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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

  30
  150.
 200.
 140.

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Illumination
Luminous efficiency of a fluorescence lamp is

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

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Illumination
Solid angle is expressed in terms of

 radians.
 degree.
 steredians.
 radians / meter.

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Illumination
What will be the number of lamps, each having 300 lumens, required to obtain an average illuminance of 50 lux on a 4m × 3m rectangular room?

 5
 4
 6
 2

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Illumination
The work of ballast in a fluorescent tube is to

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

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

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

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