HYDRONIC HEATING
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What is the purpose of a balancing valve?
a) to shut off flow completely to a single zone
b) to modulate and balance the flow through each branch
c) to prevent backflow into the main supply line
d) to reduce system pressure before the pump - Correct Answer: b
2. Where is the circulating pump in a hydronic system located?
a) in the return main, just upstream of the boiler
b) in the supply main, just downstream of the Expansion Tank
c) directly inside the boiler jacket
d) at the terminal end of each zone - Correct Answer: b
3. What is the purpose of a thermal balancer?
a) it increases flow rate through the primary loop
b) it prevents residual boiler heat from tripping the high limit Aquastat
c) it balances air pressure in the expansion tank
d) it regulates chlorine injection downstream of the heater - Correct
Answer: b
4. The pressure difference produced by a pump between its inlet and outlet
ports is a partial definition of what?
a) flow rate
b) pump head
, c) static pressure
d) thermal mass - Correct Answer: b
5. State the general rule of thumb for sizing circulating pumps.
a) 1 GPM per 10,000 Btu's; allow 1 ft of friction loss every 40 ft
b) 1 GPM per 1,000 Btu's; allow 5 ft of friction loss every 10 ft
c) 10 GPM per 10,000 Btu's; allow no friction loss allowance
d) 1 GPM per 100,000 Btu's; allow 1 ft of friction loss every 100 ft -
Correct Answer: a
6. If two identical pumps are installed in series, what happens to the system
pressure?
a) pressure decreases
b) pressure increases
c) pressure remains unchanged
d) pressure fluctuates unpredictably - Correct Answer: b
7. What happens if the same pumps are installed in parallel?
a) GPM decreases
b) GPM increases
c) GPM remains unchanged
d) pressure increases instead of GPM - Correct Answer: b
8. If a check valve chatters, what must be done?
a) it must be lubricated
b) it must be replaced
c) it should be left alone, chattering is normal
d) it must be repositioned downstream - Correct Answer: b
9. How is an immersion-type low water cut-off tested?
a) using a pressure gauge only, without draining
b) by draining the system, same as float type
, c) by disconnecting the wiring and checking for continuity only
d) it cannot be tested in the field - Correct Answer: b
10.How can you tell if a differential pressure bypass valve is working correctly?
a) pressure at the discharge of the circulation pump increases as each valve
closes
b) pressure at the discharge of the circulation pump does not increase as
each valve closes
c) flow rate through the bypass valve remains at zero at all times
d) the valve makes an audible click when zones close - Correct Answer:
b
11.What should be checked first if an aquastat appears to be malfunctioning?
a) the boiler water temperature
b) wiring connections and contacts, or corrosion
c) the circulating pump motor
d) the expansion tank pressure - Correct Answer: b
12.What is the primary cause of sooting on heat source surfaces?
a) low water temperature
b) flame impingement
c) excess air in the combustion chamber
d) low flue gas temperature - Correct Answer: b
13.Air in the system or low flue gas temperature can cause what?
a) increased efficiency
b) corrosion
c) reduced noise
d) lower stack temperature - Correct Answer: b
14.Incomplete combustion and very high stack temperature may indicate
what?
a) under-firing
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What is the purpose of a balancing valve?
a) to shut off flow completely to a single zone
b) to modulate and balance the flow through each branch
c) to prevent backflow into the main supply line
d) to reduce system pressure before the pump - Correct Answer: b
2. Where is the circulating pump in a hydronic system located?
a) in the return main, just upstream of the boiler
b) in the supply main, just downstream of the Expansion Tank
c) directly inside the boiler jacket
d) at the terminal end of each zone - Correct Answer: b
3. What is the purpose of a thermal balancer?
a) it increases flow rate through the primary loop
b) it prevents residual boiler heat from tripping the high limit Aquastat
c) it balances air pressure in the expansion tank
d) it regulates chlorine injection downstream of the heater - Correct
Answer: b
4. The pressure difference produced by a pump between its inlet and outlet
ports is a partial definition of what?
a) flow rate
b) pump head
, c) static pressure
d) thermal mass - Correct Answer: b
5. State the general rule of thumb for sizing circulating pumps.
a) 1 GPM per 10,000 Btu's; allow 1 ft of friction loss every 40 ft
b) 1 GPM per 1,000 Btu's; allow 5 ft of friction loss every 10 ft
c) 10 GPM per 10,000 Btu's; allow no friction loss allowance
d) 1 GPM per 100,000 Btu's; allow 1 ft of friction loss every 100 ft -
Correct Answer: a
6. If two identical pumps are installed in series, what happens to the system
pressure?
a) pressure decreases
b) pressure increases
c) pressure remains unchanged
d) pressure fluctuates unpredictably - Correct Answer: b
7. What happens if the same pumps are installed in parallel?
a) GPM decreases
b) GPM increases
c) GPM remains unchanged
d) pressure increases instead of GPM - Correct Answer: b
8. If a check valve chatters, what must be done?
a) it must be lubricated
b) it must be replaced
c) it should be left alone, chattering is normal
d) it must be repositioned downstream - Correct Answer: b
9. How is an immersion-type low water cut-off tested?
a) using a pressure gauge only, without draining
b) by draining the system, same as float type
, c) by disconnecting the wiring and checking for continuity only
d) it cannot be tested in the field - Correct Answer: b
10.How can you tell if a differential pressure bypass valve is working correctly?
a) pressure at the discharge of the circulation pump increases as each valve
closes
b) pressure at the discharge of the circulation pump does not increase as
each valve closes
c) flow rate through the bypass valve remains at zero at all times
d) the valve makes an audible click when zones close - Correct Answer:
b
11.What should be checked first if an aquastat appears to be malfunctioning?
a) the boiler water temperature
b) wiring connections and contacts, or corrosion
c) the circulating pump motor
d) the expansion tank pressure - Correct Answer: b
12.What is the primary cause of sooting on heat source surfaces?
a) low water temperature
b) flame impingement
c) excess air in the combustion chamber
d) low flue gas temperature - Correct Answer: b
13.Air in the system or low flue gas temperature can cause what?
a) increased efficiency
b) corrosion
c) reduced noise
d) lower stack temperature - Correct Answer: b
14.Incomplete combustion and very high stack temperature may indicate
what?
a) under-firing
