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Chapter 2.7 - Cogeneration

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Question bank for Energy Managers & Energy Auditors Chapter 2.7: Cogeneration Part-I: Objective type questions and answers 1. In cogeneration, the system efficiencies can go up to -----a) 70% 2. b) 80% c) 90% d) 60% Cogeneration is the simultaneous generation of ------------. a) heat and power steam and condensate c) Mechanical Energy and power 3. b) d) All the above In the context of cogeneration turbine, thermodynamic process taking place due to: a) contraction 4. c) condensation b) steam turbine c) condenser b) Rankine cycle c) Otto cycle d) Bell-Coleman cycle In a combined cycle power plant consisting of gas turbine and waste heat boiler, the exhaust gas temperature is ____. a) around 150 C b) around 500 C c) around 300 C 7. d) all the above Find the thermodynamic cycle not related to cogeneration. a) Brayton cycle 6. d) all the above Rankine cycle is related to a) boiler 5. b) expansion d) around 400 C Match the following: Cogeneration system Over all efficiency (%) 1. Reciprocating engine i) 70 85 2. Gas turbine ii) 60 80 3. Extraction-condensing steam turbine iii) 75-85 4. Back pressure steam turbine iv) 84-92 1-iii; 2-i; 3-ii, 4-iv 8. _____ type of steam turbines have high power to heat ratio a) b) gas turbine c) 9. back pressure turbine extraction condensing turbine d) None of the above In a glass industry, exhaust gas from the glass melting furnace is used for power generation by installing steam boiler and turbine. Then the type of co-generation is called as: a) gas turbine b) diesel generator 2.7 Cogeneration - revised (table format) c) topping cycle d) bottom cycle 49

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