Luminous efficacy of a typical HPSV lamp is in between 40 - 70 lm/watt. 120 - 200 lm/watt. 10 - 40 lm/watt 70 - 120 lm/watt. TRUE ANSWER : ? YOUR ANSWER : ?
Which lamp has the best Colour Rendering Index (CRI)? High pressure sodium vapour LED Fluorescent Incandescent TRUE ANSWER : ? YOUR ANSWER : ?
Which lamps can be directly connected to a solar cell? LED Compact Fluorescent Incandescent Metal Halide 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√2 1:2 2:1 2√2 : 1 TRUE ANSWER : ? YOUR ANSWER : ?
Which lamp has a negative Colour Rendering Index (CRI)? High pressure sodium vapour Fluorescent LED Low pressure sodium vapour TRUE ANSWER : ? YOUR ANSWER : ?
Candela is the unit of which? Wavelength. Luminous flux. Frequency. Luminous intensity. TRUE ANSWER : ? YOUR ANSWER : ?
The range of visual spectrum is 480nm - 760nm. 300nm - 1000nm. 480nm - 1000nm. 300nm - 760nm. TRUE ANSWER : ? YOUR ANSWER : ?
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 58.45 Kilolux. 1.15 lux. 1.53 lux. 17.32 lux. TRUE ANSWER : ? YOUR ANSWER : ?
___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions. Absorption factor. Depreciation. Utilization. Maintenance. TRUE ANSWER : ? YOUR ANSWER : ?