NHIE - Plumbing and Structure
Question and answers already passed
2025/2026
The size of toilet waste pipe is __ inches. - correct answer ✔3
Interior wall plumbing supply pipe is __ inch. - correct answer ✔1/2
Requirements for plumbing vents: __ inches from a parapet wall, __ inches above a roof, and __ feet
from opening windows. - correct answer ✔12, 6, 10
The maximum length of flex gas tubing to a dryer is __ feet. Can flex gas pipe be cut? - correct answer
✔6, no
Which are larger, natural gas orifices or LP gas orifices? - correct answer ✔Nat Gas
What is the toilet discharge for a modern toilet? - correct answer ✔1.6 gpf
Must an inspector operate any outdoor faucet valves? - correct answer ✔Yes
Is an inspector required to inspect the operation of a backflow device? - correct answer ✔No
What is the most efficient and quiet toilet? - correct answer ✔A siphon action toilet
The recommended slope for waste discharge, i.e. plumbing drainpipes, is __ inch per foot. - correct
answer ✔1/4
, What type of trap is no longer used in residential construction? - correct answer ✔S-traps
P-traps should be within __ feet of an appliance. Why? - correct answer ✔2 feet, because of the
potential to siphon out trap with too great a distance.
What is the maximum acceptable length of individual plumbing distribution lines in manifold systems? -
correct answer ✔60 feet
The minimum height for a drain pan of a water heater is 1.5 inches. T or F? - correct answer ✔True
Cleanouts should be installed not more than __ feet apart. - correct answer ✔100
A water heater that has a drip pan must have a drain line that is a minimum diameter of __ inch or the
outlet diameter of the relief valve, whichever is larger. - correct answer ✔1
Supply shut off required for all fixtures except __ and __. - correct answer ✔Tub and shower
All but which plumbing fixture requires a drain strainer? - correct answer ✔A toilet.
The length from closet ring to vent is unlimited. T or F? - correct answer ✔True
Ballcock/antisiphon requires 1 inch air gap above overflow. T or F? - correct answer ✔True
A tub faucet must have a minimum __ inch air gap. - correct answer ✔2
The motor to a jetted tub must be accessible. T or F? - correct answer ✔True
Question and answers already passed
2025/2026
The size of toilet waste pipe is __ inches. - correct answer ✔3
Interior wall plumbing supply pipe is __ inch. - correct answer ✔1/2
Requirements for plumbing vents: __ inches from a parapet wall, __ inches above a roof, and __ feet
from opening windows. - correct answer ✔12, 6, 10
The maximum length of flex gas tubing to a dryer is __ feet. Can flex gas pipe be cut? - correct answer
✔6, no
Which are larger, natural gas orifices or LP gas orifices? - correct answer ✔Nat Gas
What is the toilet discharge for a modern toilet? - correct answer ✔1.6 gpf
Must an inspector operate any outdoor faucet valves? - correct answer ✔Yes
Is an inspector required to inspect the operation of a backflow device? - correct answer ✔No
What is the most efficient and quiet toilet? - correct answer ✔A siphon action toilet
The recommended slope for waste discharge, i.e. plumbing drainpipes, is __ inch per foot. - correct
answer ✔1/4
, What type of trap is no longer used in residential construction? - correct answer ✔S-traps
P-traps should be within __ feet of an appliance. Why? - correct answer ✔2 feet, because of the
potential to siphon out trap with too great a distance.
What is the maximum acceptable length of individual plumbing distribution lines in manifold systems? -
correct answer ✔60 feet
The minimum height for a drain pan of a water heater is 1.5 inches. T or F? - correct answer ✔True
Cleanouts should be installed not more than __ feet apart. - correct answer ✔100
A water heater that has a drip pan must have a drain line that is a minimum diameter of __ inch or the
outlet diameter of the relief valve, whichever is larger. - correct answer ✔1
Supply shut off required for all fixtures except __ and __. - correct answer ✔Tub and shower
All but which plumbing fixture requires a drain strainer? - correct answer ✔A toilet.
The length from closet ring to vent is unlimited. T or F? - correct answer ✔True
Ballcock/antisiphon requires 1 inch air gap above overflow. T or F? - correct answer ✔True
A tub faucet must have a minimum __ inch air gap. - correct answer ✔2
The motor to a jetted tub must be accessible. T or F? - correct answer ✔True
