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1st National Certification Exam Energy Managers 2004 Paper 2

6 pages, 66 questions, 1 questions with responses, 1 total responses,

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Paper EM2 Energy Manager Set A NATIONAL CERTIFICATION EXAMINATION 2004 FOR ENERGY MANAGERS PAPER EM2: Energy Efficiency in Thermal Utilities Date: 22.05.2004 Timings: 1400 - 1700 HRS Duration: 3 HRS Max. Marks: 150 General instructions: o o o o o Please check that this question paper contains 6 printed pages Please check that this question paper contains 65 questions The question paper is divided into three sections All questions in all three sections are compulsory All parts of a question should be answered at one place Section I: OBJECTIVE TYPE (i) (ii) (iii) 1. Answer all 50 questions Each question carries one mark Put a ( ) tick mark in the appropriate box in the answer book Excess air can be derived by measuring the percentage of in the flue gas. a) CH4 2. b) N2 b) LDO c) Hexane d) Iso-Octane b) 300 Redwood Seconds-1 d) 400 Redwood Seconds-1 Stoichiometric air to fuel ratio for Indian coals used in thermal power plants is in the range b) 8 - 10 c) 3 - 6 d) 10 - 14 Element in fuel oil responsible for corrosion is a) Carbon 7. d) natural gas Suitable atomizing viscosity of furnace oil for use in LAP/MAP burners is a) below 3 6. c) coal b) Butane a) 100 Redwood seconds-1 c) 600 Red wood seconds-1 5. d) CO2 LPG consists of one of the following a) Methane 4. c) CO Which of the following fuel requires the least amount of excess air for complete combustion? a) furnace oil 3. Marks: 50 x 1 = 50 b) Sulphur c) Hydrogen d) Chlorine A system in which a package type boiler operates with a FD fan is called a) Natural draft b) Forced draft _______________________ Bureau of Energy Efficiency c) Induced draft d) Balanced draft 1 Paper EM2 Energy Manager Set A 8. Steam generation in a boiler is 26 tonnes in 2 hours. Fuel consumption in the same period is 1 tonnes per hour. The evaporation ratio is a) 10 9. b) 12 b) Hydrogen in fuel b) fuel oil b) 8 kgs/cm2 c) 12 kgs/cm2 b) inverted bucket d) none of the above b) 250 mm in 30 metres d) 350 mm in 30 metres Heat loss through openings in furnaces is directly proportional to b) square of absolute temperature d) fourth power of temperature Furnace wall heat loss does not depend on b) temperature of air around the furnace d) stock to be heated The efficiency of a stand alone gas turbine without any heat recovery system will be in the range of a) 10 15 % 19. c) thermostatic Steam mains should be run with a falling slope of in the direction of steam flow for effective line condensate drainage a) temperature of external surface c) emissivity of external wall surfaces 18. d) 20 kgs/cm2 Which of the steam trap operates on the principle of difference in density between steam and condensate a) fourth power of absolute temperature c) absolute temperature 17. d) excess air b) stack loss d) blow down loss a) 125 mm in 30 metres c) 50 mm in 30 meteres 16. c) steam trap At which of the following pressure, the enthalpy of evaporation of steam will be highest a) thermodynamic 15. d) feed water Major heat loss in an oil fired boiler is accounted by a) 2 kgs/cm2 14. c) air for combustion of fuel b) blow down a) surface radiation loss c) un-burnt carbon loss 13. d) Ash in fuel Concentration of solids in boiler drum is controlled by a) steam venting 12. c) Sulphur in fuel Economizer in boiler is used to extract heat from flue gases for pre-heating a) blow down 11. d) 26 The limiting temperature to which the flue gases can be cooled is influenced by percentage of a) Carbon in fuel 10. c) 13 b) 15 20 % c) 20 25 % d) 35 40 % Which of the following influences energy savings when ceramic coating is applied on furnace hot side a) conductivity c) emissivity _______________________ Bureau of Energy Efficiency b) convective heat transfer coefficient d) factor for total radiation 2 Paper EM2 Energy Manager Set A 20. Which of the following is not a property of ceramic fibre insulation. a) low thermal conductivity c) high heat capacity 21. Fuel bed temperature in a FBC boiler is about a) 550 oC 22. b) 900oC b) NOx b) pulp & paper b) 1300oC b) 400oC b) heat pump c) heat wheel d) thermocompressor c) plate heat exchanger d) economizer Which of the following equipment requires electricity for its operation b) heat pump c) heat pipe d) economizer The average reduction of flue gas temperature by . results in an efficiency increase of the boiler by 1% point b) 22oC c) 32oC d) 42oC The equipment used to upgrade a low pressure steam to a higher pressure steam is known as a) heat pump 32. d) 800oC The device that upgrades a low temperature heat source to a higher temperature sink is called a) 12oC 31. d) 1700o C c) 600oC b) recuperator a) thermocompressor 30. c) 1000oC Which among the following uses a sealed working fluid for heat recovery a) heat pipe 29. d) foundry The waste heat recovery equipment in a combustion system will be more economical when the exit flue gases are at a temperature of a) heat pipe 28. c) refinery Ceramic recuperators can withstand gas side temperature up to a) 200oC 27. d) O2 Which of the following industry may not be ideal for adoption of co-generation system a) 400oC 26. c) CO2 b) low excess air d) much smaller size a) fertilizer 25. d) 1700 oC A major advantage of PFBC boilers compared to conventional pulverised coal fired boiler is a) less ash removal c) low radiation loss 24. c) 1400 oC Low combustion temperature in FBC boilers results in reduced formation of a) SOx 23. b) light weight d) thermal shock resistant b) thermocompressor c) heat pipe d) heat wheel Which of the following boiler has the largest permissible boiler drum TDS concentration a) low pressure water tube boiler c) lancashire boiler _______________________ Bureau of Energy Efficiency b) high pressure water tube boiler d) package and economic boiler 3 Paper EM2 Energy Manager Set A 33. A power plant which uses first a gas turbine followed by a steam turbine for power generation is called a) topping cycle c) Brayton cycle 34. b) combined cycle d) bottoming cycle The Gross Calorific Value of furnace oil, LSHS and LDO is of the order of a) 5,000 kilo calorie per kg c) 10,000 kilo calorie per kg 35. b) 8,000 kilo calorie per kg. d) 13,000 kilo calorie per kg A co-generation system is also known as a) reversible system c) combined heat and power system 36. b) re-generation system d) Brayton cycle system Which of the following will not conserve energy in a furnace a) preheating combustion air c) optimizing excess air 37 Regenerators are widely used in a) reheating furnaces c) baking ovens 38. b) heat treatment furnaces d) glass melting furnaces The efficiency of a re-heating furnace, operating at 10 tonnes per hour consuming furnace oil of 460 kg/hour for reheating the stock from 40oC to 1100oC. (Specific heat of material is 0.13 kCal/kg0C) is about a) 20 39. b) charge preheating d) addition of more burners b) 30 c) 40 d) 50 What is the major energy loss in an oil fired reheating furnace? a) loss due to evaporation of moisture in fuel c) sensible heat loss in flue gas 40. b) skin losses d) heat loss through openings Which of the following does not contribute to efficient use of steam a) superheated steam for indirect process heating b) insulation of steam pipe lines c) reducing the work to be done by steam d) providing dry steam for process 41. The purpose of venting air from steam systems is because air is a a) dilutant c) good conductor 42. b) inert substance d) insulator Steam is used as a heat transfer medium in an industry because of the following main factor a) water is easily available b) steam can be transported c) releases maximum heat during heat transfer at a fixed temperature d) none of the above 43. The coefficient of thermal expansion of refractory material should be a) very high _______________________ Bureau of Energy Efficiency b) high c) medium d) low 4 Paper EM2 Energy Manager Set A 44. High emissivity coatings are most effective when applied on 45. a) inner surface of furnace c) refrigeration pipings Alumina is a type of refractory. 46. a) acid b) neutral c) basic The efficiency of a typical FBC boiler would be around a) 90% 47. b) 80% b) outer surface of furnace d) none of the above d) none of the above c) 70% d) 40% In FBC boiler the combustion is carried out at a temperature a) closer to steam temperature b) below ash fusion temperature of fuel used c) at adiabatic combustion temperature d) at and above ash fusion temperature 48. In a CFBC boiler the capture and recycling of bed materials is accomplished by a) cyclone 49. c) settling chamber d) scrubber system The equipment having the highest efficiency in case of conventional power plant is a) boiler 50. b) back filter b) electric generator c) cooling tower d) steam or gas turbine The major limitation of metallic recuperator is a) limitation of handling SOx, NOx gases. b) manufacturing difficulty of the required design c) limitation of reduced life for handling temperature above 1000oC d) none of the above . End of Section I . Section II: SHORT DESCRIPTIVE QUESTIONS (i) (ii) Marks: 10 x 5 = 50 Answer all Ten questions Each question carries Five marks S-1. List some applications using ceramic fibre. S-2. What are the important aspects to be considered for retrofitting a conventional boiler to FBC technology? S-3. Explain what is meant by a combined cycle. _______________________ Bureau of Energy Efficiency 5 Paper EM2 Energy Manager Set A S-4. List at least five important parameters to be considered before installing a cogeneration system. S-5. What is a heat pipe ? How does it work? S-6. Explain the meaning of dryness fraction of steam. S-7. How is percentage of excess air level calculated from data obtained from a flue gas analysis of boilers or furnaces? S-8. What is meant by wall losses of a furnace? How can they be minimized? S-9. Explain the importance of deaeration of boiler feed water. S-10. In a boiler drum the permissible TDS is 2000 ppm, permissible make up water is 10 per cent of feed water and TDS of feed water is 200 ppm. Find out the blow down percentage? . End of Section II . Section III: LONG DESCRIPTIVE QUESTIONS (i) (ii) L-1. Marks: 5 x 10 = 50 Answer all Five questions Each question carries Ten marks (i) Explain why the furnace efficiency is low in comparison to a typical steam boiler efficiency. (ii) A furnace of 12 tonnes/ hr output consumes 900 kg/hr of fuel oil. Calculate the furnace efficiency by assuming specific heat of the stock material as 0.15 kcal/kgoC, stock material heated from 90oC to 1250oC, and GCV of fuel oil as 11500 kcal/kg. L-2. Discuss four major energy conservation opportunities in a boiler system? L-3. Describe any five properties of ceramic fibre from the point of view of their uses in furnace. L-4. Discuss advantages of condensate and flash steam recovery in steam systems. L-5. What is meant by heat- to- power ratio in a cogeneration system? Show in a sketch three different modes in which a single steam turbine can be used for cogeneration. . End of Section III . _______________________ Bureau of Energy Efficiency 6

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