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Chapter 2.2 - Boilers

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Question bank for Energy Managers & Energy Auditors Chapter 2.2: Boilers Part I: Objective type Questions and Answers 1. The minimum capacity of any closed vessel which generates steam under Indian Boilers Regulation Act is ___. a) 2.275 liters c) 227.5 liters 2. b) 22.75 kilo liters d) 22.75 liters Steam is preferred medium for heating applications because: a) high latent heat c) Easy to control and distribute 3. b) temperature break down is easy d) all the above For higher boiler efficiencies, the feed water is heated by ____. a. recuperator c. super heater 4. b. convective heater d. economiser The type of firing used for a pulverised coal fired boiler is: a) over firing c) vertical firing 5. b) tangential firing d) mixed firing for effective heat transfer The recommended TDS level in boiler drum, that can be safely maintained for the water tube boiler is: a) 3000 3500 ppm c) 5000 ppm 6. b) 2000 ppm d) It can be anything An evaporation ratio (steam to fuel ratio) of an efficient oil fired boiler is in the range of ___. a) 5 6 c) 1 7. b) 13 - 16 d) 7 9 Pick the boiler, which can be considered as most combustion efficient? a) fluidised bed combustion boiler c) Stoker fired boiler 8. b) lanchashire boiler d) chain grate boiler The percentage excess air required for pulverised coal fired boiler is: a) 40 50% c) 60 80% 9. b) 15 20% d) 30 40% Name the predominant loss component for furnace oil fed boiler. a) losses due to radiation and convention c) loss due to dry flue gas 10. b) loss due to hydrogen in fuel d) loss due to moisture in fuel Controlled wetting of coal (during the coal preparation) would result in a) reduction in flue gas exit temperature b) decrease in the percentage of unburnt carbon c) improper combustion d) increase in the fines of coal 2.2 Boilers -revised (table format). 9

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