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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

 140.
  30
 200.
  150.

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Illumination
Candela is the unit of which?

 Luminous flux.
 Frequency.
 Wavelength.
 Luminous intensity.

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Illumination
Which among the following lamps has the maximum burning hours?

 Compact Fluorescent.
 LED.
 Incandescent.
 Metal halide.

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

 Incandescent
 Metal Halide
 Compact Fluorescent
 LED

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Illumination
From a uniform light source having luminous intensity of 300 candelas, there exists a plane surface 15 m below. The value of illuminance at a point on the plane surface where the luminous flux rays are inclined at an angle of 30 to the surface is

 1.15 lux.
 58.45 Kilolux.
 17.32 lux.
 1.53 lux.

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Illumination
Luminous efficacy of a typical HPSV lamp is in between

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

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