Maryland Boiler License Exam
Questions And Answers 2025/2026
The number of blowdowns required is determined by ? -answerboiler water analysis
A vacuum pump is a boiler accessory used to draw condensate back from the system
by producing negative pressure on the condensate return lines. -answervacuum
Oxygen in the boiler water causes? -answerpitting
A therm is equivalent to ? -answer100,000 BTU
A _______ draft fan is located before the furnace. -answerforced
Impurities that increase the surface tension of boiler water are removed with a _______
blowdown. -answersurface
The primary function of the water column on a low pressure boiler is to reduce ? -
answerWater turbulence
The boiler vent is opened when ? -answerWarming the boiler and during the boiler
A low water condition requires ____________ immediately. -answerSecuring fuel to the
burner
Soot buildup on heating surfaces prevents ? -answerHeat transfer to boiler water
True or False: Oxygen is required for the combustion of fuel. -answerTrue
True or false: A siphon is located between the boiler and steam pressure gauge to
prevent water from entering the Bourdon tube. -answerFalse
True or False: At the NOWL, the gauge glass is approximately half full. -answerTrue
True or False: A low water condition in the boiler can cause overheating of the tubes. -
answerTrue
, True or false: City water does not require treatment for use in a boiler. -answerFalse
True or false: Steam traps prevent the flow of condensate back to the feed-water pump.
-answerFalse
True or false: Clogged fuel oil strainers cause high suction readings. -answerTrue
True or false: A safety data sheet is printed material used to relay chemical hazard
information from the manufacturer, importer, or distributor. -answerTrue
True or false: Draft can be measured with a manometer. -answerTrue
True or false: Sludge is removed from the boiler with a surface blowdown. -answerFalse
True or false: A deaerator is a boiler water treatment accessory that heats feedwater to
the temperature of saturated steam within the pressure vessel. -answerTrue
True or false: All valves are closed when completing a dry lay-up. -answerTrue
True or false: The boiler room log is used to record boiler operation events. -
answerTrue
True or false: Forced circulation hot water heating systems are more common in large
buildings than natural circulation hot water heating systems. -answerTrue
True or false: The pressure reducing valve in a hot water heating system regulates the
water pressure of water returning from heating units. -answerFalse
True or false: A boiler is an open vessel in which water is transformed into steam under
pressure by the application of heat. -answerFalse
True or false: An HRT boiler is a watertube boiler. -answerFalse
In a watertube boiler, the _______ pass(es) through the tubes and the ________
pass(es) across the outside surface of the tubes. -answerwater / combustion gases
The three most common fuels used in steam production are ? -answerNatrual gas, fuel
oil and propane
True or false: In a natural draft furnace, the amount of draft is affected by the height of
the stack. -answerTrue
Fuel oil grades commonly used in boilers are designated by _______ for the lightest
grade of fuel oil through ________ for the heaviest grade of fuel oil. -answerNo. 2 & No
6
Questions And Answers 2025/2026
The number of blowdowns required is determined by ? -answerboiler water analysis
A vacuum pump is a boiler accessory used to draw condensate back from the system
by producing negative pressure on the condensate return lines. -answervacuum
Oxygen in the boiler water causes? -answerpitting
A therm is equivalent to ? -answer100,000 BTU
A _______ draft fan is located before the furnace. -answerforced
Impurities that increase the surface tension of boiler water are removed with a _______
blowdown. -answersurface
The primary function of the water column on a low pressure boiler is to reduce ? -
answerWater turbulence
The boiler vent is opened when ? -answerWarming the boiler and during the boiler
A low water condition requires ____________ immediately. -answerSecuring fuel to the
burner
Soot buildup on heating surfaces prevents ? -answerHeat transfer to boiler water
True or False: Oxygen is required for the combustion of fuel. -answerTrue
True or false: A siphon is located between the boiler and steam pressure gauge to
prevent water from entering the Bourdon tube. -answerFalse
True or False: At the NOWL, the gauge glass is approximately half full. -answerTrue
True or False: A low water condition in the boiler can cause overheating of the tubes. -
answerTrue
, True or false: City water does not require treatment for use in a boiler. -answerFalse
True or false: Steam traps prevent the flow of condensate back to the feed-water pump.
-answerFalse
True or false: Clogged fuel oil strainers cause high suction readings. -answerTrue
True or false: A safety data sheet is printed material used to relay chemical hazard
information from the manufacturer, importer, or distributor. -answerTrue
True or false: Draft can be measured with a manometer. -answerTrue
True or false: Sludge is removed from the boiler with a surface blowdown. -answerFalse
True or false: A deaerator is a boiler water treatment accessory that heats feedwater to
the temperature of saturated steam within the pressure vessel. -answerTrue
True or false: All valves are closed when completing a dry lay-up. -answerTrue
True or false: The boiler room log is used to record boiler operation events. -
answerTrue
True or false: Forced circulation hot water heating systems are more common in large
buildings than natural circulation hot water heating systems. -answerTrue
True or false: The pressure reducing valve in a hot water heating system regulates the
water pressure of water returning from heating units. -answerFalse
True or false: A boiler is an open vessel in which water is transformed into steam under
pressure by the application of heat. -answerFalse
True or false: An HRT boiler is a watertube boiler. -answerFalse
In a watertube boiler, the _______ pass(es) through the tubes and the ________
pass(es) across the outside surface of the tubes. -answerwater / combustion gases
The three most common fuels used in steam production are ? -answerNatrual gas, fuel
oil and propane
True or false: In a natural draft furnace, the amount of draft is affected by the height of
the stack. -answerTrue
Fuel oil grades commonly used in boilers are designated by _______ for the lightest
grade of fuel oil through ________ for the heaviest grade of fuel oil. -answerNo. 2 & No
6
