NC PLUMBING LICENSE EXAM 2024
LATEST UPDATED EXAM COMPLETE
250 QUESTIONS WITH DETAILED
VERIFIED AND 100% CORRECT
ANSWERS ACTUAL NEW ALREADY
GRADED A+
When can an existing building sewer/drain be used? -
....ANSWER...If it is proved by exam to be free of roots
and is air tight
Invert - ....ANSWER...The lowest point of the INSIDE of
a drain, pipe, channel, or other liquid-carrying conduit.
2 inch pipe falls - ....ANSWER...1/4 per foot
Horizontal Pipe - ....ANSWER...Branch of Building Drain
1
,Vertical Pipes - ....ANSWER...Stacks
Minimum Drain Size of any building servicing a water
closet? - ....ANSWER...3 inch
How many water closets can a 3 inch pipe support? -
....ANSWER...No more than 3
Drainage Fixture Unit - ....ANSWER...A measure of the
probable discharge into the drainage system by various
types of plumbing fixtures. 1 = Equals 7.5 gallons
Cubic Foot of Water - ....ANSWER...7.5 gallons
How much lead do your pour in a joint? - ....ANSWER...1
inch
Copper Tubing is - ....ANSWER...Rigid
Copper Pipe - ....ANSWER...Soft
Copper Soldered Joints must be - ....ANSWER...Lead Free
2
, Cooking % of Lead - ....ANSWER. 0.25%
Insulation must be a minimum of? - ....ANSWER. R6.5
Exterior Water Supply must be installed -
....ANSWER...not less than 6 inches below frost line or 12
inches below grade, whichever is greater
Double sanitary tee - ....ANSWER. Cross
What direction does the hub go? - ....ANSWER. Upstream
Sanitary Tees are used only - ....ANSWER. from
horizontal to vertical
Building Sewers inches and larger must have
every feet - ....ANSWER...8 inches, manholes, 400
GPF - ....ANSWER...Gallons Per Flush
Minimum Size Drain pipe - ....ANSWER...1 1/4 inch
Drain Fixture Unit for Clear Water Appliances -
....ANSWER....5 units
3
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