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16th National Certification Exam Energy Managers & Auditors SEPTEMBER 2015 Paper 4

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Paper 4 Set B REGULAR 16th NATIONAL CERTIFICATION EXAMINATION FOR ENERGY MANAGERS & ENERGY AUDITORS September, 2015 PAPER 4:Energy Performance Assessment for Equipment and Utility Systems Date: 20.09.2015 Timings: 14:00-16:00 HRS Duration: 2 HRS Max. Marks: 100 o Section - I: BRIEF QUESTIONS Marks: 10 x 1 = 10 (i) Answer all Ten questions (ii) Each question carries One mark S-1 Ans S-2 Ans S-3 Ans S-4 Ans The Net present value of a Energy Conservation Project is Rs.38784/- and the initial capital investment Rs 1,50,000/- calculate the Profitability Index of the project. PI = 38784 = 0.258 1,50,000 Between a natural gas fired boiler and oil fired boiler which will have a higher percentage of hydrogen loss in flue gas? Why? Gas fired boiler. Because the hydrogen percentage is more in natural gas compared to oil. If the condenser back pressure is 82 mm Hg, calculate the condenser vacuum if the atmospheric pressure is 755 mmHg. Condenser vacuum, mmHg = (Atmospheric pressure, mmHg - Condenser back pressure, mmHg) = (755 - 82) = 673 mmHg. For a process requiring indirect heating to 200 oC, thermic fluid is preferred to steam as a heat carrier. Why ? Because for steam to be heated to high temperatures, the pressure required will be very high. S-5 Ans After cleaning of choked AHU filter, AHU fan power increased. Why? Due to less resistance, the air flow increased. S-6 Ans S-7 Why is the exhaust temperature of furnace oil fired systems limited to about 170 0C? Acid dew point due to presence of sulphur Other than exhaust gas what is the major source of waste heat recovery in a water _______________________ Bureau of Energy Efficiency 1

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