Illumination Luminous efficacy of a typical HPSV lamp is in between 40 - 70 lm/watt. 10 - 40 lm/watt 70 - 120 lm/watt. 120 - 200 lm/watt. 40 - 70 lm/watt. 10 - 40 lm/watt 70 - 120 lm/watt. 120 - 200 lm/watt. ANSWER DOWNLOAD EXAMIANS APP
Illumination What is the ratio of illuminance at a point 5m just below a lamp emitting 100 candelas and at a point 5m away from the first point on the same horizontal plane? 2:1 1: 2√2 1:2 2√2 : 1 2:1 1: 2√2 1:2 2√2 : 1 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 %. 30 %. 20 %. 45 %. 70 %. 30 %. 20 %. 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? 2 6 5 4 2 6 5 4 ANSWER DOWNLOAD EXAMIANS APP
Illumination The range of visual spectrum is 300nm - 760nm. 480nm - 1000nm. 480nm - 760nm. 300nm - 1000nm. 300nm - 760nm. 480nm - 1000nm. 480nm - 760nm. 300nm - 1000nm. ANSWER DOWNLOAD EXAMIANS APP
Illumination Total flux or lumens required in any lighting scheme depends inversely on None of these reduction factor. reflection factor. utilization factor. None of these reduction factor. reflection factor. utilization factor. ANSWER DOWNLOAD EXAMIANS APP
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