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 %. 20 %. 70 %. 30 %. 45 %. 20 %. 70 %. 30 %. ANSWER DOWNLOAD EXAMIANS APP
Illumination What is the ratio of illuminance at a point 5m just below a lamp emitting 100 candelas and at a point 5m away from the first point on the same horizontal plane? 2:1 1: 2√2 1:2 2√2 : 1 2:1 1: 2√2 1:2 2√2 : 1 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 None of these law of square inverse. Lambert’s cosine law. both A and B. None of these law of square inverse. Lambert’s cosine law. both A and B. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which among the following lamps has the maximum burning hours? Incandescent. LED. Compact Fluorescent. Metal halide. Incandescent. LED. Compact Fluorescent. Metal halide. ANSWER DOWNLOAD EXAMIANS APP
Illumination Total flux or lumens required in any lighting scheme depends inversely on reflection factor. reduction factor. None of these utilization factor. reflection factor. reduction factor. None of these utilization factor. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which lamps can be directly connected to a solar cell? Compact Fluorescent Metal Halide LED Incandescent Compact Fluorescent Metal Halide LED Incandescent ANSWER DOWNLOAD EXAMIANS APP
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