Illumination Which lamp has the best Colour Rendering Index (CRI)? High pressure sodium vapour LED Incandescent Fluorescent High pressure sodium vapour LED Incandescent Fluorescent 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 70 %. 45 %. 30 %. 20 %. 70 %. 45 %. 30 %. 20 %. ANSWER DOWNLOAD EXAMIANS APP
Illumination What will be the total flux emitted by a source of 60 candle power? None of these. 60 lumens. 754.2 lumens. 0.001326 lumens. None of these. 60 lumens. 754.2 lumens. 0.001326 lumens. 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 1.15 lux. 1.53 lux. 58.45 Kilolux. 17.32 lux. 1.15 lux. 1.53 lux. 58.45 Kilolux. 17.32 lux. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which cells in the eye are responsible for scotopic vision? Both ‘a’ and ‘b’ None of these Cone cells Rod cells Both ‘a’ and ‘b’ None of these Cone cells Rod cells ANSWER DOWNLOAD EXAMIANS APP
Illumination Unit of luminous flux is candela. lumens. lux. steradians. candela. lumens. lux. steradians. ANSWER DOWNLOAD EXAMIANS APP
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