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Energy Management (April 2010)

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Total No. of Questions : 12] P1630 [Total No. of Pages : 3 [3764]-146 B.E. (Mechanical Engineering) ENERGY MANAGEMENT (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer any three questions from each section. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of electronic pocket calculator is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) Write an essay on contemporary energy crises and role of conventional and non-conventional energy sources in it? [6] b) Write a note on Conventional fuels and their impact on human beings and environment . [6] c) What is Energy Management and what are its objectives? [6] OR Q2) a) Explain the Energy consumption patterns in Global and Indian industry, agriculture, commercial and residential sectors? [6] b) Explain energy conservation in production of heat for power generation. [6] c) Explain the difference between energy conservation and energy efficiency and state one example where energy costs are reduced but energy consumption goes up. [6] Q3) a) Briefly describe the instruments used for energy auditing. [8] b) An investment of Rs. 1 lakh is made for a variable speed drive at the beginning of the year, which is also the date of first operation. Savings expected over 4 years are Rs. 10,000, Rs. 20,000, Rs. 30,000 and Rs. 35,000 respectively. Find out the Net Present Value at the end of the 4th year, if the discount rate is 18%. Would you invest in this measure? Explain your decision. [8] P.T.O. OR Q4) a) Explain building system energy audit. [4] b) Illustrate Billing audit, Field audit and Micro audit. [6] c) Explain the following (Any three) : i) Simple payback period. ii) Time value of money. iii) Return on Investment. iv) Internal Rate of Return. [6] Q5) a) What is a steam trap? What are the types of steam trap? Explain the criteria of sizing and selection of steam trap. [8] b) How to determine the cost of steam, compressed air and electricity? Explain with examples. [8] OR Q6) a) List the energy conservation measures which are cost effective in various boilers and fired systems. [6] b) What is excess air? How to determine excess air if oxygen/carbon dioxide [6] percentage is measured in the flue gas? c) Explain the difference between efficiency and evaporation ratio with respect to boiler performance evaluation. [4] SECTION - II Q7) a) State briefly the criteria of selection of refractories. [6] b) What are the benefits of insulation other than heat loss/heat gain? And give examples of materials for high temperature insulations. [6] c) Name the three classifications of refractories on the basis of chemical composition. [6] OR Q8) a) What are the different demand side management techniques? [6] b) Discuss in detail the various energy conservation methods as applied to motors. [6] c) Explain why centrifugal machines offers the greatest savings when used with Variable Speed Drives. [6] [3764]-146 2 Q9) a) What is cogeneration? What are its benefits? Discuss in short various cogeneration techniques. [6] b) What is heat to power ratio and state its importance. [4] c) List out important factors to be considered for cogeneration plant performance. [6] OR Q10) a) Explain the waste heat recovery system and recycling procedures. [6] b) Explain the operating principle of a waste heat recovery boiler with examples. [6] c) List the circumstances under which cogeneration will become attractive.[4] Q11) a) A reciprocating V belt driven compressor was found to operating during normal factory operation with the following parameters : Load pressure = 6 bar. Unload pressure = 8 bar. Load time = 3 minutes. Unload time = 1.5 minutes. Suggest possible energy saving opportunities on a short-term basis. [8] b) List down energy conservation opportunities in pump and fan. [8] OR Q12) a) What are the energy conservation opportunities in a thermal power plant? [8] b) What are the various energy conservation measures as applied to refrigerators and air conditioners? [8] [3764]-146 3

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Additional Info : 2003 Course
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