Illumination Which cells in the eye are responsible for scotopic vision? Both ‘a’ and ‘b’ Cone cells None of these Rod cells Both ‘a’ and ‘b’ Cone cells None of these Rod cells 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? 1:2 2:1 1: 2√2 2√2 : 1 1:2 2:1 1: 2√2 2√2 : 1 ANSWER DOWNLOAD EXAMIANS APP
Illumination The work of ballast in a fluorescent tube is to None of these. limit the flow of current. provide a kick start when voltage is induced. both ‘a’ and ‘b’. None of these. limit the flow of current. provide a kick start when voltage is induced. both ‘a’ and ‘b’. 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? 6 2 5 4 6 2 5 4 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 Both ‘a’ and ‘b’ None of these To convert DC to AC To convert AC to DC Both ‘a’ and ‘b’ None of these ANSWER DOWNLOAD EXAMIANS APP
Illumination Luminous efficacy of a typical HPSV lamp is in between 40 - 70 lm/watt. 70 - 120 lm/watt. 10 - 40 lm/watt 120 - 200 lm/watt. 40 - 70 lm/watt. 70 - 120 lm/watt. 10 - 40 lm/watt 120 - 200 lm/watt. ANSWER DOWNLOAD EXAMIANS APP
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