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Chapter 1.4 - Material and Energy Balance

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Question bank for Energy Managers & Energy Auditors Chapter 1.4 Material and Energy Balance Part I: 1. Objective type questions and answers The objective of material and energy balance is to assess the: a) input-output c) losses 2. b) conversion efficiency d) all the above In the material balance of a process or unit operation process, which component will not be considered on the input side? a) Chemicals 3. b) Water/air d) none of them c) both (a) and (b) d) none of the above b) energy output c) energy balance d) all the above In a chemical process of two reactants A (200 kg) and B (200kg) is used as reactants. If conversion is 50% and A and B reacts in equal proportion then calculate the weight of the product formed. b) 200 kg c) 250 kg d) 400 kg In a furnace, the lower the exhaust temperature ____ is the furnace efficiency. a) lower 8. c) both (a) and (b) Sankey diagram shows in graphics ___. a) 150 kg 7. b) output to process b) outputs a) energy input 6. d) By product Losses in material and energy balance is considered as a) inputs 5. c) Recycle In material balance of a process, recycle product is always considered as a) input to process 4. e) none of the above b) moderate c) higher d) none of above Which of the following is the predominant loss in a furnace oil fired boiler? a) dry flue gas losses c) heat loss due to radiation and convection 9. b) heat loss due to moisture in air d) heat loss due to moisture in fuel In a heat treatment furnace the material is heated up to 800 C from ambient temperature of 30 C considering the specific heat of material as 0.13 kCal / kg C. What is the energy content in one kg of material after heating? a) 150 kCal 10. c) 350 kCal 4) 100 kCal If feed of 100 tonnes per hour at 5% concentration is fed to a crystallizer, the product obtained at 25% concentration is equal to ____ tonnes per hour. a) 20 11. b) 250 kCal b) 25 c) 35 d) 40 In an utility steam boiler, heat loss due to radiation normally is in the range of a) 10% b) 14% 1.4 Material and Energy Balance c) 1% d) 8% 23

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