NHIE PLUMBING COMPREHENSIVE EXAM
QUESTIONS AND CORRECT ANSWERS
STUDY GUIDE
●● Air Admittance Valve (AAV)
Answer: One-way valve designed to allow air to enter the plumbing
drainage system when negative pressure develops in the piping system.
●● Air Break (Drainage System)
Answer: An arrangement in which a discharge pipe from a fixture,
appliance or device drains indirectly into a receptor below the flood-
level rim of the receptor, and above the trap seal.
●● air gap
Answer: Indirect waste arrangement where the waste is discharged to the
drainage system through piping that terminates at a specific distance
above the flood level rim. ( 2 times the pipe size, never less than 1 inch)
●● Area Drain
Answer: A receptor designed to collect surface or storm water from an
open area
●● Backflow
, Answer: Unwanted reverse flow of contaminants through a cross-
connection into a potable water system. It occurs when the pressure in
the potable water supply drops below the pressure of the contaminated
supply.
●● Back siphonage
Answer: backflow due to negative pressure
●● Back water valve
Answer: a device installed in a drainage system to prevent reverse flow .
●● branch
Answer: any part of the piping system other than a main, riser or stack.
●● Branch interval
Answer: A VERTICAL LENGTH OF SOIL OR WASTE STACK at least
8 ft in height, between the connections of horizontal branches to a
drainage system.
●● Branch vent
Answer: A vent connecting one or more individual vents with a vent
stack or stack vent
●● Building Drain
QUESTIONS AND CORRECT ANSWERS
STUDY GUIDE
●● Air Admittance Valve (AAV)
Answer: One-way valve designed to allow air to enter the plumbing
drainage system when negative pressure develops in the piping system.
●● Air Break (Drainage System)
Answer: An arrangement in which a discharge pipe from a fixture,
appliance or device drains indirectly into a receptor below the flood-
level rim of the receptor, and above the trap seal.
●● air gap
Answer: Indirect waste arrangement where the waste is discharged to the
drainage system through piping that terminates at a specific distance
above the flood level rim. ( 2 times the pipe size, never less than 1 inch)
●● Area Drain
Answer: A receptor designed to collect surface or storm water from an
open area
●● Backflow
, Answer: Unwanted reverse flow of contaminants through a cross-
connection into a potable water system. It occurs when the pressure in
the potable water supply drops below the pressure of the contaminated
supply.
●● Back siphonage
Answer: backflow due to negative pressure
●● Back water valve
Answer: a device installed in a drainage system to prevent reverse flow .
●● branch
Answer: any part of the piping system other than a main, riser or stack.
●● Branch interval
Answer: A VERTICAL LENGTH OF SOIL OR WASTE STACK at least
8 ft in height, between the connections of horizontal branches to a
drainage system.
●● Branch vent
Answer: A vent connecting one or more individual vents with a vent
stack or stack vent
●● Building Drain
