52119-mt----energy, Auditing, Conservation & Management

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Code No: 52119/MT M.Tech. – I Semester Supplementary Examinations, September, 2008 ENERGY, AUDITING, CONSERVATION & MANAGEMENT (Electrical Power Systems) Time: 3hours

1.a) b) 2.a) b) 3.a) b)

4.a) b) 5.a) b)

Max. Marks:60

Answer any FIVE questions All questions carry equal marks --Explain the terms of energy index, cost index, pie charts, sankey diagrams and load profiles with suitable examples. What are energy conservation schemes? Explain the importance of energy management programmes in industries to improve the energy utilization. Explain about check list for top management. Explain the constructional features of Energy efficient motors with the help of analyzing the loss distributions in standard motors. A 40 HP motor is having the following duty cycle 40 HP – 15 minutes 20 HP – 20 minutes 10 HP – 5 minutes stop – 5 minutes. Is this motor is efficient for its operation? Discuss the recommendations. Explain the location of capacitors for the improvement of power factor. Explain the effects of harmonics on power factor. Explain the working of following instruments (i) Pyrometer (ii) Tongue Testers (iii) Data logger If a motor has an initial cost of Rs. 10000/- and its scrap value at the end of 7 years is Rs. 2000/-. Determine the book value at the end of each year by sum of years digits methods.

6.a)

Write short notes on: (i) Sample pay back method (ii) Net present worth method. b) A 40 hp motor having an efficiency of 92% is replaced with an energy efficient motor of same rating of efficiency 94.5%. If the motor works for 400hrs at power cost of Rs.0.05/Kwh find the pay back period if old motor costs Rs. 70000/-, new motor cost is Contd….2

Code No: 52119/MT

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Rs.10000/-. Find the saving by net present worth method over a period of 10 years if rate of return is 10%, power rate increase 8% and tax rate is 40%. 7.a) Explain the economic analysis and depreciation methods in Energy Auditing. b) Discuss the applications of programmable Logic controllers. 8.a) b)

Explain about energy audit of process industry and buildings. Discuss lighting energy audit. &_&_&_&