Class 5 Boiler Operator Exam Practice
Questions | ASME, B31.1, B31.3, Welding,
Safety (2025 Update)
branch connections to piping systems "made in the field" and are of welded assembly being
of pipe to pipe require what considerations...
is the angle of insertion what the code allows
does the connection require reinforcement
did the engineer approve it
B31.1
Power Piping - High Pressure Steam - over 15 psi
B31.9
Building Services - Low Pressure Steam - under 15 psi
B31.5
Refrigeration Code
B31.3
Normal Fluid Systems - Catagory M - co-ax sleeves/permit required
DCEN
Direct Current Electrode Negative (TIG)
DCEP
Direct Current Electrode Positive (Stick)
Formula for circumference
pi x diameter
A friction lighter is a striker
True
What type of fitting is installed at every right angle?
Crosses
,The included angle of a center punch is:
60 degrees
example of "Place of Public Assembly"
College campus
What is the minimum size pipe allowed on a control loop of a steam boiler?
1"
Inspection of Catagory M piping is not required by a state inspector, if the authorized owner
representative performs the inspection...
True
The Chief Inspector may enter all buildings at reasonable hours for inspections, except:
Private Residences
When there are two blow down valves they will be which type?
One quick opening and one slow opening
Which of the following is an example of vessels exempt from annual inspection?
vessels in storage - those of a federal agency - Hydronic in a private residence
The place on an isometric drawing which shows the components being used is called:
Bill of Material
Brazing is covered under ASME section
IX (nine)
When cutting pipe with heat number, transfer the number....
BEFORE cutting
The letter "F", in A53F pipe stands for:
Furnace Welded
Repair permits are issued to the:
Licensed contractor doing the work
Adding a pipe branch by means of welding is allowed if...
,The need for reinforcements has been calculated
Under B31.5, pipe larger than what size is covered?
2"
When welding stainless steel, what are the potentially dangerous oxides that are produced?
Nickel and Chromium
What extinguishing agent is used in Class A fires?
Water
Medical sterilized smaller than ______cu. ft. are exempt?
1 1/2 cu. ft.
There is a $1,000 fine for anyone working, without a license, on pressure piping.
True
Pool boilers are exempt if......
the burner is wired in series with the pump
What class of fire is burning magnesium?
Class D
Refrigerant or a/c units containing _____ cu. ft. or less of non-corrosive gases are exempt.
3
Pressure relief devices must be approved by what agency?
ASME (American Society of Mechanical Engineers)
When hydro testing NBEP (Non-Boiler External Piping), it must be off from the boiler and
tested at how many times the operating pressure?
1 1/2
When securing wire rope, the clips are applied:
Saddle on live end
**A stop valve CANNOT be installed btwn the boiler and the relief valve....
TRUE
, When the weld symbol is on the top of the welding symbol (arrow), it means ...
Weld on the other sider
What type of stuffing box is used on high pressure/temp. valve?
Lantern type rigging
If you hold a Class IV or Class V license, you are allowed to supervise ....
class VI
Under B31.5, A1 and B1 refrigerant is classified by its toxicity and flammability.
True
How many automatic low-water fuel cutoff devices shall there be on each automatically fired
high-pressure steam boilers?
Two
Which code section covers Power Piping?
B31.1
How far apart are oxygen and acetylene bottles to be stored?
20 feet
Agriculturally used air tanks on a farm are exempt.
True
What is the heat affected zone?
The area adjacent to the weld
Total hours of welding on pressure piping must you have to apply for a Class B license?
2000 hours
Journeymen Plumbers are exempt from having a Class V license to install or replace, by non-
welded means, a potable water heater, not used for space heating up to 180 gallons, 210
degrees, 150 psi and 75000 BTU
TRUE
What method of testing is used on a root pass?
PT liquid penetrant and MT magnetic particle
Questions | ASME, B31.1, B31.3, Welding,
Safety (2025 Update)
branch connections to piping systems "made in the field" and are of welded assembly being
of pipe to pipe require what considerations...
is the angle of insertion what the code allows
does the connection require reinforcement
did the engineer approve it
B31.1
Power Piping - High Pressure Steam - over 15 psi
B31.9
Building Services - Low Pressure Steam - under 15 psi
B31.5
Refrigeration Code
B31.3
Normal Fluid Systems - Catagory M - co-ax sleeves/permit required
DCEN
Direct Current Electrode Negative (TIG)
DCEP
Direct Current Electrode Positive (Stick)
Formula for circumference
pi x diameter
A friction lighter is a striker
True
What type of fitting is installed at every right angle?
Crosses
,The included angle of a center punch is:
60 degrees
example of "Place of Public Assembly"
College campus
What is the minimum size pipe allowed on a control loop of a steam boiler?
1"
Inspection of Catagory M piping is not required by a state inspector, if the authorized owner
representative performs the inspection...
True
The Chief Inspector may enter all buildings at reasonable hours for inspections, except:
Private Residences
When there are two blow down valves they will be which type?
One quick opening and one slow opening
Which of the following is an example of vessels exempt from annual inspection?
vessels in storage - those of a federal agency - Hydronic in a private residence
The place on an isometric drawing which shows the components being used is called:
Bill of Material
Brazing is covered under ASME section
IX (nine)
When cutting pipe with heat number, transfer the number....
BEFORE cutting
The letter "F", in A53F pipe stands for:
Furnace Welded
Repair permits are issued to the:
Licensed contractor doing the work
Adding a pipe branch by means of welding is allowed if...
,The need for reinforcements has been calculated
Under B31.5, pipe larger than what size is covered?
2"
When welding stainless steel, what are the potentially dangerous oxides that are produced?
Nickel and Chromium
What extinguishing agent is used in Class A fires?
Water
Medical sterilized smaller than ______cu. ft. are exempt?
1 1/2 cu. ft.
There is a $1,000 fine for anyone working, without a license, on pressure piping.
True
Pool boilers are exempt if......
the burner is wired in series with the pump
What class of fire is burning magnesium?
Class D
Refrigerant or a/c units containing _____ cu. ft. or less of non-corrosive gases are exempt.
3
Pressure relief devices must be approved by what agency?
ASME (American Society of Mechanical Engineers)
When hydro testing NBEP (Non-Boiler External Piping), it must be off from the boiler and
tested at how many times the operating pressure?
1 1/2
When securing wire rope, the clips are applied:
Saddle on live end
**A stop valve CANNOT be installed btwn the boiler and the relief valve....
TRUE
, When the weld symbol is on the top of the welding symbol (arrow), it means ...
Weld on the other sider
What type of stuffing box is used on high pressure/temp. valve?
Lantern type rigging
If you hold a Class IV or Class V license, you are allowed to supervise ....
class VI
Under B31.5, A1 and B1 refrigerant is classified by its toxicity and flammability.
True
How many automatic low-water fuel cutoff devices shall there be on each automatically fired
high-pressure steam boilers?
Two
Which code section covers Power Piping?
B31.1
How far apart are oxygen and acetylene bottles to be stored?
20 feet
Agriculturally used air tanks on a farm are exempt.
True
What is the heat affected zone?
The area adjacent to the weld
Total hours of welding on pressure piping must you have to apply for a Class B license?
2000 hours
Journeymen Plumbers are exempt from having a Class V license to install or replace, by non-
welded means, a potable water heater, not used for space heating up to 180 gallons, 210
degrees, 150 psi and 75000 BTU
TRUE
What method of testing is used on a root pass?
PT liquid penetrant and MT magnetic particle
