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 %. 20 %. 70 %. 30 %. 45 %. 20 %. 70 %. 30 %. ANSWER DOWNLOAD EXAMIANS APP
Illumination The work of ballast in a fluorescent tube is to both ‘a’ and ‘b’. provide a kick start when voltage is induced. None of these. limit the flow of current. both ‘a’ and ‘b’. provide a kick start when voltage is induced. None of these. limit the flow of current. ANSWER DOWNLOAD EXAMIANS APP
Illumination Candela/metre square is the unit of which photometric quantity? Luminous flux Illuminance Luminance Luminous Intensity Luminous flux Illuminance Luminance Luminous Intensity ANSWER DOWNLOAD EXAMIANS APP
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. 1 / 3. 3 / 2. 2 / 3. 2 / 5. 1 / 3. 3 / 2. ANSWER DOWNLOAD EXAMIANS APP
Illumination In illumination technology total lumens emitted by source / total lumens available after waste of light is equal to waste light factor. beam factor. absorption factor. utilization factor. waste light factor. beam factor. absorption factor. utilization factor. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which lamps can be directly connected to a solar cell? LED Compact Fluorescent Incandescent Metal Halide LED Compact Fluorescent Incandescent Metal Halide ANSWER DOWNLOAD EXAMIANS APP
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