Illumination Which lamp is best suited for lighting an International sports arena? Metal Halide Incandescent LED Compact Fluorescent Metal Halide Incandescent LED Compact Fluorescent 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 is the work of a driver in case of an LED? To convert AC to DC None of these Both ‘a’ and ‘b’ To convert DC to AC To convert AC to DC None of these Both ‘a’ and ‘b’ To convert DC to AC 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 2 5 6 4 2 5 6 ANSWER DOWNLOAD EXAMIANS APP
Illumination Which cells in the eye are responsible for scotopic vision? Rod cells None of these Cone cells Both ‘a’ and ‘b’ Rod cells None of these Cone cells Both ‘a’ and ‘b’ ANSWER DOWNLOAD EXAMIANS APP
Illumination Solid angle is expressed in terms of radians. degree. radians / meter. steredians. radians. degree. radians / meter. steredians. ANSWER DOWNLOAD EXAMIANS APP
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