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38 Cards in this Set
- Front
- Back
The induced draft fan is located in the ___.
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breeching
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The amount of natural draft present can be affected by ___.
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dampers opened or closed, temperature of the gases of combustion, height of the chimney
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Draft is the difference in pressure between two points that causes ___ to flow.
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air, natural gas, gases of combustion
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A ___ is a steel chimney used to direct the flow of gases of combustion from the boiler to the atmosphere.
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stack
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Forced draft and induced draft are two types of ___ draft.
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mechanical
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Mechanical draft is produced by ___.
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power-driven fans
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___ draft is air that is pulled through the boiler.
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Induced
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___ draft is produced when air is pushed through the burner.
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Forced
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When using ___ draft, the boiler is limited in the amount of fuel that can be burned.
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natural
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By using ___ draft, higher rates of combustion can be achieved.
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mechanical
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Cold outside air affects the amount of ___ draft produced.
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natural
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Draft gauge measurements are expressed in inches of ___.
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water column
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When measuring draft in the boiler, one leg of the tube is open to the boiler and the other to the ___.
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atmosphere
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A ___ is a simple draft gauge consisting of a U-shaped glass tube.
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manometer
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Improperly burned fuel results in ___.
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soot and smoke
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High combustion efficiency produces the maximum amount of ___ generated by the fuel.
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heat
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Too much draft when burning coal may cause ___.
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too hot a fire
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Combination forced and induced draft is also known as ___ draft.
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balanced
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Draft is the difference in pressure between two areas that causes air or gases of combustion to flow.
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True
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Gases move from an area of low pressure to an area of high pressure.
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False
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The two types of draft are mechanical and forced.
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False
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Mechanical draft is produced by a fan or blower.
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True
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Air is necessary for combustion process to take place.
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True
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Dampers are used to control the flow of air and gases of combustion.
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True
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Approximately 75 lb of air is required for every pound of fuel burned.
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False
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The amount of natural draft generated is affected by the height of the chimney.
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True
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The two types of mechanical draft are forced and induced.
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True
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The induced draft fan is located on the front of the boiler.
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False
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Extraordinary changes that occur in the oxygen content of the gases of combustion indicate a potential problem in the fuel system and/or draft system.
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True
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When using natural draft, the boiler is limited in the amount of fuel that can be burned.
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True
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The forced draft fan is located in the breeching.
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False
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Some boilers have combination forced and induced draft fans.
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True
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Draft gauges are calibrated in the same way as pressure gauges.
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False
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A cool stack condition can result in condensation of water vapor in the gases of combustion.
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True
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Natural draft produces greater amounts of draft in the winter than in the summer.
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True
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Proper control of draft results in higher combustion efficiency.
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True
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When using a manometer to measure draft, the liquid level in one leg is compared to the liquid level in the other leg.
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True
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The amount of draft determines the rate of combustion.
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True
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