OHIO HYDRONICS CONTRACTOR PRACTICE
EXAM 2026 COMPREHENSIVE EXAM
◉ A(n) _____ flow meter is a flow meter that measures the
displacement of a tapered piston or float . Answer: inline
◉ A _______ valve is a hydronic piping system monitoring device that
is equipped with an integral check valve designed to minimize
system fluid loss when setting up to monitor pumps , heat
exchangers , valves , or other devices handling hot or cold HTF .
Answer: readout
◉ The _______ prevents damage to a steam pressure gauge by forming
a water seal to keep steam from entering the gauge . Answer:
straight coil siphon
◉ A ____-pipe system is used where each terminal unit or zone may
heat or cool independently of all other units or zones . Answer: Four
◉ In a four-pipe system , a ______ valve is generally recommended
when high differential pressures are encountered . Answer: double
seated two-way
,◉ A _____ valve changeover using two three - way valves connected to
the terminal unit or zone piping is the most commonly used
changeover method on a four - pipe system. Answer: conventional
three-way
◉ There are _______ types of terminal units commonly used in
hydronic heating systems. Answer: Two
◉ A _____ radiator is a radiator designed to function more efficiently
and at lower HTF temperatures than a traditional radiator . Answer:
Panel
◉ _____ systems are used on driveways , walkways , parking areas ,
stairways , ramps , loading docks , and other outside surfaces .
Answer: Snow melt
◉ Of the types of chilled beams, _____ systems are similar to
convection systems and have ventilation air delivered through
ductwork by a central air - handling system . Answer: active
◉ A _______ convection unit is a terminal unit that creates convective
currents by mechanically moving air past a terminal unit element.
Answer: Forced-air
, ◉ There are ______ types of hydronic heating forced-air convection
units. Answer: Four
◉ The _____ in a cabinet unit heater adds energy to the air so that
directional louvers can be used on the top or front of the heater to
distribute the air more efficiently in a building space. Answer:
Blower
◉ A ______ heater is a self-contained, forced-air convection heater
that is not connected to ductwork and contains a fan, an HTF coil,
and controls in one cabinet. Answer: Unit
◉ In northern climates, low-temperature limit switches are installed
that force dampers to close and activate the heating system to _____%
when the outdoor low-temperature limit is reached. Answer: 100
◉ A _____ is intended to supply air only to the room where it is
located. Answer: Fan coil unit
◉ The difference between the draw-through and blow-through AHU
fan types is in the _____ of air produced by the unit. Answer:
Temperature
◉ A(n) ______ of condition spaces below 30% tends to reduce
moisture levels in occupants, which can result in respiratory
EXAM 2026 COMPREHENSIVE EXAM
◉ A(n) _____ flow meter is a flow meter that measures the
displacement of a tapered piston or float . Answer: inline
◉ A _______ valve is a hydronic piping system monitoring device that
is equipped with an integral check valve designed to minimize
system fluid loss when setting up to monitor pumps , heat
exchangers , valves , or other devices handling hot or cold HTF .
Answer: readout
◉ The _______ prevents damage to a steam pressure gauge by forming
a water seal to keep steam from entering the gauge . Answer:
straight coil siphon
◉ A ____-pipe system is used where each terminal unit or zone may
heat or cool independently of all other units or zones . Answer: Four
◉ In a four-pipe system , a ______ valve is generally recommended
when high differential pressures are encountered . Answer: double
seated two-way
,◉ A _____ valve changeover using two three - way valves connected to
the terminal unit or zone piping is the most commonly used
changeover method on a four - pipe system. Answer: conventional
three-way
◉ There are _______ types of terminal units commonly used in
hydronic heating systems. Answer: Two
◉ A _____ radiator is a radiator designed to function more efficiently
and at lower HTF temperatures than a traditional radiator . Answer:
Panel
◉ _____ systems are used on driveways , walkways , parking areas ,
stairways , ramps , loading docks , and other outside surfaces .
Answer: Snow melt
◉ Of the types of chilled beams, _____ systems are similar to
convection systems and have ventilation air delivered through
ductwork by a central air - handling system . Answer: active
◉ A _______ convection unit is a terminal unit that creates convective
currents by mechanically moving air past a terminal unit element.
Answer: Forced-air
, ◉ There are ______ types of hydronic heating forced-air convection
units. Answer: Four
◉ The _____ in a cabinet unit heater adds energy to the air so that
directional louvers can be used on the top or front of the heater to
distribute the air more efficiently in a building space. Answer:
Blower
◉ A ______ heater is a self-contained, forced-air convection heater
that is not connected to ductwork and contains a fan, an HTF coil,
and controls in one cabinet. Answer: Unit
◉ In northern climates, low-temperature limit switches are installed
that force dampers to close and activate the heating system to _____%
when the outdoor low-temperature limit is reached. Answer: 100
◉ A _____ is intended to supply air only to the room where it is
located. Answer: Fan coil unit
◉ The difference between the draw-through and blow-through AHU
fan types is in the _____ of air produced by the unit. Answer:
Temperature
◉ A(n) ______ of condition spaces below 30% tends to reduce
moisture levels in occupants, which can result in respiratory
