CLASS 5 BOILER FINAL PAPER 2025/2026 QUESTIONS
WITH ANSWERS GRADED A+
✔✔t/f All cast iron boilers shall be provided with a wash out opening which is not smaller
than 1 1/2 nps - ✔✔False
✔✔Which non destructive examination method best reveals lack of fusion in a finished
weld? - ✔✔Radiography
✔✔Steam boilers operated at 10 psig are required to be constructed under which ASME
code? - ✔✔Section IV
✔✔Hot H2O heating and hot H2O supply boilers must be tested at a pressure of -
✔✔1.5 mawp
✔✔Which of the following provides information required to make sound welds for ASME
service? - ✔✔the engineered working drawings or PQR
✔✔Heat numbers are to be transferred ________ to cutting any material. - ✔✔Prior
✔✔Before entering a boiler or pressure vessel: - ✔✔company confined space
procedures are followed.
✔✔t/f Ammonia piping installation falls under the state boiler safety program. - ✔✔False
✔✔In addition to visual examination for A3 & A4 refrigerant piping, at least _______ of
the circumferential but and miter groove piping must be examined by random
radiography. - ✔✔5%
✔✔The max temp and pressure for cast iron fittings that may be used on a code boiler
is - ✔✔250-450
✔✔t/f Slag inclusions on ASME code pipe must always be removed? - ✔✔False
✔✔Which of the following gases can be used as shielding gas for gmaw? - ✔✔Carbon
dioxide
✔✔t/f Tack welds must use a qualified weld procedure - ✔✔true
✔✔A blueprint solid line with an arrow is a _______ ________. - ✔✔Dimension line
✔✔Fire extinguisher chemical agent to put out class C fires - ✔✔CO2
, ✔✔Electric boilers must meet ________ - ✔✔CSD1
✔✔How much pressure is in an inch of water column - ✔✔.036
✔✔How many low water cutoffs are required for steam boilers < 15 psig? - ✔✔2
✔✔Building Service Steam Piping operates at a pressure no less than _______ -
✔✔150
✔✔t/f Washout openings on cast iron shall be no smaller than 1.5" nps - ✔✔False
✔✔What kinds of drawings are most functional for exact specifications and installation?
- ✔✔isometric
✔✔ASTM A-58-F pipe. What does the F mean? - ✔✔Furnace welded
✔✔A journey plumber can work on a hot water heater boiler without a boiler license so
long as it doesn't exceed _______ btuh per hour. - ✔✔750000
✔✔Amount of weld reinforcement is determined by ________ of the metal. -
✔✔thickness
✔✔When welding on a boiler piping system, how many welders need to have a class 5
license? - ✔✔None
✔✔A device whose function is to prevent excess generation of steam and maintain the
required pressure at a safe limit of a steam boiler is called _________ _________. -
✔✔pressure control
✔✔A device put on a steam line and on the outlet of a heating unit to prevent exit of
condensate is called? - ✔✔steam trap/air vent
✔✔t/f Slip on flanges must be welded inside and out on category M piping. - ✔✔true
✔✔Which drawing best shows how a piping system is assembled? - ✔✔isometric
✔✔t/f It is permissible to install one safety valve for multiple pressure vessels. - ✔✔false
✔✔t/f Cold springing is allowed for aligning pipe on refrigeration piping. ASME B31.5 -
✔✔True
WITH ANSWERS GRADED A+
✔✔t/f All cast iron boilers shall be provided with a wash out opening which is not smaller
than 1 1/2 nps - ✔✔False
✔✔Which non destructive examination method best reveals lack of fusion in a finished
weld? - ✔✔Radiography
✔✔Steam boilers operated at 10 psig are required to be constructed under which ASME
code? - ✔✔Section IV
✔✔Hot H2O heating and hot H2O supply boilers must be tested at a pressure of -
✔✔1.5 mawp
✔✔Which of the following provides information required to make sound welds for ASME
service? - ✔✔the engineered working drawings or PQR
✔✔Heat numbers are to be transferred ________ to cutting any material. - ✔✔Prior
✔✔Before entering a boiler or pressure vessel: - ✔✔company confined space
procedures are followed.
✔✔t/f Ammonia piping installation falls under the state boiler safety program. - ✔✔False
✔✔In addition to visual examination for A3 & A4 refrigerant piping, at least _______ of
the circumferential but and miter groove piping must be examined by random
radiography. - ✔✔5%
✔✔The max temp and pressure for cast iron fittings that may be used on a code boiler
is - ✔✔250-450
✔✔t/f Slag inclusions on ASME code pipe must always be removed? - ✔✔False
✔✔Which of the following gases can be used as shielding gas for gmaw? - ✔✔Carbon
dioxide
✔✔t/f Tack welds must use a qualified weld procedure - ✔✔true
✔✔A blueprint solid line with an arrow is a _______ ________. - ✔✔Dimension line
✔✔Fire extinguisher chemical agent to put out class C fires - ✔✔CO2
, ✔✔Electric boilers must meet ________ - ✔✔CSD1
✔✔How much pressure is in an inch of water column - ✔✔.036
✔✔How many low water cutoffs are required for steam boilers < 15 psig? - ✔✔2
✔✔Building Service Steam Piping operates at a pressure no less than _______ -
✔✔150
✔✔t/f Washout openings on cast iron shall be no smaller than 1.5" nps - ✔✔False
✔✔What kinds of drawings are most functional for exact specifications and installation?
- ✔✔isometric
✔✔ASTM A-58-F pipe. What does the F mean? - ✔✔Furnace welded
✔✔A journey plumber can work on a hot water heater boiler without a boiler license so
long as it doesn't exceed _______ btuh per hour. - ✔✔750000
✔✔Amount of weld reinforcement is determined by ________ of the metal. -
✔✔thickness
✔✔When welding on a boiler piping system, how many welders need to have a class 5
license? - ✔✔None
✔✔A device whose function is to prevent excess generation of steam and maintain the
required pressure at a safe limit of a steam boiler is called _________ _________. -
✔✔pressure control
✔✔A device put on a steam line and on the outlet of a heating unit to prevent exit of
condensate is called? - ✔✔steam trap/air vent
✔✔t/f Slip on flanges must be welded inside and out on category M piping. - ✔✔true
✔✔Which drawing best shows how a piping system is assembled? - ✔✔isometric
✔✔t/f It is permissible to install one safety valve for multiple pressure vessels. - ✔✔false
✔✔t/f Cold springing is allowed for aligning pipe on refrigeration piping. ASME B31.5 -
✔✔True
