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Chapter 2.4 - Furnaces

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Question bank for Energy Managers & Energy Auditors Chapter 2.4: Furnaces Part-I: Objective type Questions and Answers 1. The hearth pressure in the heating zone of furnace should be: a) Slightly negative pressure c) High negative pressure 2. b) Slightly positive pressure d) High positive pressure Which of the following furnaces have higher operating efficiency a) low temperature furnaces c) continuous kiln 3. b) high temperature furnaces d) oven For optimum fuel consumption, the pressure at which furnaces operate should be ___. a) slightly negative b) slightly positive c) neutral d) any of the above 4. In case of furnace performance, infiltration is less harmful than exfiltration when compared on energy efficiency aspects. - True or false? 5. The types of furnace in which preheating of air temperature will be maximum with respect to waste heat recovery system is ___. a) recuperative type 6. b) regenerative type c) convective type In large glass industries, the equipment connected with glass melting furnace for preheating the air is ___. a) recuperators b) regenerators c) shell & tube heat exchanger 7. d) none d) heat wheels Pick up the wrong statement: The thermal efficiency of the furnace increases by a) increasing the furnace loading c) reducing the surface heat loss 8. b) increasing the excess air flow rate d) minimising the CO loss and unburnt losses If there is an opening on the furnace body, heat in the furnace escapes to the outside mainly as: a) radiation heat 9. c) convection heat d) none of the above In case of film burners, the excess air level maintained for optimum combustion is of the order of ___. a) 20-25% 10. b) conduction heat b) 5 to 10% c) 15 to 20% d) none of the above The heat storage losses in ceramic fibre insulation in furnaces are maximum compared to other refractories State True or False. 2.4 Furnaces - revised (table format) 25

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