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Illumination

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

 200.
  150.
  30
 140.

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Illumination
Luminous efficiency of a fluorescence lamp is

 60 lumens / watt.
 30 lumens / watt.
  70 lumens / watt.
  40 lumens / watt.

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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
Candela is the unit of which?

 Frequency.
 Luminous intensity.
 Wavelength.
 Luminous flux.

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Illumination
Illumination can be expressed in

  lumens.
  candela.
  lux.
  radians.

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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.
  Maintenance.
  Absorption factor.

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