In a firetube boiler, where do the hot combustion gases travel relative to the boiler water?
Boilers
Question · Easy
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Short
One boiler horsepower (BHP) is defined as the evaporation of how many pounds of water from and at 212°F in one hour?
A packaged steam boiler is nameplated 40 boiler horsepower. Using 33,475 Btu/h per BHP, what is the equivalent heat output?
Question · Medium
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A Scotch marine boiler is classified as which type of boiler?
Why are cast-iron sectional boilers commonly selected for low-pressure hydronic and steam heating plants?
Never enter a tank before testing the air
A steam boiler produces 8,000 lb/h of steam at 1,200 Btu/lb enthalpy. Feedwater enthalpy is 180 Btu/lb and measured fuel input is 9,600,000 Btu/h. What is the boiler efficiency?
Question · Hard
A condensing hydronic boiler achieves higher thermal efficiency primarily by:
A low-pressure steam heating boiler is generally understood to have a maximum allowable working pressure not exceeding:
Compared with a firetube boiler of similar capacity, a watertube boiler is generally preferred for high-pressure steam because:
OSHA fall heights, to scale
Boiler heating surface is best described as:
The factor of evaporation is used when converting actual steam generation to equivalent evaporation from and at 212°F. It is equal to:
A boiler evaporates 1,380 lb/h of steam from and at 212°F. What is the developed boiler horsepower?
A packaged boiler is best described as a boiler that is:
According to the 2021 IMC, packaged electric boilers shall be listed and labeled in accordance with which standard?
Per 2021 IMC Table 1004.3.1, what is the minimum top clearance from a high-pressure steam boiler with steam-generating capacity exceeding 5,000 lb/h to the ceiling or other overhead obstruction?
Unless the boiler is specifically listed for combustible flooring, the 2021 IMC requires boilers to be mounted on:
The 2021 IMC requires every boiler room to be equipped with which drainage provision?
Unless otherwise approved, 2021 IMC 1004.3 requires passageways around all sides of boilers to have an unobstructed width of not less than:
After a boiler is set, what must remain attached to the unit according to 2021 IMC 1004.2?
Under 2021 IMC 1004.7, who must set and operationally test the operating and safety controls on a newly installed hot-water or steam boiler?
What is the primary purpose of a superheater on a steam boiler?
An economizer on a steam-boiler installation is located in the flue-gas path in order to:
In a dry-back Scotch marine boiler, the reversing chamber at the rear of the furnace is:
For multiple-boiler or multiple-modular-boiler installations, 2021 IMC 1005.1 requires:
Coil-type and some water-tube boilers that require forced circulation are commonly protected from dry-firing by:
Carryover from a steam boiler is best described as:
Priming in a steam boiler is the condition in which:
After assembly and installation of a boiler, 2021 IMC 1011.1 requires acceptance tests to be conducted in accordance with:
Per 2021 IMC 1004.1, controls and safety devices for boilers with fuel input ratings of 12,500,000 Btu/h or greater shall meet:
Manholes and handholes on a firetube boiler are provided primarily so that:
Per 2021 IMC Section 1006, a steam boiler shall be protected with a safety valve, while a hot-water boiler shall be protected with a:
Valves And Controls
2021 IMC 1006.4 requires safety and safety-relief valves to be set at not greater than:
Where must a boiler safety or relief valve be installed, and what is prohibited on either side of that connection?
Which installation of a hot-water boiler relief-valve discharge pipe complies with 2021 IMC 1006.6?
The primary function of a low-water cutoff on a steam or hot-water boiler is to:
Under 2021 IMC 1007.1, a conventional low-water cutoff is not required when:
On a hydronic boiler, how should the operating aquastat and the high-limit control be arranged?
A manual-reset high-limit control on a boiler is intended to:
A flame safeguard (flame-supervision) system on a power burner is required to:
What is the purpose of the prepurge period in an automatic boiler burner sequence?
On a low-pressure steam heating boiler, the operating pressure control (pressuretrol) is used to:
An immersion aquastat on a hot-water boiler senses:
Burner turndown ratio is the ratio of:
On a commercial or industrial gas train, two automatic safety shutoff valves in series with a normally open vent valve between them are provided so that:
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