Nevada C-1 Plumbing and Heating Contractor Examination

A steam heating boiler is being placed in service. Which safety control is required to shut off the fuel if the water level in the boiler drops below a safe point?

• AA high-limit aquastat only
• BA listed low-water fuel cutoff
• CA circulating-pump flow switch only
• DA flue-gas carbon-monoxide sensor

The pressure relief valve on a hot-water heating boiler must be which of the following?

• AA hose-bibb vacuum breaker piped to a floor sink
• BAn ASME-rated relief valve set at or below the boiler’s maximum allowable working pressure
• CA temperature-only relief valve set at 140°F
• DA check valve in the boiler feed line

On a steam heating boiler, a Hartford loop is installed in the return piping primarily to do which of the following?

• AIncrease the boiler’s steaming rate by raising the water line
• BPrevent the boiler water from being siphoned out through the return if a return line fails
• CReplace the need for a low-water fuel cutoff
• DConvert the steam boiler to a closed hot-water heating system

Per UPC 2018 Section 1211.8 and NFPA 54 (2012), where a sediment trap is required at a gas appliance, it shall be installed in which location?

• AUpstream of the appliance shutoff valve, as far from the appliance as possible
• BDownstream of the appliance shutoff valve and as close to the appliance inlet as practical
• CIn the meter manifold only, with no trap at the appliance
• DIn the vent connector above the draft hood

Per UPC 2018 Section 1211.5 and NFPA 54 (2012), an appliance manual gas shutoff valve shall be located not more than how far from the appliance it serves?

• A3 feet
• B6 feet
• C10 feet
• D25 feet

Per UPC 2018 fuel-gas testing rules, a low-pressure (not more than 14 inches water column) welded-free gas piping system shall be tested at not less than which pressure and duration?

• A3 psi held for 5 minutes
• B10 psi held for not less than 15 minutes with no perceptible drop
• C50 psi held for 60 minutes
• DWorking pressure only, with no timed hold

Per UPC 2018 Section 1211.8, which gas appliance is not required to have a sediment trap if one is not built into the appliance?

• AA gas furnace
• BA gas water heater
• CA domestic gas range
• DA gas boiler

Per UPC 2018 Section 1210.1.1 / NFPA 54 (2012), underground fuel-gas piping shall have a cover of not less than which depth, unless the pipe is in conduit or bridged where that cover cannot be provided?

• A6 inches
• B12 inches
• C36 inches
• D48 inches

When sizing a low-pressure natural-gas piping system by the UPC / NFPA 54 longest-length method, which length is entered in the sizing table for every pipe section?

• AThe length of that individual section only, ignoring fittings
• BThe developed length from the meter or regulator to the most remote appliance outlet
• CThe sum of all branch lengths in the building
• DOne-half the measured length to allow for diversity

Per NFPA 58 (2014) two-stage LP-gas regulation for a building, where is the first-stage regulator normally installed and what does it do?

• AAt each appliance, reducing 11 inches water column to 3.5 inches water column
• BAt the container, reducing tank pressure to an intermediate pressure (commonly about 10 p…
• CAt the meter bar, converting natural gas to propane pressure
• DIn the vent connector, controlling draft, not gas pressure

Per UPC 2018 Section 707.4, each run of horizontal drainage piping more than 100 feet in total developed length shall be provided with a cleanout at which interval?

• AEvery 50 feet or fraction thereof
• BEvery 100 feet or fraction thereof
• CEvery 200 feet, with no fraction rule
• DOnly at the building drain and sewer junction

Per UPC 2018 Section 707.4, an additional cleanout is required in a drainage line for each aggregate horizontal change of direction exceeding which angle?

• A45 degrees
• B90 degrees
• C135 degrees
• D180 degrees

Per UPC 2018 Section 707.9, what is the minimum clearance in front of a cleanout on piping 2 inches or less in size, and on piping larger than 2 inches?

• A6 inches for 2-inch and smaller; 12 inches for larger
• B12 inches for 2-inch and smaller; 18 inches for larger than 2 inches
• C18 inches by 18 inches for all sizes
• D24 inches by 24 inches for all sizes

Per UPC 2018 Section 402.5, the center of a water closet shall be not closer than which distance to a side wall, and the clear space in front shall be not less than which distance?

• A12 inches to the side wall and 18 inches in front
• B15 inches to the side wall or obstruction and 24 inches in front
• C18 inches to the side wall and 21 inches in front
• D24 inches to the side wall and 30 inches in front

Per UPC 2018 Section 408.6, a shower compartment shall have a minimum finished interior area of which size and shall be capable of encompassing a circle of which diameter?

• A900 square inches and a 24-inch circle
• B1024 square inches and a 30-inch circle
• C1200 square inches and a 36-inch circle
• D1440 square inches and a 42-inch circle

Per UPC 2018 Section 807.3, the waste from a domestic dishwasher shall first connect to which of the following before it enters the drainage system?

• AAn approved air-gap fitting
• BA reduced-pressure principle backflow assembly on the drain
• CA 4-inch floor drain without a trap
• DThe water-closet flush connection

Per UMC 2018 Chapter 12, a closed hydronic hot-water heating system shall be provided with which device to accept the volume change of the heated fluid?

• AA steam Hartford loop
• BAn expansion tank sized and installed for the system volume and temperature range
• CA reduced-pressure principle backflow assembly on every terminal unit
• DA Type B gas vent

Per UMC 2018 hydronic-piping rules, isolation (shutoff) valves shall be provided so that which of the following can be serviced without draining the entire system?

• AOnly the expansion tank, with no valves at heat exchangers or terminal units
• BHeat exchangers, equipment, and appliances on the hydronic loop
• CThe building sanitary sewer only
• DThe Type B vent connector only

Makeup water connected to a hydronic heating or chilled-water system shall be protected from contaminating the potable supply by which means?

• AA hose without a backflow preventer
• BAn approved backflow prevention device or air gap on the makeup connection
• CA steam Hartford loop
• DA Type B vent cap

Per UPC 2018 Section 608.5, the discharge pipe from a water-heater temperature-and-pressure relief valve shall comply with which requirement?

• AIt may be reduced one pipe size and may include a shutoff valve for service
• BIt shall be not smaller than the valve outlet, drain by gravity, and have no valve or oth…
• CIt shall be pumped uphill to the roof overflow drain
• DIt shall terminate into the water-heater flue

Per UPC 2018 Section 507.13 / NFPA 54 (2012), a gas-fired water heater in a residential garage, unless listed as flammable-vapor-ignition resistant, shall have its burners and ignition devices located not less than how far above the floor?

• A6 inches
• B12 inches
• C18 inches
• D36 inches

A storage water heater serving a dwelling has a closed potable system created by a pressure-reducing valve on the water service. Per UPC 2018 Section 608.2 / 608.3, what additional device is required on the cold-water piping?

• AA steam Hartford loop
• BAn approved expansion tank installed downstream of the regulator, or an approved pressure…
• CA hose-bibb vacuum breaker on the T&P discharge
• DA Type B vent increaser

A Category I natural-draft gas water heater is being replaced with a Category IV condensing water heater. Which venting change is required?

• AReuse the existing Type B double-wall vent and draft hood without change
• BInstall a listed vent system of the material, size, slope, and termination required by th…
• CDischarge the new appliance into a masonry chimney with no liner and no condensate drain
• DOmit all venting because condensing appliances do not produce flue gas

Per UPC 2018 / NFPA 54, a Type B gas vent serving a Category I draft-hood water heater shall terminate not less than which vertical height above the highest connected draft hood, and shall have a listed cap?

• A2 feet above the draft hood, with no cap required
• B5 feet of vertical height above the highest connected draft hood or flue collar, with a l…
• C25 feet above the roof, regardless of the appliance location
• DFlush with the roof jack and open, with no cap

Per UPC 2018 Section 606.2, a fullway valve shall be installed on the water-supply piping in which location relative to the water meter?

• AOnly at each hose bibb, with no building shutoff
• BOn the discharge side of the water meter so the building can be shut off
• COnly inside the water-heater flue
• DOnly on the building sewer

Per UPC 2018 Section 408.3 / 409.4, the shower and tub/shower mixing valve shall be a pressure-balancing, thermostatic, or combination valve limited to a maximum setting of which temperature?

• A100°F
• B120°F
• C140°F
• D180°F

Per UPC 2018 Section 609.10, water-distribution piping to a quick-closing valve shall be provided with which device, installed to the manufacturer’s instructions?

• AA steam Hartford loop
• BA water-hammer arrester
• CA Type B vent cap
• DA grease interceptor

Under the Nevada C-1 sheet-metal scope, fabricated metal gutters, leaders, and downspouts that convey rainwater are sized and installed as part of which system?

• AThe sanitary building sewer only
• BThe storm-drainage conductor and leader system
• CThe potable water-distribution system
• DThe natural-gas venting system

A Type B gas vent is constructed as which of the following?

• ASingle-wall galvanized pipe listed for Category IV condensing appliances
• BA listed double-wall gas vent for Category I non-condensing appliances
• CSchedule 40 PVC used as a chimney liner for an oil burner
• DFlexible dryer exhaust duct used as a furnace vent

Combustion-air ducts serving a gas-fired appliance in a confined space shall be which of the following?

• AFlexible dryer duct, crushed to fit the stud bay
• BOf galvanized steel or equivalent corrosion-resistant material, sized and terminated per…
• CConnected to the sanitary vent stack to share makeup air
• DOmitted if the appliance has a draft hood

Per UPC 2018 Section 608.2, where static water pressure in the water-supply piping exceeds which value shall an approved pressure regulator be installed and the static pressure reduced to that value or less?

• A40 psi
• B60 psi
• C80 psi
• D150 psi

Per UPC 2018 Section 610.8, the building water-supply pipe shall be not smaller than which size?

• A1/2 inch
• B3/4 inch
• C1-1/4 inches
• D2 inches

Per UPC 2018 Table 610.3, what water-supply fixture-unit (WSFU) value is assigned to the first hose bibb when sizing total building demand, and what value is assigned to each additional hose bibb?

• A1.0 for the first and 1.0 for each additional
• B2.5 for the first and 1.0 for each additional
• C4.0 for the first and 4.0 for each additional
• D5.0 for the first and 2.5 for each additional

Per UPC 2018 Section 609.4, a metallic potable-water piping system shall be tested at not less than which condition?

• A5 psi air for 5 minutes
• BWorking water pressure, or 50 psi air, held for not less than 15 minutes
• C10-foot head of water only, with no timed hold
• DVacuum only, with no positive pressure

Using UPC 2018 Table 610.3 private-use values, what is the total water-supply fixture-unit load of one 1.6 gpf gravity-tank water closet (2.5), one lavatory (1.0), one bathtub (4.0), and one domestic kitchen sink (1.5)?

• A6.0 WSFU
• B9.0 WSFU
• C12.0 WSFU
• D16.0 WSFU

Per UPC 2018 Sections 609.2 and 720.1, a water-service pipe may be placed in the same trench as the building sewer only when which condition is met?

• AThe water pipe is laid on the trench bottom beside any sewer material, with no separation
• BThe sewer is of approved material and the water pipe is placed on a solid shelf at one si…
• CThe water pipe is used as a tracer wire for the sewer
• DThe water pipe is smaller than 1/2 inch

A building water system has 100 psi street pressure. A pressure regulator will be set at 80 psi. When sizing the piping downstream of that regulator with UPC Table 610.4, which pressure should be used?

• A100 psi, because that is the street pressure
• B80 percent of the 80 psi set pressure, or 64 psi, to account for regulator fall-off
• C40 psi, regardless of the regulator setting
• D150 psi, the T&P-valve rating

Per UPC 2018 Table 313.3, horizontal ABS or PVC DWV pipe shall be supported at intervals not exceeding which spacing?

• A2 feet
• B4 feet
• C10 feet
• D15 feet

Per UPC 2018 Table 313.3, horizontal copper tube 1-1/2 inches and smaller shall be supported at least every 6 feet. Horizontal copper tube 2 inches and larger shall be supported at least every how many feet?

• A4 feet
• B6 feet
• C10 feet
• D20 feet

Per UPC 2018 Table 313.3, horizontal PEX tubing 1 inch and smaller shall be supported at intervals not exceeding which spacing?

• A16 inches
• B32 inches
• C6 feet
• D10 feet

Per UPC 2018 Table 313.3, horizontal hubless cast-iron soil pipe with shielded couplings shall be supported at which interval?

• AAt every other joint, unless the pipe length exceeds 4 feet, in which case support each j…
• BEvery 12 feet, with the hanger set on the coupling
• COnly at the base of the stack, with no horizontal hangers
• DContinuously, like lead pipe

Per UPC 2018 Section 712.2, when a drainage and vent system is water-tested in sections, each section shall be filled to not less than which head and held for which time?

• A5-foot head for 5 minutes
• B10-foot head above the highest fitting in that section, held 15 minutes
• C20-foot head for 60 minutes
• DWorking water-supply pressure for 15 minutes

Per UPC 2018 Section 906.1, each vent pipe or stack shall extend through its flashing and terminate vertically not less than how far above the roof?

• A1 inch
• B6 inches
• C3 feet
• D7 feet in all cases, including unused roofs

Per UPC 2018 Section 706.2, a sanitary tee may be used to change direction from which orientation to which orientation?

• AHorizontal to horizontal
• BVertical to horizontal
• CHorizontal to vertical
• DAny direction, including a flat on-its-back installation on a horizontal drain

Per UPC 2018 Section 708.1, horizontal drainage piping shall be installed at a uniform slope of not less than which grade, unless the AHJ approves a flatter slope on 4-inch and larger pipe?

• A1/16 inch per foot for all sizes
• B1/4 inch per foot (2 percent) toward the point of disposal
• C1 inch per foot
• DNo slope is required if the pipe is 3 inches or larger

Per UPC 2018 Table 703.2, Note 4, a 3-inch horizontal drainage branch or drain shall not exceed how many water closets?

• A1 water closet
• B3 water closets
• C6 water closets
• DUnlimited water closets if the DFU total is 35 or less