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Illumination

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

 Incandescent
 Metal Halide
 Compact Fluorescent
 LED

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Illumination
The work of ballast in a fluorescent tube is to

 None of these.
 provide a kick start when voltage is induced.
 limit the flow of current.
 both ‘a’ and ‘b’.

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Illumination
Wave length for red colour is around

 500 nm.
 700 nm.
 600 nm.
 400 nm.

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Illumination
Which lamp has a negative Colour Rendering Index (CRI)?

 Low pressure sodium vapour
 Fluorescent
 High pressure sodium vapour
 LED

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Illumination
Luminous efficacy of a typical HPSV lamp is in between

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

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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

 both A and B.
None of these
 law of square inverse.
 Lambert’s cosine law.

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