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Illumination

Illumination
Solid angle is expressed in terms of

 steredians.
 degree.
 radians / meter.
 radians.

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Illumination
Which lamp has the best Colour Rendering Index (CRI)?

 Fluorescent
 LED
 High pressure sodium vapour
 Incandescent

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

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

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Illumination
Luminous efficacy of a typical HPSV lamp is in between

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

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

 Illuminance
 Luminous Intensity
 Luminous flux
 Luminance

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Illumination
What will be the total flux emitted by a source of 60 candle power?

  None of these.
  754.2 lumens.
 60 lumens.
 0.001326 lumens.

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