MARYLAND BOILER LICENSE EXAM QUESTIONS 2025 REAL EXAM
QUESTIONS |MOST TESTED QUESTIONS AND CORRECT ANSWERS
|100% ACCURATE|GET IT RIGHT!!
Question 1
How is the required frequency for performing boiler blowdowns correctly determined?
A) By the boiler's steam pressure
B) By the temperature of the feedwater
C) By a regular boiler water analysis
D) By the time of day
E) By the rate of steam production
Correct Answer: C) By a regular boiler water analysis
Rationale: Boiler water analysis is performed to measure the concentration of dissolved and
suspended solids. The number of blowdowns is determined by these test results to keep the
concentration of impurities within the prescribed limits and prevent issues like scale,
corrosion, and priming.
Question 2
What is the function of a vacuum pump in a boiler heating system?
A) To push feedwater into the boiler under high pressure
B) To draw condensate back from the system by producing a negative pressure
C) To remove non-condensable gases from the steam
D) To increase the pressure of the steam leaving the boiler
E) To heat the feedwater before it enters the deaerator
Correct Answer: B) To draw condensate back from the system by producing a negative
pressure
Rationale: In large or complex heating systems, a vacuum pump is used to create a vacuum
(negative pressure) on the condensate return lines. This helps to overcome system
resistance and gravity, ensuring that condensate is effectively drawn back to the feedwater
system.
Question 3
The presence of dissolved oxygen in boiler water is a primary cause of what specific type of
corrosion?
A) Scale formation
B) Caustic embrittlement
C) Pitting
D) General erosion
E) Foaming
Correct Answer: C) Pitting
Rationale: Dissolved oxygen in the boiler water is highly corrosive to the steel surfaces of the
, boiler. It causes a localized, electrochemical attack that results in deep, narrow cavities or
"pits," which can quickly lead to tube failure.
Question 4
A therm is a standard unit of heat energy. One therm is equivalent to how many British Thermal
Units (BTU)?
A) 1,000 BTU
B) 10,000 BTU
C) 100,000 BTU
D) 1,000,000 BTU
E) 34.5 BTU
Correct Answer: C) 100,000 BTU
Rationale: This is the standard definition of a therm, a unit commonly used for measuring the
energy content of natural gas.
Question 5
Where is a forced draft fan located in relation to the boiler furnace?
A) Before the furnace
B) After the furnace, in the breeching
C) At the top of the stack
D) Between the breeching and the stack
E) Inside the furnace itself
Correct Answer: A) Before the furnace
Rationale: A forced draft fan is located at the front of the boiler and functions by pushing or
"forcing" combustion air into the furnace, creating a positive pressure in the furnace.
Question 6
A surface blowdown is performed primarily to remove what type of impurities from the boiler?
A) Heavy sludge and sediment from the bottom of the boiler
B) Dissolved minerals that cause scale
C) Floating impurities that increase the surface tension of the water
D) Dissolved gases like oxygen and carbon dioxide
E) Hard scale from the inside of the boiler tubes
Correct Answer: C) Floating impurities that increase the surface tension of the water
Rationale: A surface blowdown removes water from just below the normal operating water
level. This is where lighter, dissolved, and floating impurities concentrate. Removing them
helps to control the surface tension of the water and prevent foaming and priming.
Question 7
What is the primary function of the water column on a low-pressure boiler?
QUESTIONS |MOST TESTED QUESTIONS AND CORRECT ANSWERS
|100% ACCURATE|GET IT RIGHT!!
Question 1
How is the required frequency for performing boiler blowdowns correctly determined?
A) By the boiler's steam pressure
B) By the temperature of the feedwater
C) By a regular boiler water analysis
D) By the time of day
E) By the rate of steam production
Correct Answer: C) By a regular boiler water analysis
Rationale: Boiler water analysis is performed to measure the concentration of dissolved and
suspended solids. The number of blowdowns is determined by these test results to keep the
concentration of impurities within the prescribed limits and prevent issues like scale,
corrosion, and priming.
Question 2
What is the function of a vacuum pump in a boiler heating system?
A) To push feedwater into the boiler under high pressure
B) To draw condensate back from the system by producing a negative pressure
C) To remove non-condensable gases from the steam
D) To increase the pressure of the steam leaving the boiler
E) To heat the feedwater before it enters the deaerator
Correct Answer: B) To draw condensate back from the system by producing a negative
pressure
Rationale: In large or complex heating systems, a vacuum pump is used to create a vacuum
(negative pressure) on the condensate return lines. This helps to overcome system
resistance and gravity, ensuring that condensate is effectively drawn back to the feedwater
system.
Question 3
The presence of dissolved oxygen in boiler water is a primary cause of what specific type of
corrosion?
A) Scale formation
B) Caustic embrittlement
C) Pitting
D) General erosion
E) Foaming
Correct Answer: C) Pitting
Rationale: Dissolved oxygen in the boiler water is highly corrosive to the steel surfaces of the
, boiler. It causes a localized, electrochemical attack that results in deep, narrow cavities or
"pits," which can quickly lead to tube failure.
Question 4
A therm is a standard unit of heat energy. One therm is equivalent to how many British Thermal
Units (BTU)?
A) 1,000 BTU
B) 10,000 BTU
C) 100,000 BTU
D) 1,000,000 BTU
E) 34.5 BTU
Correct Answer: C) 100,000 BTU
Rationale: This is the standard definition of a therm, a unit commonly used for measuring the
energy content of natural gas.
Question 5
Where is a forced draft fan located in relation to the boiler furnace?
A) Before the furnace
B) After the furnace, in the breeching
C) At the top of the stack
D) Between the breeching and the stack
E) Inside the furnace itself
Correct Answer: A) Before the furnace
Rationale: A forced draft fan is located at the front of the boiler and functions by pushing or
"forcing" combustion air into the furnace, creating a positive pressure in the furnace.
Question 6
A surface blowdown is performed primarily to remove what type of impurities from the boiler?
A) Heavy sludge and sediment from the bottom of the boiler
B) Dissolved minerals that cause scale
C) Floating impurities that increase the surface tension of the water
D) Dissolved gases like oxygen and carbon dioxide
E) Hard scale from the inside of the boiler tubes
Correct Answer: C) Floating impurities that increase the surface tension of the water
Rationale: A surface blowdown removes water from just below the normal operating water
level. This is where lighter, dissolved, and floating impurities concentrate. Removing them
helps to control the surface tension of the water and prevent foaming and priming.
Question 7
What is the primary function of the water column on a low-pressure boiler?
