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Quiz Session - Attempts With Random Questions

NITC Journey Level Plumber Exam Questions

Page 3 of 25

41.

What is the minimum distance that a water closet or bidet can be installed next to another plumbing fixture?

  • 30 inches center to center

  • 24 inches center to edge

  • 32 inches center to center

  • 40 inches center to edge

Correct answer: 30 inches center to center

When installing a water closet or bidet, the center line of the neighboring fixture must be a minimum of 30 inches away.

(Refer to 2021 UPC 402.5)  

42.

                    venting is limited to vertical drainage piping that can accept up to four fixtures as long as they are within 6 feet in developed length.

  • Wet

  • Yoke

  • Drainage

  • Air Admittance

Correct answer: Wet

The situation above is directly related to wet venting and its limitations. The other answers below are not directly related to the sentence above although they are a part of the venting system as a whole. 

43.

When malleable iron fittings are used on water systems, what is the necessary difference that is required for those fittings?

  • They must be galvanized.

  • They must be black iron.

  • They must have dielectric unions.

  • They must be grounded.

Correct answer: They must be galvanized.

The main difference is that these malleable fittings must be galvanized. This is the process that allows a material to be less corrosive over time. The other items are not directly required for the scenario above, although they may be a part of the bigger system.

44.

When installing a domestic dishwasher to the sanitary sewer, which of the following must be installed?

  • An approved air gap

  • Check valve

  • Backwater valve

  • Garbage disposal

Correct answer: An approved air gap

The approved air gap is the only way to properly discharge the drain for a domestic dishwasher.

The check valve and back water valve are not approved devices in this scenario. If a dishwasher drain is tied into a garbage disposal, it still must have an approved air gap. 

45.

The system has a pressure of 75 psi, the maximum length is 1000 feet, and the meter is 3/4 inch. There are 11 WSFUs available. What size is the main water line coming into the dwelling?

  • 1 inch 

  • 3/4 inch

  • 1.25 inches

  • 2 inches

Correct answer: 1 inch 

With all of the parameters above, you can identify each one and help navigate the 2021 UPC Table 610.4. This situation gives us all the information except the size of the main water line. There is only one option, which is 3/4 inch meter along with the distance provided and the pressure provided. Then you can follow that cell back to the column that has the main water line size.

46.

What type of material should a plumbing fixture be constructed of?

  • Dense, durable, and non-absorbent

  • Durable, water-proof, and flexible

  • Dense, flexible, and porous 

  • Durable, dense, and flexible 

Correct answer: Dense, durable, and non-absorbent

A material used for a plumbing fixture should be constructed of dense, durable, and non-absorbent material. The other options do not contain the necessary traits per section 401.2.

47.

The seal of the trap is made with:

  • water

  • air

  • brass bearing

  • brass spring

Correct answer: water

The active seal is through the use of water, whether waste water or fresh incoming water. Air is what is implemented to ensure that no traps are siphoned through the use of vents. The other two items are not applicable in this scenario. 

48.

Which of the following best describes a mixing valve that senses incoming hot and cold water pressures, that can help compensate if there are fluctuations in pressure?

  • Pressure-balancing valve

  • Check valve 

  • Gate valve 

  • Ball valve 

Correct answer: Pressure-balancing valve 

The pressure balancing valve allows a steady stream of tempered water no matter what else is occurring in the rest of the system. This is in every shower system that is up to code.

The check valve, ball valve, and gate valve do not balance the two types of water. 

49.

If you have 2 inch steel piping, it must be supported every          feet.

  • 10 

  • 12

  • 8

  • 4

Correct answer: 10 

Any piping 1.25 inches and above must be supported every 10 feet. 

(Refer to 2021 UPC Table 1210.3.5.1)

50.

If you have a static pressure of 120 on a potable water system, what must be installed?

  • Pressure regulating valve

  • Booster pump

  • Reduced pressure zone assembly

  • Check valve

Correct answer: Pressure regulating valve

Any static pressure that is above 80 psi, a pressure regulating valve must be installed in order to protect the system from excessive wear and tear. The booster pump is designed to elevate pressures, the reduced pressure zone assembly is for cross connections and the check valve is to direct water one way. 

51.

What is the max velocity that cold copper water systems must not exceed?

  • 8 ft/s

  • 10 ft/s

  • 12 ft/s

  • 14 ft/s

Correct answer: 8 ft/s

This is the threshold for the UPC code that must not exceed above 8 ft/s to help with the longevity of the system. The faster the water is traveling through the pipe, the more turbulent the water becomes, which over time erodes the pipe.

52.

When attaching a trap to a 1.5 inch waste stack, what is the maximum length that the trap arm can run horizontally?

  • 42 inches

  • 60 inches

  • 30 inches

  • 72 inches 

Correct answer: 42 inches

The horizontal trap arm chart helps navigate the different sizes of trap arms and limitations depending on the line you are working with. A 1.5 inch size trap arm can run anywhere from 4 inches all the way to 42 inches. 

53.

When four or more water closets are tied to a drainage stack that also carries waste from above, a                    vent must be installed.

  • relief

  • circuit

  • yoke 

  • wet 

Correct answer: relief

The concept for the relief vent is to make sure there is adequate air flow in the instance where there are multiple water closets in a bank. This allows ample air flow to prevent siphonage or back pressure. 

54.

What is the minimum required depth of the liquid seal of a trap?

  • 2 inches

  • 4 inches

  • 1.5 inches

  • 3.5 inches

Correct answer: 2 inches

The seal of the trap can be 2–4 inches but the minimum requirement is 2 inches. 

55.

Which of the following devices helps keep p traps from drying up?

  • Trap primer

  • Floor drain grate

  • Sand interceptor 

  • Maintenance 

Correct answer: Trap primer

A trap primer is a device that either ties into the potable systems and distributes water occasionally to the trap that is at risk of drying up or it is one that takes excess water off the drain and diverts it to a trap that is at risk of drying up and allowing sewer gases into the dwelling. The others options do not do this.

56.

A water closet/ bidet must have                     and                      .

  • light, ventilation

  • light, door

  • door, ventilation

  • ventilation, outlet

Correct answer: light, ventilation 

Principle 16 is what states the requirements for toilets and bidets that are located in a compartment or their own room. In either scenario, they require that a light and ventilation are installed to meet the code requirements. A door or outlet is not required but may be installed for other purposes.

57.

What is the main purpose of a p-trap?

  • To seal sewer gases 

  • To prevent cross-connections

  • To prevent back-ups

  • To collect debris

Correct answer: To seal sewer gases

The main purpose of the p-trap is to prevent any sewer gasses from escaping into the building.

Backflow preventers prevent cross connections, backwater valves prevent back-ups when located upstream of the clog, and wye strainers are devices that can be installed on potable systems to catch large debris that may be present in the water.

58.

Which of the following is the only material that can be fusion welded?

  • Polypropylene

  • PE-RT

  • PEX-AL-PEX

  • CPVC

Correct answer: Polypropylene 

Polypropylene is the only material that can be used and connected through fusion welding. This can be done without fitting and with socket type fittings as well. The others are not permitted to be fusion welded.  

59.

When 1/2 inch steel gas piping is installed on a rooftop, how often should it be supported? 

  • 6 feet

  • 3 feet

  • 7 feet

  • 12 feet 

Correct answer: 6 feet

1/2 inch piping would need to be supported every 6 feet. 

The guidelines are based off of 2021 UPC Table 1210.3.5.1, whether they are talking about an installation on a roof or hanging in a warehouse. The method of how the pipes are secured can be a bit different. On the roof, support blocks are usually used, but sometimes wood can also be used.

60.

What venting method can be used in a bathroom located on the same floor level while using a horizontal vent? 

  • Wet vent 

  • Loop vent

  • Yoke vent

  • Circuit vent 

Correct answer: Wet vent

You are permitted to wet vent a whole bathroom group if it is on the same floor level. The other methods could be used, but not horizontally.

(Refer to 2021 UPC 908.2.1) 

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