NCCER PLUMBING LEVEL 4 EXAM
QUESTIONS WITH CORRECT EXPLAINED
ANSWERS || 100% GUARANTEED PASS!!
<RECENT VERSION>
1. Two pipes connecting to deep well jet assembly. one of them is 1. 1/4 inches
suction line. what is the other pipe? - ANSWER ✔
a one inch drive line
2. Best way to increase the volume of water flow through a distribution
system- ANSWER ✔
increase pipe size
3. Pressure at the discharge of a submersible pump is directly related to-
ANSWER ✔
number of impellers
4. An area shut off for medical system should be- ANSWER ✔
a ball valve
5. Proper height for urinal- ANSWER ✔
average height of the person using it
6. Term for suspending multiple pipes together- ANSWER ✔
trapeze hangers
7. Which code covers the requirement for firestopping within a building-
ANSWER ✔
National building code
8. The purpose of a baffalty on the outlet of a septic tank- ANSWER ✔
, to retain the scum layer
9. Other than thrust blocks, how can underground piping be protected from
separating? - ANSWER ✔
continuous rodding
10.What is required on water distribution piping supplying each floor of a high-
rise? - ANSWER ✔
PRV pressure reducing valve
11.What's required on the downfed heat transfer unit? - ANSWER ✔
isolation valves and a drain
12.What would be the installation sequence of a water softener, sand filter and
carbon filter? - ANSWER ✔
carbon filter, sand filter, water softener
13.How should a float switch be wired to pump supplying a water cooling
tower? - ANSWER ✔
In series with and upstream of the pump
14.What is most likely cause of low production flow from an existing jet pump?
- ANSWER ✔
leak in the suction piping
15.what's the result of backslipenage on an electric hot water tank- ANSWER
✔
elements will burn out
16.What types of discharge may be used to prime a trap? - ANSWER ✔
deli display case and a shower head
17.Discharge from a close washer would be termed- ANSWER ✔
sewage
18.Maximum length of a fixture outlet pipe to grease interceptor- ANSWER ✔
1200 millimeters
, 19.What is the term given to thickened area of a floor drain that can be drilled
and taped? - ANSWER ✔
Abboss
20.If sewage discharge may be impaired, what must be done? - ANSWER ✔
properly treated before entering the system
21.How must event from a sump be terminated- ANSWER ✔
same as any other vent
22.Where is the discharge from a sewage sump supposed to terminate? -
ANSWER ✔
into the building drain downstream of the trap
23.How is a steam made installed in a steam system? - ANSWER ✔
graded down and away from the boiler at 1 inch for 20 ft
24.What is a spool drawing? - ANSWER ✔
isometric drawing part of the prefabricated piping system
25.What is wrap around used for- ANSWER ✔
to make a square straight cut around a pipe
26.What is a thread- o -let- ANSWER ✔
a threaded branch welded into steel pipe
27.What type of cutting wheel is used for ABS pipe- ANSWER ✔
large diameter for large pipes. small diameter for small pipe
28.What is the smallest drain pan outlet for 3/4 inch T&P relief valve? -
ANSWER ✔
1¼"
29.When attaching wire rope clips to create a loop, which clip is installed first?
- ANSWER ✔
The farthest from the thimble, nearest the thimble, then the middle thimble
QUESTIONS WITH CORRECT EXPLAINED
ANSWERS || 100% GUARANTEED PASS!!
<RECENT VERSION>
1. Two pipes connecting to deep well jet assembly. one of them is 1. 1/4 inches
suction line. what is the other pipe? - ANSWER ✔
a one inch drive line
2. Best way to increase the volume of water flow through a distribution
system- ANSWER ✔
increase pipe size
3. Pressure at the discharge of a submersible pump is directly related to-
ANSWER ✔
number of impellers
4. An area shut off for medical system should be- ANSWER ✔
a ball valve
5. Proper height for urinal- ANSWER ✔
average height of the person using it
6. Term for suspending multiple pipes together- ANSWER ✔
trapeze hangers
7. Which code covers the requirement for firestopping within a building-
ANSWER ✔
National building code
8. The purpose of a baffalty on the outlet of a septic tank- ANSWER ✔
, to retain the scum layer
9. Other than thrust blocks, how can underground piping be protected from
separating? - ANSWER ✔
continuous rodding
10.What is required on water distribution piping supplying each floor of a high-
rise? - ANSWER ✔
PRV pressure reducing valve
11.What's required on the downfed heat transfer unit? - ANSWER ✔
isolation valves and a drain
12.What would be the installation sequence of a water softener, sand filter and
carbon filter? - ANSWER ✔
carbon filter, sand filter, water softener
13.How should a float switch be wired to pump supplying a water cooling
tower? - ANSWER ✔
In series with and upstream of the pump
14.What is most likely cause of low production flow from an existing jet pump?
- ANSWER ✔
leak in the suction piping
15.what's the result of backslipenage on an electric hot water tank- ANSWER
✔
elements will burn out
16.What types of discharge may be used to prime a trap? - ANSWER ✔
deli display case and a shower head
17.Discharge from a close washer would be termed- ANSWER ✔
sewage
18.Maximum length of a fixture outlet pipe to grease interceptor- ANSWER ✔
1200 millimeters
, 19.What is the term given to thickened area of a floor drain that can be drilled
and taped? - ANSWER ✔
Abboss
20.If sewage discharge may be impaired, what must be done? - ANSWER ✔
properly treated before entering the system
21.How must event from a sump be terminated- ANSWER ✔
same as any other vent
22.Where is the discharge from a sewage sump supposed to terminate? -
ANSWER ✔
into the building drain downstream of the trap
23.How is a steam made installed in a steam system? - ANSWER ✔
graded down and away from the boiler at 1 inch for 20 ft
24.What is a spool drawing? - ANSWER ✔
isometric drawing part of the prefabricated piping system
25.What is wrap around used for- ANSWER ✔
to make a square straight cut around a pipe
26.What is a thread- o -let- ANSWER ✔
a threaded branch welded into steel pipe
27.What type of cutting wheel is used for ABS pipe- ANSWER ✔
large diameter for large pipes. small diameter for small pipe
28.What is the smallest drain pan outlet for 3/4 inch T&P relief valve? -
ANSWER ✔
1¼"
29.When attaching wire rope clips to create a loop, which clip is installed first?
- ANSWER ✔
The farthest from the thimble, nearest the thimble, then the middle thimble
