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. None of these law of square inverse. both A and B. Lambert’s cosine law. None of these law of square inverse. 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 4 5 6 2 4 5 6 ANSWER DOWNLOAD EXAMIANS APP
Illumination Illumination can be expressed in lux. candela. radians. lumens. lux. candela. radians. lumens. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which lamps can be directly connected to a solar cell? Incandescent Compact Fluorescent Metal Halide LED Incandescent Compact Fluorescent Metal Halide LED 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. 58.45 Kilolux. 17.32 lux. 1.53 lux. 1.15 lux. 58.45 Kilolux. 17.32 lux. ANSWER DOWNLOAD EXAMIANS APP
Illumination The work of ballast in a fluorescent tube is to limit the flow of current. provide a kick start when voltage is induced. None of these. both ‘a’ and ‘b’. limit the flow of current. provide a kick start when voltage is induced. None of these. both ‘a’ and ‘b’. ANSWER DOWNLOAD EXAMIANS APP
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