2 / 3. 2 / 5. 3 / 2. 1 / 3. ANSWER DOWNLOAD EXAMIANS APP
Illumination Wave length for red colour is around 700 nm. 500 nm. 400 nm. 600 nm. 700 nm. 500 nm. 400 nm. 600 nm. ANSWER DOWNLOAD EXAMIANS APP
Illumination In illumination technology total lumens emitted by source / total lumens available after waste of light is equal to utilization factor. beam factor. waste light factor. absorption factor. utilization factor. beam factor. waste light factor. absorption factor. ANSWER DOWNLOAD EXAMIANS APP
Illumination What is the work of a driver in case of an LED? None of these To convert AC to DC Both ‘a’ and ‘b’ To convert DC to AC None of these To convert AC to DC Both ‘a’ and ‘b’ To convert DC to AC ANSWER DOWNLOAD EXAMIANS APP
Illumination Which lamp has the best Colour Rendering Index (CRI)? LED Incandescent High pressure sodium vapour Fluorescent LED Incandescent High pressure sodium vapour Fluorescent ANSWER DOWNLOAD EXAMIANS APP
Illumination Candela/metre square is the unit of which photometric quantity? Luminous Intensity Luminance Illuminance Luminous flux Luminous Intensity Luminance Illuminance Luminous flux ANSWER DOWNLOAD EXAMIANS APP
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