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2003 Course Illumination Eng.

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Total No. of Questions : 12] [Total No. of Pages : 3 [3664] - 184 P 1373 B.E. (Electrical) ILLUMINATION ENGINEERING (2003 Course) (403143) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section I and 3 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) b) c) State and explain the laws of illumination. [6] What is photometer ? Explain Bench photometer with a neat sketch. [6] If a lamp of 250 C.P. is placed one meter below a plane mirror which reflects 95% of the light falling on it, determine the illumination at a point three meter away from the foot of the lamp which is suspended at a height of 4 meters above ground. [6] OR Q2) a) b) c) Q3) a) b) c) Define the following terms : i) M.H.C.P. ii) M.S.C.P. iii) Luminous intensity. iv) Illumination. v) Efficucy. vi) Reflection factor. What are the various methods of controlling natural light? Enlist the properties of light. [6] Write short note on High pressure sodium vapour lamp. What is stroboscopic effect? How it can be avoided? Write short note on LASER. [6] [6] [6] [6] [6] OR P.T.O. Q4) Explain any three with sketch : a) SOX Lamp. b) C.F.L. c) Metal Halide Lamps. d) L.E.D s. Q5) a) b) [18] Explain with neat sketch the starting ballast for [8] i) Sodium vapour lamp. ii) Mercury vapour lamp. Define and explain Snell s law of specular reflection. Also explain mixed & diffused reflection with sketches. [6] OR Q6) a) b) Discuss the various types of lighting fillings according to the level of luminous flux. [6] Enlist the material used for reflectors and explain each in brief. [8] SECTION - II Q7) a) b) What is polar curve? Describe it s type. How it is helpfull an illumination engineer. [8] Explain C.O.U. (Coefficient of utilization) in lighting scheme design with example. [8] OR Q8) a) b) Discuss the factors of good lighting design in detail. Write short note on : i) Street lighting. ii) Flood lighting. Q9) a) What is energy efficient lighting? Discuss its advantages & difficulties. [8] Give the comparison between different types of light sources with reference to their lumens per watt and life. [8] b) [8] [8] OR Q10)a) The front of building 60 m x 15 m is to be illuminated by flood lighting situated 25 m away. If illumination is 100 lux, C.O.U is 0.5, depreciation factor 1.5, waste light factor 1.2 estimate number & size of projectors. Sketch layout. [8] [3664] - 184 -2- b) Q11)a) b) c) Explain the term with example : i) Life cycle costing. ii) Payback calculation. [8] Define Day light factor. Discuss the components of daylight factor, with neat sketches. [6] Explain the concept of cold lighting. [6] Write short note on photovoltaic lighting. [6] OR Q12)a) b) Explain Emergency Lighting scheme with neat block diagram. In case of i) Central System. ii) Stand alone system. [10] Write short note on : [8] i) Switching control for light. ii) O.F.C. [3664] - 184 -3-

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