ILLUMINATION QUIZ

Which cells in the eye are responsible for scotopic vision?

Both ‘a’ and ‘b’

None of these

Rod cells

Cone cells

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Candela is the unit of which?

Luminous flux.

Luminous intensity.

Wavelength.

Frequency.

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In illumination technology total lumens emitted by source / total lumens available after waste of light is equal to

beam factor.

waste light factor.

utilization factor.

absorption factor.

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Unit of luminous flux is

lux.

candela.

steradians.

lumens.

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

Both ‘a’ and ‘b’

To convert DC to AC

None of these

To convert AC to DC

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

140.

30

200.

150.

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Wave length for red colour is around

600 nm.

500 nm.

700 nm.

400 nm.

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The range of visual spectrum is

480nm - 1000nm.

300nm - 1000nm.

480nm - 760nm.

300nm - 760nm.

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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?

4

2

6

5

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

Fluorescent

LED

High pressure sodium vapour

Incandescent

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