Ohio OH Hydronics Contractor Practice Exam 1000

Ohio (OH) Hydronics Contractor Practice Exam 1000 Questions and Answers Best rated A+ Guaranteed Success Latest Update

• Which of the following is the primary purpose of a hydronic heating system?
• Convert electrical energy to heat
• Circulate air through ducts
• Circulate heated water to radiators or heat exchangers
• Generate steam for turbines

Rationale: Hydronic systems use water or other fluids to transfer heat to radiators or baseboards.It is not an air-based system or electrical heating.

• In Ohio, a hydronics contractor must comply with which code for

installations?

• National Electrical Code only
• Ohio Plumbing Code and applicable building codes
• International Fire Code only
• ASME B31.1 only

Rationale: Ohio hydronics contractors follow the Ohio Plumbing Code and local building codes for installation and safety compliance.

• What is the main function of an expansion tank in a closed hydronic system?
• Filter the water
• Heat the water
• Pump water through the system
• Absorb pressure changes to prevent system damage

Rationale: Expansion tanks accommodate thermal expansion of water and prevent excessive pressure in closed systems.

• / 4

• Which type of pump is most commonly used in residential hydronic systems?
• Centrifugal booster pump
• Gear pump
• Circulator pump
• Diaphragm pump

Rationale: Circulator pumps are designed to move water efficiently through residential heating loops.

• When installing a hydronic boiler, which of the following is critical for safety?
• Installing only PVC pipes
• Avoiding insulation on pipes
• Proper venting and pressure relief valves
• Using only copper tubing

Rationale: Proper venting prevents carbon monoxide buildup, and pressure relief valves prevent overpressure, which are essential for safe operation.

• What is “pitting” in hydronic systems?
• Formation of bubbles
• Localized corrosion on metal surfaces
• Accumulation of dirt in the pump
• Air trapped in radiators

Rationale: Pitting is a form of corrosion that can cause leaks in metal pipes and boilers.

• Which fluid is typically used in a residential hydronic heating system?
• Propane
• Ethylene gas
• Water, sometimes mixed with antifreeze
• Compressed air

Rationale: Water is the standard heat transfer medium; glycol or other antifreeze is added in colder climates to prevent freezing.

• / 4

• How often should a hydronic system be flushed to remove sediment?
• Every month
• Every 3–5 years
• Every 10 years
• Never

Rationale: Flushing every 3–5 years helps maintain efficiency and prevent corrosion or blockages.

• Which valve type is typically used to balance flow in a hydronic system?
• Gate valve
• Ball valve
• Balancing valve
• Check valve

Rationale: Balancing valves allow precise control of water flow to maintain even heating throughout the system.

• What is the minimum allowable pipe slope for a hydronic boiler condensate

drain?

• 1/8 inch per foot
• 1/2 inch per foot
• 1/4 inch per foot
• Level (no slope)

Rationale: Proper slope ensures gravity drainage of condensate, preventing accumulation that could damage the boiler.

• Which is a common symptom of air trapped in a hydronic system?
• High water pressure
• Boiler overheating
• Gurgling noises in radiators
• Pump failure

Rationale: Air pockets cause noise and uneven heating because they block water flow. 3 / 4

• What is the primary role of a hydronic system controller?
• Heat water
• Pump water
• Vent combustion gases
• Regulate temperature and system operation

Rationale: Controllers manage boiler operation, water temperature, and circulation based on demand.

• Which material is commonly used for residential hydronic piping?
• Aluminum
• Galvanized steel
• PEX or copper

D. PVC

Rationale: PEX is flexible and corrosion-resistant; copper is durable and heat-tolerant. PVC is not rated for hot water.

• What is the typical operating pressure for a residential closed-loop hydronic

system?

• 0–5 psi
• 10–15 psi
• 12–25 psi
• 50–60 psi

Rationale: Residential systems are usually pressurized between 12–25 psi to ensure proper flow without stressing components.

• Which device prevents reverse flow in a hydronic system?
• Balancing valve
• Pressure relief valve
• Check valve
• Mixing valve
• / 4