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Illumination

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

 Incandescent
 Compact Fluorescent
 LED
 Metal Halide

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

 LED
 Compact Fluorescent
 Incandescent
 Metal Halide

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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?

 2
 4
 5
 6

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Illumination
___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions.

  Maintenance.
  Utilization.
  Absorption factor.
  Depreciation.

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Illumination
Candela/metre square is the unit of which photometric quantity?

 Luminance
 Illuminance
 Luminous flux
 Luminous Intensity

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

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