MD HVAC MASTERS ACTUAL EXAM 2026
QUESTIONS SOLUTIONS GRADED A+
◉ A 2000 sq. ft. "Type II" dry-cleaning systems shall be provided
with an exhaust no less than __________ CFM's. Answer: 2000
◉ A bathroom in a dwelling unit must be provided with a minimum
intermittent exhaust of __________. Answer: 50 CFM
◉ A hot-water heating boiler that has a 5,000,000 BTU/HR input
shall have a minimum clearance of _____________ from the top of the
boiler to the ceiling. Answer: 3 feet
◉ A heater installed in a public garage must be installed a minimum
distance of ____________ above the floor? Answer: 8 feet
◉ ______________ is a tube or pipe used to carry refrigerant gas from
evaporator to the compressor Answer: Suction line
◉ Commercial appliance exhaust outlets that terminate above roof
shall have the discharge opening located not less than ___________
inches above the roof surface. Answer: 40
,◉ 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
◉ Outside air exhaust and intake openings shall be located a
minimum of ____________ feet from lot lines or building on the same
lot. Answer: 10
◉ 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
, ◉ An auxiliary drain pan used in secondary drain systems for an a/c
systems shall have a minimum depth of ________ inch. Answer: 1 ½
◉ A ventilation supply system shall deliver the required rate of
supply air within an occupied space minimum of ____________ above
the floor. Answer: 3"
◉ 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
QUESTIONS SOLUTIONS GRADED A+
◉ A 2000 sq. ft. "Type II" dry-cleaning systems shall be provided
with an exhaust no less than __________ CFM's. Answer: 2000
◉ A bathroom in a dwelling unit must be provided with a minimum
intermittent exhaust of __________. Answer: 50 CFM
◉ A hot-water heating boiler that has a 5,000,000 BTU/HR input
shall have a minimum clearance of _____________ from the top of the
boiler to the ceiling. Answer: 3 feet
◉ A heater installed in a public garage must be installed a minimum
distance of ____________ above the floor? Answer: 8 feet
◉ ______________ is a tube or pipe used to carry refrigerant gas from
evaporator to the compressor Answer: Suction line
◉ Commercial appliance exhaust outlets that terminate above roof
shall have the discharge opening located not less than ___________
inches above the roof surface. Answer: 40
,◉ 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
◉ Outside air exhaust and intake openings shall be located a
minimum of ____________ feet from lot lines or building on the same
lot. Answer: 10
◉ 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
, ◉ An auxiliary drain pan used in secondary drain systems for an a/c
systems shall have a minimum depth of ________ inch. Answer: 1 ½
◉ A ventilation supply system shall deliver the required rate of
supply air within an occupied space minimum of ____________ above
the floor. Answer: 3"
◉ 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
