Illumination In illumination technology total lumens emitted by source / total lumens available after waste of light is equal to utilization factor. absorption factor. waste light factor. beam factor. utilization factor. absorption factor. waste light factor. beam factor. 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 1: 2√2 2√2 : 1 2:1 1:2 1: 2√2 2√2 : 1 ANSWER DOWNLOAD EXAMIANS APP
Illumination Solid angle is expressed in terms of radians. steredians. degree. radians / meter. radians. steredians. degree. radians / meter. ANSWER DOWNLOAD EXAMIANS APP
Illumination What is the work of a driver in case of an LED? To convert DC to AC To convert AC to DC None of these Both ‘a’ and ‘b’ To convert DC to AC To convert AC to DC None of these Both ‘a’ and ‘b’ 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 30 %. 45 %. 20 %. 70 %. 30 %. 45 %. 20 %. 70 %. ANSWER DOWNLOAD EXAMIANS APP
Illumination Which cells in the eye are responsible for scotopic vision? Rod cells Both ‘a’ and ‘b’ None of these Cone cells Rod cells Both ‘a’ and ‘b’ None of these Cone cells ANSWER DOWNLOAD EXAMIANS APP
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