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North Dakota Plumbing Practice 13

Practice 13 for Plumbing Exam learners in North Dakota: 25 questions, explained answers, and a review routine.

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Question 1

1

A 1-inch type L copper main feeds a branch needing 12 gpm at the far end. The friction-loss chart shows 1-inch copper at 12 gpm loses about 8 psi per 100 feet. Over 75 feet of developed length, the friction loss is closest to what?

Question 2

2

A flushometer-valve system totals 70 WSFU. Compared with a flush-tank system of the same WSFU, its peak gpm demand from Hunter's curve is what?

Question 3

3

A reduced-pressure backflow assembly is being installed for containment at a commercial building. Where must it be located?

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