Question 1                                                                                           (20 marks)

  • Compare between the mecury vapour lamp and sodium vapour lamp?
  • Discus the drawbacks of gaseous discharge lamps?
  • Design a suitable lighting scheme for a factory 120 m × 40 m with a height of

7 m. Illumination required is 60 lux. State the number, location and mounting height of 40 W fluorescent tubes giving 45 lm/W.

Depreciation factor = 1.2 ; utilization factor = 0.5.

 

Question 2                                                                                            (20 marks)

  • Classify the light sources? What are the advantages of incandescent lamps?
  • Mention the methods of lighting calculations? What are the types of lighting schemes?.
  • A drawing hall 30m x 15 m with ceiling height of 5 m

 

Question 3                                                                                            (20 marks)

  • .
  • A high-pressure mercury-vapour lamp is mounted at a height of 6 m in the middle of a large road crossing. A special reflector directs 100 C.P. maximum in a cone of 70º to the vertical line. Calculate the intensity of illumination on the road surface due to this beam of 100 C.P.

 

Question 4                                                                                            (20 marks)

  • What are the considerations should be taken in street lighting?
  1. Explain the importance of earthing systems in electrical installations?
  2. Explain the important specifications should be in installation boards?

 

Question 6                                                                                            (10 marks)

  1. Sketch the connection diagram for lighting two lamps from two different places?.