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Illumination

Illumination
Illumination can be expressed in

  lux.
  radians.
  candela.
  lumens.

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Illumination
The work of ballast in a fluorescent tube is to

 both ‘a’ and ‘b’.
 None of these.
 provide a kick start when voltage is induced.
 limit the flow of current.

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

 LED
 Incandescent
 Metal Halide
 Compact Fluorescent

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Illumination
What is the work of a driver in case of an LED?

 To convert AC to DC
 None of these
 Both ‘a’ and ‘b’
 To convert DC to AC

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

 140.
 200.
  30
  150.

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