MASTER MASSACHUSETTS PLUMBING
EXAM QUESTIONS AND ANSWERS
Shower temperature - Answer-Shower head not exceed 110 or 112
Trapping commercial food grinder - Answer-Commercial food waste grinder trapped
separately
Washing Machine standpipe - Answer-Washing machine stand pipe min is 30" above
the base of machine and 18-30" above trap and discharge through an air break
Sacrium - Answer-Sacrium drains in a dry well
1 DFU - Answer-Equals 7.5 GPM
Back water valve - Answer-Back water valve on outlet pipe on ejector
Minimum GPM on Residential Ejector Pump - Answer-Residential Ejector Pump
minimum is 20 GPM
Sanitary Tee - Answer-No longer called an Esterbrook
No trap required - Answer-No traps required on indirect waste main or branch main
Special Hazardous Waste - Answer-Special Hazardous Wastes are marked yellow and
are 25 feet apart
Max Hot Water - Answer-Residential hot water 130 degree max temp
Max temp into drainage system - Answer-Max temp is 150 degree allowed into drainage
system
Mechanical Pressure Absorbers - Answer-Located at the end of long runs of water pipe
Saddle valves - Answer-Prohibited on water and drainage lines
Sillcock psi - Answer-Minimum PSI at sillcock 10 psi and 5 gpm
Residential PSI - Answer-Pressure greater than 80 psi in a house requires a pressure
reducing valve
Safe water - Answer-3" in diameter tag with letters, 1/2 " height marked every 25'
, Unsafe water - Answer-4" in equilateral triangle with letters 7/16 in height marked every
25ft
Vacuum Relief - Answer-200psi and 200 degrees F rating
Gas
1000 BTU - Answer-1 cu ft natural gas
Gas
2500 BTU - Answer-1 cu ft propane
20psi - Answer-Max LP PSI
Metal not allowed - Answer-Aluminum alloy for gas not allowed in exterior or
underground
LP tank and Natural Gas install - Answer-LP tank 10ft from source of ignition ; natural
3ft from source of ignition
10 threads = 1" gas pipe - Answer-1" gas pipe threads 7/8 " long
12 threads = 2 1/2" gas pipe - Answer-2 1/2" gas pipe threads 1 1/2" long
Gas striker plates - Answer-.0508
Prohibited concealed gas fittings - Answer-Unions, tubing fittings, right and left
couplings, bushing, swing joints and compression fittings
Allowed concealed gas fittings - Answer-Tees, elbows, couplings, brazed, listed fittings
Gas-solder - Answer-No solder joints on underground gas
Gas drip legs - Answer-No drip legs in rooms that can be freeze
Gas equiptment on roof - Answer-Opening in roof/hatch must be 6ft from edge or with
42" rail for service of gas equipment
Wood louvers - Answer-25% free air
Metal louvers - Answer-75% free air
Makeup air requirement - Answer-Fan in a can must commence within 12" from floor
and 12" from ceiling
-min free air Vertical =1 cu in per 4000
- min free air Horizontal = 1 cu in per 2000
EXAM QUESTIONS AND ANSWERS
Shower temperature - Answer-Shower head not exceed 110 or 112
Trapping commercial food grinder - Answer-Commercial food waste grinder trapped
separately
Washing Machine standpipe - Answer-Washing machine stand pipe min is 30" above
the base of machine and 18-30" above trap and discharge through an air break
Sacrium - Answer-Sacrium drains in a dry well
1 DFU - Answer-Equals 7.5 GPM
Back water valve - Answer-Back water valve on outlet pipe on ejector
Minimum GPM on Residential Ejector Pump - Answer-Residential Ejector Pump
minimum is 20 GPM
Sanitary Tee - Answer-No longer called an Esterbrook
No trap required - Answer-No traps required on indirect waste main or branch main
Special Hazardous Waste - Answer-Special Hazardous Wastes are marked yellow and
are 25 feet apart
Max Hot Water - Answer-Residential hot water 130 degree max temp
Max temp into drainage system - Answer-Max temp is 150 degree allowed into drainage
system
Mechanical Pressure Absorbers - Answer-Located at the end of long runs of water pipe
Saddle valves - Answer-Prohibited on water and drainage lines
Sillcock psi - Answer-Minimum PSI at sillcock 10 psi and 5 gpm
Residential PSI - Answer-Pressure greater than 80 psi in a house requires a pressure
reducing valve
Safe water - Answer-3" in diameter tag with letters, 1/2 " height marked every 25'
, Unsafe water - Answer-4" in equilateral triangle with letters 7/16 in height marked every
25ft
Vacuum Relief - Answer-200psi and 200 degrees F rating
Gas
1000 BTU - Answer-1 cu ft natural gas
Gas
2500 BTU - Answer-1 cu ft propane
20psi - Answer-Max LP PSI
Metal not allowed - Answer-Aluminum alloy for gas not allowed in exterior or
underground
LP tank and Natural Gas install - Answer-LP tank 10ft from source of ignition ; natural
3ft from source of ignition
10 threads = 1" gas pipe - Answer-1" gas pipe threads 7/8 " long
12 threads = 2 1/2" gas pipe - Answer-2 1/2" gas pipe threads 1 1/2" long
Gas striker plates - Answer-.0508
Prohibited concealed gas fittings - Answer-Unions, tubing fittings, right and left
couplings, bushing, swing joints and compression fittings
Allowed concealed gas fittings - Answer-Tees, elbows, couplings, brazed, listed fittings
Gas-solder - Answer-No solder joints on underground gas
Gas drip legs - Answer-No drip legs in rooms that can be freeze
Gas equiptment on roof - Answer-Opening in roof/hatch must be 6ft from edge or with
42" rail for service of gas equipment
Wood louvers - Answer-25% free air
Metal louvers - Answer-75% free air
Makeup air requirement - Answer-Fan in a can must commence within 12" from floor
and 12" from ceiling
-min free air Vertical =1 cu in per 4000
- min free air Horizontal = 1 cu in per 2000
