Safe Boiler Operation Fundamentals—Special Engineer's Guide for
the State of Minnesota || 100% Exact Answers.
first law of thermodynamics correct answers Energy cannot be created or destroyed
second law of thermodynamics correct answers Heat flows from a higher temperature material to
a lower temperature material
How does the boiling point of water change with steam pressure? correct answers The boiling
point of water increases as steam pressure increases
latent heat correct answers Heat that causes a state change but doesn't change the temperature
sensible heat correct answers Heat that causes a temperature change without a state change
Conduction correct answers The direct transfer of heat from one substance to another substance
that it is touching.
Convection correct answers The transfer of heat by the movement of a fluid
Radiation correct answers Energy that is radiated or transmitted in the form of rays or waves or
particles. Produced upon contact with opaque objects
What are examples of conduction, convection, and radiation in a boiler? correct answers Heat
radiates from combustion flames to the metal surfaces of the boiler, the metal surfaces conduct
heat from the hot side to the cooler side where metal is covered by water or steam. Heat moves
within the steam/hot water via convection.
Firetube boiler correct answers A boiler with tubes of combustion gases passing through the
water space.
, Watertube boiler correct answers A boiler in which water passes through tubes surrounded by
gases of combustion. It provides greater horsepower, steam volume, and pressures.
Low pressure steam heating boiler correct answers Steam is supplied at pressures up to 15 psi
Low Pressure Hot Water Heating Boiler correct answers Supplies hot water at pressure up to 160
psi and a T less than 250°F
Hot Water Supply Boiler correct answers For space heating at pressures of not more than 160 psi
and T under 210°F
Power Hot Water Boiler correct answers Heats liquid to a p greater than 160 psi or a T greater
than 250°F
Power Steam Boiler correct answers Steam is generated at p > 15psi
Low Pressure Steam Boiler correct answers MAWP < 15 psi
High pressure steam boiler correct answers MAWP > 15 psi
Boiler Horsepower (BHP) definition correct answers Heat required to evaporate 34.5 lb/hr water
from and at a T of 212°F
BHP in Btu/hr correct answers 33,472 Btu/hr
How does water circulation in a firetube boiler work? correct answers Water is heated by the
firetubes, which decreases its density, causing it to rise and circulating cooler, more dense water
down to be heated
the State of Minnesota || 100% Exact Answers.
first law of thermodynamics correct answers Energy cannot be created or destroyed
second law of thermodynamics correct answers Heat flows from a higher temperature material to
a lower temperature material
How does the boiling point of water change with steam pressure? correct answers The boiling
point of water increases as steam pressure increases
latent heat correct answers Heat that causes a state change but doesn't change the temperature
sensible heat correct answers Heat that causes a temperature change without a state change
Conduction correct answers The direct transfer of heat from one substance to another substance
that it is touching.
Convection correct answers The transfer of heat by the movement of a fluid
Radiation correct answers Energy that is radiated or transmitted in the form of rays or waves or
particles. Produced upon contact with opaque objects
What are examples of conduction, convection, and radiation in a boiler? correct answers Heat
radiates from combustion flames to the metal surfaces of the boiler, the metal surfaces conduct
heat from the hot side to the cooler side where metal is covered by water or steam. Heat moves
within the steam/hot water via convection.
Firetube boiler correct answers A boiler with tubes of combustion gases passing through the
water space.
, Watertube boiler correct answers A boiler in which water passes through tubes surrounded by
gases of combustion. It provides greater horsepower, steam volume, and pressures.
Low pressure steam heating boiler correct answers Steam is supplied at pressures up to 15 psi
Low Pressure Hot Water Heating Boiler correct answers Supplies hot water at pressure up to 160
psi and a T less than 250°F
Hot Water Supply Boiler correct answers For space heating at pressures of not more than 160 psi
and T under 210°F
Power Hot Water Boiler correct answers Heats liquid to a p greater than 160 psi or a T greater
than 250°F
Power Steam Boiler correct answers Steam is generated at p > 15psi
Low Pressure Steam Boiler correct answers MAWP < 15 psi
High pressure steam boiler correct answers MAWP > 15 psi
Boiler Horsepower (BHP) definition correct answers Heat required to evaporate 34.5 lb/hr water
from and at a T of 212°F
BHP in Btu/hr correct answers 33,472 Btu/hr
How does water circulation in a firetube boiler work? correct answers Water is heated by the
firetubes, which decreases its density, causing it to rise and circulating cooler, more dense water
down to be heated
