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Illumination

Illumination
Which lamps can be directly connected to a solar cell?

 Metal Halide
 LED
 Compact Fluorescent
 Incandescent

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Illumination
Luminous efficacy of a typical HPSV lamp is in between

 40 - 70 lm/watt.
 10 - 40 lm/watt
 70 - 120 lm/watt.
 120 - 200 lm/watt.

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Illumination
The range of visual spectrum is

 480nm - 760nm.
 300nm - 760nm.
 480nm - 1000nm.
 300nm - 1000nm.

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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√2 : 1
 1: 2√2
 2:1

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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
 Lambert’s cosine law.
 law of square inverse.
 both A and B.

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Illumination
Which lamp is best suited for lighting an International sports arena?

 LED
 Compact Fluorescent
 Metal Halide
 Incandescent

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