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45 Cards in this Set
- Front
- Back
What is necessary to generate steam in a boiler?
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A container, water and heat.
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What part of the boiler has water on one side and heat on the other?
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The heating surface.
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What type of boiler has heat and gases of combustion that pass through tubes surrounded by water?
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A fire-tube boiler.
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What type of boiler has water in the tubes and heat and gases of combustion passing around the tubes?
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A watertube boiler.
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What is used in boilers to direct the gases of combustion over the boiler heating surface?
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Baffles
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Sensible heat is heat that __________ ?
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Can be measured with a thermometer.
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What is used to transfer heat from one substance to another without allowing the materials to mix?
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A heat exchanger
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In the _________ , air mixes with fuel and burns.
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Combustion chamber.
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________ combustion is combustion that occurs when fuel is burned using only theoretical amount of air?
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Perfect
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_________ air is air supplied to a burner above the theoretical amount required to burn the fuel to ensure complete combustion.
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Excess
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The breaking up of fuel into small particles to maximize contact of fuel with air for combustion is ___________ ?
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Atomization
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What type of system provides the air necessary for combustion?
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A draft system.
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What is the highest pressure in pounds per square inch at which a boiler can be safely operated?
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MAWP
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What type of boiler does not use tubes?
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Cast iron
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What is done to increase the efficiency of the boiler?
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The heating surface is increased.
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What are the four systems necessary to operate a boiler?
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Feedwater, fuel, draft, and steam.
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________ pressure is the pressure caused by the weight of air surrounding the earth.
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Atmospheric
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Name three things a boiler does during operation.
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Holds water, transfers heat to the water to produce steam, and collects the steam that is produced.
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At what temperature does water turn to steam at atmospheric pressure?
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212 degrees Fahrenheit.
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What type of boilers have expandable sections that can be assembled on-site to produce the boiler capacity required? |
Cast iron |
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What is the amount of energy required to raise 1 pound of water 1 degree Fahrenheit?
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1 Btu
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How is heat transferred?
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By conduction, convection, and radiation
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What is a component that is directly attached to the boiler that is required for the operation of the boiler?
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A fitting
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The nonflammable material used to insulate the outer surface of the boiler from heat is _____________ ?
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Refractory
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______________ is pure steam at a temperature that corresponds to the boiling point of water at a specific pressure?
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Saturated steam
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Steam is formed when water is heated to its boiling point. T or F |
True |
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A boiler is an open metal container in which water is heated to produce steam or heated water. T or F |
False |
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Water begins to boil at 212°F at atmospheric pressure. T or F |
True |
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In a scotch marine boiler, the gases of combustion pass through tubes that are surrounded by water. T or F |
True |
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Oxygen is needed to burn fuel. T or F |
True |
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Condensate is typically returned to the boiler for reuse. T or F |
True |
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The steam system supplies water to the boiler. T or F |
False |
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Steam leaves the boiler through the main steam line. T or F |
True |
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Steam that has given up its heat and turned back to water is boiler water. T or F |
False |
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Heat is generated in a boiler by the combustion of a fuel such as gas, fuel oil, or coal. T or F |
True |
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An internal furnace is a furnace in a boiler that is surrounded by heating surface. T or F |
True |
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Feedwater is water that is treated for use in a boiler. T or F |
True |
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Heat always flows from a material having a lower temperature to a material having a higher temperature. T or F |
False |
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Latent heat is heat identified by a change of state and no temperature change of the substance. T or F |
True |
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Conduction is heat transfer that occurs when molecules in a material are heated and the heat is passed from molecule to molecule through the material. T or F |
True |
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Approximately 212 lb of air are required to burn a pound of fuel. T or F |
False |
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The ASME Code governs boiler design, material, method of construction, inspection,and quality assurance. T or F |
True |
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A low pressure boiler is a boiler that has an MAWP over 15 psi. T or F |
False |
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A package boiler is a self-contained unit that is pre-assembled at the factory. T or F |
True |
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A firebox boiler is a cylindrical scotch marine boiler. T or F |
False |