1|Page
MD HVAC MASTERS EXAM LATEST WITH
ACTUAL QUESTIONS AND CORRECT VERIFIED
ANSWERS ALREADY GRADED A+ 100%
GUARANTEED PASS!
______________ is a tube or pipe used to carry
refrigerant gas from evaporator to the compressor -
.....ANSWER ...✔✔ Suction line
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
,2|Page
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
,3|Page
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
, 4|Page
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?
MD HVAC MASTERS EXAM LATEST WITH
ACTUAL QUESTIONS AND CORRECT VERIFIED
ANSWERS ALREADY GRADED A+ 100%
GUARANTEED PASS!
______________ is a tube or pipe used to carry
refrigerant gas from evaporator to the compressor -
.....ANSWER ...✔✔ Suction line
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
,2|Page
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
,3|Page
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
, 4|Page
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?
