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Chapter 2.1 - Fuels and Combustion

8 pages, 47 questions, 1 questions with responses, 1 total responses,

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Question bank for Energy Managers & Energy Auditors Chapter 2.1: Fuels and Combustion Part I: Objective type Questions and Answers 1. The unit of Density in SI system is ___. a) kg/m2 2. b) kgf/m3 b) Hydrometer c) Bomb calorimeter d) none of the above The unit of specific gravity in SI system is ___________ a) N/m3 4. d) kg/m3 Name the instrument used for the measurement of specific gravity of liquid fuels a) Gravimeter 3. c) kg/m2 b) kgf/m3 c) kg/m2 d) no unit If the liquid fuel is highly viscous, the action required for proper burning in boiler is ___. a) Pre-heating b) cooling c) mixing d) vapourising 5. In case of net calorific value (NCV) of any fuel, it assumes that water leaves with the combustion products with fully being condensed . State True or False 6. Identify the fuel which has the highest specific gravity. a) furnace oil 7. b) LSHS c) LDO d) HSD In case of fuel oils, choose the correct answer from the following, which describes the relation between specific heat and specific gravity a) lighter oil have higher specific heat c) lighter oil have lower specific heat 8. b) heavier oil have lower specific heat d) none of the above Viscosity of a liquid fluid is very much dependent on a) pressure c) temperature 9. b) pipe size d) colour Presence of sulphur in the boiler fuel leads to a) corrosion b) erosion c) low heat transfer d) none of the above 10. For complete combustion of every kg of FO firing, the approximate theoretical quantity of air required is: a) 14 kg 11. b) 18 kg c) 21 kg d) 10 kg Oxygen (O2) percentage measurement by volume basis can be done by using: a) ultrasonic tester b) potassium oxide probe c) copper tubes d) zirconium oxide probe 12. The percentage requirement of excess air for efficient combustion for coal is less than that of natural gas - State True or False. 13. Turndown ratio for burners is the ratio of a) air to fuel 2.1 Fuels & combustion - revised (table format) 1

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