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Chapter 2.8 - Waste Heat Recovery

9 pages, 45 questions, 1 questions with responses, 1 total responses,

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Question bank for Energy Managers & Energy Auditors Chapter 2.8: Waste Heat Recovery Part-I: Objective type questions and answers 1. Major advantage of waste heat recovery in industry is: a) reduction in pollution c) both a & b 2. b) increase in efficiency d) none of the above Heat recovery equipment will be most effective when the temperature of flue gas is: a) 250oC 3. c) 400 oC b) 450 700 c) 700-800 d) 250-440 Recuperator is used mainly as a waste heat recovery system in a ____ . a) boiler b) billet Reheating Furnace c) compressor 5. d) none of the above Recuperator will be more efficient if the flow path of hot and cold fluids is in: a) co-current mode b) counter current mode c) cross current mode 6. d) 280 oC The waste gases coming out from gas turbine exhausts are of the order of: a) 370-540 4. b) 200 oC d) none of the above The major limitation of metallic recuperator is ------a) limitation of handling COx, NOx etc. b) limitation of reduced life for handling temperature more than 1000 oC c) manufacturing difficulty of the required design d) none of the above 7. Ceramic recuperators can withstand temperatures up to: a) 600 oC 8. b) 1300 oC c) 1700oC d) 950oC Air preheater is not used as a waste heat recovery system in a____. a) boiler c) heat treatment furnace 9. b) billet Reheating Furnace d) compressor Typical waste gases temperature from glass melting furnace a) 1000-1550 oC b) 800-950 oC 2.8 Waste Heat - revised (table format) c) 650 750 oC d) 760-815 oC 58

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