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19th National Certification Exam Energy Managers & Auditors SEPTEMBER 2018 Paper 2

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Paper 2 Set A 19th NATIONAL CERTIFICATION EXAMINATION FOR ENERGY MANAGERS & ENERGY AUDITORS SEPTEMBER, 2018 PAPER 2: ENERGY EFFICIENCY IN THERMAL UTILITIES Section I: OBJECTIVE TYPE Marks: 50 x 1 = 50 (i) Answer all 50 questions (ii) Each question carries One mark (iii) Please hatch the appropriate oval in the OMR answer sheet with HB pencil only, as per instructions 1. Density of liquid fuel is measured by an instrument called a) Anemometer b) Hydrometer c) Luxmeter d) All the above 2. The measured O2 in flue gas is 5.5 % by volume, the excess air percentage will be a) 41 % b) 55.9 % d) None of the above c) 35.5 % 3. The efficiency of a reheating furnace, operating at 10 tonnes per hour consuming furnace oil of 230 kg/hour for reheating the material from 40 C to 1100 C (consider specific heat of material is 0.13 kCal / kg C and calorific value of furnace oil is 10,000 kCal/kg) is _______. b) 70 % a) 60 % c) 80 % d) None of the above In FBC boiler the combustion is carried out at a temperature a) Closer to saturated steam temperature b) Below ash fusion temperature of fuel used c) At adiabatic combustion temperature of fuel d) At and above ash fusion temperature of fuel Turbine cylinder efficiency is given as a ratio of________________________ a) Actual enthalpy drop and isentropic enthalpy drop b) Useful heat and power output c) Useful power and heat output d) All of the above The effectiveness of a heat exchanger depends on a) Specific heat of hot fluid b) Specific heat of cold fluid c) Inlet temperature of hot fluid d) LMTD 4. 5. 6. Note: 1 Mark is awarded to all candidate who have attempted this question. 7. Efficiency evaluation requires a) Ash in fuel c) Sulphur in fuel b) d) O2 in flue gas NOx in flue gas Note: 1 Mark is awarded to all candidate who have attempted this question. 8. 9. The evaporation ratio of a coal-fired boiler is 4. Steam enthalpy is 640 kCal/kg; feed water temperature is 55 0C, Calorific Value of coal is 4000 kCal/kg. The boiler efficiency is ________ a) 49 % b) 82 % c) 58.5 % d) 70 % Removal of dissolved gases from the boiler feed water is called a) Degasification b) Deaeration c) Deoxidation d) None of the above 10. Which one of the following is a high temperature heat recovery device? a) Regenerator b) Heat pump c) Heat wheel d) Heat pipe 11. In reheating furnace, scale losses will a) Increase with excess air c) Have no relation with excess air b) Decrease with the excess air d) Increase with CO2% in flue gas

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