3 & 5 HVAC EXAM QUESTIONS WITH
CORRECT ANSWERS 2025
tubing consists of high-
density polyethylene that has undergone molecule modification that creates sufficient tie chains betwee
n the polyethene molecules to allow it to operate at higher temperatures. - CORRECT ANSWER -PE-RT
When water is used as the source fluid for open loop systems, the heat pump must be configured to prev
ent freezing of the . - CORRECT ANSWER -Evaporator
A is a device for converting low-temperature heat into higher temperature heat. -
CORRECT ANSWER -Heat Pump
All solar thermal systems use a to consisting of one or more . - CORRECT ANSWER -
collection array, solar collectors
An objectâ s thermal can be defined as its thickness in the direction of heat flow divided by its ther
mal conductivity. - CORRECT ANSWER -Resistance
In an ideal application, the rate of heatYproduction by the heat source would the rate of heat by the
heat emitters. - CORRECT ANSWER -Exactly match
All heating systems consist of devices that convert one form of energy into another. - CORRECT ANSWER -
True
AYdevice used to allow or prevent flow through a zone circuit is called a(n) . - CORRECT ANSWER -
Zone Valve
A(n) is commonly used to mount an air vent at high points in piping circuits. - CORRECT ANSWER -
Baseboard Tee
Another specialty valve widely used in hydronic systems provides the ability to isolate, flow balance, and
even drain individual heat emitters. It is called a . - CORRECT ANSWER -Lockshield Valve
, Copper water tube is available in three wall thicknesses designated as types in order of decreasing
wall thickness. - CORRECT ANSWER -K, L, and M
Unlike PEX tubing, PEX-AL-
PEX tubing cannot be repaired by heating the tub until the PEX reaches its state. -
CORRECT ANSWER -amorphous
Fittings for copper tubing are available in either wrought copper or . - CORRECT ANSWER -Cast Brass
Feed water valves operate by balancing the force generated by water pressure against an internal flexible
, with the counterforce generated by a partially compressed spring. - CORRECT ANSWER -
Diaphragm
When soldering copper tubing be sure the tube cut is square. Use a(n) with a blade suitable for
the copper tubing. - CORRECT ANSWER -wheel cutter or chop saw
A feed water valve is used to increase the pressure of water from a domestic water distribution pipe befo
re it enters a hydronic system. - CORRECT ANSWER -False
When long straight runs of rigid tubing are required, it may be necessary to install an expansion loop or a
n expansion offset to absorb the movement. Another alternative is to install an expansion capable o
f absorbing the movement. - CORRECT ANSWER -compensator
are designed specifically for component isolation. - CORRECT ANSWER -Gate Valves
Hydronic heating systems should never use a combination of flexible and rigid piping materials. -
CORRECT ANSWER -False
Some common pipe fittings in hydronic systems include . - CORRECT ANSWER -
couplings, elbows, and tees
CORRECT ANSWERS 2025
tubing consists of high-
density polyethylene that has undergone molecule modification that creates sufficient tie chains betwee
n the polyethene molecules to allow it to operate at higher temperatures. - CORRECT ANSWER -PE-RT
When water is used as the source fluid for open loop systems, the heat pump must be configured to prev
ent freezing of the . - CORRECT ANSWER -Evaporator
A is a device for converting low-temperature heat into higher temperature heat. -
CORRECT ANSWER -Heat Pump
All solar thermal systems use a to consisting of one or more . - CORRECT ANSWER -
collection array, solar collectors
An objectâ s thermal can be defined as its thickness in the direction of heat flow divided by its ther
mal conductivity. - CORRECT ANSWER -Resistance
In an ideal application, the rate of heatYproduction by the heat source would the rate of heat by the
heat emitters. - CORRECT ANSWER -Exactly match
All heating systems consist of devices that convert one form of energy into another. - CORRECT ANSWER -
True
AYdevice used to allow or prevent flow through a zone circuit is called a(n) . - CORRECT ANSWER -
Zone Valve
A(n) is commonly used to mount an air vent at high points in piping circuits. - CORRECT ANSWER -
Baseboard Tee
Another specialty valve widely used in hydronic systems provides the ability to isolate, flow balance, and
even drain individual heat emitters. It is called a . - CORRECT ANSWER -Lockshield Valve
, Copper water tube is available in three wall thicknesses designated as types in order of decreasing
wall thickness. - CORRECT ANSWER -K, L, and M
Unlike PEX tubing, PEX-AL-
PEX tubing cannot be repaired by heating the tub until the PEX reaches its state. -
CORRECT ANSWER -amorphous
Fittings for copper tubing are available in either wrought copper or . - CORRECT ANSWER -Cast Brass
Feed water valves operate by balancing the force generated by water pressure against an internal flexible
, with the counterforce generated by a partially compressed spring. - CORRECT ANSWER -
Diaphragm
When soldering copper tubing be sure the tube cut is square. Use a(n) with a blade suitable for
the copper tubing. - CORRECT ANSWER -wheel cutter or chop saw
A feed water valve is used to increase the pressure of water from a domestic water distribution pipe befo
re it enters a hydronic system. - CORRECT ANSWER -False
When long straight runs of rigid tubing are required, it may be necessary to install an expansion loop or a
n expansion offset to absorb the movement. Another alternative is to install an expansion capable o
f absorbing the movement. - CORRECT ANSWER -compensator
are designed specifically for component isolation. - CORRECT ANSWER -Gate Valves
Hydronic heating systems should never use a combination of flexible and rigid piping materials. -
CORRECT ANSWER -False
Some common pipe fittings in hydronic systems include . - CORRECT ANSWER -
couplings, elbows, and tees
