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 30 %. 20 %. 70 %. 45 %. 30 %. 20 %. 70 %. 45 %. ANSWER DOWNLOAD EXAMIANS APP
Illumination Unit of luminous flux is steradians. lux. lumens. candela. steradians. lux. lumens. candela. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which cells in the eye are responsible for scotopic vision? Rod cells Cone cells Both ‘a’ and ‘b’ None of these Rod cells Cone cells Both ‘a’ and ‘b’ None of these ANSWER DOWNLOAD EXAMIANS APP
Illumination From a uniform light source having luminous intensity of 300 candelas, there exists a plane surface 15 m below. The value of illuminance at a point on the plane surface where the luminous flux rays are inclined at an angle of 30 to the surface is 1.53 lux. 1.15 lux. 17.32 lux. 58.45 Kilolux. 1.53 lux. 1.15 lux. 17.32 lux. 58.45 Kilolux. ANSWER DOWNLOAD EXAMIANS APP
Illumination Illumination can be expressed in lumens. radians. candela. lux. lumens. radians. candela. lux. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which among the following lamps has the maximum burning hours? Metal halide. LED. Incandescent. Compact Fluorescent. Metal halide. LED. Incandescent. Compact Fluorescent. ANSWER DOWNLOAD EXAMIANS APP
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