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70 Cards in this Set
- Front
- Back
When burning No.6 fuel oil, the strainers should be cleaned at least once every _____ hours.
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24
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When cleaning a fuel oil strainer, the ____ must be carefully replaced to prevent air from entering the system.
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gasket
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The ____ pump draws fuel oil from the fuel oil tank.
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fuel oil
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The _____ valve protects the fuel lines and pump from excessive pressure.
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relief
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A high vacuum on fuel oil suction gauge normally indicates ________ .
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cold fuel or a dirty strainer
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Fuel oil burners are designed to provide fuel oil to the furnace in a ______ .
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fine spray
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The rotary cup burner uses ______ to atomize the fuel oil.
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a spinning cup and high velocity air
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In a low pressure gas burner, gas is mixed with air in the ____________ .
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mixing chamber before the burner register
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In a high pressure gas burner, the gas mixes with the air on the inside of the ________ .
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burner
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A ____ is a narrowed portion of the tube.
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venturi
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On a low pressure gas system, the manual reset cannot be opened until the _________ .
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pilot is lit
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________ coal is a hard coal.
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Anthracite
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In a high pressure gas system, the plant pressure ________ valve reduces gas pressure to the line pressure used in the system.
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regulating
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_______ coal is coal that is ground to a fine powder.
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Pulverized
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A _______ is a mechanical device for feeding coal consistently to the burner.
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stoker
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A(n) _______ is an air pressure-activated switch that closes after proving sufficient pressure of combination air from the forced draft fan.
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air proving switch
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A combination burner allows the operator to switch fuels ___________ .
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for economy, if there is a shortage of a fuel, if there is a failure in the fuel system being used
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Hard coal is __________ .
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anthracite coal with a high carbon content
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Soft coal is ______________.
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bituminous coal with a high volatile content
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A(n) ________ sensor senses light frequencies that are higher than those visible to the eye.
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ultraviolet
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A(n) _______ is a safety device that senses if the pilot light and/or main flame are lit.
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flame scanner
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The _____ of fuel oil is the lowest temperature at which it will flow as a liquid.
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pour point
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Fuel oil and gas are the most commonly used fuels in low pressure boilers.
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True
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The fire point temperature is higher than the flash point temperature.
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True
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A fuel oil relief valve is located between the fuel oil pump and the fuel oil discharge valve.
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True
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The fuel oil pump should be started with its discharge valve open.
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True
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Cold fuel oil in the tank will give a high suction reading.
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True
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A dirty strainer results in low suction readings.
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False
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Starting the fuel oil pump with its discharge valve closed causes the relief valve to open.
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True
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Fuel oil burners commonly use atomizing burners.
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True
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Rotary cup burners can burn only No. 2 fuel oil.
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False
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Rotary cup burners atomize fuel oil using a spinning cup and high-velocity air.
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True
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Air used to atomize fuel oil is primary air.
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True
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Secondary air is needed to burn the fuel oil efficiently.
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True
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In an air atomizing burner, steam and fuel are discharged to the burner for combustion.
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False
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The air atomizing burner uses compressed air to mix with the fuel oil to achieve a high degree of atomization.
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True
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Complete combustion is achieved in a gas burner by supplying the proper mixture of air and gas to the furnace.
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True
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In a rotary cup burner, the solenoid valve controls the flow of fuel through the fuel tube.
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True
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Fuel oil to be removed from the burner nozzle is purged with air.
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True
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A metal scraper is used to clean deposits on a fuel oil burner nozzle.
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False
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In a low pressure gas system, before the manual reset valve can be opened, the pilot must be lit.
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True
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The manual reset valve in the low pressure gas system closes if the boiler has a high water level.
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False
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A fuel oil heater is required when using No. 2 fuel oil.
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False
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Fuel oil is a liquid fossil fuel.
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True
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Plant flexibility is increased with the use of a combination burner.
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True
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Anthracite coal is hard coal.
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True
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Hard coal has a high volatile content.
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False
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Bituminous coal is soft coal.
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True
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Boilers burning soft coal need large furnace volumes to complete combustion.
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True
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Gases of combustion that contact boiler heating surfaces before combustion is completed cause soot and smoke.
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True
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Grates are only needed in hand-fired coal boilers to support the coal.
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False
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Smoke is a sign of incomplete combustion.
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True
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Smoke is less of a problem when burning hard coal as compared to soft coal.
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True
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Stokers were developed to reduce the amount of coal fed to the furnace.
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False
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Stoker firing allowed the design of larger coal-fired boilers.
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True
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The type of fuel used determines the fuel system accessories required.
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True
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Purging the lines and nozzles of an air atomizing burner at the end of its firing cycle keeps lines and nozzles clean for the next starting cycle.
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True
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Natural gas is a colorless and odorless fossil fuel.
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True
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Propane is lighter than natural gas and requires special handling.
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False
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The viscosity of fuel oil is the temperature at which it will burn continually when exposed to an open flame.
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False
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The flash point of fuel oil is the temperature at which it will resist burning.
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False
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It is best to burn fuel oil with a low flash point.
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False
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Pour point is the lowest temperature at which fuel oil will flow as a liquid.
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True
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A therm is the quantity of gas required to produce 100,000 Btu.
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True
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The temperature of the fuel in the fuel oil tank should be maintained at approximately 100°F.
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True
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Fuel oil in the storage tank must be kept below its flash point temperature.
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True
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The temperature of the fuel oil in the storage tank must be kept above the recommended pour point.
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True
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No. 6 fuel oil must be heated to the proper temperature in order to burn.
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True
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The flame scanner proves the main flame only.
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False
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The furnace must be purged after any flame failure.
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True
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