Massachusetts Journeyman Pipefitter License
Exam 2026-2027 — Original Practice Questions
1. When installing a hydronic heating system, where should the
circulator pump be located relative to the expansion tank to ensure
stable pressure and proper air elimination?
A. On the return side, upstream of the expansion tank connection
B. On the supply side, pumping away from the expansion tank connection
C. At the lowest point in the system, regardless of expansion tank location
D. Directly adjacent to the boiler, regardless of expansion tank location
B. On the supply side, pumping away from the expansion tank
connection
Locating the circulator so that it pumps away from the expansion tank
connection establishes a stable pressure relationship and improves air
elimination, reducing the tendency for dissolved air to come out of solution .
2. What is the primary consequence of installing a control valve
backwards relative to the manufacturer's indicated flow direction?
A. Improved valve capacity and reduced noise
B. Automatic pressure reduction and elimination of water hammer
C. Potential malfunction, excessive noise, or damage to the valve
D. No consequence, as control valves are bidirectional
C. Potential malfunction, excessive noise, or damage to the valve
,Many control valves are designed for a specific flow direction. Reversing flow
can cause unstable operation, cavitation, noise, or premature component
failure .
3. Which condition most strongly indicates cavitation at a centrifugal
pump?
A. Smooth operation with reduced temperature
B. A gravel-like sound accompanied by vibration
C. Increased suction pressure and silent operation
D. Decreased discharge pressure with no noise
B. A gravel-like sound accompanied by vibration
Cavitation produces a characteristic gravel-like sound and vibration as vapor
bubbles collapse, which can damage the pump impeller over time .
4. In a closed hydronic system, repeated pressure relief valve discharge
occurs even though the boiler operating temperature is normal. Which
condition is the most likely cause?
A. Oversized circulator pump
B. Waterlogged or improperly charged expansion tank
C. Excessive pipe insulation
D. Undersized return piping
B. Waterlogged or improperly charged expansion tank
,A failed or improperly charged expansion tank cannot adequately absorb
thermal expansion, causing system pressure to rise until the relief valve opens
.
5. A steam main is producing water hammer shortly after startup.
Which correction is most appropriate?
A. Increase steam velocity
B. Remove main-line drip legs
C. Verify adequate main pitch and properly functioning traps
D. Reduce insulation thickness
C. Verify adequate main pitch and properly functioning traps
Water hammer commonly results from condensate accumulation. Proper
pitch, drip legs, and functioning traps remove condensate from the steam
main .
6. Which welding process is commonly selected for high-quality pipe
welding where precise heat control and clean welds are required?
A. GTAW (Gas Tungsten Arc Welding)
B. SAW (Submerged Arc Welding) exclusively
C. Oxy-fuel brazing only
D. Mechanical threading
A. GTAW (Gas Tungsten Arc Welding)
, Gas tungsten arc welding provides excellent control of the arc and heat input
and is widely used where high-quality pipe welds are required .
7. A piping system is designed to accommodate thermal expansion
through expansion loops. What is the primary purpose of the loop?
A. Increase fluid velocity
B. Provide controlled flexibility
C. Eliminate the need for supports
D. Increase system pressure
B. Provide controlled flexibility
Expansion loops absorb thermal movement by flexing the piping while
limiting excessive stress on equipment and joints .
8. What is the primary reason for properly sizing a steam condensate
return line in a gravity-return system?
A. To increase steam pressure
B. To prevent condensate backup and water hammer
C. To reduce pipe insulation requirements
D. To increase steam velocity
B. To prevent condensate backup and water hammer
Exam 2026-2027 — Original Practice Questions
1. When installing a hydronic heating system, where should the
circulator pump be located relative to the expansion tank to ensure
stable pressure and proper air elimination?
A. On the return side, upstream of the expansion tank connection
B. On the supply side, pumping away from the expansion tank connection
C. At the lowest point in the system, regardless of expansion tank location
D. Directly adjacent to the boiler, regardless of expansion tank location
B. On the supply side, pumping away from the expansion tank
connection
Locating the circulator so that it pumps away from the expansion tank
connection establishes a stable pressure relationship and improves air
elimination, reducing the tendency for dissolved air to come out of solution .
2. What is the primary consequence of installing a control valve
backwards relative to the manufacturer's indicated flow direction?
A. Improved valve capacity and reduced noise
B. Automatic pressure reduction and elimination of water hammer
C. Potential malfunction, excessive noise, or damage to the valve
D. No consequence, as control valves are bidirectional
C. Potential malfunction, excessive noise, or damage to the valve
,Many control valves are designed for a specific flow direction. Reversing flow
can cause unstable operation, cavitation, noise, or premature component
failure .
3. Which condition most strongly indicates cavitation at a centrifugal
pump?
A. Smooth operation with reduced temperature
B. A gravel-like sound accompanied by vibration
C. Increased suction pressure and silent operation
D. Decreased discharge pressure with no noise
B. A gravel-like sound accompanied by vibration
Cavitation produces a characteristic gravel-like sound and vibration as vapor
bubbles collapse, which can damage the pump impeller over time .
4. In a closed hydronic system, repeated pressure relief valve discharge
occurs even though the boiler operating temperature is normal. Which
condition is the most likely cause?
A. Oversized circulator pump
B. Waterlogged or improperly charged expansion tank
C. Excessive pipe insulation
D. Undersized return piping
B. Waterlogged or improperly charged expansion tank
,A failed or improperly charged expansion tank cannot adequately absorb
thermal expansion, causing system pressure to rise until the relief valve opens
.
5. A steam main is producing water hammer shortly after startup.
Which correction is most appropriate?
A. Increase steam velocity
B. Remove main-line drip legs
C. Verify adequate main pitch and properly functioning traps
D. Reduce insulation thickness
C. Verify adequate main pitch and properly functioning traps
Water hammer commonly results from condensate accumulation. Proper
pitch, drip legs, and functioning traps remove condensate from the steam
main .
6. Which welding process is commonly selected for high-quality pipe
welding where precise heat control and clean welds are required?
A. GTAW (Gas Tungsten Arc Welding)
B. SAW (Submerged Arc Welding) exclusively
C. Oxy-fuel brazing only
D. Mechanical threading
A. GTAW (Gas Tungsten Arc Welding)
, Gas tungsten arc welding provides excellent control of the arc and heat input
and is widely used where high-quality pipe welds are required .
7. A piping system is designed to accommodate thermal expansion
through expansion loops. What is the primary purpose of the loop?
A. Increase fluid velocity
B. Provide controlled flexibility
C. Eliminate the need for supports
D. Increase system pressure
B. Provide controlled flexibility
Expansion loops absorb thermal movement by flexing the piping while
limiting excessive stress on equipment and joints .
8. What is the primary reason for properly sizing a steam condensate
return line in a gravity-return system?
A. To increase steam pressure
B. To prevent condensate backup and water hammer
C. To reduce pipe insulation requirements
D. To increase steam velocity
B. To prevent condensate backup and water hammer
