MD HVAC MASTERS EXAMS SCRIPT ALL
QUESTIONS AND ANSWERS SURE A+
✔✔What is the minimum rate for an 800 sq. ft. uninhabited attic exhausted by the
mechanical system? - ✔✔16 CFM
SOLUTION:
800 X .02 = 16 cfm
✔✔Central furnace within compartments or alcoves shall have a minimum of working
space clearance of ________ on the sides. - ✔✔3"
✔✔What is the minimum intermittent mechanical ventilation rate of required outdoor air
for a residential kitchen? - ✔✔100 CFM
✔✔If you add refrigerant to an air conditioner that has an external equalized TXV, the
subcooling will _____________. - ✔✔Go up
✔✔What is the minimum opening size for louvers used for intake air opening in exterior
walls? - ✔✔¼"
, ✔✔Rooms containing equipment requiring access shall be provided with an opening of
not less than ______________. - ✔✔36" x 80"
✔✔A fuel fired boiler that is not listed for closet or alcove installation shall be install in
rooms having a volume at least ________ times the total volume of the boiler. - ✔✔16
✔✔An 18" high-heat metal chimney shall have a minimum sheet steel thickness of
____________. - ✔✔12 gauge
✔✔A residential heating system has 16" galvanized duct. The minimum thickness
required by code is __________. - ✔✔26 gauge
✔✔When installing an exhaust duct for down flow domestic range hoods, a
_____________ is required. - ✔✔Backdraft Damper
✔✔The purpose of a condenser is ________________. - ✔✔Reject heat which is
absorbed by the refrigerant
✔✔Prior to retrofitting refrigerant systems containing 250 lbs. of refrigerant, what must
be done? - ✔✔Notify code officials
✔✔In order to ensure efficient heat distribution, the difference between the boiler water
temperature and the return temperature in hot water system shall not be less than
___________. - ✔✔20 degrees
✔✔Combustion air openings for fuel burning appliance shall be covered with corrosion-
resistant screen of not less than ____________ mesh. - ✔✔¼ inch
✔✔In a water source heat pump, the reversing valve controls ____________. - ✔✔High
pressure vapor
✔✔Ventilation for a 4 bedroom 3 bathroom, 1 kitchen, 2 car garage home is ________
cfm's - ✔✔450
✔✔Method a voltmeter is connected to circuit when measuring for voltage is
___________. - ✔✔Parallel
✔✔A 400 square foot machine room with 3 people shall have a ventilation requirement
of? - ✔✔200 CFM
SOLUTION:
400 X .05 = 200
QUESTIONS AND ANSWERS SURE A+
✔✔What is the minimum rate for an 800 sq. ft. uninhabited attic exhausted by the
mechanical system? - ✔✔16 CFM
SOLUTION:
800 X .02 = 16 cfm
✔✔Central furnace within compartments or alcoves shall have a minimum of working
space clearance of ________ on the sides. - ✔✔3"
✔✔What is the minimum intermittent mechanical ventilation rate of required outdoor air
for a residential kitchen? - ✔✔100 CFM
✔✔If you add refrigerant to an air conditioner that has an external equalized TXV, the
subcooling will _____________. - ✔✔Go up
✔✔What is the minimum opening size for louvers used for intake air opening in exterior
walls? - ✔✔¼"
, ✔✔Rooms containing equipment requiring access shall be provided with an opening of
not less than ______________. - ✔✔36" x 80"
✔✔A fuel fired boiler that is not listed for closet or alcove installation shall be install in
rooms having a volume at least ________ times the total volume of the boiler. - ✔✔16
✔✔An 18" high-heat metal chimney shall have a minimum sheet steel thickness of
____________. - ✔✔12 gauge
✔✔A residential heating system has 16" galvanized duct. The minimum thickness
required by code is __________. - ✔✔26 gauge
✔✔When installing an exhaust duct for down flow domestic range hoods, a
_____________ is required. - ✔✔Backdraft Damper
✔✔The purpose of a condenser is ________________. - ✔✔Reject heat which is
absorbed by the refrigerant
✔✔Prior to retrofitting refrigerant systems containing 250 lbs. of refrigerant, what must
be done? - ✔✔Notify code officials
✔✔In order to ensure efficient heat distribution, the difference between the boiler water
temperature and the return temperature in hot water system shall not be less than
___________. - ✔✔20 degrees
✔✔Combustion air openings for fuel burning appliance shall be covered with corrosion-
resistant screen of not less than ____________ mesh. - ✔✔¼ inch
✔✔In a water source heat pump, the reversing valve controls ____________. - ✔✔High
pressure vapor
✔✔Ventilation for a 4 bedroom 3 bathroom, 1 kitchen, 2 car garage home is ________
cfm's - ✔✔450
✔✔Method a voltmeter is connected to circuit when measuring for voltage is
___________. - ✔✔Parallel
✔✔A 400 square foot machine room with 3 people shall have a ventilation requirement
of? - ✔✔200 CFM
SOLUTION:
400 X .05 = 200
