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03000EE366052007

What are polar curves? Explain Rousseau diagram and its importance in
illumination engineering.
Explain about the necessity of supplementary artificial lighting.
PART C
Answer any two full questions, each carries 10 marks.
An illumination on the working plane of 75 lux is required in a room 72m x 15

m in size. The lamps are required to be hung 4 m above the work bench.
Assuming space height ratio of 0.9, utilisation factor of 0.5, a lamp efficiency
of 14 lumens per watt and a candle power depreciation of 20 %, estimate the
number, rating and disposition of lamps.
Define the terms a) space — height ratio b) maintenance factor
Write the expression to find room index.
Explain lumen or flux method of calculation for interior lighting.
Explain about different types of street lighting luminaire.
Explain the two basic principles employed in street lighting?
What are the requirements of good street lighting?
PART D

Answer any two full questions, each carries 10 marks.
A building measuring 30m x 20m is to be floodlit on the front side with
brightness of 25 lumen per sq.m. Coefficient of reflection of building surface is
0.25. Lamps of 500 W having lumens output of 8000 each are used. Assuming
beam factor as 0.6, waste light factor be 1.2 and maintenance factor be 0.75,
find the number of lamps required.
What are the objectives of aesthetic lighting?
Explain five features of sports lighting.
Write short notes on a) waste light factor and b) beam factor.
Explain different methods available for aiming of lamp in flood lighting.

Explain the design considerations for auditorium lighting.

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