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Posted Date: 07 May 2009 Posted By:: Sakthi Vel Shankar Member Level: Gold Points: 5 (Rs. 1)
2009 Anna University Chennai B.E. Electrical and Electronics Engineering EEE, Eighth Semester, EE 1451 – ELECTRIC ENERGY GENERATION, UTILISATION AND CONSERVATION, MAY/JUNE 2009. Question paper
B. E. / B. Tech. DEGREE EXAMINATION, MAY/JUNE 2009.
Electrical and Electronics Engineering
EE 1451 – ELECTRIC ENERGY GENERATION, UTILISATION AND CONSERVATION
(Common to B.E. (Part – Time) Seventh Semester Regulation 2005)
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A – (10 X 2 = 20 marks)
1. Give two examples of renewable energy sources.
2. What is minimum wind velocity required for power generation through wind mill?
3. State the few methods of improving the power factor in the industry.
4. What are the different types of tarrifs?
5. Define Illumination.
6. State the advantages of electric heating.
7. List two merits of series-parallel starting of traction motors.
8. What are the factors affecting specific energy consumption?
9. What is load equalization?
10. Give the merits and demerits of group drive.
PART B – (5 X 16 = 80 marks)]
11. (a) Describe briefly the generation of electrical power by conventional methods. [Marks 16]
(b) Describe with a neat sketch the working of a wind energy conversion system. [Marks 16]
12. (a) (i) Explain briefly about different energy auditing methods in use. [Marks 8]
(ii) Bring out the importance of energy conservation measures in electric energy consuming industry. [Marks 8]
(b) A Generating station has the following daily loads.
0 to 6 hrs 4000 kw
6 to 8 hrs 3000 kw
8 to 12 hrs 8000 kw
12 to 14 hrs 2000 kw
14 to 18 hrs 7500 kw
18 to 20 hrs 3000 kw
20 to 24 hrs 4500 kw
Sketch the load duration curve and determine the load factor assuming the capacity of the plant 11,000 kw [Marks 16]
13. (a) (i) With a neat diagram explain the working of a low pressure mercury vapour lamp. [Marks 8]
(ii) A lamp of 500 C.P. is hung at the centre of a room 8 x 6 m2 at a height of 3m from the floor. Calculate the maximum and minimum illumination produced and mention the places where it occurs. [Marks 8]
(b) A 30 Kw, 3 phase, 440 V resistance oven is to employ nichrome strip 0.025 cm thick for the three star connected heating elements. If the wire temperature is to be 1100oC and that of charge is to be 700oC. Estimate a suitable width for the strip. Assume resistivity as 1.016 x 10-6 ?m, emissivity 0.9 and radiating efficiency 0.5. [Marks 16]
14. (a) (i) Draw a typical speed-time curve and explain its salient features. [Marks 8]
(ii) An electric train is accelerated at 1.5 kmphps and is braked at 3 kmphps. The tarin has an average speed of 45 kmph on a level track of 1500 meters between stations. Determine the maximum speed and distance traveled before applying brakes. [Marks 8]
(b) A locomotive accelerates a 350 tonne train up a gradient of 1 in 100 at 0.8 kmphps. Assuming coefficient of adhesion to be 0.25 determine the minimum adhesive weight of the locomotive. Assume train resistance 44.5 Newtons/tonne and allow 10% for rotational inertia. [Marks 16]
15. (a) Disuss in detail the various factors governing the selection of a motor for a particular application. Explain with an example. [Marks 16]
(b) Discuss the modern methods of speed control of industrial drives. [Marks 16]
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