Illumination Luminous efficacy of a typical HPSV lamp is in between 10 - 40 lm/watt 70 - 120 lm/watt. 40 - 70 lm/watt. 120 - 200 lm/watt. 10 - 40 lm/watt 70 - 120 lm/watt. 40 - 70 lm/watt. 120 - 200 lm/watt. ANSWER DOWNLOAD EXAMIANS APP
Illumination Candela/metre square is the unit of which photometric quantity? Luminance Luminous Intensity Illuminance Luminous flux Luminance Luminous Intensity Illuminance Luminous flux ANSWER DOWNLOAD EXAMIANS APP
Illumination The illumination of the surface varies directly with cosine of the angle between normal to surface and direction of the inclined light is given by both A and B. Lambert’s cosine law. law of square inverse. None of these both A and B. Lambert’s cosine law. law of square inverse. None of these 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 / 5. 1 / 3. 2 / 3. 3 / 2. 2 / 5. 1 / 3. 2 / 3. 3 / 2. 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? 5 4 6 2 5 4 6 2 ANSWER DOWNLOAD EXAMIANS APP
Illumination What is the work of a driver in case of an LED? Both ‘a’ and ‘b’ None of these To convert DC to AC To convert AC to DC Both ‘a’ and ‘b’ None of these To convert DC to AC To convert AC to DC ANSWER DOWNLOAD EXAMIANS APP
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