ABSA B1 Study Bank Questions And Answers With Complete Solution Rated A+>>2024

Packaged watertube boilers capacities range from? a. 2300 kg to 65000 kg per hour b. 500 kg to 100 mg per hour c. 15 psi to 15000 kg per hour d. 65000 to 100000 kg per hour - A The main advantage of the packaged boiler is its a. small size b. compact design c. low cost D. quality steam - C Feild erected boilers have outputs of? A 75,000 kg/h B 100,000 kg/h C 100 mg/h D 150,000 kg/h or more - D Where electric power is used as a heating source, the boiler rating shall be the maximum kilowatt rating of the A Power plant B Heating element C Boiler wiring D MCC - B The down cameras are located in the _______ regions of the boiler, or external to the furnace all together. The risers are located in the_______zones of the boiler being exposed to radiant heat of the furnace or very hot flu gases near the furnace A Back, front B Cooler, hottest C Water, furnace D Drum, radiant - B The steam separating equipment separates the______ from the steam/water mixture A Water B Steam C Impurities D Water droplets - B There are several factors that influence the natural circulation in a watertube boiler. These are: A The height of the steam drum above the bottom drum or header B The amount of heat applied to the tube. The hotter the tube becomes, the more steam bubbles are formed, creating more mass differential and thus more circulation. C The operating pressure of the boiler. As boiler pressures increase, the density of the steam increases D The cleanliness of the tubes can also affect circulation E All of the above - E The purpose of the downcomer is to supply: A Hot water to the steam drum B Cool water to the steam drum C Cool water from the steam drum to the rest of the boiler D Steam to the steam drum E Boiler feed water to the boiler - C These types of boilers [A, D, and O] have furnaces cooled by_______lining the furnace walls A Watertubes B Fans C Desuperheaters D Air circulation - A A steam generating unit consists of a number of elements all of which contribute to the production of steam. The elements of a typical steam generator include: 1 Boiler 2 Superheater 3 Ash removal equipment 4 Reheater 5 Economizer 6 Steam piping 7 Air heater 8 Fuel equipment 9 Draft fans A 1,2,7,8,9 B 1,2,4,5,7,8,9 C 3,4,6,7,8 D 1,2,3,4,5,7,8,9 - D In steam generating units the feed water entering the boiler section 1st passes through the_______section where it is heated by the combustion gas is leaving the boiler A Furnace B Economizer C Boiler drum D Superheater - B Combustion air for the burners is preheated to ________in the air heater section by combustion gas is leaving the economizer section A 150°C B 100°C C 350°C D 500°C - C Generally two types of draft fans are used. A______ _________fan supplies air to the preheater. The preheated air [350°C] for combustion goes to the coal pulverizers and to the burners. An_______ ________fan exhaust the combustion gases [170°C] from the air heater to the stack A Centre mounted, external mounted B Forced draft, induced draft C Induced draft, forced draft D Turbine draft, ejection draft - B Natural circulation in a boiler depends upon the________in the density of a column of water and the density of a column containing a steam/water mixture A Amount B Mass C Difference D Density - C The difference in density between water and saturated steam becomes progressively less with increased pressure and disappears altogether at the critical pressure A 22,106 kPa B 15,000 kPa C 10,000 kPa