Nccer Plumbing Level 2 Answer Key Review Questions

Administrative Policies and Procedures

ane.	A plumbing permit is required for the replacement of which of the following?
		a. Water closet
		b. Water heater
		c. Bathing unit of measurement
		d. Faucet
A plumbing permit is non needed for the direct replacement of whatever plumbing fixture, except for a h2o heater. Notwithstanding, if a fixture location is inverse, a permit is required. In other words, you lot can remove a toilet and supercede it with a new 1 without the demand for a permit. Just, if you movement the closest flange in whatsoever way, a permit is required. This is true for all plumbing fixtures. Incorrect answer. Please choose another answer.

2.	The provisions for licensing are determined by which of the following:
		a. Land Board of Plumbing
		b. Say-so having jurisdiction
		c. Plumbing inspector
		d. The responsible primary plumber
The authority having jurisdiction determines the provisions for licensing. State Plumbing Boards make up one's mind requirements and provide testing of qualified applicants to become licensed. Plumbing inspectors enforce codes adopted by the AHJ. Incorrect reply. Please cull some other answer.

Full general Regulations

3.	Which of the following is suitable for testing a DWV arrangement for leaks?
		a. Air
		b. H2o
		c. Smoke
		d. All of the above
Information technology is common for modern DWV systems to be tested with air. In the sometime days water was the virtually mutual ways of testing. When there is a leak that cannot be institute easily, smoke can exist used to betrayal 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 xv minutes. The minimum test force per unit area is required to be 10 pounds per square inch (PSI). If only clandestine plumbing is being tested there must exist 1 riser that is at least ten feet above the chief plumbing arrangement. Incorrect answer. Please choose another reply.

iv.	All piping used in plumbing applications will have all of the following markings except:
		a. Force per unit area rating in psi
		b. Nominal pipe size
		c. Length of pipe
		d. Manufacturer'south brand name
Some pipe manufacturers list measurement in ane foot increments when rolls of pipage are 100' or over, only practice not list increments on joints of 21', 20' or less. Brand names, psi rating, and nominal pipage size are required. Incorrect answer. Please choose some other respond.

Fixtures

5.	What is the likely height of a handicap toilet?
		a. 13 inches
		b. 15 inches
		c. 18 inches
		d. 22 inches
Handicap toilets are bachelor with heights that include xvi inches, 18 inches and xx inches. Eighteen inches is the most common height of a standard handicap toilet. Incorrect answer. Please cull some other answer.

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six.	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 respond. Please choose another answer.

Indirect and Special Wastes

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

8.	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 altitude from the bottom of an indirect drain line to its receptors flood rim is one". Wrong respond. Please choose another answer.

Vents and Venting

9.	Which of the following types of fixtures tin be served by a combination-waste-and-vent organisation?
		a. Urinals
		b. Toilets
		c. Sinks
		d. Bidets
Combination-waste product-and vent (CWV) systems do not crave contained 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 bore the fixture obtains the needed air for drainage in the top section of the oversized piping. Urinals, toilets and bidets are not immune to exist installed on CWV systems. Incorrect answer. Please choose some other answer.

ten.	Y'all are connecting two dorsum to dorsum lavatories, two urinals and two water closets to 1 horizontal branch. What are the maximum number fixtures that can be connected to a horizontal co-operative?
		a. 3
		b. 4
		c. 6
		d. viii
The plumbing code allows a maximum of eight fixtures connections to a horizontal branch drain. This is also chosen a excursion vent. Incorrect answer. Please choose some other answer.

11.	Piping for building drains and horizontal drainage branches crave 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 bore is three inches. This bleed has a running length of 77 anxiety. During this run the pipage takes one xc-caste plough. How many cleanouts are required for this installation?
		a. 2
		b. 3
		c. 4
		d. 6
Bleed pipes with diameters of four inches, or less, are required to have cleanouts installed at a maximum altitude of fifty feet apart. In our example this requires two cleanouts for this rule. A cleanout is besides required when the pipe changes management with an angle greater than 45 degrees. Since this piping installation has a 90-degree curve another cleanout is required. Therefore, a total of three cleanouts are required. Incorrect reply. Please choose some other respond.

Traps and Cleanouts

12.	Ane trap arm may serve a total of how many P-traps?
		a. three
		b. i
		c. ii
		d. 4
Non more than one trap is permitted on a trap arm. Incorrect answer. Delight choose another answer.

13.	Flexible water connections are required to exist _________.
		a. Readily accessible
		b. Attainable
		c. Limited to first-floor installations
		d. Supported
All flexible water connections are required to exist accessible. This ways that they can exist curtained in a cabinet or behind an admission panel, just they must be accessible. Incorrect respond. Please choose some other answer.

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Water Supply and Distribution

14.	H2o 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. Wrong reply. Please choose another reply.

Sanitary Drainage Systems

15.	What is the typical amount of class required per liner foot on a household drainage pipage?
		a. 1/8 inch
		b. 1/4 inch
		c. iii/4 inch
		d. 1 inch
The amount of grade, too referred to equally pitch or fall, for a drain piping is determined past the size of the bleed pipe. Master plumbers and other pattern professional establish these elements of a plumbing system based on the minimum standards required by local code requirements. As a full general rule-of thumb, the proper corporeality of grade for a drain up to 4-inches in bore is .25 inch per liner foot. Incorrect answer. Please choose another reply.

sixteen.	What will outcome when a four inch pipage is reduced in size in the management of the period?
		a. The waste will travel faster which will allow for amend cleaning of the pipe.
		b. This could crusade blockage to build up at the reduction signal.
		c. This could crusade slugging in the waste matter organisation.
		d. This will accept no affect on the drainage system.
At the reduction point, because of the direction of catamenia, waste material tin build up which will result in ping system blockage. Incorrect answer. Please cull another reply.

Special Piping and Storage Systems

17.	In Med Gas systems, the exhaust from vacuum pumps must be discharged into the post-obit:
		a. Designated receptor
		b. Indirect drain
		c. Outdoors
		d. Relief vent
Exhaust must be discharged outdoors in a manner which will minimize the hazard of noise and contagion to the surroundings. Incorrect answer. Please choose another answer.

18.	Flux can only exist 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 exist used to braze different metals. Incorrect answer. Delight choose another respond.

Water Heaters

19.	Where is the maximum commanded working force per unit area 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 reply. Please choose another respond.

20.	The minimum depth thickness for a h2o heater baste pan is __________________________.
		a. one"
		b. i.5"
		c. 3/four"
		d. 2"
1.v" is the minimum depth size for a drip pan. Incorrect answer. Please choose another answer.

Recycling Gray Water

21.	Gray water that enters a collection reservoir must be ________.
		a. Measured
		b. Flow controlled
		c. Filtered
		d. Monitored
Any gray h2o going into a grey-h2o drove reservoir is required to be filtered. This is required every bit a ways of blocking solids from entering the drove reservoir. While the fixtures allowed for the recycling of gray water should not be transporting solids in that location is e'er 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 greyness water that will exist recycled. Incorrect reply. Delight choose another answer.

22.	What is the maximum corporeality of time that gray water is allowed to be retained for use to affluent a toilet or urinal?
		a. 24 hours
		b. 48 hours
		c. 72 hours
		d. 96 hours
The maximum allowable time for the retentiveness of gray water that will be used to affluent toilets or urinals is 72 hours. Belongings h2o for long periods of time tin 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 highly-seasoned and could present health hazards. When a grayness water recycling system is sized properly the water retained in a collection reservoir would exist balanced to the fixtures served and the normal daily use of the fixtures will describe down from the reservoir oftentimes enough to avoid prolonged water storage. Wrong reply. Please choose another answer.

Fuel Gas

23.	Gas pipe installed in a laundry chute ____________.
		a. Must be secured at maximum intervals of six feet
		b. Must be protected from harm in the normal course of apply of the chute
		c. Is required to be installed with only vertical pipage sections
		d. Is a code violation
Gas piping in non 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. Wrong answer. Please cull another answer.

24.	When menses 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 level
Flow controls on gas systems are installed to continue the operating pressure level of the system lower than the supply pressure for the system. These devices prevent excessive pressure level from the distribution organisation. 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

25.	What is the angle made when you lot showtime a sewer with a 1/8 bend?
		a. 45°
		b. threescore°
		c. 72°
		d. 90°
Degree of Bending = Plumbing equipment x 360 Degrees Caste of Angle = 0.125 x 360 Degrees Degree of Angle = 45 degrees Wrong answer. Please cull another answer.

26.	What is the total pressure in pound per square inch (psi) on a half-dozen inch diameter examination plug with a water caput of 15 feet?
		a. 3.00 psi
		b. four.25 psi
		c. 6.51 psi
		d. 7.20 psi
Pressure = Pinnacle x Amount of pressure exerted at base of a one pes stack P = 15 x .434 P = 6.51 psi Incorrect answer. Please choose another answer.

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