2025 Edition

Plumbing Practice Test

This free plumbing practice test will give you an idea of the types of questions that appear on actual plumbing licensing exams. Plumbing exams vary by state but most all states and local plumbing jurisdictions have adopted either the IPC or the UPC plumbing codes. Typical exam sections include: fixtures, sanitary drainage systems, administrative policies, venting, indirect and special wastes, etc.

To prepare for your journeyman plumber test, use our Jouneyman Plumber Practice Test. Select the code year you need, 2021, 2018, 2015 or 2012 IPC/UPC. If you have questions on what code and code year applies to your plumber licensing test, check our Plumbing State Guides or contact your your testing jurisidction.

To prepare for a master plumber test, use our Master Plumber Practice Test.

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Administrative Policies and Procedures

1.	The provisions for licensing are determined by which of the following:
		a. State Board of Plumbing
		b. Authority having jurisdiction
		c. Plumbing inspector
		d. The responsible master plumber
The authority having jurisdiction determines the provisions for licensing. State Plumbing Boards determine requirements and provide testing of qualified applicants to become licensed. Plumbing inspectors enforce codes adopted by the AHJ. Incorrect answer. Please choose another answer.

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2.	Approved plans are required to be kept on a job site and available for inspection on demand by a code officer.
		a. True
		b. False
Before a plumbing permit is issued a set of plans and specifications are submitted to the code enforcement office. Once they are approved, a code officer will stamp them as approved and sign them. These become the official plans and specs for a job. This being the case, a copy of the stamped and signed plans and specifications must be kept on the job site at all times for review by a plumbing inspector. Incorrect answer. Please choose another answer.

3.	Who is allowed to apply for a plumbing permit?
		a. Homeowners who will perform their own work on their own homes
		b. Master plumbers
		c. Journeyman plumbers
		d. Both a and b
Journeyman plumbers are not allowed to apply for plumbing permits. All journeyman plumbers are required to work under the indirect supervision of a master plumber. A master plumber can obtain a plumbing permit. Homeowners who will perform their own plumbing work on their own homes are allowed to obtain permits. However, a homeowner is not allowed to obtain a plumbing permit and then allow some other person to do the plumbing work. Property owners are only allowed to be issued plumbing permits when the property where the work will be performed by the owner is the owner's personal residency. In other words, landlords are not allowed to obtain their own plumbing permits. Incorrect answer. Please choose another answer.

4.	Alterations made in an existing plumbing system are required to comply with current code requirements for plumbing systems.
		a. True
		b. False
Any plumbing alteration is expected to comply with current code requirements. At no time can an alteration be detrimental to a plumbing system or render the system unsafe. Some plumbers think that existing plumbing systems are exempt from current code requirements. This is true if the system is in safe operating condition. But, the moment an alteration to the system is made the alteration must be within current code requirements. However, the existing plumbing that is not being altered is not required to be upgraded to current code compliance. Incorrect answer. Please choose another answer.

5.	Which of the following plumbing fixtures requires a plumbing permit and inspection for the replacement of the fixture in the same exact location?
		a. Toilet
		b. Bidet
		c. Bathtub
		d. Water heater
Water heaters require that you apply for and receive a plumbing permit prior to the replacement of an existing water heater. After the replacement work is completed you must arrange for a plumbing inspection of the work by a code enforcement officer. All other plumbing fixtures can be replaced in their exact locations without the need for a permit or inspection. Due to the risk that can arise from a faulty installation of a water heater it is the rare fixture that does require a permit and inspection for a simple replacement. Incorrect answer. Please choose another answer.

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6.	The plumbing code applies to new installations. Which of the following types of plumbing work may also be governed by the code?
		a. Renovations
		b. Replacement of plumbing fixtures
		c. Additions to a plumbing system
		d. All of the above
All new installations are required to comply with the plumbing code. Other elements that may be required to meet current code requirements can include renovations, the replacement of fixtures, additions to a plumbing system and extensive repairs to plumbing systems. At no time can work done to a plumbing system make it unsafe or be detrimental to the system. Incorrect answer. Please choose another answer.

7.	A plumbing permit is required for the replacement of which of the following?
		a. Water closet
		b. Water heater
		c. Bathing unit
		d. All of the above
A plumbing permit is required for the direct replacement of any plumbing fixture in a plumbing system under the IPC and UPC. Incorrect answer. Please choose another answer.

General Regulations

8.	Many local code jurisdictions require a site plan before any work is done on an existing sewer or water service.
		a. True
		b. False
It is common for a code enforcement office to want a site plan and specifications on file prior to any work being done on an existing sewer or water service. The site plan should show the location of existing piping and the proposed location for new piping. Incorrect answer. Please choose another answer.

9.	Trusses must not be _______________.
		a. cut
		b. drilled
		c. notched
		d. All of the above
Trusses are engineered. Regardless of whether they are roof trusses or floor trusses, they must not be cut, notched, drilled, spliced or otherwise altered. When truss integrity is disturbed it can lose its structural ability. Normal cutting, notching and drilling procedures associated with solid wood joists and rafters do not apply to trusses. There are, however, some occasions when a truss must be altered to allow for a plumbing installation. When this is the case, an approved engineer must provide written details on how the truss can be altered to allow for a plumbing installation. Only an engineer can do this. Incorrect answer. Please choose another answer.

10.	Mechanical joints are prohibited from joining materials of different types.
		a. True
		b. False
Mechanical joints are approved for joining materials of dissimilar type as well as materials of the same type. Incorrect answer. Please choose another answer.

11.	Code interpretation is a critical element of success when working with the code requirements and regulations. Who does the code authorize to interpret the plumbing code?
		a. A master plumber
		b. An architect
		c. A licensed code enforcement officer
		d. Both a and c
Of the possible answers, only the licensed code officer is the one who is allowed to interpret the code. Whether a plumbing installation passes or fails an inspection is subject to a code officer's interpretation. You can appeal a decision that you feel is incorrect or questionable. Even as a master plumber your understanding of the intent of the code is not absolute. The plumbing inspector is the final word in the field when it comes to an interpretation of the code. Incorrect answer. Please choose another answer.

12.	What is the purpose of the plumbing code?
		a. To generate revenue for a jurisdiction through fees
		b. To control the plumbing work
		c. To protect the plumbing industry from unlicensed plumbers
		d. To have a legally enforceable document to safeguard property and public welfare
The main purpose of a plumbing code is to safeguard the health, safety, property and public welfare of a community. It becomes legally enforceable when it is adopted by a governing body with jurisdiction. Incorrect answer. Please choose another answer.

13.	When will a less stringent local plumbing code supersede state and federal codes?
		a. Never
		b. On minor plumbing work only
		c. On Installation instructions from the manufacturer
		d. Only on new construction work
The provisions of a local plumbing code will not be deemed to supersede state or federal law unless they exceed the requirements of the state or federal law, making the local requirement more stringent. This occurs only if the state or federal authority permits preemption. Incorrect answer. Please choose another answer.

14.	All pipe used in plumbing applications will have all of the following markings except:
		a. Pressure rating in psi
		b. Nominal pipe size
		c. Length of pipe
		d. Manufacturer's brand name
Some pipe manufacturers list measurement in one foot increments when rolls of pipe are 100' or over, but do not list increments on joints of 21', 20' or less. Brand names, psi rating, and nominal pipe size are required. Incorrect answer. Please choose another answer.

15.	Which of the following is suitable for testing a DWV system for leaks?
		a. Air
		b. Water
		c. Smoke
		d. All of the above
It is common for modern DWV systems to be tested with air. In the old days water was the most common means of testing. When there is a leak that cannot be found easily, smoke can be used to expose the leak location. Smoke is not used as a primary test method. Air is the test medium of choice. The testing of a DWV system is to be conducted for a minimum of 15 minutes. The minimum test pressure is required to be 10 pounds per square inch (PSI). If only underground plumbing is being tested there must be one riser that is at least ten feet above the main plumbing system. Incorrect answer. Please choose another answer.

Fixtures

16.	What is the maximum distance an employee of a department store should have to walk to reach a suitable restroom facility?
		a. 100 feet
		b. 250 feet
		c. 375 feet
		d. 500 feet
Employees must not have to walk more than 500 feet to reach suitable restroom facilities. During this walk they are not required to ascend more than one set of steps. Bathrooms under these conditions cannot be installed more than one story above the work area. There are possible exceptions for buildings that house factory workers or industrial workers. The 500 foot rule is the typical standard, but you should check your local code to confirm the local requirements. Incorrect answer. Please choose another answer.

17.	The accessible travel route for people going to use public plumbing facilities must not pass through a kitchen.
		a. True
		b. False
Accessible routes for travel to public restroom facilities are not allowed to pass through kitchens, storage rooms, closets or similar spaces. Incorrect answer. Please choose another answer.

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18.	What is the maximum distance that a lavatory faucet for accessible use can be placed from the front edge of a lavatory?
		a. 16 inches
		b. 18 inches
		c. 25 inches
		d. 28 inches
Lavatory faucets must be located no farther than 25 inches from the front edge of the lavatory being served by the faucet when the fixture is intended for handicap use. Incorrect answer. Please choose another answer.

19.	What is the likely height of a handicap toilet?
		a. 13 inches
		b. 15 inches
		c. 18 inches
		d. 22 inches
Handicap toilets are available with heights that include 16 inches, 18 inches and 20 inches. Eighteen inches is the most common height of a standard handicap toilet. Incorrect answer. Please choose another answer.

20.	What is the minimum unobstructed opening of egress when a shower door is installed for a typical shower?
		a. 22 inches
		b. 24 inches
		c. 28 inches
		d. 30 inches
The minimum unobstructed opening of egress for a shower door installed on a typical shower is 22 inches. Incorrect answer. Please choose another answer.

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21.	Assume that you have been contracted to add a new bathroom group to an existing plumbing system. This is a toilet, lavatory and bathtub that will be installed in a new addition to a home. You will need a permit for the installation. Your plan is to connect the main drain from the bathroom group to the building drain. This could create a problem. From the choices below, choose the most likely concern.
		a. The building drain may need replaced with a larger pipe.
		b. Requirements for accessible plumbing fixtures
		c. Minimum distance requirements between fixtures
		d. The fact that water fountains cannot be installed in a room that contains a toilet
Adding new plumbing fixtures can overload existing plumbing. You must compute the total fixture-unit ratings and the demand that it will put on existing plumbing piping. It is possible that an existing pipe might have to be removed and replaced with a larger pipe. Incorrect answer. Please choose another answer.

22.	What is the minimum number of plumbing fixtures that must be installed in a single-family residence?
		a. 3
		b. 4
		c. 5
		d. 6
The minimum number of plumbing fixture required for a single-family home is five. This includes a toilet, a lavatory, a bathing unit, a kitchen sink and a washing machine connection. Additional fixtures can be added, such as dishwashers and hose bibs. Incorrect answer. Please choose another answer.

23.	You are installing accessible plumbing fixtures. You had journeyman plumbers set the fixtures and you review the work prior to calling for a code enforcement inspection. Visually, something looks wrong to you. Your concern is that the faucets on the lavatories will be difficult to reach for disabled people. Using your tape measure, you check the distance from the front of the lavatory. What is the maximum distance that a lavatory faucet for accessible use can be placed from the front edge of a lavatory?
		a. 18 inches
		b. 22 inches
		c. 24 inches
		d. 25 inches
Twenty-five inches is the maximum distance allowed between the front edge of a lavatory and the faucet installed on it when the fixture is to be rated as an accessible fixture. Incorrect answer. Please choose another answer.

Indirect and Special Wastes

24.	Which of the following locations is not an acceptable location for an indirect waste receptor?
		a. Closets
		b. Unvented areas
		c. Both of the above
		d. None of the above
Indirect waste receptors are not to be installed in closets or unvented areas. All indirect waste receptors are required to be accessible. Incorrect answer. Please choose another answer.

25.	Clear water waste from a potable source, such as a relief valve on a water heater, must be piped to an indirect waste through an air gap.
		a. True
		b. False
Clear water waste from a potable water system is to be piped to an indirect waste and must discharge through an air gap. This is as simple as having the discharge pipe terminate six inches above the strainer of a floor drain. Incorrect answer. Please choose another answer.

26.	Discharge tubing connected to a relief valve does not require traps for which of the following?
		a. A water heaters
		b. A boiler
		c. An expansion tank that serves a boiler
		d. All of the above
The discharge tubing that is connected to a relief valve that is servicing a water heater, boiler or an expansion tank for a boiler is not allowed to be trapped. Discharge piping from the relief valve is to extend downward to a point within six inches of a floor. Ideally, the drainage tubing should terminate above a floor drain, but this is not a requirement. The end of the tubing is not to be threaded. Incorrect answer. Please choose another answer.

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27.	What is the maximum allowable water temperature that can be used with a commercial dishwashing machine?
		a. 115 degrees F.
		b. 120 degrees F.
		c. 140 degrees F.
		d. None of the above
Commercial dishwashing machines are allowed to use high-temperature hot water that would not be allowed for a residential use. It is common for these machines to use hot water that has a temperature in excess of 140 degrees F. 165 degrees F is what is needed to sanitize 99.9% of bacteria according to NSF 3. Due to the high temperature of hot water used with commercial equipment the discharge from the dishwasher must discharge through either an air gap or an air break. The discharge is to enter a standpipe made of approved materials for the high-temperature water. Incorrect answer. Please choose another answer.

28.	Which of the following is considered to be the best method for connecting an indirect waste to a sanitary drainage system?
		a. Air gap
		b. Air break
		c. Both a and b are equal
		d. None of the above
An air gap is believed to be superior to an air break for the protection of an indirect wastepipe from back siphonage. Due to the nature of installation there is more risk of a backflow occurring with an air break. Since air breaks have discharge piping entering a receptor it is feasible to have the sanitary drain become clogged and back up, which could result in contaminated waste traveling back to the indirect waste fixture. This is not possible when an air gap is used. Incorrect answer. Please choose another answer.

29.	The minimum vertical distance from the bottom of an indirect drain line to its receptor's flood rim is _____________________________.
		a. 1"
		b. ¾"
		c. ½"
		d. 2"
Minimum vertical distance from the bottom of an indirect drain line to its receptors flood rim is 1". Incorrect answer. Please choose another answer.

Vents and Venting

30.	Circuit vents may be _____________.
		a. Connected to stack vents
		b. Connected to vent stacks
		c. Connected to a main vent system that extends to outside air
		d. All of the above
Circuit vents are allowed to tie into stack vents, vent stacks and venting systems that extend to outside air. They may also extend to outside air independently. Incorrect answer. Please choose another answer.

31.	Which of the following types of fixtures can be served by a combination-waste-and-vent system?
		a. Urinals
		b. Toilets
		c. Sinks
		d. Bidets
Combination-waste-and vent (CWV) systems do not require independent vents on all fixtures. Instead of a vertical vent the fixtures approved for a CWV installation are installed with oversized drains. Due to the larger drain diameter the fixture obtains the needed air for drainage in the top section of the oversized piping. Urinals, toilets and bidets are not allowed to be installed on CWV systems. Incorrect answer. Please choose another answer.

32.	Circuit vents can do which of the following?
		a. Tie into stack vents
		b. Tie into vent stacks
		c. Tie into another vent that extends to outside air
		d. All of the above
Circuit vents are used when venting a battery of fixtures. The vents may be tied into other vents that extend to outside air. This includes vent stacks and stack vents. The diameter of a circuit vent must be at least one-half the size of the drain that it is serving. Incorrect answer. Please choose another answer.

33.	Sumps used to hold sewage or house sewage pumps are required to be ________.
		a. Vented
		b. Covered with a gas-tight cover
		c. Placed outside of any habitable structure
		d. Both a and b
Sumps for sewage pumps that remove sanitary waste are required to be vented to outside air. The vent cannot be tied into a general venting system if a pneumatic sewer ejector pump is to be installed. When a typical sewer pump is to be used the vent can tie back into a general venting system. Generally, the minimum diameter of a vent for a sewage sump will be required to be two inches in diameter. In addition to proper venting, sewage sumps must be equipped with gas-tight covers. Incorrect answer. Please choose another answer.

34.	When you are required to size a waste stack vent you will need to know ____________.
		a. The type of fixtures that will connect to the pipe
		b. The flow rate of the pipe
		c. The number of drainage fixture units that the pipe will be required to handle
		d. The developed length of the vent piping
Drainage fixture units are the primary key needed to size waste stack vents. Once you have this, you will have a chart to work with to convert your information into a minimum pipe diameter for the piping. You will need to determine the total discharge of fixture units into one branch interval. The total discharge into the pipe, measured in fixture units, is also needed. With this in hand and the proper sizing chart, you will be able to cross reference from the chart to determine the minimum diameter of the stack size. Incorrect answer. Please choose another answer.

35.	Which of the following types of fixtures can be served by a combination-waste-and-vent system?
		a. Urinals
		b. Toilets
		c. Sinks
		d. Bidets
Combination-waste-and vent (CWV) systems do not require independent vents on all fixtures. Instead of a vertical vent the fixtures approved for a CWV installation are installed with oversized drains. Due to the larger drain diameter the fixture obtains the needed air for drainage in the top section of the oversized piping. Urinals, toilets and bidets are not allowed to be installed on CWV systems. Incorrect answer. Please choose another answer.

36.	You are connecting two back to back lavatories, two urinals and two water closets to one horizontal branch. What are the maximum number fixtures that can be connected to a horizontal branch?
		a. 3
		b. 4
		c. 6
		d. 8
The plumbing code allows a maximum of eight fixtures connections to a horizontal branch drain. This is also called a circuit vent. Incorrect answer. Please choose another answer.

37.	Piping for building drains and horizontal drainage branches require the installation of cleanouts. Spacing for these cleanouts is determined by the diameter of the drain and other factors. In this scenario the drain pipe diameter is three inches. This drain has a running length of 40 feet. During this run the pipe takes one 90-degree turn and on one 45-degree turn. How many cleanouts are required for this installation?
		a. 2
		b. 3
		c. 4
		d. 6
Under the IPC, a cleanout is needed for every change of direction exceeding 45 degrees.Also, when there is more than one change of direction in a run of pipe, there needs to be a cleanout for every 40 feet of developed length.Using these standards, we need 1 cleanout for the 90 degree turn and 1 cleanout for the 40 feet of developed length. Under the UPC, a cleanout is needed for every 100 feet of developed length of pipe or a fraction thereof. Furthermore, a cleanout is needed for every aggregate change of direction that exceeds 135 degrees.Using these standards, we need 1 cleanout for the distance, 40 feet, which is a fraction of 100 feet, and 1 for the aggregate change in direction since it goes over 135 degrees. Incorrect answer. Please choose another answer.

Traps and Cleanouts

38.	If three 45-degree bends are used to make an offset, a cleanout is required at the top of the horizontal drain within 24 inches of where it connects with the last 45-degree bend.
		a. True
		b. False
Cleanouts are not required when a drain pipe makes a turn of no more than 45 degrees. The fact that three 45-degree fittings are used to make an offset is not reason to require the installation of a cleanout. Incorrect answer. Please choose another answer.

39.	When can a cleanout be used for the installation of a new fixture? In other words, what makes it acceptable to remove a cleanout plug, replace it with a male adapter and then extend piping from that point to a new fixture?
		a. Never
		b. When approved by the master plumber who has been issued a plumbing permit
		c. When another cleanout is provided
		d. When approved by a code enforcement officer and another cleanout is provided to replace the one being used as a connection point of drainage piping for a new fixture.
Fittings housing cleanout plugs are not allowed to be used as a connection point for a drainage pipe that will serve a new fixture, unless the connection is approved by a code officer and a new cleanout is provided to replace the cleanout being changed over to a connection point for drainage piping. Incorrect answer. Please choose another answer.

40.	Which of the following are acceptable types of cleanouts?
		a. The "U" bend of a P trap
		b. A rubber cap that is installed with a stainless steel clamp
		c. Neither a or b
		d. Both a and b
Several devices can be considered to be acceptable cleanouts. These devices include the following: "U" bends of P traps Water closets Rubber caps that are installed with stainless steel clamps Female adapters fitting with cleanout plugs Test tees are suitable cleanouts. Special cleanouts that allow the cleaning of a drain in both directions, upstream and downstream, are acceptable. Incorrect answer. Please choose another answer.

41.	What is the maximum distance that cleanouts can be installed from an access opening under a floor, such as in a crawl space?
		a. 4 feet
		b. 7 feet
		c. 20 feet
		d. 50 feet
There cannot be more than twenty feet between an access opening and a cleanout when the cleanout is installed below a finished floor. More than one access opening may have to be provided for access to cleanouts in large buildings. Incorrect answer. Please choose another answer.

42.	What is the minimum depth of a trap seal?
		a. 1 inch
		b. 1.25
		c. 1.5 inches
		d. 2 inches
The minimum depth of a liquid trap seal is two inches. This depth must be maintained. If the trap is not used often the trap seal may evaporate. If there is a risk of the trap drying out, a trap prime is to be installed. This is a device that detects a falling level of liquid in a trap and then introduces water into the trap if the trap seal is in risk of dropping below the required minimum. Incorrect answer. Please choose another answer.

43.	One trap arm may serve a total of how many P-traps?
		a. 3
		b. 1
		c. 2
		d. 4
Not more than one trap is permitted on a trap arm. Incorrect answer. Please choose another answer.

44.	Flexible water connections are required to be _________.
		a. Readily accessible
		b. Accessible
		c. Limited to first-floor installations
		d. Supported
All flexible water connections are required to be accessible. This means that they can be concealed in a cabinet or behind an access panel, but they must be accessible. Incorrect answer. Please choose another answer.

Water Supply and Distribution

45.	Which of the following is the proper term for piping that delivers potable water from a water source to a water-distribution system?
		a. Water main
		b. Water supply
		c. Either a or b
		d. None of the above
The primary piping that delivers potable water to a water-distribution system is called either a water main or a water supply. This is the case whether the water is coming from a water well or a municipal water system. The minimum diameter for a water supply pipe is .75 inch. Incorrect answer. Please choose another answer.

46.	A water service is required to be protected from which of the following?
		a. Tampering
		b. Vandalism
		c. Damage during or related to backfilling of the water service trench
		d. Geothermal shifting due to seismic action
A water service pipe must be protected from freezing by being buried below the local frost line. The pipe is also required to be protected from flooding to prevent floating. When backfilling a ditch that contains a water service the backfill must be clean and free of sharp objects to protect the piping from damage that may be caused under the weight of backfill material and settlement movement. Incorrect answer. Please choose another answer.

47.	Which of the following devices can be used to increase water pressure when the pressure from a water source is not adequate for the needs of a plumbing system?
		a. A pressure increasing valve
		b. A booster pump
		c. Either a or b
		d. None of the above
Booster pumps can be installed to increase water pressure as needed. These pumps are installed as a part of the water distribution system. These pumps are capable of reducing volume to increase pressure without negative effects on the performance of plumbing fixtures. Incorrect answer. Please choose another answer.

48.	What is the maximum allowable flow rate and consumption for a lavatory installed for public use with a pressure rating requirement of 60 PSI?
		a. 0.5 gpm
		b. 1 gpm
		c. 2.5 gpm
		d. 3 gpm
Public lavatories that are required to deliver waster at a pressure of 60 psi are required to have a maximum flow rate and consumption of 0.5 gpm. This does not seem like much water. Water conservation has long been a concern and newer fixtures are designed to operate properly while using less water. Incorrect answer. Please choose another answer.

49.	Water heaters, hose bibs and sill cocks are normally protected from backflow with ________.
		a. An air gap
		b. An air break
		c. A vacuum breaker
		d. A reduced-pressure backflow preventer
Vacuum breakers are normally used to protect water heaters, sill cocks and hose bibs from backflow dangers. Incorrect answer. Please choose another answer.

Sanitary Drainage Systems

50.	Asbestos-cement pipe can only be joined by a sleeve coupling of the same composition as the pipe and sealed with an elastomeric ring.
		a. True
		b. False
The only allowable connection between sections of asbestos-cement pipe is one that is made with a sleeve coupling of the same composition as the pipe and sealed with an elastomeric ring. Incorrect answer. Please choose another answer.

51.	Vents for vertical offsets are not required where the stack and its offset are _____ as a building drain.
		a. identified
		b. sized
		c. wet vented
		d. excluded
Vents for vertical offsets are not required where a stack and its offset is sized as a building drain. It is normal for vent pipes to have a diameter that is smaller than the drain that they serve. However, if the vent has the same diameter of the drain it is serving it is exempt from certain vent regulations. In this case, that means that vents with diameters equal to the drains being served are exempt from the venting of vertical offsets. Incorrect answer. Please choose another answer.

52.	Which of the following fittings are approved for changes in piping direction from horizontal to vertical?
		a. Quarter bend
		b. Short-sweep fittings
		c. 90-degree elbows
		d. All of the above
All of the listed fittings are allowed for changes in piping from a horizontal to vertical position. Additionally, any fitting allowed for changes in horizontal to horizontal direction are also approved for use when turning to a vertical position. Incorrect answer. Please choose another answer.

53.	What is the typical amount of grade required per liner foot on a household drainage pipe?
		a. 1/8 inch
		b. 1/4 inch
		c. 3/4 inch
		d. 1 inch
The amount of grade, also referred to as pitch or fall, for a drain pipe is determined by the size of the drain pipe. Master plumbers and other design professional establish these elements of a plumbing system based on the minimum standards required by local code requirements. As a general rule-of thumb, the proper amount of grade for a drain up to 4-inches in diameter is .25 inch per liner foot. Incorrect answer. Please choose another answer.

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54.	What will result when a 4 inch pipe is reduced in size in the direction of the flow?
		a. The waste will travel faster which will allow for better cleaning of the pipe.
		b. This could cause blockage to build up at the reduction point.
		c. This could cause slugging in the waste system.
		d. This will have no affect on the drainage system.
At the reduction point, because of the direction of flow, waste can build up which will result in ping system blockage. Incorrect answer. Please choose another answer.

Special Piping and Storage Systems

55.	Indirect waste receptors for sterilizers must be trapped and vented.
		a.True
		b. False
Indirect waste receptors for sterilizers are not required to be trapped or vented. However, some sterilizers do require vapor vents to comply with manufacturer recommendations. Incorrect answer. Please choose another answer.

56.	Ice makers and ice storage chests installed in healthcare facilities are required to be installed _______.
		a. adjacent to the kitchen area
		b. in locked rooms
		c. in a nurse station or other similarly supervised area
		d. in rooms that are clearly labeled as containing ice in the event that it is need for burn victims
Ice makers and ice storage chests installed in healthcare facilities are to be installed in nurse stations or other areas with similar supervision. The location of ice producing and storage equipment must be protected from contamination. All ice facilities must be safe and hygienic. Incorrect answer. Please choose another answer.

57.	Aspirators are required to discharge their waste through which of the following?
		a. Air gap
		b. Air break
		c. Either a or b
		d. Neither a or b
The plumbing code requires aspirators to discharge their waste through an air gap. A potable water supply for an aspirator is required to be equipped with a vacuum breaker or some other equivalent backflow protection. Incorrect answer. Please choose another answer.

58.	In Med Gas systems, the exhaust from vacuum pumps must be discharged into the following:
		a. Designated receptor
		b. Indirect drain
		c. Outdoors
		d. Relief vent
Exhaust must be discharged outdoors in a way which will minimize the hazard of noise and contamination to the environment. Incorrect answer. Please choose another answer.

59.	Flux can only be used in the brazing process when:
		a. Brazing copper to brass
		b. Brazing copper to copper
		c. Not allowed
		d. Both a and b
Flux may only be used to braze dissimilar metals. Incorrect answer. Please choose another answer.

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Water Heaters

60.	Let's assume that you are responsible for the installation of a water-heating supply system. What type of equipment are you going to install on it?
		a. Ball valves on both the inlet and outlet piping
		b. A ball valve on the inlet piping
		c. An automatic temperature control
		d. None of the above
Automatic temperature controls are required on all water heaters and water heating systems for domestic hot water. This control must be adjustable and allow for the temperature setting to be set to a minimum and a maximum level. Check local code requirements to determine the maximum allowable temperature for hot water being supplied for through domestic water distribution systems. Incorrect answer. Please choose another answer.

61.	Water heaters must be protected from back siphonage with the use of vacuum breakers.
		a. True
		b. False
Vacuum breakers are required to be installed on the water supply inlet piping of all water heaters. The normal procedure for this is the installation of a tee fitting in the inlet riser. The center outlet of the tee receives a short section of horizontal pipe that is then turned in a vertical position. Another section of piping, usually about six inches in length, is installed with a female adapter on the end of it. At this point the vacuum breaker can be screwed into the female adapter. Incorrect answer. Please choose another answer.

62.	The end of a discharge pipe connected to a relief valve is required to be threaded on the termination end.
		a. True
		b. False
It is against code requirements to use threaded pipe at the terminal end of a discharge pipe for a relief valve. The reason for this is simple. If threads are present, a cap could be installed. If this were to happen the pipe would be unable to discharge. Therefore, the ends of discharge tubing and piping must not be threaded. Incorrect answer. Please choose another answer.

63.	Where is the maximum allowable working pressure of a storage tank and water heater required to be shown?
		a. In the installation guide
		b. Stamped in the metal
		c. On a permanently attached plate
		d. Either b or c
Such markings shall be in an accessible position outside of the tank, permanently affixed. Incorrect answer. Please choose another answer.

64.	The minimum depth thickness for a water heater drip pan is __________________________.
		a. 1"
		b. 1.5"
		c. 3/4"
		d. 2"
1.5" is the minimum depth size for a drip pan. Incorrect answer. Please choose another answer.

Recycling Gray Water

65.	Collection reservoirs for gray-water must be made of approved materials. To comply with this, a gray-water collection reservoir is required to be ___________.
		a. absorbent
		b. corrosion proof
		c. nonabsorbent and durable
		d. Both b and c
Collection reservoirs are required to be durable, nonabsorbent and corrosion resistant--not corrosion proof. The reservoir must be closed with a gas-tight seal. An access opening is required that will allow for routine inspections to be performed. Incorrect answer. Please choose another answer.

66.	Which of the following must be installed on a gray-water distribution system?
		a. A backflow preventer
		b. A full-open valve
		c. A backwater valve
		d. None of the above
A full-open valve is required on the piping that is conveying gray water to a collection reservoir. The valve is to be installed on the downstream side of the last fixture connection to a gray-water discharge pipe. It is also required that the valve be installed prior to the discharge pipe entering a filter installed for a gray-water system that is bound for a collection reservoir. Incorrect answer. Please choose another answer.

67.	Gray water that enters a collection reservoir must be ________.
		a. Measured
		b. Flow controlled
		c. Filtered
		d. Monitored
Any gray water going into a gray-water collection reservoir is required to be filtered. This is required as a means of blocking solids from entering the collection reservoir. While the fixtures allowed for the recycling of gray water should not be transporting solids there is always a possibility the some type of solid could find its way into the drainage water. The filters stop these impurities from reaching the collection of gray water that will be recycled. Incorrect answer. Please choose another answer.

68.	What is the maximum amount of time that gray water is allowed to be retained for use to flush a toilet or urinal?
		a. 24 hours
		b. 48 hours
		c. 72 hours
		d. 96 hours
The maximum allowable time for the retention of gray water that will be used to flush toilets or urinals is 72 hours. Holding water for long periods of time can result in the growth of bacteria. This bacteria is not wanted in the plumbing system. For example, green water in a toilet tank is not appealing and could present health hazards. When a gray water recycling system is sized properly the water retained in a collection reservoir would be balanced to the fixtures served and the normal daily use of the fixtures will draw down from the reservoir often enough to avoid prolonged water storage. Incorrect answer. Please choose another answer.

Fuel Gas

69.	Which of the following mediums is not allowed for use in testing gas pipe installations?
		a. Air
		b. Oxygen
		c. Nitrogen
		d. Carbon dioxide
Oxygen is not allowed to be used when testing a gas piping system. Incorrect answer. Please choose another answer.

70.	When testing gas piping installed in a single-family home, that has a volume of less than 10 cubic feet, the minimum length of time that the system must be tested is _________________.
		a. 10 minutes
		b. 15 minutes
		c. 30 minutes
		d. 60 minutes
Gas piping that is installed in a single-family home and that has a volume of less than 10 cubic feet requires a test that is sustained for a minimum of 10 minutes. Testing is not allowed to be maintained for more than 24 hours. The most common testing device used is a manometer. Incorrect answer. Please choose another answer.

71.	Flexible gas connectors for all gas appliances, except cooking ranges and clothes dryers, are limited to a maximum length of _______ inches.
		a. 24
		b. 30
		c. 36
		d. 72
Flexible gas connectors are normally limited to a maximum length of 36 inches. When they are used for cooking ranges and clothes dryers they can be up to 72 inches in length. These devices allow a fixture to be moved for disconnection. All flex connections should be as short as is practical. This is due to them being more vulnerable to damage than hard piping. Incorrect answer. Please choose another answer.

72.	Gas piping installed in a laundry chute ____________.
		a. Must be secured at maximum intervals of 6 feet
		b. Must be protected from damage in the normal course of use of the chute
		c. Is required to be installed with only vertical pipe sections
		d. Is a code violation
Gas piping in not allowed to be installed in laundry chutes, dumbwaiters, air-circulating ducts or elevators. The chutes, shafts and ducts can transport gas to various locations in a building if a leak should occur. Therefore, it is inappropriate to install gas piping in a location that could distribute gas beyond the location of the leak. Incorrect answer. Please choose another answer.

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73.	When flow controls are installed on gas piping, they _____________.
		a. Must be accessible
		b. Must not contain sediment traps
		c. Must be equipped with a leak-limiting device
		d. Are used to keep operating pressure lower than the supply pressure
Flow controls on gas systems are installed to keep the operating pressure of the system lower than the supply pressure for the system. These devices prevent excessive pressure from the distribution system. They must be approved and suitable both the inlet and outlet gas pressure for the application. The flow controls must be readily accessible. Incorrect answer. Please choose another answer.

Math

74.	What is the angle made when you offset a sewer with a 1/8 bend?
		a. 45°
		b. 60°
		c. 72°
		d. 90°
Degree of Angle = Fitting x 360 Degrees Degree of Angle = 0.125 x 360 Degrees Degree of Angle = 45 degrees Incorrect answer. Please choose another answer.

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75.	What is the total pressure in pound per square inch (psi) on a 6 inch diameter test plug with a water head of 15 feet?
		a. 3.00 psi
		b. 4.25 psi
		c. 6.51 psi
		d. 7.20 psi
Pressure = Height x Amount of pressure exerted at base of a one foot stack P = 15 x .434 P = 6.51 psi Incorrect answer. Please choose another answer.

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Dodge Woodson

was a master plumber and gas fitter for over 30 years. He built his own plumbing business and has trained countless plumbers. In addition to being a field plumber and contractor, Woodson served as adjunct faculty at Central Maine Technical College where he taught both plumbing licensing preparation courses and plumbing apprenticeship courses. As R. Dodge Woodson, he is a best-selling author and is the most prolific plumbing author in print with McGraw-Hill. He is often referred to as America’s Plumber.

Charles Redecker

was a master plumber instructor and education director with the National Center for Construction Education and Research. Charles taught plumbing with the NCCER for over 10 years. Prior to working with the NCCER, Charles taught plumbing at the Rankin Technical College. Charles owned and run various plumbing businesses since 1979 in St. Louis, Missouri.

John Richardson

is a master plumber who has been in the plumbing business since 1977. He is a certified continuing education instructor for plumbing in Texas and teaches CPE classes to journeyman and master plumbers to renew their licenses. John holds a B.A. degree in English from Texas A&M University. He owns State-Wyed Plumbing and Septic in Katy, Texas.

Terry Lunt

is a plumbing and master craft instructor with Associated Builders and Contractors in Southern California. He has also been a core curriculum instructor and subject matter expert in plumbing with the National Center for Construction Education and Research. Terry has worked in the plumbing industry for over 30 years.

Joseph Cromwell

is a master plumber in Illinois and Indiana. He was a continuing education instructor and apprentice instructor for over twenty years with the United Association of Plumbers and Pipefitters.

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