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 %. 30 %. 70 %. 20 %. 45 %. 30 %. 70 %. 20 %. 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. 18.5 lux. 17.5 lux. 13.5 lux. 12.5 lux. 18.5 lux. 17.5 lux. 13.5 lux. ANSWER DOWNLOAD EXAMIANS APP
Illumination ___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions. Maintenance. Absorption factor. Utilization. Depreciation. Maintenance. Absorption factor. Utilization. Depreciation. ANSWER DOWNLOAD EXAMIANS APP
Illumination The illumination at a point 5 meters below a lamp in 6 lux. The candle power of the lamp is 30 200. 140. 150. 30 200. 140. 150. 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 Lambert’s cosine law. both A and B. law of square inverse. None of these Lambert’s cosine law. both A and B. law of square inverse. None of these ANSWER DOWNLOAD EXAMIANS APP
Illumination Which cells in the eye are responsible for scotopic vision? None of these Both ‘a’ and ‘b’ Rod cells Cone cells None of these Both ‘a’ and ‘b’ Rod cells Cone cells ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS