What will be the total flux emitted by a source of 60 candle power? 60 lumens. 754.2 lumens. 0.001326 lumens. None of these. TRUE ANSWER : ? YOUR ANSWER : ?
Which lamp has the best Colour Rendering Index (CRI)? Incandescent Fluorescent LED High pressure sodium vapour TRUE ANSWER : ? YOUR ANSWER : ?
What is the work of a driver in case of an LED? Both ‘a’ and ‘b’ None of these To convert DC to AC To convert AC to DC TRUE ANSWER : ? YOUR ANSWER : ?
The work of ballast in a fluorescent tube is to both ‘a’ and ‘b’. None of these. limit the flow of current. provide a kick start when voltage is induced. TRUE ANSWER : ? YOUR ANSWER : ?
A 200 candle power lamp is hung 4 m above the centre of circular area of 5 m diameter. The illumination at centre of the area is 13.5 lux. 18.5 lux. 12.5 lux. 17.5 lux. TRUE ANSWER : ? YOUR ANSWER : ?
___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions. Maintenance. Absorption factor. Depreciation. Utilization. TRUE ANSWER : ? YOUR ANSWER : ?
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. None of these Lambert’s cosine law. law of square inverse. TRUE ANSWER : ? YOUR ANSWER : ?
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 1: 2√2 2√2 : 1 2:1 TRUE ANSWER : ? YOUR ANSWER : ?
Luminous efficiency of a fluorescence lamp is 60 lumens / watt. 40 lumens / watt. 70 lumens / watt. 30 lumens / watt. TRUE ANSWER : ? YOUR ANSWER : ?
Which lamp is best suited for lighting an International sports arena? Compact Fluorescent LED Metal Halide Incandescent TRUE ANSWER : ? YOUR ANSWER : ?