1. What is the maximum temperature allowed for low-temperature hot
water systems?
A. 180°F
B. 200°F
C. 250°F
D. 275°F
Answer: C. 250°F
2. What type of pipe is commonly used for chilled water systems?
A. CPVC
B. Black steel
C. Galvanized steel
D. Brass
Answer: B. Black steel
3. According to the Michigan Mechanical Code, what is the required slope
for horizontal hydronic piping to ensure drainage?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. 1 inch per foot
Answer: A. 1/8 inch per foot
4. Which of the following is a common cause of air in a hydronic system?
A. Closed expansion tank
B. Pump cavitation
C. Pipe corrosion
D. Improper filling technique
Answer: D. Improper filling technique
,5. What is the primary function of an expansion tank in a hydronic heating
system?
A. Remove air from the system
B. Increase pump pressure
C. Absorb pressure changes due to temperature fluctuations
D. Store additional hot water
Answer: C. Absorb pressure changes due to temperature fluctuations
6. What is the purpose of glycol in hydronic systems?
A. Improve flow rate
B. Prevent freezing
C. Prevent corrosion only
D. Increase system pressure
Answer: B. Prevent freezing
7. What type of valve is typically used to isolate components for
maintenance?
A. Check valve
B. Globe valve
C. Ball valve
D. Mixing valve
Answer: C. Ball valve
8. In a two-pipe hydronic system, how is heating and cooling typically
achieved?
A. By switching fluids
B. Through separate piping loops
C. Using radiant floor tubing
D. By mixing air and water
Answer: B. Through separate piping loops
9. What is the most common method of heat transfer in hydronic
baseboard systems?
A. Radiation
B. Convection
C. Conduction
D. Evaporation
Answer: B. Convection
,10. What is the function of a pressure reducing valve in a hydronic system?
A. Increase water flow
B. Control temperature
C. Limit incoming pressure
D. Remove air from the system
Answer: C. Limit incoming pressure
11. What material is most corrosion-resistant in hydronic piping systems?
A. Black iron
B. Copper
C. PVC
D. Galvanized steel
Answer: B. Copper
12. What is the Michigan licensing requirement for hydronic contractors
regarding insurance?
A. No insurance required
B. Minimum of $100,000 liability
C. Bond only
D. Minimum of $300,000 liability insurance
Answer: D. Minimum of $300,000 liability insurance
13. What is a common symptom of a water-logged expansion tank?
A. High system pressure
B. Low pump flow
C. Air in system
D. Boiler won't fire
Answer: A. High system pressure
14. What is the correct action if hydronic pipes are making knocking
noises?
A. Increase pump speed
B. Bleed air from the system
C. Replace the piping
D. Add more water
Answer: B. Bleed air from the system
, 15. What component is used to regulate water temperature in a mixing
circuit?
A. Ball valve
B. Flow control valve
C. Thermostatic mixing valve
D. Gate valve
Answer: C. Thermostatic mixing valve
16. What is the standard test pressure for hydronic piping before
operation?
A. 25 psi
B. 50 psi
C. 100 psi
D. 1.5 times the operating pressure
Answer: D. 1.5 times the operating pressure
17. What is the minimum burial depth for underground hydronic piping in
Michigan?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: D. 24 inches
18. What type of heat exchanger is commonly used in a hydronic snow melt
system?
A. Tube and shell
B. Brazed plate
C. Plate and frame
D. Tankless coil
Answer: B. Brazed plate
19. What safety device is required on a boiler to prevent overpressure?
A. Temperature gauge
B. Flow switch
C. Pressure relief valve
D. Low-water cutoff
Answer: C. Pressure relief valve
water systems?
A. 180°F
B. 200°F
C. 250°F
D. 275°F
Answer: C. 250°F
2. What type of pipe is commonly used for chilled water systems?
A. CPVC
B. Black steel
C. Galvanized steel
D. Brass
Answer: B. Black steel
3. According to the Michigan Mechanical Code, what is the required slope
for horizontal hydronic piping to ensure drainage?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. 1 inch per foot
Answer: A. 1/8 inch per foot
4. Which of the following is a common cause of air in a hydronic system?
A. Closed expansion tank
B. Pump cavitation
C. Pipe corrosion
D. Improper filling technique
Answer: D. Improper filling technique
,5. What is the primary function of an expansion tank in a hydronic heating
system?
A. Remove air from the system
B. Increase pump pressure
C. Absorb pressure changes due to temperature fluctuations
D. Store additional hot water
Answer: C. Absorb pressure changes due to temperature fluctuations
6. What is the purpose of glycol in hydronic systems?
A. Improve flow rate
B. Prevent freezing
C. Prevent corrosion only
D. Increase system pressure
Answer: B. Prevent freezing
7. What type of valve is typically used to isolate components for
maintenance?
A. Check valve
B. Globe valve
C. Ball valve
D. Mixing valve
Answer: C. Ball valve
8. In a two-pipe hydronic system, how is heating and cooling typically
achieved?
A. By switching fluids
B. Through separate piping loops
C. Using radiant floor tubing
D. By mixing air and water
Answer: B. Through separate piping loops
9. What is the most common method of heat transfer in hydronic
baseboard systems?
A. Radiation
B. Convection
C. Conduction
D. Evaporation
Answer: B. Convection
,10. What is the function of a pressure reducing valve in a hydronic system?
A. Increase water flow
B. Control temperature
C. Limit incoming pressure
D. Remove air from the system
Answer: C. Limit incoming pressure
11. What material is most corrosion-resistant in hydronic piping systems?
A. Black iron
B. Copper
C. PVC
D. Galvanized steel
Answer: B. Copper
12. What is the Michigan licensing requirement for hydronic contractors
regarding insurance?
A. No insurance required
B. Minimum of $100,000 liability
C. Bond only
D. Minimum of $300,000 liability insurance
Answer: D. Minimum of $300,000 liability insurance
13. What is a common symptom of a water-logged expansion tank?
A. High system pressure
B. Low pump flow
C. Air in system
D. Boiler won't fire
Answer: A. High system pressure
14. What is the correct action if hydronic pipes are making knocking
noises?
A. Increase pump speed
B. Bleed air from the system
C. Replace the piping
D. Add more water
Answer: B. Bleed air from the system
, 15. What component is used to regulate water temperature in a mixing
circuit?
A. Ball valve
B. Flow control valve
C. Thermostatic mixing valve
D. Gate valve
Answer: C. Thermostatic mixing valve
16. What is the standard test pressure for hydronic piping before
operation?
A. 25 psi
B. 50 psi
C. 100 psi
D. 1.5 times the operating pressure
Answer: D. 1.5 times the operating pressure
17. What is the minimum burial depth for underground hydronic piping in
Michigan?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: D. 24 inches
18. What type of heat exchanger is commonly used in a hydronic snow melt
system?
A. Tube and shell
B. Brazed plate
C. Plate and frame
D. Tankless coil
Answer: B. Brazed plate
19. What safety device is required on a boiler to prevent overpressure?
A. Temperature gauge
B. Flow switch
C. Pressure relief valve
D. Low-water cutoff
Answer: C. Pressure relief valve
