MD HVAC MASTERS COMPREHENSIVE EXAMS
UPDATED QUESTIONS AND ANSWERS SURE A+
✔✔What is the maximum operating pressure in an air duct system? - ✔✔10.0 IWC
✔✔Convert 25°C to Fahrenheit - ✔✔77 °F
✔✔Chemicals are added to cooling tower water to address the following problems
except-
a. Algae
b. Slime
c. Taste
d. Mold - ✔✔Taste
✔✔Which code governs the hydronic piping? - ✔✔International mechanical code
✔✔ For mechanical draft system, exit terminal located adjacent to public walkways shall
be no less than ____________ feet above finish ground level. - ✔✔7
✔✔A 2000 sq. ft. "Type II" dry-cleaning systems shall be provided with an exhaust no
less than __________ CFM's. - ✔✔2000
, ✔✔A bathroom in a dwelling unit must be provided with a minimum intermittent exhaust
of __________. - ✔✔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. - ✔✔3 feet
✔✔A heater installed in a public garage must be installed a minimum distance of
____________ above the floor? - ✔✔8 feet
✔✔______________ is a tube or pipe used to carry refrigerant gas from evaporator to
the compressor - ✔✔Suction line
✔✔Commercial appliance exhaust outlets that terminate above roof shall have the
discharge opening located not less than ___________ inches above the roof surface. -
✔✔40
✔✔A run winding in a compressor has _____________ resistance than the start
winding. - ✔✔Less
✔✔A duct that has an operating temperature of 150 deg F shall be insulated to limit the
exposed surface temperature to ___________. - ✔✔120 °F
✔✔Hydronic pipe system should be cleaned with water and _____________ after
installation. - ✔✔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%? - ✔✔60 °F
✔✔Outside air exhaust and intake openings shall be located a minimum of
____________ feet from lot lines or building on the same lot. - ✔✔10
✔✔Down - pipe support material must not promote: - ✔✔Galvanic action
✔✔Central HVAC systems shall have air filters installed in which of the following
locations? - ✔✔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. - ✔✔1 ½
✔✔A ventilation supply system shall deliver the required rate of supply air within an
occupied space minimum of ____________ above the floor. - ✔✔3"
UPDATED QUESTIONS AND ANSWERS SURE A+
✔✔What is the maximum operating pressure in an air duct system? - ✔✔10.0 IWC
✔✔Convert 25°C to Fahrenheit - ✔✔77 °F
✔✔Chemicals are added to cooling tower water to address the following problems
except-
a. Algae
b. Slime
c. Taste
d. Mold - ✔✔Taste
✔✔Which code governs the hydronic piping? - ✔✔International mechanical code
✔✔ For mechanical draft system, exit terminal located adjacent to public walkways shall
be no less than ____________ feet above finish ground level. - ✔✔7
✔✔A 2000 sq. ft. "Type II" dry-cleaning systems shall be provided with an exhaust no
less than __________ CFM's. - ✔✔2000
, ✔✔A bathroom in a dwelling unit must be provided with a minimum intermittent exhaust
of __________. - ✔✔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. - ✔✔3 feet
✔✔A heater installed in a public garage must be installed a minimum distance of
____________ above the floor? - ✔✔8 feet
✔✔______________ is a tube or pipe used to carry refrigerant gas from evaporator to
the compressor - ✔✔Suction line
✔✔Commercial appliance exhaust outlets that terminate above roof shall have the
discharge opening located not less than ___________ inches above the roof surface. -
✔✔40
✔✔A run winding in a compressor has _____________ resistance than the start
winding. - ✔✔Less
✔✔A duct that has an operating temperature of 150 deg F shall be insulated to limit the
exposed surface temperature to ___________. - ✔✔120 °F
✔✔Hydronic pipe system should be cleaned with water and _____________ after
installation. - ✔✔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%? - ✔✔60 °F
✔✔Outside air exhaust and intake openings shall be located a minimum of
____________ feet from lot lines or building on the same lot. - ✔✔10
✔✔Down - pipe support material must not promote: - ✔✔Galvanic action
✔✔Central HVAC systems shall have air filters installed in which of the following
locations? - ✔✔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. - ✔✔1 ½
✔✔A ventilation supply system shall deliver the required rate of supply air within an
occupied space minimum of ____________ above the floor. - ✔✔3"
