MICHIGAN BOILER INSTALLER 2B PRACTICE EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
1. What is the maximum allowable working pressure (MAWP) for a low-
pressure steam boiler under ASME Section IV?
A. 30 psi
B. 15 psi
C. 50 psi
D. 100 psi
Rationale: ASME Section IV defines low-pressure steam boilers as those not
exceeding 15 psi steam pressure._
2. What is the MAWP for a low-pressure hot-water heating boiler?
A. 15 psi
B. 100 psi
C. 160 psi
D. 250 psi
Rationale: Hot-water heating boilers are limited to 160 psi and 250°F under
ASME Section IV._
3. The minimum size of a safety valve outlet for a low-pressure steam boiler is
determined by:
A. Manufacturer’s discretion
B. Boiler heating surface area and relief capacity
C. Number of burners
D. Stack temperature
,Rationale: The safety valve outlet is sized to relieve full steam generation safely
based on heating surface._
4. When installing a hot-water boiler, the expansion tank must be:
A. Located in the flue vent
B. Installed downstream of the pressure-reducing valve
C. Connected on the suction side of the circulator pump
D. Mounted directly on the relief valve
Rationale: Proper connection ensures pressure stability and avoids pump
cavitation._
5. What is the purpose of a Hartford loop on a steam boiler?
A. To control water temperature
B. To prevent air infiltration
C. To prevent loss of water from the boiler in case of return line leak
D. To balance condensate flow
Rationale: The Hartford loop maintains boiler water level in case of condensate
return failure._
6. What must be provided at the lowest point of a boiler system for
maintenance?
A. Test gauge
B. Pressure switch
C. Blow-off valve
D. Stop valve
Rationale: Blow-off valves allow removal of sludge and sediment from the
lowest point._
7. The Michigan Boiler Code adopts inspection requirements from:
, A. EPA
B. ASHRAE
C. National Board Inspection Code (NBIC)
D. NEC
Rationale: Michigan follows NBIC for inspection, repair, and installation
standards._
8. A low-pressure boiler relief valve must be tested:
A. Annually
B. Monthly
C. At installation and during each inspection
D. Only when pressure is low
Rationale: Testing ensures the valve opens at set pressure per inspection
requirements._
9. The minimum clearance from the top of a low-pressure boiler to the ceiling is:
A. 24 inches
B. 12 inches
C. 6 inches
D. 36 inches
Rationale: Michigan rules require 24-inch clearance for safe access and
ventilation._
10. What type of piping material is prohibited for steam boiler blow-off lines?
A. Steel
B. Copper
C. PVC or plastic
D. Brass
Rationale: Plastic materials cannot withstand high temperatures and pressure._
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
1. What is the maximum allowable working pressure (MAWP) for a low-
pressure steam boiler under ASME Section IV?
A. 30 psi
B. 15 psi
C. 50 psi
D. 100 psi
Rationale: ASME Section IV defines low-pressure steam boilers as those not
exceeding 15 psi steam pressure._
2. What is the MAWP for a low-pressure hot-water heating boiler?
A. 15 psi
B. 100 psi
C. 160 psi
D. 250 psi
Rationale: Hot-water heating boilers are limited to 160 psi and 250°F under
ASME Section IV._
3. The minimum size of a safety valve outlet for a low-pressure steam boiler is
determined by:
A. Manufacturer’s discretion
B. Boiler heating surface area and relief capacity
C. Number of burners
D. Stack temperature
,Rationale: The safety valve outlet is sized to relieve full steam generation safely
based on heating surface._
4. When installing a hot-water boiler, the expansion tank must be:
A. Located in the flue vent
B. Installed downstream of the pressure-reducing valve
C. Connected on the suction side of the circulator pump
D. Mounted directly on the relief valve
Rationale: Proper connection ensures pressure stability and avoids pump
cavitation._
5. What is the purpose of a Hartford loop on a steam boiler?
A. To control water temperature
B. To prevent air infiltration
C. To prevent loss of water from the boiler in case of return line leak
D. To balance condensate flow
Rationale: The Hartford loop maintains boiler water level in case of condensate
return failure._
6. What must be provided at the lowest point of a boiler system for
maintenance?
A. Test gauge
B. Pressure switch
C. Blow-off valve
D. Stop valve
Rationale: Blow-off valves allow removal of sludge and sediment from the
lowest point._
7. The Michigan Boiler Code adopts inspection requirements from:
, A. EPA
B. ASHRAE
C. National Board Inspection Code (NBIC)
D. NEC
Rationale: Michigan follows NBIC for inspection, repair, and installation
standards._
8. A low-pressure boiler relief valve must be tested:
A. Annually
B. Monthly
C. At installation and during each inspection
D. Only when pressure is low
Rationale: Testing ensures the valve opens at set pressure per inspection
requirements._
9. The minimum clearance from the top of a low-pressure boiler to the ceiling is:
A. 24 inches
B. 12 inches
C. 6 inches
D. 36 inches
Rationale: Michigan rules require 24-inch clearance for safe access and
ventilation._
10. What type of piping material is prohibited for steam boiler blow-off lines?
A. Steel
B. Copper
C. PVC or plastic
D. Brass
Rationale: Plastic materials cannot withstand high temperatures and pressure._
