Class 5 Boiler Exam questions and answers 2026\2027
A+ Grade
All safety relief valves installed on pressure equipment in OR must be _________ approved
- correct answer ASME
Steam trap discharge piping shall be designed to the same _______ unless it is __________ to
atmosphere
- correct answer pressure, vented
Which of the following is not considered a type of weld
- correct answer Fillet
T/F Low and high pressure gas switches only are required on boilers of 12.5 mbtu and greater.
- correct answer True
T/F Combustion air requirements are not the responsibility of the boiler installation contractor.
- correct answer False
T/F Bell and spigot fittings may be used on refrigeration service.
- correct answer False
T/F All valves and cocks with steam or spindle shall have adjustable pressure type packing glands for
steam and heating boilers.
- correct answer True
T/F You can rebuild boiler controls.
- correct answer False
, T/F Combustion air proving can be controlled by an energy management system.
- correct answer False
Under ASME sec IV part HG400 safety valve for a 15lb steam heating boiler over 15000 btu heat insput
shall not be smaller than ______ and larger than ______.
- correct answer 1, 4 1/2 NPS
In a completed groove weld, the term for the surface of the weld on the side from which the welding is
done is the _______ ________.
- correct answer weld face
T/F Class 5A certificate holder can install either ASME B31.1 or B31.5 pressure piping.
- correct answer False
T/F Boilers under 400k btu are exempt from the requirements of ASME CSD-1
- correct answer False
T/F Pipe fabricated in the shop needs to be inspected by your companies quality control manager but
the boiler inspector only needs to see the piping once it is on the job site.
- correct answer True
What class fire is fueled by liquids?
- correct answer Class B
An installation permit which has been processed through the boiler section must:
- correct answer Be obtained prior to starting work and posted on the site prior to start of work
T/F All automatically fired boilers from 12,500,000 btu or less are subected to ASME CSD.1
- correct answer True
Doubling the size of pipe increases the capacity by how many times?
- correct answer Four
A+ Grade
All safety relief valves installed on pressure equipment in OR must be _________ approved
- correct answer ASME
Steam trap discharge piping shall be designed to the same _______ unless it is __________ to
atmosphere
- correct answer pressure, vented
Which of the following is not considered a type of weld
- correct answer Fillet
T/F Low and high pressure gas switches only are required on boilers of 12.5 mbtu and greater.
- correct answer True
T/F Combustion air requirements are not the responsibility of the boiler installation contractor.
- correct answer False
T/F Bell and spigot fittings may be used on refrigeration service.
- correct answer False
T/F All valves and cocks with steam or spindle shall have adjustable pressure type packing glands for
steam and heating boilers.
- correct answer True
T/F You can rebuild boiler controls.
- correct answer False
, T/F Combustion air proving can be controlled by an energy management system.
- correct answer False
Under ASME sec IV part HG400 safety valve for a 15lb steam heating boiler over 15000 btu heat insput
shall not be smaller than ______ and larger than ______.
- correct answer 1, 4 1/2 NPS
In a completed groove weld, the term for the surface of the weld on the side from which the welding is
done is the _______ ________.
- correct answer weld face
T/F Class 5A certificate holder can install either ASME B31.1 or B31.5 pressure piping.
- correct answer False
T/F Boilers under 400k btu are exempt from the requirements of ASME CSD-1
- correct answer False
T/F Pipe fabricated in the shop needs to be inspected by your companies quality control manager but
the boiler inspector only needs to see the piping once it is on the job site.
- correct answer True
What class fire is fueled by liquids?
- correct answer Class B
An installation permit which has been processed through the boiler section must:
- correct answer Be obtained prior to starting work and posted on the site prior to start of work
T/F All automatically fired boilers from 12,500,000 btu or less are subected to ASME CSD.1
- correct answer True
Doubling the size of pipe increases the capacity by how many times?
- correct answer Four
