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Illumination

Illumination
Unit of luminous flux is

  lux.
  lumens.
  steradians.
  candela.

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Illumination
Luminous efficacy of a typical HPSV lamp is in between

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

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Illumination
A 200 candle power lamp is hung 4 m above the centre of circular area of 5 m diameter. The illumination at centre of the area is

  13.5 lux.
 18.5 lux.
 17.5 lux.
  12.5 lux.

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Illumination
Candela is the unit of which?

 Luminous intensity.
 Luminous flux.
 Wavelength.
 Frequency.

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

 Metal Halide
 Compact Fluorescent
 Incandescent
 LED

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Illumination
A 1000 W bulb fitted with a reflector illuminates an area of 3 m x 3 m with an average illumination of 450 lux. If the bulb has and efficiency of 9 lumens / watt the efficiency of the reflector is

 20 %.
  45 %.
  70 %.
 30 %.

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