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Illumination

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

 LED
 Incandescent
 Compact Fluorescent
 Metal Halide

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

 Metal Halide
 Compact Fluorescent
 LED
 Incandescent

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

 High pressure sodium vapour
 Fluorescent
 Low pressure sodium vapour
 LED

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Illumination
Illumination can be expressed in

  candela.
  lux.
  radians.
  lumens.

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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?

 2√2 : 1
 2:1
 1: 2√2
 1:2

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Illumination
In illumination technology total lumens emitted by source / total lumens available after waste of light is equal to

  absorption factor.
  beam factor.
  waste light factor.
  utilization factor.

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