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ILLUMINATION QUIZ

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

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Which among the following lamps has the maximum burning hours?

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Wave length for red colour is around

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Solid angle is expressed in terms of

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Which lamp has the best Colour Rendering Index (CRI)?

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Luminous efficacy of a typical HPSV lamp is in between

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Illumination can be expressed in

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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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Which lamp has a negative Colour Rendering Index (CRI)?

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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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