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Quiz Session - Attempts With Random Questions

NITC Journey Level Plumber Exam Questions

Page 2 of 25

21.

The __________ sizes of vertical, horizontal, or both drainage piping must be sized based on the total of drainage fixture units that they are connected to.

  • minimum

  • maximum

  • standard

  • largest

Correct answer: minimum 

The standards of the UPC is always based on the minimum standards that are needed for the system to operate properly. The load calculation must take in account all fixtures that tie into that system in order to size it properly. The system can always be increased within the standards of the building code but it is usually not needed.

22.

For systems carrying less than 14 inches of water column, the pressure test should be set at              psi and they must hold for 15 minutes.

  • 10 

  • 20

  • 30

  • 60

Correct answer: 10 

If the system is supplying higher than 14 inches of water column, then the test would need to be performed at 60 psi and it must hold for 30 minutes. For systems below 14 inches of water column, the test at 10 psi and holding for 15 minutes are the right parameters. 

23.

Cleanouts installed under concrete or asphalt paving should be made __________ by yard boxes or by extending flush with the pavement.

  • accessible 

  • tamper-proof 

  • of plastic

  • wrapped

Correct answer: accessible 

The cleanouts must be accessible, meaning in a yard box which blocks out the concrete or asphalt around the cleanout, or extending it to the top of the finished concrete or asphalt. They do not need to be tamper-proofed, plastic, or wrapped. 

24.

Trough-type and invisible seal urinals must                   be installed.

  • Never

  • Always

  • Sometimes

  • Occasionally 

Correct answer: never

These types of urinals are prohibited and cannot be installed no matter the situation or circumstances. 

25.

Where is the trap of a water closet located?

  • In the water closet

  • Under the water closet

  • In the soil stack 

  • In the closet bend

Correct answer: In the water closet

The trap is integrated into the toilet, so a lot of the rules around traps in general don't apply to water closets because they are unique. For example, the vent pipe opening from soil or waste pipe must always be above the weir of the trap for all fixtures except water closets. 

26.

If you have a 1.25 inch steel gas pipe that runs through multiple floors, when must it be supported?

  • Every floor level

  • Every 8 feet

  • Every 6 feet 

  • Every 4 feet 

Correct answer: Every floor level

Any piping that is 1.25 inches and larger that is run vertically must be supported at every floor level.

27.

Where cleanouts can cause a hazard, what must be installed?

  • Countersunk plugs

  • Raised plugs

  • Caution sign

  • Painted cleanout plug 

Correct answer: Countersunk plugs

If there is a situation where a cleanout is in a heavy foot traffic area or anywhere that could cause someone to trip, the countersunk plug is what is needed to be installed. The other methods may be beneficial but they do not meet code. 

28.

Flush tanks in water closets must be provided with                 that will discharge into the water closet or urinal that is connected in the event that it runs.

  • overflows

  • floats

  • flushes

  • bypass

Correct answer: overflows 

The flush tanks must have an overflow tube that will allow the water to go directly into the bowl of the water closet. This allows safety if the toilet were to run continuously with no use. The other items are not suitable fixes for the scenario above. 

29.

Which of the following shower drains would not be permitted due to size?

  • 1.5 inches

  • 2 inches

  • 3 inches

  • 4 inches

Correct answer: 1.5 inch

The shower drain receptors must have a minimum of 2 inch outlets, so the 1.5 inch outlet would not be an acceptable size drain for a shower. Depending on the size of the shower, the other sizes could be used to handle more drainage fixture units.

30.

Copper and copper alloy piping may not be used on gas system piping if the gas contains more that           grains of hydrogen sulfide per 100 standard cubic feet.

  • 0.3

  • 0.2

  • 0.0

  • 0.1

Correct answer: 0.3

This is specified in the code book. This requires asking the gas supplier where their supply is at when it comes to that threshold of 0.3 grains of hydrogen sulfide per 100 standard cubic feet. Since the others are below the 0.3 grains of hydrogen sulfide, copper or copper alloy would be allowed.

31.

When should dielectric unions be used?

  • When two dissimilar metals connect

  • When PEX attaches to copper

  • When copper attaches to copper

  • When PEX attaches to PVC

Correct answer: When two dissimilar metals connect 

Dielectric unions should be used when two dissimilar metals connect. A perfect example of this would be galvanized iron pipe and copper needing to be connected. This would be required to prevent galvanic corrosion. 

32.

Which of the following are not considered protective devices?

  • Shut-off valves

  • Check valves 

  • Three way valves

  • Reverse flow indicators 

Correct answer: Shut-off valves

The shut-off valve is not considered a method back protective devices when it comes to fuel code. The other three devices are approved to be back pressure protective devices. 

33.

Systems that serve appliances of                water column must be equipped with an overpressure device.

  • 14 inches

  • 2 inches

  • 8 inches

  • 11 inches

Correct answer: 14 inches

Anytime the system is serving, appliances that are designed to operate at 14 inches of water column, or more, must have these systems installed. This is most commonly seen in kitchens and commercial settings.

34.

Sand receptors are required where the Authority Having Jurisdiction deems it necessary to protect the:

  • drainage system

  • soil

  • building

  • ground water

Correct answer: drainage system

The Authority Having Jurisdiction is the one that makes the call if it needs a sand interceptor. They do this based on the waste that's being processed and if they deem it necessary to protect the drainage system, then it is required. The other answers may benefit from the decision but they are not the sole indicators of why it is needed. 

35.

When determining the size of a meter, the                       length of supply pipe is considered by the location of the meter to the furthest fixture.

  • developed

  • desired

  • designed

  • designated 

Correct answer: developed 

Developed length is a term that will be brought up whenever sizing distribution systems. This accounts for the worst case scenario of what will be needed to deliver water or fuel under all circumstances. The other answers could be the design on paper, but these don't always replicate what is occurring in the field.

36.

An assembly of equipment and piping that is used to distribute nonflammable gases is called:

  • Medical gas system

  • Gas piping system

  • Water supply system

  • Waste supply system 

Correct answer: medical gas system

The medical gas system is in charge of distributing oxygen, nitrous oxide, compressed air, carbon dioxide, and helium. These constitute non-flammable gasses.  

37.

Horizontal drain piping should have a cleanout on both ends if the run is over:

  • 100 feet

  • 50 feet

  • 75 feet

  • 90 feet

Correct answer: 100 feet

If the horizontal run is more than 100 feet, there must be a cleanout on both ends, and this must be repeated in situations where there are long distance runs back to back. 

38.

Where must a shut-off be installed on a water heater?

  • Cold side

  • Hot side 

  • Both hot and cold side

  • Temperature relief valve 

Correct answer: Cold side

The code states that a shut-off valve must be installed on the cold side inlet of the water heater. It does say that you can install one on the hot side, but it isn't required. Installation on the temperature relief valve is against both of those requirements and should never be done.

39.

When utilizing a wet vent, additional fixtures must be discharged                    of the wet vent system and be conventionally vented.

  • downstream 

  • upstream 

  • at the inlet

  • in the vent

Correct answer: downstream

When adding in additional fixtures to a wet vented system, they must be tied into the drain line downstream of the wet vent and cannot tie into the inlet side, upstream, and they cannot be tied into the vent stack. 

40.

                       pressure is the existing pressure without any flow.

  • Static 

  • Residual 

  • Reduced

  • Elevated 

Correct answer: Static 

Static pressure is the standing pressure without any flow throughout the system. This is recommended to be no higher than 80 psi. Residual pressure is what is the standing pressure when there is flow going through the system. Reduced and elevated pressure are usually caused by external factors. 

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