MD HVAC MASTERS PRACTICE SCRIPT
UPDATED 2026 TESTED SOLUTIONS
⫸ 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
UPDATED 2026 TESTED SOLUTIONS
⫸ 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
