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15th National Certification Exam Energy Managers & Auditors AUGUST 2014 Paper 2

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Paper 2 Set A 15th NATIONAL CERTIFICATION EXAMINATION FOR ENERGY MANAGERS & ENERGY AUDITORS August, 2014 PAPER 2: Energy Efficiency in Thermal Utilities Date:23-8-2014 Timings:14:00-17:00 Duration: 3 HRS Section I: OBJECTIVE TYPE (i) (ii) (iii) 1. If the terminal temperature differences at the hot and cold end of a heat exchanger is same, then the LMTD is b) 0 oC c) 50 oC d) none of the above Which of the following fuel fired steam boiler will have the least evaporation ratio? a) coconut shell 3. Marks: 50 x 1 = 50 Answer all 50 questions Each question carries one mark Please hatch the appropriate oval in the OMR answer sheet with black pen or HB pencil. a) 100 oC 2. Max. Marks: 150 b) natural gas c) oil d) rice husk Which of these is not true of critical point of steam/water mixture? a) the temperature at critical point is 374.15oC b) the pressure at critical point is 221.2 bar c) saturated liquid and saturated vapour lines meet at critical point d) enthalpy of evaporation is maximum at critical point 4. Which of these fuels has the highest heating value? a) LPG 5. b) methane b) super heated steam d) wet steam What is the predominant mode of heat transfer in reheating furnaces? a) convection 8. b) thermostatic trap d) none of the above Which of the following will be ideal for heat transfer in a heat exchanger? a) hot water c) saturated dry steam 7. d) diesel The difference in temperature between steam and condensate is the principle of operation in a a) thermodynamic trap c) orifice type trap 6. c) hydrogen b) radiation c) conduction d) pulsation In a gas turbine, air compressor alone consumes about _____of the energy generated _________________________ Bureau of Energy Efficiency 1

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