Illumination The range of visual spectrum is 300nm - 760nm. 480nm - 760nm. 300nm - 1000nm. 480nm - 1000nm. 300nm - 760nm. 480nm - 760nm. 300nm - 1000nm. 480nm - 1000nm. ANSWER DOWNLOAD EXAMIANS APP
Illumination Candela/metre square is the unit of which photometric quantity? Luminance Luminous Intensity Luminous flux Illuminance Luminance Luminous Intensity Luminous flux Illuminance 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 A 1000 W bulb fitted with a reflector illuminates an area of 3 m x 3 m with an average illumination of 450 lux. If the bulb has and efficiency of 9 lumens / watt the efficiency of the reflector is 20 %. 70 %. 45 %. 30 %. 20 %. 70 %. 45 %. 30 %. ANSWER DOWNLOAD EXAMIANS APP
Illumination What will be the total flux emitted by a source of 60 candle power? 60 lumens. 0.001326 lumens. None of these. 754.2 lumens. 60 lumens. 0.001326 lumens. None of these. 754.2 lumens. ANSWER DOWNLOAD EXAMIANS APP
Illumination What will be the number of lamps, each having 300 lumens, required to obtain an average illuminance of 50 lux on a 4m × 3m rectangular room? 4 5 2 6 4 5 2 6 ANSWER DOWNLOAD EXAMIANS APP
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