Cast iron boiler {Ans: Have sections that can be assembled on-site to produce the boiler capacity required}Btu {Ans: The amount of energy required to raise the temperature of 1 lb of water 1°F is 1 _____}Water, heat and container {Ans: Is necessary to generate steam in a boiler}Watertube {Ans: A _____ boiler has water in the tubes and heat and gases of combustion passing around the tubes}Cast iron {Ans: A _____ boiler does not use tubes}Firetube {Ans: A _____ boiler has heat and gases of combustion that pass through tubes surrounded by water}Feedwater, fuel, draft and steam {Ans: The four systems necessary to operate a boiler are _____, _____, _____, and _____}Baffles {Ans: _____ are used in boilers to direct the gases of combustion over the boiler heating surface}Combustion chamber {Ans: In the _____, air mixes with fuel and burns}Heating surface {Ans: The _____ is the part of the boiler with water on one side and heat on the other}Atmospheric pressure {Ans: Is the pressure caused by the weight of air surrounding the earth}Increase heating surface {Ans: To increase efficiency of the boiler, _____}NOWL {Ans: Normal operating