NYC DCAS Supervisor Steamfitter Examination
Exam Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026 Q&A|
Instant Download Pdf
1. In a high-pressure steam distribution system serving multiple
municipal buildings, a supervisor observes that condensate is
accumulating in a main header despite steam traps being installed at
designated low points. Which condition is the most likely cause of the
problem?
A. Excessive boiler blowdown
B. Properly functioning thermostatic traps
C. Failed steam traps stuck in the closed position
D. Increased condensate return temperature
C. Failed steam traps stuck in the closed position
A steam trap that fails closed prevents condensate removal, allowing
water accumulation in steam mains. This condition can result in water
hammer, reduced heat transfer efficiency, and potential damage to piping
systems.
2. A steamfitter supervisor reviewing a piping installation notices that a
horizontal steam main lacks sufficient pitch. What is the primary
purpose of pitching steam mains?
A. To increase steam pressure
B. To facilitate condensate drainage
,C. To reduce pipe expansion
D. To improve insulation performance
B. To facilitate condensate drainage
Steam mains are pitched so that condensate naturally flows toward
designated drainage points and steam traps. Proper drainage minimizes
water hammer and maintains efficient steam distribution.
3. During an inspection of a boiler room, a supervisor discovers that a
safety relief valve has been isolated from the boiler by a closed shutoff
valve. What is the greatest concern?
A. Increased fuel consumption
B. Reduced condensate return
C. Inability of the safety valve to relieve excess pressure
D. Improper feedwater chemistry
C. Inability of the safety valve to relieve excess pressure
Safety relief valves must remain capable of directly relieving excess
pressure from the boiler. Isolation of the valve creates a potentially
catastrophic overpressure hazard.
4. What is the primary function of a steam separator installed in a steam
distribution system?
A. To increase steam temperature
B. To remove moisture from steam
C. To increase boiler efficiency by reducing fuel input
D. To regulate steam pressure
B. To remove moisture from steam
,Steam separators remove entrained water droplets from steam, improving
steam quality, enhancing heat transfer, and protecting downstream
equipment.
5. A supervisor must determine whether a pressure gauge is suitable for
a steam line operating at 100 psi. Which gauge range is generally most
appropriate?
A. 0–50 psi
B. 0–100 psi
C. 0–200 psi
D. 0–1000 psi
C. 0–200 psi
Pressure gauges are typically selected so normal operating pressure falls
near the middle portion of the scale. A 0–200 psi gauge provides accurate
readings while avoiding excessive strain.
6. Which device is specifically designed to remove non-condensable
gases from a steam system while retaining steam?
A. Pressure reducing valve
B. Air vent
C. Globe valve
D. Backflow preventer
B. Air vent
Air vents discharge air and other non-condensable gases, which can
impede heat transfer and reduce system efficiency.
7. When supervising welding operations on steam piping, what is the
most important reason for following qualified welding procedures?
, A. To reduce labor costs
B. To maintain pipe appearance
C. To ensure structural integrity and code compliance
D. To simplify future insulation work
C. To ensure structural integrity and code compliance
Qualified procedures help produce sound welds capable of withstanding
operating pressures and temperatures while meeting applicable codes and
standards.
8. Water hammer in a steam system most commonly results from:
A. Excessive insulation thickness
B. Condensate accumulation in steam piping
C. High feedwater temperature
D. Low boiler pressure
B. Condensate accumulation in steam piping
When steam rapidly contacts accumulated condensate, pressure forces can
create violent shock waves known as water hammer.
9. What is the primary purpose of boiler blowdown?
A. Increase steam pressure
B. Remove dissolved and suspended solids
C. Increase condensate return rate
D. Reduce combustion air
B. Remove dissolved and suspended solids
Boiler blowdown controls water chemistry by removing impurities that
could otherwise cause scaling, corrosion, or carryover.
10. A supervisor assigning personnel to confined-space work must
ensure that:
Exam Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026 Q&A|
Instant Download Pdf
1. In a high-pressure steam distribution system serving multiple
municipal buildings, a supervisor observes that condensate is
accumulating in a main header despite steam traps being installed at
designated low points. Which condition is the most likely cause of the
problem?
A. Excessive boiler blowdown
B. Properly functioning thermostatic traps
C. Failed steam traps stuck in the closed position
D. Increased condensate return temperature
C. Failed steam traps stuck in the closed position
A steam trap that fails closed prevents condensate removal, allowing
water accumulation in steam mains. This condition can result in water
hammer, reduced heat transfer efficiency, and potential damage to piping
systems.
2. A steamfitter supervisor reviewing a piping installation notices that a
horizontal steam main lacks sufficient pitch. What is the primary
purpose of pitching steam mains?
A. To increase steam pressure
B. To facilitate condensate drainage
,C. To reduce pipe expansion
D. To improve insulation performance
B. To facilitate condensate drainage
Steam mains are pitched so that condensate naturally flows toward
designated drainage points and steam traps. Proper drainage minimizes
water hammer and maintains efficient steam distribution.
3. During an inspection of a boiler room, a supervisor discovers that a
safety relief valve has been isolated from the boiler by a closed shutoff
valve. What is the greatest concern?
A. Increased fuel consumption
B. Reduced condensate return
C. Inability of the safety valve to relieve excess pressure
D. Improper feedwater chemistry
C. Inability of the safety valve to relieve excess pressure
Safety relief valves must remain capable of directly relieving excess
pressure from the boiler. Isolation of the valve creates a potentially
catastrophic overpressure hazard.
4. What is the primary function of a steam separator installed in a steam
distribution system?
A. To increase steam temperature
B. To remove moisture from steam
C. To increase boiler efficiency by reducing fuel input
D. To regulate steam pressure
B. To remove moisture from steam
,Steam separators remove entrained water droplets from steam, improving
steam quality, enhancing heat transfer, and protecting downstream
equipment.
5. A supervisor must determine whether a pressure gauge is suitable for
a steam line operating at 100 psi. Which gauge range is generally most
appropriate?
A. 0–50 psi
B. 0–100 psi
C. 0–200 psi
D. 0–1000 psi
C. 0–200 psi
Pressure gauges are typically selected so normal operating pressure falls
near the middle portion of the scale. A 0–200 psi gauge provides accurate
readings while avoiding excessive strain.
6. Which device is specifically designed to remove non-condensable
gases from a steam system while retaining steam?
A. Pressure reducing valve
B. Air vent
C. Globe valve
D. Backflow preventer
B. Air vent
Air vents discharge air and other non-condensable gases, which can
impede heat transfer and reduce system efficiency.
7. When supervising welding operations on steam piping, what is the
most important reason for following qualified welding procedures?
, A. To reduce labor costs
B. To maintain pipe appearance
C. To ensure structural integrity and code compliance
D. To simplify future insulation work
C. To ensure structural integrity and code compliance
Qualified procedures help produce sound welds capable of withstanding
operating pressures and temperatures while meeting applicable codes and
standards.
8. Water hammer in a steam system most commonly results from:
A. Excessive insulation thickness
B. Condensate accumulation in steam piping
C. High feedwater temperature
D. Low boiler pressure
B. Condensate accumulation in steam piping
When steam rapidly contacts accumulated condensate, pressure forces can
create violent shock waves known as water hammer.
9. What is the primary purpose of boiler blowdown?
A. Increase steam pressure
B. Remove dissolved and suspended solids
C. Increase condensate return rate
D. Reduce combustion air
B. Remove dissolved and suspended solids
Boiler blowdown controls water chemistry by removing impurities that
could otherwise cause scaling, corrosion, or carryover.
10. A supervisor assigning personnel to confined-space work must
ensure that:
