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20th National Certification Exam Energy Managers & Auditors SEPTEMBER 2019 Paper 4

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Paper 4 Code: Pink 20th NATIONAL CERTIFICATION EXAMINATION FOR ENERGY MANAGERS & ENERGY AUDITORS - September, 2019 PAPER 4: ENERGY PERFORMANCE ASSESSMENT FOR EQUIPMENT AND UTILITY SYSTEMS Section - I: BRIEF QUESTIONS Marks: 10 x 1 = 10 (i) Answer all Ten questions (ii) Each question carries ONE mark 1. The unit of Specific humidity is kg moisture / kg dry air. True 2. In a water Lithium bromide refrigeration system, the concentration of the lithium bromide is increased, in the evaporator. False 3. For the same no of poles and kW rating, the rpm of an energy efficient motor is higher that of a standard motor. True 4. The atmospheric pressure of 1 kg/cm2 (a) is 76 mm of mercury column. False 5. The capacity of diesel generator designed for sea level condition decreases at high altitude. True 6. Two pumps can be operated in parallel provided their closed valve heads are not the same. False 7. Installing a VFD and operating a screw compressor at 50 Hz will increase the power consumption. True 8. Building energy performance index (kWh/yr/m2) will not include captive power used in the building. False 9. The COP and EER (w/w) in a refrigeration system will be numerically different. False 10. The gross heat rate of the power plant does not include auxiliary consumption. False . End of Section - I . Section - II: SHORT NUMERICAL QUESTIONS Marks: 2 x 5 = 10 (i) Answer all the Two questions (ii) Each question carries FIVE marks L1 A food processing industry has been importing 3 tonnes/hr of steam, at 8 kg/cm2(g), with an enthalpy of 661 kcal/kg, at a price of Rs 3,200 per tonne, from a neighboring industry. The steam metering is done at the point of delivery. However, the seller is demanding for higher price, as the steam has to be transported over a distance of 1 km, through a 100 mm (internal diameter) pipe line, from the boiler house.

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