MD HVAC MASTERS FINAL PAPER 2026
COMPLETE RESPONSE SET GRADED A+
◉ A run winding in a compressor has _____________ resistance than the
start winding. Answer: Less
◉ A duct that has an operating temperature of 150 deg F shall be
insulated to limit the exposed surface temperature to ___________.
Answer: 120 °F
◉ Hydronic pipe system should be cleaned with water and
_____________ after installation. Answer: Trisodium Phosphate
◉ Using a psychrometric chart in the Modern Refrigeration, what
will the wet bulb be if the dry bulb is 80 degrees and the humidity is
30%? Answer: 60 °F
◉ Down - pipe support material must not promote: Answer:
Galvanic action
◉ Central HVAC systems shall have air filters installed in which of
the following locations? Answer: Upstream from any exchanger coil
,◉ In a unit controlled by a thermostat the differential is the
difference between ____________. Answer: Temperature at which the
switch turns the burners on and the temperature at which the
switch turns the burners off
◉ A ___________ is used to measure relative humidity by comparing
wet/dry bulb temperatures. Answer: Sling Psychrometric
◉ A (n) ___________ prevents slugging in a heat pump system. Answer:
Accumulator
◉ Any appliance in which the products of combustion at the point of
entrance to the flue under normal operating conditions have a
temperature of 1000 degrees is a ____________ appliance. Answer: Low
◉ A connector to a chimney flue shall be at least __________ the lowest
portion of the interior of the flue. Answer: 12" above
◉ The temperature for a fire damper actuating device shall not be
less than ___________ degrees. Answer: 160
◉ Horizontal pipes in a hydronic system should ____________. Answer:
Be sloped toward boiler
, ◉ What is the color code for R-410A? Answer: Rose
◉ A one (1) ton refrigeration system has the equivalent of _________
BTU's. Answer: 12,000
◉ The purpose of a suction accumulator is _______________. Answer: It
catches and holds liquid refrigerant that has passed through the
evaporator coil so it will not enter the compressor
◉ Minimum size access opening for equipment installed in an
underfloor area is ____________. Answer: 22 x 30
◉ External equalizing line should be installed downstream of the
thermostatic expansion valve at? Answer: Diaphragm
◉ A feed water line that delivers makeup water to a hydronic boiler
is required to have which two kinds of valves? Answer: A hand valve
and a pressure reducing valve
◉ Materials used in plenums shall have a flame rating of _____________.
Answer: 25
◉ Flexible air duct connections may pass through which of the
following?
COMPLETE RESPONSE SET GRADED A+
◉ A run winding in a compressor has _____________ resistance than the
start winding. Answer: Less
◉ A duct that has an operating temperature of 150 deg F shall be
insulated to limit the exposed surface temperature to ___________.
Answer: 120 °F
◉ Hydronic pipe system should be cleaned with water and
_____________ after installation. Answer: Trisodium Phosphate
◉ Using a psychrometric chart in the Modern Refrigeration, what
will the wet bulb be if the dry bulb is 80 degrees and the humidity is
30%? Answer: 60 °F
◉ Down - pipe support material must not promote: Answer:
Galvanic action
◉ Central HVAC systems shall have air filters installed in which of
the following locations? Answer: Upstream from any exchanger coil
,◉ In a unit controlled by a thermostat the differential is the
difference between ____________. Answer: Temperature at which the
switch turns the burners on and the temperature at which the
switch turns the burners off
◉ A ___________ is used to measure relative humidity by comparing
wet/dry bulb temperatures. Answer: Sling Psychrometric
◉ A (n) ___________ prevents slugging in a heat pump system. Answer:
Accumulator
◉ Any appliance in which the products of combustion at the point of
entrance to the flue under normal operating conditions have a
temperature of 1000 degrees is a ____________ appliance. Answer: Low
◉ A connector to a chimney flue shall be at least __________ the lowest
portion of the interior of the flue. Answer: 12" above
◉ The temperature for a fire damper actuating device shall not be
less than ___________ degrees. Answer: 160
◉ Horizontal pipes in a hydronic system should ____________. Answer:
Be sloped toward boiler
, ◉ What is the color code for R-410A? Answer: Rose
◉ A one (1) ton refrigeration system has the equivalent of _________
BTU's. Answer: 12,000
◉ The purpose of a suction accumulator is _______________. Answer: It
catches and holds liquid refrigerant that has passed through the
evaporator coil so it will not enter the compressor
◉ Minimum size access opening for equipment installed in an
underfloor area is ____________. Answer: 22 x 30
◉ External equalizing line should be installed downstream of the
thermostatic expansion valve at? Answer: Diaphragm
◉ A feed water line that delivers makeup water to a hydronic boiler
is required to have which two kinds of valves? Answer: A hand valve
and a pressure reducing valve
◉ Materials used in plenums shall have a flame rating of _____________.
Answer: 25
◉ Flexible air duct connections may pass through which of the
following?
