NITC Journey Level Plumber Exam Questions

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61.

When dealing with a public lavatory in transient bathrooms, what must the maximum temperature be?

  • 120°F

  • 130°F

  • 110°F

  • 115°F

Correct answer: 120°F

Anytime the lavatory is for the public to use, it must be regulated at a max of 120°F. It may be less, but not higher. 

62.

Before an underground water supply passes an inspection, which of the following must be done with the piping? 

  • Tested and uncovered

  • Tested and covered

  • Tested and photographed

  • Covered and photographed

Correct answer: Tested and uncovered

The piping must be tested and uncovered in order for the inspection to happen. The piping may be photographed for future use and documentation is always helpful down the line, but it is not a needed process when discussing the inspection process. 

63.

Which type of gas piping can only be installed underground?

  • Polyethylene 

  • Black iron

  • Galvanized

  • PVC

Correct answer: Polyethylene

Polyethylene is only rated for below ground use and uses anodeless transition pieces to go above ground. The other three are not allowed to be installed underground and PVC is not rated for gas altogether.

64.

What is best described as a receptor that is designed to collect surface or storm water from an open area?

  • Area drain

  • Storm leader

  • Floor drain

  • Floor sink

Correct answer: Area drain

An area drain is the receptor for open areas and spaces to collect and receive standing water. This is different from a leader. The leader helps move the water from the roof to the ground. Floor drains and floor sinks are similar types of devices that do not handle storm water. 

65.

Under what circumstances can a gas line be drilled and tapped into?

  • Operating pressure under 5 psi 

  • Operating pressure of 10 psi 

  • Operating pressure of 15 psi

  • Operating pressure over 20 psi

Correct answer: Operating pressure under 5 psi

When drilling and tapping a gas line, one of the stipulations is that it must be on a system that is 5 psi and below. The other items are well outside of the range and would not be permitted to have it drilled and tapped. 

66.

If a system has a pressure of 2 psi and around 40 inches of water column, how much pressure should the test apply? 

  • 60 psi

  • 40 psi

  • 20 psi

  • 10 psi

Correct answer: 60 psi

The situation above states that the water column is above 14, so the test must be done at 60 psi for 30 minutes on test. 

67.

Which one of the following is a backflow preventer that handles high-hazard pollution?

  • Reduced principal zone assembly 

  • Air gap 

  • Atmospheric vacuum breaker

  • Hose connection vacuum breaker 

Correct answer: Reduced principal zone assembly

The reduced principal zone assembly is the only backflow preventer that can stop high-level pollutants from going into the potable water system through back pressure. The other options are backflow preventers but they cannot be used in high-hazard situations, like an automatic pool-filler.

(Refer to 2021 UPC 603.2)

68.

What is the minimum capacity of an oil interceptor that is servicing a three-stall facility?

  • 6 ft3

  • 8 ft3

  • 10 ft3

  • 12 ft3

Correct answer: 6 ft3

When talking about the capacity of interceptors, the number of vehicles served plays a big part. Where there are three vehicles or less, the interceptor must be at a minimum of 6 ft3. If there are more, then the size must increase as well. 

69.

Which of the materials below cannot have a push style fitting installed?

  • Malleable iron

  • Copper 

  • Poly 

  • PVC

Correct answer: Malleable iron

Push fittings are designed for an array of different materials and sizes of piping, but malleable iron is the one that does not have any that are manufactured for its material, regardless of its use for either gas or water. The others are all capable of having a push connect fitting on them. 

70.

What is the minimum size of a tailpiece for a lavatory, and other similar fixtures? 

  • 1.25 inches 

  • 1.5 inches

  • 2 inches

  • 3 inches

Correct answer: 1.25 inches 

The minimum size tailpiece for any continuous waste and fixture tailpieces must be at a minimum of 1.25 inches. The traps may be bigger, but the most common size of the lavatories tailpieces will be 1.25 inches.  

71.

Supporters and hangers must be installed in a way that             interfere with free expansion and contraction of the piping.  

  • doesn't 

  • does

  • may

  • must

Correct answer: doesn't 

The piping for fuel systems does not usually have reactions to internal expansion and contraction but they can react to external changes in temperatures. With that being said, the piping and supports must allow that to happen freely if it occurs. 

72.

If you drop from 90 psi to 72.6 psi just off of elevation pressure loss, how many feet in elevation are added?

  • 40 feet

  • 30 feet

  • 60 feet 

  • 80 feet

Correct answer: 40 feet

With pressure losses due to elevation, refer to the UPC chart below. In this scenario, we traveled 40 feet in elevation and lost 17.4 psi.  

(Refer to 2021 UPC Table 612.5.3.2(3))

73.

Which of the fixtures below are not needed to meet the basic requirements of sanitation and hygiene?

  • Hose bib

  • Water closet

  • Lavatory

  • Bathtub/shower

Correct answer: Hose bib

A hose bib is not one of the fixtures that are needed in order to meet the code's standard of sanitation and hygiene. A water closet, lavatory, kitchen sink, shower/tub are needed in order to meet the requirements. 

74.

Based on the common venting tables, what percentage of the maximum vent capacity does a 45 degree elbow decrease by?

  • 5%

  • 10%

  • 2.5%

  • 15%

Correct answer: 5% 

Maximum vent capacity decreases by 5% when a 45 degree elbow is used.

If a 90 degree elbow was used, maximum vent capacity would decrease by 10%. The more elbows that are used on a combustion venting system, the less distance you can travel.

(Refer to 2021 UPC 510.2.6)

75.

Which of the following is the abbreviation for cross-linked polyethylene? 

  • PEX

  • PE

  • PB

  • PVC

Correct answer: PEX

PEX is the abbreviation for cross-linked polyethylene.

PE stands for polyethylene which is used in underground gas, PB stands for polybutylene which is piping that is no longer used as water piping. PVC which is used mainly for DWV.

76.

When setting a water closet, the measurement from a wall to the center of the water closet must be no less than            inches.

  • 15

  • 12

  • 10

  • 8

Correct answer: 15

Any partition or wall must have a minimum of 15 inches from that to the center of the water closet. There is not a situation that would allow less than 15 inches.

77.

Which of the following fixtures cannot be installed inside of a public bathroom?

  • Drinking fountain

  • Urinal 

  • Water closet

  • Hose bib 

Correct answer: Drinking fountains

Drinking fountains cannot be installed inside of toilet rooms, and a public bathroom is considered a toilet room. The other items are allowed to be installed inside of toilet rooms.

(Refer to 2021 UPC)

78.

____________  venting is not permitted to pass through an attic or concealed space.

  • Single wall

  • Double wall

  • PVC

  • Concentric 

Correct answer: Single wall

Single wall venting cannot pass through an attic or concealed space. It is permitted in certain applications, but this is not one of them. Double wall, PVC, and concentric venting are all able to travel through attics and concealed spaces.

79.

A combination                  and                    is a specialty waste piping system that utilizes the horizontal wet vent, along with common waste and vent piping.

  • waste, vent 

  • sewer, gas

  • water, vent

  • gas, vent 

Correct answer: waste, vent

The combination waste and vent system is a system that uses horizontal wet venting along with common waste and venting. The system uses adequately sized drainage and vent piping to allow free flowing air on the top side of the piping.

80.

When installing a pressure sewer system,                      are needed downstream of the check valve and gate valve.

  • cleanouts

  • sump pit

  • manhole

  • septic tank

Correct answer: cleanouts

Even on pressurized systems, there still need to be cleanouts after the check valve and gate valve and before it ties into the public sewer.