EXAMIANS
Unit of luminous flux is
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The solid angle subtended by an area of 2400 cm2 on the surface of a sphere of diameter 1.2 m is
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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
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The illumination at a point 5 meters below a lamp in 6 lux. The candle power of the lamp is
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___________________________ factor is defined as the ratio of the illumination when everything is clean to illumination under normal working conditions.
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The work of ballast in a fluorescent tube is to
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Which lamps can be directly connected to a solar cell?
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What will be the total flux emitted by a source of 60 candle power?
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Which lamp has the best Colour Rendering Index (CRI)?
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Solid angle is expressed in terms of
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