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NITC Journey Level Plumber Exam Questions
Page 7 of 25
121.
How often should 1/2 inch steel gas piping be supported?
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6 feet
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4 feet
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8 feet
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10 feet
Correct answer: 6 feet
In this situation, a 1/2 inch steel gas line should be supported every 6 feet. If the piping was the nominal size of tubing, it would need to be every 4 feet.
122.
How many traps can be installed on one trap arm?
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One
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Two
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Unlimited
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Three
Correct answer: One
One trap can be installed per trap arm. If there are multiple fixtures, each one should have its own trap.
123.
When repairs to copper water lines are needed to be done under a slab, what connection method must be used?
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Brazed
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Soldered
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Push fittings
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Mechanical fitting
Correct answer: Brazed
Anytime a repair or newly installed line has joints, either in or below a concrete slab, the joints must be brazed.
124.
What is the maximum length that a branch on a combination waste and vent system can run without having to be vented separately?
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15 feet
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6 feet
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12 feet
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10 feet
Correct answer: 15 feet
The maximum length that a branch on a combination waste and vent system can run without having to be vented separately is 15 feet.
All of the other options are acceptable lengths that a branch can run, but 15 feet is the maximum length before needing additional vents.
125.
An accessible must be installed for each vent on a combination waste and vent system.
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cleanout
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vent
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trap
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backwater valve
Correct answer: cleanout
An accessible vent must be installed on the combination waste and vent system for future cleaning if required. If it is a wet vent system, cleanouts are not required if the trap arm is not less than 2 inches. Vent, trap, and back water valves are not the proper answer for the scenario described above.
126.
The pipe is the pipe that receives the discharge of water closets, urinals, and other fixtures that collect and remove domestic sewage.
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soil
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vent
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water
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sewer
Correct answer: soil
The soil pipe is the term called for collecting and removing any domestic sewage. Venting, water and sewer are not proper descriptions of the above.
127.
Which of the following best describes a device that is installed on a drainage system that can prevent reverse flow?
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Backwater valve
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Check valve
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Backflow preventer
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Double check
Correct answer: Backwater valve
The backwater valve is installed in the event that there was a backup outside of the home so that the home would be more protected from any damage from a backup. It could still backup if the problem was severe enough. The other devices are backflow preventers but they are designed for potable water systems, not drainage systems.
128.
When appliances are mounted on rooftops, how much clearance must be designated?
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30 inches
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24 inches
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28 inches
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20 inches
Correct answer: 30 inches
When appliances are mounted on rooftops, 30 inches clearance must be designated.
129.
Systems that have systems with regulators are allowed to have a by-pass if it is:
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regulated
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accessible
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visible
-
inspected
Correct answer: regulated
There is an exception that if there is the need for service, a system with a regulator can have a bypass, but it must also be regulated in the same way. Although it may be accessible, visible, and permitted, it must be regulated in order to be installed.
130.
The pressure that is left over after all of the friction loss, head pressure, and the other losses during demand is called:
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residual
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static
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elevated
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reduced
Correct answer: residual
This is the opposite of static, and is the working pressure available after all of the other factors are taken into account, such as friction loss, head pressure, and the total pressure loss experienced under demand use. The others do not fit the description above. They describe the abundance, or shortage, of pressure.
131.
Using these three indicators, the inlet pressure of less than 2 psi, a pressure drop of 0.5 inches of water column, and a specific gravity of 0.6, what is the type of fuel this chart serves?
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Natural Gas
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Propane
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Oil
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Gasoline
Correct answer: Natural gas
It is important to navigate the charts and know which charts are what, based upon all of the different scenarios of different pressures and pressure drops. Propane charts will be very different. Oil and gasoline charts won't be in the 2021 UPC, but they may be found in the 2021 IRFGC 2021.
132.
Which of the following is the process of capillary action?
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Soldered joints
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Threaded pipe
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Solvent joint
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Flared joints
Correct answer: Solder
When soldering, the heat is applied to the socket of the fitting after the pipe and the fitting have been thoroughly cleaned and fluxed. Once the fitting is hot enough, the process of capillary action occurs where it sucks in the solder around the fitting and pipe.
133.
Depending on the local frost depth, how deep should a water service line be buried?
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12 inches below local frost depth
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8 inches below local frost depth
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10 inches below local frost depth
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14 inches below local frost depth
Correct answer: 12 inches below local frost depth
A water service line should be buried 12 inches below the local frost depth. Always refer to the Authority Having Jurisdiction (AHJ) in regard to the depth required along with the local frost depth levels.
134.
When using shielded couplings on cast iron, how often must the piping be supported?
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Every 4 feet
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Every 5 feet
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Every 6 feet
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Every 7 feet
Correct answer: Every 4 feet
When using cast iron that connects with no hub fittings or an elastomeric shielded coupling, the piping must be supported every 4 feet, or every other joint unless it spans over 4 feet. It is not permitted to be supported any more than 4 feet.
135.
What is the proper way to protect a hot water storage tank from excessive pressure?
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Temperature and pressure relief valve
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Expansion tank
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Check valve
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Thermal expansion valve
Correct answer: Temperature and pressure relief valve
The temperature and pressure relief device is what protects the unit from excessive pressure. The expansion tank and thermal expansion valve are devices that can help with thermal expansion but not with excessive pressure. The check valve only allows water to move in one direction and not allow the water to flow back.
136.
Valves for gas systems be located in plenums and drop ceilings.
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cannot
-
shall
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may
-
qill
Correct answer: cannot
Valves that are needed for the gas piping system must not be located in any plenum or dropped ceiling. They must be readily accessible.
137.
When an air gap or an air break is needed, what should the minimum distance be from the flood level of the basic to the lowest point of the indirect waste?
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1 inch
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1/2 inch
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2 inches
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4 inches
Correct answer: 1 inch
The gap or break between the flood rim must be at minimum 1 inch between the two. It may be further but no less. 1/2 inch, 2 inches, and 4 inches are not acceptable in this scenario because we are looking for the minimum distance.
138.
Which of the following would need an elongated toilet?
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Employee restroom
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Condo
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Single family residence
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Private apartment
Correct answer: Employee restroom
This is strictly based on the needs for public use. Anytime the bathroom is open to the general public, it needs to be elongated.
The other three options are all private dwellings and have the choice of elongated or round toilets.
139.
What is the minimum length that the vent stack must terminate through the roof flashing when terminating vertically?
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6 inches
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8 inches
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10 inches
-
12 inches
Correct answer: 6 inches
A vent stack must terminate a minimum of 6 inches through roof flashing when terminating vertically.
140.
What is the minimum thickness of DWV (Domestic Waste and Vent) for an above-ground sanitary drainage system?
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Schedule 40
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Schedule 20
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Schedule 80
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Schedule 10
Correct answer: Schedule 40
Schedule 40 and up are approved for DWV above-ground piping.