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Illumination

Illumination
Unit of luminous flux is

  lux.
  steradians.
  lumens.
  candela.

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Illumination
Luminous efficacy of a typical HPSV lamp is in between

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

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

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

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Illumination
Which cells in the eye are responsible for scotopic vision?

 Both ‘a’ and ‘b’
 Cone cells
 None of these
 Rod cells

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

  Utilization.
  Depreciation.
  Absorption factor.
  Maintenance.

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Illumination
The illumination at a point 5 meters below a lamp in 6 lux. The candle power of the lamp is

 200.
 140.
  150.
  30

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MORE MCQ ON Illumination

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