Connecticut Heating, Piping and Cooling
Unlimited Journeyperson Exam Practice
Questions And Correct Answers (Verified
Answers) Plus Rationales | Instant
Download Pdf
Practice Question Bank & Answer Rationale
THIS PACK CONTAINS
150 exam-style multiple-choice questions. Each question includes the correct answer and a complete
rationale for focused revision.
COVERAGE
This exam preparation covers the Connecticut Unlimited Journeyperson certification, focusing on code
compliance, system design, safety, and practical application for heating, piping, and cooling systems. It
includes questions on load calculations, piping materials, refrigerant handling, controls, and energy efficiency.
STUDY GUIDE
Recommended duration: 3 hours. Passing target: 75%.
HIGHP - Page 1 of 50
,1. When sizing a natural gas piping system for a residential furnace, which factor most
directly determines the minimum pipe diameter required for a given length and pressure
drop?
[ ] A. The specific gravity of the gas and the total equivalent length of piping
[ ] B. The heating value of the gas and the furnace efficiency
[ ] C. The ambient temperature and the pipe material
[ ] D. The number of fittings and the pipe insulation thickness
CORRECT: A. The specific gravity of the gas and the total equivalent length of piping
Pipe sizing for gas depends on gas specific gravity, total equivalent length (including fittings), and allowable
pressure drop. Heating value affects consumption but not pipe diameter directly; efficiency and insulation are
unrelated to flow capacity.
2. A hydronic heating system uses a compression tank. If the tank is waterlogged, which
symptom is most likely to occur?
[ ] A. Excessive pressure fluctuations and relief valve discharge
[ ] B. Increased boiler efficiency due to reduced air
[ ] C. Lower water temperature at the boiler outlet
[ ] D. Reduced pump head and increased flow rate
CORRECT: A. Excessive pressure fluctuations and relief valve discharge
A waterlogged compression tank loses its air cushion, causing pressure to rise rapidly with temperature and
forcing the relief valve to discharge. Efficiency and flow are not directly improved; pump head may increase,
not decrease.
3. Under Connecticut code, what is the minimum required clearance between a chimney
connector and combustible materials for a low-heat appliance?
[ ] A. 6 inches
[ ] B. 9 inches
[ ] C. 12 inches
[ ] D. 18 inches
CORRECT: B. 9 inches
NFPA 211 and Connecticut code require 9 inches clearance for low-heat appliances unless a listed thimble or
ventilated shield is used. Other values are either too small or apply to higher-heat appliances.
4. In a refrigerant system, which component is responsible for raising the refrigerant
pressure and temperature from the evaporator to the condenser?
[ ] A. Expansion valve
[ ] B. Compressor
HIGHP - Page 2 of 50
, [ ] C. Condenser
[ ] D. Evaporator
CORRECT: B. Compressor
The compressor increases refrigerant pressure and temperature, enabling heat rejection in the condenser.
The expansion valve reduces pressure; condenser and evaporator facilitate heat transfer but do not raise
pressure.
5. When installing a forced-air furnace in a garage, which safety measure is required by
Connecticut code to prevent ignition of gasoline vapors?
[ ] A. Elevate the furnace so the ignition source is at least 18 inches above the floor
[ ] B. Install a carbon monoxide detector adjacent to the furnace
[ ] C. Provide a dedicated outdoor air intake for combustion
[ ] D. Use a spark-arresting burner head
CORRECT: A. Elevate the furnace so the ignition source is at least 18 inches above the floor
Code requires ignition sources in garages to be elevated at least 18 inches to avoid flammable vapors. CO
detectors and outdoor air are good practices but not the specific requirement; spark arrestors are for solid
fuel.
6. Which of the following best describes the purpose of a balancing valve in a hydronic
system?
[ ] A. To regulate flow to individual circuits and achieve design water flow rates
[ ] B. To automatically maintain a constant differential pressure across the pump
[ ] C. To isolate the pump for maintenance without draining the system
[ ] D. To prevent backflow of water into the domestic supply
CORRECT: A. To regulate flow to individual circuits and achieve design water flow rates
Balancing valves adjust flow resistance to match design flow in each circuit. Differential pressure control is
done by a separate valve; isolation is by gate/ball valves; backflow prevention is a separate device.
7. A technician is brazing copper refrigerant lines. Which practice is essential to prevent
oxidation and scale inside the tubing?
[ ] A. Purge the line with nitrogen during brazing
[ ] B. Use a high-temperature flux on the outside of the joint
[ ] C. Cool the joint rapidly with water after brazing
[ ] D. Apply flux inside the tubing before assembly
CORRECT: A. Purge the line with nitrogen during brazing
Nitrogen purging displaces oxygen, preventing cupric oxide formation inside the tubing. Flux is not used in
HIGHP - Page 3 of 50
, refrigerant lines; rapid cooling can crack the joint; internal flux would contaminate the system.
8. In a steam heating system, what is the primary function of a Hartford loop?
[ ] A. To prevent water from siphoning out of the boiler during a low-water condition
[ ] B. To automatically add makeup water to the boiler
[ ] C. To regulate steam pressure to the radiators
[ ] D. To separate air from steam in the mains
CORRECT: A. To prevent water from siphoning out of the boiler during a low-water condition
The Hartford loop equalizes pressure and prevents boiler water from draining out through a broken return
line. Makeup water is handled by a feeder; pressure regulation is by a pressuretrol; air separation is by main
vents.
9. According to ASHRAE Standard 62.1, what is the primary purpose of outdoor air
ventilation in commercial buildings?
[ ] A. To dilute indoor contaminants and maintain acceptable indoor air quality
[ ] B. To reduce heating and cooling energy consumption
[ ] C. To pressurize the building to prevent infiltration
[ ] D. To provide combustion air for fuel-burning appliances
CORRECT: A. To dilute indoor contaminants and maintain acceptable indoor air quality
Standard 62.1 sets minimum ventilation rates to dilute contaminants and protect occupant health. Energy
reduction and pressurization are not the primary intent; combustion air is covered by other codes.
10. When performing a load calculation using Manual J, which factor has the greatest
impact on the calculated heating load?
[ ] A. Outdoor design temperature and indoor design temperature difference
[ ] B. Number of occupants and their activity level
[ ] C. Internal gains from appliances and lighting
[ ] D. Solar heat gain through windows
CORRECT: A. Outdoor design temperature and indoor design temperature difference
Heating load is dominated by transmission losses driven by the temperature difference between indoors and
outdoors. Occupants, internal gains, and solar gain are more significant for cooling loads.
11. A commercial hydronic system uses a compression tank (expansion tank) connected
at the suction side of the circulator. The system volume is 800 gallons, the temperature
swing is 60°F to 200°F, and the tank's acceptance volume must accommodate the
HIGHP - Page 4 of 50
Unlimited Journeyperson Exam Practice
Questions And Correct Answers (Verified
Answers) Plus Rationales | Instant
Download Pdf
Practice Question Bank & Answer Rationale
THIS PACK CONTAINS
150 exam-style multiple-choice questions. Each question includes the correct answer and a complete
rationale for focused revision.
COVERAGE
This exam preparation covers the Connecticut Unlimited Journeyperson certification, focusing on code
compliance, system design, safety, and practical application for heating, piping, and cooling systems. It
includes questions on load calculations, piping materials, refrigerant handling, controls, and energy efficiency.
STUDY GUIDE
Recommended duration: 3 hours. Passing target: 75%.
HIGHP - Page 1 of 50
,1. When sizing a natural gas piping system for a residential furnace, which factor most
directly determines the minimum pipe diameter required for a given length and pressure
drop?
[ ] A. The specific gravity of the gas and the total equivalent length of piping
[ ] B. The heating value of the gas and the furnace efficiency
[ ] C. The ambient temperature and the pipe material
[ ] D. The number of fittings and the pipe insulation thickness
CORRECT: A. The specific gravity of the gas and the total equivalent length of piping
Pipe sizing for gas depends on gas specific gravity, total equivalent length (including fittings), and allowable
pressure drop. Heating value affects consumption but not pipe diameter directly; efficiency and insulation are
unrelated to flow capacity.
2. A hydronic heating system uses a compression tank. If the tank is waterlogged, which
symptom is most likely to occur?
[ ] A. Excessive pressure fluctuations and relief valve discharge
[ ] B. Increased boiler efficiency due to reduced air
[ ] C. Lower water temperature at the boiler outlet
[ ] D. Reduced pump head and increased flow rate
CORRECT: A. Excessive pressure fluctuations and relief valve discharge
A waterlogged compression tank loses its air cushion, causing pressure to rise rapidly with temperature and
forcing the relief valve to discharge. Efficiency and flow are not directly improved; pump head may increase,
not decrease.
3. Under Connecticut code, what is the minimum required clearance between a chimney
connector and combustible materials for a low-heat appliance?
[ ] A. 6 inches
[ ] B. 9 inches
[ ] C. 12 inches
[ ] D. 18 inches
CORRECT: B. 9 inches
NFPA 211 and Connecticut code require 9 inches clearance for low-heat appliances unless a listed thimble or
ventilated shield is used. Other values are either too small or apply to higher-heat appliances.
4. In a refrigerant system, which component is responsible for raising the refrigerant
pressure and temperature from the evaporator to the condenser?
[ ] A. Expansion valve
[ ] B. Compressor
HIGHP - Page 2 of 50
, [ ] C. Condenser
[ ] D. Evaporator
CORRECT: B. Compressor
The compressor increases refrigerant pressure and temperature, enabling heat rejection in the condenser.
The expansion valve reduces pressure; condenser and evaporator facilitate heat transfer but do not raise
pressure.
5. When installing a forced-air furnace in a garage, which safety measure is required by
Connecticut code to prevent ignition of gasoline vapors?
[ ] A. Elevate the furnace so the ignition source is at least 18 inches above the floor
[ ] B. Install a carbon monoxide detector adjacent to the furnace
[ ] C. Provide a dedicated outdoor air intake for combustion
[ ] D. Use a spark-arresting burner head
CORRECT: A. Elevate the furnace so the ignition source is at least 18 inches above the floor
Code requires ignition sources in garages to be elevated at least 18 inches to avoid flammable vapors. CO
detectors and outdoor air are good practices but not the specific requirement; spark arrestors are for solid
fuel.
6. Which of the following best describes the purpose of a balancing valve in a hydronic
system?
[ ] A. To regulate flow to individual circuits and achieve design water flow rates
[ ] B. To automatically maintain a constant differential pressure across the pump
[ ] C. To isolate the pump for maintenance without draining the system
[ ] D. To prevent backflow of water into the domestic supply
CORRECT: A. To regulate flow to individual circuits and achieve design water flow rates
Balancing valves adjust flow resistance to match design flow in each circuit. Differential pressure control is
done by a separate valve; isolation is by gate/ball valves; backflow prevention is a separate device.
7. A technician is brazing copper refrigerant lines. Which practice is essential to prevent
oxidation and scale inside the tubing?
[ ] A. Purge the line with nitrogen during brazing
[ ] B. Use a high-temperature flux on the outside of the joint
[ ] C. Cool the joint rapidly with water after brazing
[ ] D. Apply flux inside the tubing before assembly
CORRECT: A. Purge the line with nitrogen during brazing
Nitrogen purging displaces oxygen, preventing cupric oxide formation inside the tubing. Flux is not used in
HIGHP - Page 3 of 50
, refrigerant lines; rapid cooling can crack the joint; internal flux would contaminate the system.
8. In a steam heating system, what is the primary function of a Hartford loop?
[ ] A. To prevent water from siphoning out of the boiler during a low-water condition
[ ] B. To automatically add makeup water to the boiler
[ ] C. To regulate steam pressure to the radiators
[ ] D. To separate air from steam in the mains
CORRECT: A. To prevent water from siphoning out of the boiler during a low-water condition
The Hartford loop equalizes pressure and prevents boiler water from draining out through a broken return
line. Makeup water is handled by a feeder; pressure regulation is by a pressuretrol; air separation is by main
vents.
9. According to ASHRAE Standard 62.1, what is the primary purpose of outdoor air
ventilation in commercial buildings?
[ ] A. To dilute indoor contaminants and maintain acceptable indoor air quality
[ ] B. To reduce heating and cooling energy consumption
[ ] C. To pressurize the building to prevent infiltration
[ ] D. To provide combustion air for fuel-burning appliances
CORRECT: A. To dilute indoor contaminants and maintain acceptable indoor air quality
Standard 62.1 sets minimum ventilation rates to dilute contaminants and protect occupant health. Energy
reduction and pressurization are not the primary intent; combustion air is covered by other codes.
10. When performing a load calculation using Manual J, which factor has the greatest
impact on the calculated heating load?
[ ] A. Outdoor design temperature and indoor design temperature difference
[ ] B. Number of occupants and their activity level
[ ] C. Internal gains from appliances and lighting
[ ] D. Solar heat gain through windows
CORRECT: A. Outdoor design temperature and indoor design temperature difference
Heating load is dominated by transmission losses driven by the temperature difference between indoors and
outdoors. Occupants, internal gains, and solar gain are more significant for cooling loads.
11. A commercial hydronic system uses a compression tank (expansion tank) connected
at the suction side of the circulator. The system volume is 800 gallons, the temperature
swing is 60°F to 200°F, and the tank's acceptance volume must accommodate the
HIGHP - Page 4 of 50
