MD HVAC MASTERS UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
●● 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
QUESTIONS AND CORRECT ANSWERS
●● 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
