×

Quiz Session - Attempts With Random Questions

NITC Journey Level Plumber Exam Questions

Page 5 of 25

81.

Potable water systems and sewer systems can only be connected if there is a                      installed.

  • backflow

  • frostproof hosebib

  • trap primer

  • floor drain

Correct answer: backflow 

The only time the potable water system and the sewer system can be connected is when some sort of backflow prevention is in the system. This can be accomplished in multiple ways, such as with an atmospheric vacuum breaker on a urinal or a double check, as two examples. The other items are not directly needed when it comes to backflow devices.

82.

Which of the following does not require indirect waste? 

  • Hand sink

  • Culinary sinks

  • Ice machines

  • Commercial dishwashing machines 

Correct answer: Hand sink

When it comes to food handling areas, the risk for cross connections increases. The hand sink is the one fixture that does not require indirect waste and it must be tied into the sanitary sewer that is trapped and vented. All the others must have an indirect waste.  

83.

What is the elevation that is gained if you lose 4.4 psi of water pressure?

  • 10 feet

  • 5 feet

  • 20 feet

  • 15 feet 

Correct answer: 10 feet

The amount of pressure that is lost every 5 feet is 2.2 psi. 2021 UPC Table 612.5.3.2(3) shows that the pressure loss would be up to 40 feet in elevation changes. 5 feet and 2.2 lost in pressure is a good way to remember and do some simple math when in the field. The others are incorrect.

84.

Which of the following fittings would be best to transition from copper to galvanized steel?

  • Dielectric union

  • Coupling

  • Compression coupling 

  • Union

Correct answer: Dieletric union

The dielectric union is used when transitioning between two dissimilar metals to help deter corrosion between the two metals. The other fittings are not acceptable when attaching two dissimilar metals. 

85.

Any threaded fittings larger than            inches must not be used.

  • four

  • three

  • six

  • two

Correct answer: four 

Any threaded fitting larger than four inches must not be used. 

86.

A regulator that has a vent                  device is the only exception to a regulator being installed inside without a vent, 

  • limiting 

  • by-pass

  • termination

  • meter

Correct answer: limiting 

The vent limiting device limits the amount of gas that escapes by utilizing a ball check that closes if the diaphragm were to rupture. These are approved methods of installing a regulator indoors without a vent.

87.

When threading into a female PVC fittings, what material must the male be constructed with?

  • PVC

  • Copper

  • Brass

  • Stainless

Correct answer: PVC

Anytime this connection occurs, there are no exceptions. The equipment must stay the same. PVC female fittings frequently fail when threaded with a metal material, causing failure very quickly.

88.

The underground water service can be run in the same ditch as the building drain piping if it is separated at least                          horizontally. 

  • 1 foot 

  • 2 feet

  • 6 inches

  • 3 feet 

Correct answer: 1 foot

As long as the water services have a 1 foot clearance from the building drain, sewer, or any other system, they can be run in the same ditch or chase. 

89.

What is it called when the Authority Having Jurisdiction has reasonable cause to think that there are unsafe, unsanitary, dangerous, or hazardous situations on the premises?

  • Right of entry

  • Exempt Work

  • Permitting

  • Inspection

Correct answer: Right of entry

This isn't a common practice, but when needed it can be enforced. The main part of the code is to protect the public in all different types of ways and this is one of those items that can trickle over into public service. Other service departments may be needed to help enforce them.

90.

An anodeless fitting that is used to transition underground gas to above ground is called a:

  • transition riser

  • elbow

  • street 90 

  • coupling 

Correct answer: transition riser

Transition risers are used when transitioning from poly pipe that is underground that will transition to hard pipe. The elbow, street 90, and coupling are all fittings that will be seen above ground or below, not as a transition.

91.

What is the minimum size required when sizing vents?

  • 1.25 inches

  • 1 inch

  • 1.5 inches

  • 2 inches 

Correct answer: 1.25 inches

The minimum size allowed for a vent is 1.25 inches. That doesn't mean every fixture can be run in 1.25 inches. It would need to meet the sizing requirements. No vents can be run on anything less than 1.25 size piping. 

92.

On a natural gas system with 8 inches of water column and a pressure drop of 3 inches of water column, how many cubic feet of gas per hour is available for a 1.25 inch line that is 50 feet long?

  • 1540

  • 2300

  • 2090

  • 3670

Correct answer: 1540

The factors that indicate which table to use are the natural gas system, 8 inches of water column, and the pressure drop of 3 inches of water column.

(Refer to 2021 UPC Table 1215.2(2))

93.

What is the minimum required clearance in front of a shower? 

  • 24 inches 

  • 20 inches

  • 22 inches

  • 18 inches

Correct answer: 24 inches

The minimum required distance for clearance in the front opening of the shower must be 24 inches. It cannot be any less than that. 

94.

If there is a 3 inch trap arm, what is the maximum distance it can be in length?

  • 72 inches

  • 48 inches

  • 60 inches

  • 120 inches

Correct answer: 72 inches 

If there is a 3 inch trap arm, what is the maximum distance it can be in length is 72 inches. The trap arm size dictates how far the trap arm can travel in length.

(Refer to 2021 UPC Table 1002.2)

95.

Polyethylene piping that is used for gas piping must be marked:

  • gas

  • high pressure

  • service

  • fuel 

Correct answer: gas 

The pipping must be labeled gas, pipe manufacturers have started to incorporate that in the lettering. This is helpful to not get the piping confused. It can be colored yellow or black. High pressure, service, or fuel piping would not be what is found in the lettering of the pipe.  

96.

What is the minimum distance required for the critical level of an atmospheric vacuum breaker?

  • 6 inches 

  • 4 inches

  • 2 inches 

  • 8 inches 

Correct answer: 6 inches 

Any time there is an atmospheric vacuum breaker on a system, usually in the case of potable water feeding a water closet or a urinal, it must not be less than 6 inches. It can be more if needed to accommodate the flushometer. 

97.

The spacing between the spout of the faucet and the rim of the sink is called a(n):

  • air gap 

  • air break 

  • aerator

  • drain assembly 

Correct answer: air gap 

The space is called an air gap. This is also the same concept as the tub spout spacing from the flood level of the tub or basin. An air break is technically not sufficient in this application and the other two components are pieces of the faucet and drain.  

98.

When utilizing a wet vent, fixtures that are not apart of that bathroom group must be tied __________ of the wet vent.

  • downstream

  • upstream

  • together 

  • separate 

Correct answer: downstream 

Any fixtures that are not apart of the bathroom group that is wet vented, must tie in downstream of the wet vent and it must also be vented separately. Any answer besides downstream would be incorrect. 

99.

                    are prohibited from being on the bottom of a temperature relief valve piping.

  • Threads

  • 45 degree fittings

  • 90 degree fittings 

  • Couplings 

Correct answer: Threads

This is to deter a threaded cap from being put on in the event that the relief valve begins to leak. If that does occur, the water heater then becomes very unsafe and will have the potential to cause harm and damage, 

100.

No waste piping should be installed outside, attics or crawl spaces, or in exterior walls unless necessary. This is to prevent:

  • freezing 

  • tampering

  • backflow

  • back-ups

Correct answer: freezing 

In regions where freezing is possible, this is enforced more strictly because it can directly affect the whole system. It is best practice to avoid having waste pipes in any of the locations above. 

×