Illumination Luminous efficacy of a typical HPSV lamp is in between 10 - 40 lm/watt 40 - 70 lm/watt. 70 - 120 lm/watt. 120 - 200 lm/watt. 10 - 40 lm/watt 40 - 70 lm/watt. 70 - 120 lm/watt. 120 - 200 lm/watt. ANSWER DOWNLOAD EXAMIANS APP
Illumination A 200 candle power lamp is hung 4 m above the centre of circular area of 5 m diameter. The illumination at centre of the area is 12.5 lux. 13.5 lux. 18.5 lux. 17.5 lux. 12.5 lux. 13.5 lux. 18.5 lux. 17.5 lux. ANSWER DOWNLOAD EXAMIANS APP
Illumination What will be the total flux emitted by a source of 60 candle power? 0.001326 lumens. None of these. 60 lumens. 754.2 lumens. 0.001326 lumens. None of these. 60 lumens. 754.2 lumens. ANSWER DOWNLOAD EXAMIANS APP
Illumination The work of ballast in a fluorescent tube is to provide a kick start when voltage is induced. limit the flow of current. both ‘a’ and ‘b’. None of these. provide a kick start when voltage is induced. limit the flow of current. both ‘a’ and ‘b’. None of these. ANSWER DOWNLOAD EXAMIANS APP
Illumination Candela is the unit of which? Luminous flux. Wavelength. Frequency. Luminous intensity. Luminous flux. Wavelength. Frequency. Luminous intensity. 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 6 5 4 2 6 5 ANSWER DOWNLOAD EXAMIANS APP
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