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Illumination
Illumination
The work of ballast in a fluorescent tube is to
None of these.
both ‘a’ and ‘b’.
provide a kick start when voltage is induced.
limit the flow of current.
None of these.
both ‘a’ and ‘b’.
provide a kick start when voltage is induced.
limit the flow of current.
Answer
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Illumination
___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions.
Maintenance.
Absorption factor.
Depreciation.
Utilization.
Maintenance.
Absorption factor.
Depreciation.
Utilization.
Answer
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Illumination
The illumination of the surface varies directly with cosine of the angle between normal to surface and direction of the inclined light is given by
both A and B.
Lambert’s cosine law.
law of square inverse.
None of these
both A and B.
Lambert’s cosine law.
law of square inverse.
None of these
Answer
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Illumination
Luminous efficiency of a fluorescence lamp is
30 lumens / watt.
60 lumens / watt.
70 lumens / watt.
40 lumens / watt.
30 lumens / watt.
60 lumens / watt.
70 lumens / watt.
40 lumens / watt.
Answer
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Illumination
Unit of luminous flux is
steradians.
lux.
lumens.
candela.
steradians.
lux.
lumens.
candela.
Answer
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