Illumination Luminous efficiency of a fluorescence lamp is 30 lumens / watt. 70 lumens / watt. 60 lumens / watt. 40 lumens / watt. 30 lumens / watt. 70 lumens / watt. 60 lumens / watt. 40 lumens / watt. ANSWER DOWNLOAD EXAMIANS APP
Illumination What is the work of a driver in case of an LED? Both ‘a’ and ‘b’ To convert AC to DC None of these To convert DC to AC Both ‘a’ and ‘b’ To convert AC to DC None of these 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 45 %. 70 %. 20 %. 30 %. 45 %. 70 %. 20 %. 30 %. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which among the following lamps has the maximum burning hours? Metal halide. Incandescent. Compact Fluorescent. LED. Metal halide. Incandescent. Compact Fluorescent. LED. ANSWER DOWNLOAD EXAMIANS APP
Illumination Candela is the unit of which? Wavelength. Frequency. Luminous flux. Luminous intensity. Wavelength. Frequency. Luminous flux. Luminous intensity. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which lamp has a negative Colour Rendering Index (CRI)? LED High pressure sodium vapour Fluorescent Low pressure sodium vapour LED High pressure sodium vapour Fluorescent Low pressure sodium vapour ANSWER DOWNLOAD EXAMIANS APP
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