NHIE 2020 EXAM QUESTIONS WITH ALL CORRECT ANSWERS
The main difference between brass and copper supply pipes is _______________.
a. brass pipes are magnetic and copper pipes aren't
b. brass pipes can be bent through a 7-inch radius and copper pipes can't
c. brass pipes have threaded joints an...
The main difference between brass and copper supply pipes is _______________.
a. brass pipes are magnetic and copper pipes aren't
b. brass pipes can be bent through a 7-inch radius and copper pipes can't
c. brass pipes have threaded joints and copper pipes have soldered joints
d. brass pipes use a different solder than copper pipes - Answer ✔ c. brass pipes have
threaded joints and copper pipes have soldered joints
Plumbing stacks should terminate ____ feet horizontally from a window.
a. 10
b. 18
c. 3
d. 6 - Answer ✔ a. 10
The on-site water supply volume is defined as ____________.
a. the quality of water supplied through the faucets
b. the rate of flow of water
c. the rate of pressure of the water supply, as determined by the local utility
d. when water empties from sinks at a reasonable rate without overflowing - Answer ✔
b. the rate of flow of water
T/F: Plumbing alterations should be reported because they may involve the use of
improper materials and poor technique.
True
False - Answer ✔ True
The main water supply line belongs to the _________.
a. city or county
b. property owner
c. the entity that owns the street's main valve
d. water company - Answer ✔ b. property owner
The minimum required size for a house's main water supply line is _____.
a. 1 inch
b. 1/2-inch
c. 3/4-inch
d. 7/8-inch - Answer ✔ c. 3/4-inch
Water hammer can be corrected by ____________.
a. changing supply pipes
,b. decreasing the water pressure
c. installing air chambers or shock absorbers
d. re-fastening loose pipes
e. re-fastening loose pipes and installing air chambers or shock absorbers - Answer ✔
e. re-fastening loose pipes and installing air chambers or shock absorbers
The most common supply piping material used in modern home construction is
__________.
a. concrete
b. copper
c. iron
d. plastic
e. steel - Answer ✔ b. copper
________ has been known to cause health problems when used in supply piping.
a. Copper
b. Iron
c. Lead
d. Polybutylene - Answer ✔ c. Lead
An anchoring ring that is secured to the floor is a _____.
a. water closet flange
b. lav bolt
c. toilet ring
d. wax ring device - Answer ✔ a. water closet flange
The inspector should evaluate the condition of a water heater for ____________.
a. its efficiency based on family size
b. its remaining life expectancy
c. proper connections to the hot and cold water supplies
d. the presence of a TPR valve
e. the presence of a TPR valve and proper connections to the hot and cold water
supplies - Answer ✔ e. the presence of a TPR valve and proper connections to the hot
and cold water supplies
The purpose of drainage traps is to prevent _________.
a. back-siphonage into the water supply
b. sewer gas from entering the house
c. sludge buildup in the sink - Answer ✔ b. sewer gas from entering the house
T/F: The inspector should determine if cross-connections are present in the plumbing
system.
True
False - Answer ✔ True
, The nominal voltage provided to most new-construction houses is _______ volts.
a. 110/208
b. 115/230
c. 120/208
d. 120/240
e. 60/120 - Answer ✔ d. 120/240
Electrical resistance _____________.
a. decreases with increasing wire diameter
b. increases with increasing wire diameter
c. is affected by wire insulation
d. is higher for copper than aluminum
e. is the only factor that determines the current-carrying capacity of the wire - Answer ✔
a. decreases with increasing wire diameter
The power available in a typical 15-amp, 120-volt household circuit is _____ watts.
a. 1,000
b. 1,500
c. 1,800
d. 3,600 - Answer ✔ c. 1,800
A damaged or nicked wire is a safety hazard because the ___________________.
a. damaged wire may corrode
b. effective resistance of the wire is increased, so the fuse can no longer adequately
protect the wire from overheating
c. wire's effective diameter has been decreased, thereby decreasing the resistance of
the wire - Answer ✔ b. effective resistance of the wire is increased, so the fuse can no
longer adequately protect the wire from overheating
T/F: Only circuit breakers can be used as over-current protection devices.
True
False - Answer ✔ False
The function of a drip loop is to _____________.
a. control a single circuit that serves more than one fixture
b. prevent current from leaking out of the electrical system
c. prevent water from entering the masthead
d. provide an alternate means of GFCI protection
e. provide grounding for the electrical system - Answer ✔ c. prevent water from entering
the masthead
If an auxiliary panel has been added, the wires connecting it to the main service panel
are protected by ________________.
a. a drip loop
b. overcurrent protection provided at the auxiliary panel end only if the wire is protected
in a rigid conduit that does not exceed 5 feet
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