Stationary Engineer License Practice 2024:
answers provided
what is a boiler ✔✔a closed metal container (pressure vessel) which water is heated to
produce steam or heated water
what is steam ✔✔the vapor that forms when water is heated to its boiling point
when did the greatest impact of the use of steam power occur ✔✔during the industrial
revolution 18th and early 19th century
who invented the steam engine and when ✔✔James Watt of Scotland in 1736
How is steam produced ✔✔water is heated to 212 degrees at atmospheric pressure
state the first law of thermodynamics ✔✔energy cannot be created or destroyed but
may be changed from one form to another
state the second law of thermodynamics ✔✔heat always flows from a material at a
high temperature to a material at a low temperature
what is sensible heat ✔✔heat that causes a temperature change that can be measured
with a thermometer or sensed by a person
what is latent heat ✔✔head identified by a change of state and no temperature change
what is a BTU ✔✔the amount of energy required to raise the temperature of 1 lb of
water 1 degree fahrenheit
name 3 ways heat is transferred ✔✔conduction, convection, and radiation
How is heat generated in a boiler ✔✔by the combustion of a fuel
name the 3 conditions of combustion ✔✔perfect, complete. or incomplete
name the 3 classifications of combustion air ✔✔primary air, secondary air, and excess
air
describe the 4 systems all steam boilers operate using ✔✔feedwater system, fuel
system, draft system, and steam system
, what does the feedwater system do? ✔✔supplies the proper amount of water to the
boiler
what does the draft system regulate? ✔✔the flow of air to and from the boiler
what does the fuel system do ✔✔provides fuel for combustion to generate the
necessary heat in the boiler
what does the steam system do? ✔✔collects, controls, and distributes the steam
produced an the boiler
what are symbols used for ✔✔to represent lines, boiler fittings, and accessories on
drawings
what is MAWP ✔✔Maximum Allowable Working Pressure. The recommended
maximum pressure at which a boiler can be safely operated
what is the MAWP of a low pressure boiler ✔✔not more than 15 psi
what is the MAWP of a high pressure boiler ✔✔more than 15 psi
what is a firetube boiler ✔✔a boiler in which heat and gases of combustion pass
through tubes surrounded by water
what is a watertube boiler ✔✔a boiler in which water passes through tubes surrounded
by gases of combustion
what is a cast iron boiler ✔✔a boiler that has gases of combustion flowing around cast
iron sections that contain water
what is an electric boiler ✔✔a boiler that generates heat by electrical resistance or an
electric are
what is a condensing boiler ✔✔a boiler designed to recover some of the heat normally
discharged to the atmosphere in the gases of combustion
what does a safety valve do ✔✔prevents the boiler from exceeding its MAWP and is
the most important valve on a boiler
what is the safety valve capacity ✔✔the amount of steam in pounds per hour that the
safety valve is capable of venting at its rated pressure
how often should a try lever test be performed ✔✔every 30 days the boiler is in
operation
answers provided
what is a boiler ✔✔a closed metal container (pressure vessel) which water is heated to
produce steam or heated water
what is steam ✔✔the vapor that forms when water is heated to its boiling point
when did the greatest impact of the use of steam power occur ✔✔during the industrial
revolution 18th and early 19th century
who invented the steam engine and when ✔✔James Watt of Scotland in 1736
How is steam produced ✔✔water is heated to 212 degrees at atmospheric pressure
state the first law of thermodynamics ✔✔energy cannot be created or destroyed but
may be changed from one form to another
state the second law of thermodynamics ✔✔heat always flows from a material at a
high temperature to a material at a low temperature
what is sensible heat ✔✔heat that causes a temperature change that can be measured
with a thermometer or sensed by a person
what is latent heat ✔✔head identified by a change of state and no temperature change
what is a BTU ✔✔the amount of energy required to raise the temperature of 1 lb of
water 1 degree fahrenheit
name 3 ways heat is transferred ✔✔conduction, convection, and radiation
How is heat generated in a boiler ✔✔by the combustion of a fuel
name the 3 conditions of combustion ✔✔perfect, complete. or incomplete
name the 3 classifications of combustion air ✔✔primary air, secondary air, and excess
air
describe the 4 systems all steam boilers operate using ✔✔feedwater system, fuel
system, draft system, and steam system
, what does the feedwater system do? ✔✔supplies the proper amount of water to the
boiler
what does the draft system regulate? ✔✔the flow of air to and from the boiler
what does the fuel system do ✔✔provides fuel for combustion to generate the
necessary heat in the boiler
what does the steam system do? ✔✔collects, controls, and distributes the steam
produced an the boiler
what are symbols used for ✔✔to represent lines, boiler fittings, and accessories on
drawings
what is MAWP ✔✔Maximum Allowable Working Pressure. The recommended
maximum pressure at which a boiler can be safely operated
what is the MAWP of a low pressure boiler ✔✔not more than 15 psi
what is the MAWP of a high pressure boiler ✔✔more than 15 psi
what is a firetube boiler ✔✔a boiler in which heat and gases of combustion pass
through tubes surrounded by water
what is a watertube boiler ✔✔a boiler in which water passes through tubes surrounded
by gases of combustion
what is a cast iron boiler ✔✔a boiler that has gases of combustion flowing around cast
iron sections that contain water
what is an electric boiler ✔✔a boiler that generates heat by electrical resistance or an
electric are
what is a condensing boiler ✔✔a boiler designed to recover some of the heat normally
discharged to the atmosphere in the gases of combustion
what does a safety valve do ✔✔prevents the boiler from exceeding its MAWP and is
the most important valve on a boiler
what is the safety valve capacity ✔✔the amount of steam in pounds per hour that the
safety valve is capable of venting at its rated pressure
how often should a try lever test be performed ✔✔every 30 days the boiler is in
operation
