Plumbing - Session 10 Part 2

A domestic hot water supply is to be installed in a 6-family, 3-story multiple dwelling. The building is 45 feet hight and the developed length of the hot water supply piping from the source of hot water to the extreme fixture is 63 feet. In keeping with the reference standards, under these conditions:

A. The circulation return should be required.

B. The circulation return should be required only on the piping that is in excess of 20 feet.

C. The circulation return should be required only for the basement piping.

D. No circulation return is required.

Potable water system disinfected as required by department of health. Where no methods is prescribed, the system shall be:

A. The pipe system shall be flushed with clean … .

B. The system or part thereof shall be filled with a … .

C. Containing at least … .

D. To stand … or … .

E. Containing at least: … .

F. To stand … .

Combination stop-and-waste valves or cock shall not be installed:

A. Any place in the water supply system.

B. Underground.

C. Without vacuum breaker and check valve.

D. Without an air gap.

Circulating hot water system piping:

A. Does not need to be installed as the water continues to stay hot.

B. Shall be installed in accordance with the N.Y.C. plumbing code.

C. Shall be installed in accordance with the N.Y.S. energy conservation code.

D. Shall be installed in accordance with the New York city mechanical code.

The number of threads per inch of 3/4" pipe as compared with the number of threads per inch of 1-1/4" pipe is that the:

A. 3/4 pipe has less threads per inch than 1-1/4" pipe.

B. 3/4 pipe have the same threads per inch.

C. 1-1/4 pipe has less threads per inch than 3/4" pipe.

D. 1-1/4 pipe has more threads per inch than 3/4" pipe.

In comparing the volume of water flowing through 1/2" I.D. tubing line and a 1" I.D. tubing line with the same pressure in each line, the volume through:

A. The 1/2" tubing and the 1" tubing will be the same.

B. !" tubing will be double the volume of the 1/2" tubing.

C. !" tubing will be three times the volume of the 1/2" tubing.

D. !" tubing will be four times the volume of the 1/2" tubing.

Pressure relief valve must be installed on hot water heaters. The reason for this is:

A. To drain water from the tank for repair.

B. That when pressure becomes excessive, the relief valve will open and reduce the pressure.

C. That water will be released when the tank is full.

D. To prevent air pockets from forming ft the bottom of the tank.

The New York city plumbing code requires that water service piping be buried at least 3'-6" below outside ground level. The reason for this is:

A. Prevent the water in the pipe from freezing during the winter season.

B. Permit gas service lines to be installed 2' below outside ground level.

C. Permit the use of larger diameter pipes.

D. Keep the water cool the year round.

A building drain which is buried underground may not be made of:

A. Extra heavy cast iron.

B. Ductile iron.

C. Galvanized steel.

D. Stainless steel.

Brass is an alloy of:

A. Lead and copper.

B. Lead and tin.

C. Tin and copper.

D. Zinc and copper.

The main reason for providing a trap for a plumbing fixture is to:

A. Permit cleaning a fixture when clogged.

B. Equalize the pressure in the system.

C. Prevent the passage of drainage pipe gases from entering the house.

D. Catch foreign objects such as jewelry, hair pins, etc.

The pipe which delivers potable water under pressure from a street main to a building is called the:

A. Service pipe.

B. Interceptor.

C. Distribution pipe.

D. Fixture pipe.

If a drain line pitches one foot in a length of 48 feet, the pitch of the line is most nearly:

A. 1/4" per ft.

B. 3/8" per ft.

C. 1/2" per ft.

D. 3/4" per ft.

The oakum for a caulked joint is packed into place by ramming it down with a:

A. Yarning iron.

B. jointer.

C. Caulking tool.

D. Cold chisel.

The main reason that a trap must be properly vented is to:

A. Vary the pressure in the waste line.

B. Provide an overflow for the fixture.

C. Drain the waste water when the trap is clogged.

D. Maintain the water seal in the trap.

The essential difference in making up vertical and horizontal caulked joints in cast iron pipe is that horizontal caulked joints require the use of:

A. less lead.

B. Less oakum.

C. A pouring rope.

D. A special caulking tool.

Galvanized pipe has a coating of:

A. Tin.

B. Zinc.

C. Lead.

D. Aluminum.

A fixture unit has a discharge rate of one cubic foot of water per minute. This discharge rate is expressed in gallons per minute and is equal to:

A. 4.5.

B. 5.

C. 7.5.

D. 9.5.

Sweating or condensation of moisture on the outside of the pipe is most likely to occur on:

A. Live steam pipe.

B. Compressed air pipe.

C. Hot water pipe.

D. Cold water pipe.

Extra strong pipe as compared to standard pipe of the same nominal size has:

A. The same outside diameter.but a smaller inside diameter.

B. A larger outside diameter and smaller inside diameter.

C. The same inside diameter but a larger outside diameter.

D. A larger inside and outside diameter.

You observe a plumber use a hammer to strike the hub and spigot ends of each piece of cast iron pipe before installing it in a soil line. This practice is:

A Poor because it may nick a,d weaken the pipe.

B. Poor because it may break the brittle cast iron.

C. Good because it loosens any rust which may have gathered.

D. Good because it enables the plumber to tell if the pipe is sound.

A plumbing sketch is drawn to scale of eighth-size. A line measuring 3" on the sketch would be equivalent to:

A. 2 feet.

B. 6 feet.

C. 12 feet.

D. 24 feet.

Plumbing riser diagrams are generally drawn to:

A. No scale.

B. 1/8"=1'-0" scale.

C. 1/4"=1'-0" scale.

D. 1/2"=1'-0" scale.

Of the following potable water supply systems, the one which is not considered to be an auxiliary potable water supply system is a:

A. Street main water supply system.

B. Elevated gravity water supply system.

C, Hydro-pneumatic pressure booster.

D. Water pressure booster pump system.

A pot and cover and/or manhole with cover is required for a building house trap when the distance from the centerline of the drain to the floor exceeds:

A. 12".

B. 16".

C. 18".

D. 24".

The minimum rinse water temperature that can be used in a commercial type dishwasher shall not exceed:

A. 140*F.

B. 160*F.

C. 180*F.

D. 200*F.

Assume that the flow rate of a grease interceptor is 50 g/p/m. Under this flow_through rating, the grease interceptor should have a minimum grease retention capacity of:

A. 6 pounds.

B. 30 pounds.

C. 60 pounds.

D. 100 pounds.

A deep seal trap has a minimum seal of:

A. 2".

B. 3".

C. 4".

D. 6".

A dual vent is commonly known as a:

A. Crown vent.

B. Common vent.

C. Side vent.

D. Yoke vent.

The discharge rate of an ejector pump is 50 GPM. The d/f/u/v for this pump is:

A. 10.

B. 40.

C. 75.

D. 100.

The drainage fixture unit load of an indirect waste receptor receiving the discharge of indirectly connected fixtures shall be the sum of the drainage fixture unit value of the fixtures that discharge to the receptor, but not less than the drainage fixture unit value given for the indirect waste receptor. The fixture unit value is 6 what is the minimum trap size required for this unknown receptor:

A. 3.

B. 4.

C. 5.

D. 6.

The flood level rim of a fixture is defined as:

A. The invert or bottom of the overflow.

B. The inside top of the overflow pipe.

C. 1" above the top of the overflow pipe.

D. The top edge or rim of the fixture.

Of the following installations, the one which does not conform to the plumbing code (i.e. illegal) is the installation of a:

A. Water closet with a 4":x3" closet bend.

B. Shower receptor with a 3" drain outlet.

C. Wash-down urinal with an integral strainer.

D. Ball cock in a flush tank 1" above the flood rim of the bowl and provided with a vacuum breaker.

Of the following statements. the one which best defines the plumbing term "cross-connection" is the connection between:

A. The domestic hot water and potable clod water.

B. Steam and a potable water supply.

C. Potable water at 40 psig. and a potable water at 90 psig.

D. Two different potable water distribution pipes.

Of the following types of W.C., the one which shall be used for public use is:

A. Elongated bowl.type.

B. Pan type.

C. Washout type.

D. Offset type.

The maximum interval between hangers for supporting horizontal 1-1/2" diameter steel pipe:

A. 6 ft.

B. 8 ft.

C. 10 ft.

D. 12 ft.

Which one of the following is an example of a possible cross connection:

A. Hose bibs.

B. Fire sprinkler connections.

C. Plumbing fixtures.

D. All of the above.

To determine absolute pressure in a water supply add local atmospheric pressure to what:

A. Gauge pressure.

B. Water supply pressure.

C. Pipe length.

D. Weight of water.

Additional forces related to the momentum from moving water are called:

A. Pressure reversals.

B. Hydrodynamics.

C. Hydrostatics.

D. Aerodynamics.

What is the pressure at a point in a water supply system that exists if the normal water supply is cut off:

A. Local pressure.

B. Gauge pressure.

C. Atmospheric pressure.

D. Back pressure.

Which of the following is not considered a cross-connection control:

A. Manually closed water supply valve.

B. Ordinary check valve.

C. Both A & B.

D. None of the above.

When a reduced-pressure principle back-flow preventer, pressure on the inlet side is intended to remain at least ... higher than the pressure in the reduced-pressure zone:

A. 1 psi.

B. 2 psi.

C. 3 psi.

D. 4 psi.

Which of the following is a shortfall of reduced-pressure principle back-flow preventers:

A. High initial cost.

B. Take up significant space.

C. Requires costly annual testing.

D. All of the above.

Direct connection of the steam exhaust, blowoff or drip pipe shall not be made with the building drainage system, waste water when discharge into the building drainage system shall be at a temperature not higher than:

A. 121*F.

B. 180*F.

C. 150*F.

D. 140*F.

Engineered sanitary drainage system:

A. Will be permitted.

B. Will not be permitted.

C. Does not exist.

D. Too costly to use.

The working area in eating surfaces and storage areas in food service establishments shall not have:

A. Exposed soil piping above it.

B. Exposed waste piping above it

C. Vent and water piping above it.

D. A & B.

Plastic pipe and fittings shall not be used in:

A. Residential buildings five stories or less in height.

B. Residential buildings three stories or less in height.

C. Exposed soil or waste piping above any working, storage or eating surface or other areas in service establishments.

D. A & B.

ABS plastic piping is called:

A. Polyvinyl chloride pipe.

B. Stainless steel chloride styrene pipe.

C. Acrylonitrile butadiene styrene pipe.

D. Polyolefin pipe.

PVC plastic pipe is called:

A. Acrylonitrile butadiene styrene pipe.

B. Stainless steel drainage pipe.

C. Polyolefin pipe.

D. Polyvinyl chloride pipe.

Underground building sanitary drainage and vent pipe shall conform to standards listen in Table 702.2. The material not approved:

A. Cast iron pipe.

B. Copper or copper alloy tubing (type L, K).

C. Stainless steel drainage systems (type 316L).

D. Polyvinyl chloride (PVC) plastic pipe (type DWV).

A chemical waste system shall be:

A. Part of the sanitary drainage system.

B. Part of the sanitary waste drainage system

C. Completely separated from the sanitary drainage system.

D. Part of the sanitary and waste drainage system.

Lead bends and traps shall not be less than:

A. 0.125 inches wall thickness, 1/8 inch.

B. 0.25 inches wall thickness, 1/4 inch.

C. 0.375 inches wall thickness, 3/8 inch.

D. 0.5 inches wall thickness, 1/2 inch.

Where separate systems of sanitary drainage and storm drainage are installed in the same property, the sanitary and storm building sewers or drains shall not be permitted to be laid:

A. In separate trenches.

B. Side by side in one trench.

C. Within 12 inches side by side on one trench.

D. Over the water supply piping.

Building house traps shall be installed on all building drains near the foundation wall of the structure, inside of the street line, and on the sewer side of all connection except the connection used to receive the discharge from a:

A. Sewer ejector.

B. Oil separator.

C. Leader or combined system.

D. A, B & C.

If a building house trap is placed outside the foundation wall or below a cellar floor, it shall be made accessible in a manhole with a cover, or by extension of the two hand-holes that shall be provided with clean-outs at the cellar floor or grade. Hand-hold extensions shall be above the centerline of the drain but not more than:

A. 6".

B. 12"

C. 18".

D. 24"

Building house traps connected to the building house drain shall be:

A. Smaller.

B. Larger.

C. Same size.

D. One diameter larger.

Diameter of suds relief vents in which the pressure zone occurs shall be not less than 2 inches in diameter but never smaller than:

A. 1/2 the diameter of the piping in which the pressure zone occurs.

B. 3/4 the diameter of the piping in which the pressure zone occurs.

C. full size diameter of the piping in which the pressure zone occurs.

D. 1-1/2 size of the diameter piping in which the pressure zone occurs

Horizontal drainage piping shall be installed in uniform alignment at uniform slopes, the minimum slope of a horizontal drainage pipe shall be in accordance with Table 704.1 as pipe sizes:

A. 2-1/2" or less, minimum slope 1/4" per foot.

B. 3" to 6", minimum slope 1/8" per foot.

C. 8" or larger, minimum slope 1/16" per foot.

D. A, B & C.

The size of drainage piping shall not be reduced in size in the direction of flow. A 4-inch x 3-inch water closet connection shall:

A. Not permitted.

B. Not be considered as a reduction in size.

C. Be permitted.

D. B & C.

Drainage piping for future fixtures shall terminate with an approved:

A. Nipple.

B. Cap.

C. Plug.

D. B & C.

Horizontal branches shall connect to the bases of stacks at a point located not less than:

A. 10 times the diameter of the drainage stack downstream from the stack.

B. 10 times the diameter of the drainage stack upstream from the stack.

C. 40 times the diameter of the drainage stack downstream from the stack.

D. 40 times the diameter of the drainage stack upstream from the stack.

In the installation or removal of any part of the drainage system, dead ends shall be:

A. Prohibited.

B. Not permitted when extended as clean-outs.

C. Permitted.

D. Approved fixture drainage piping shall be considered as dead ends.

Where sinks, laundry trays, laundry washing machines, bathtubs and similar fixtures in which detergents producing suds are normally used and discharged at an upper floor level into a soil or waste stack that also serves fixtures in other occupancy units at a lower floor level, the drainage and vent piping for such lower fixtures shall be arranged so as to avoid connection to suds pressure Zones in the sanitary drainage and vent systems. If connected to the sanitary systems, a ... vent relieving to a non-pressure zone shall be provided at each suds pressure zone where such connections are installed:

A. Pressure relief.

B. Suds relief.

C. Vent stack.

D. Yoke relief.

Joints on brass pipe and fittings may be:

A. Brazed.

B. Threaded.

C. Welded.

D. A, B & C.

Suds pressure zones shall be considered to exist in a soil or waste stack, a zone shall be considered to exist in the vertical portion within ... stack diameters of the base fitting:

A. 40

B. 30.

C. 20.

D. 10.

Suds pressure zones shall be considered to exist at the following locations in sanitary drainage and vent systems when the piping serves on ... or more floors that receive wastes that contain detergents producing suds:

A. 1.

B. 2.

C. 3.

D. 4.

Suds pressure zones shall be considered to exist in the horizontal drain at the base of a soil or waste stack within ... stack diameters of the base fitting:

A. 10.

B. 40.

C. 20.

D. 30.

Where a 60-degree (1.05 rad) or 90-degree (.57 rad) fitting is installed in the horizontal drain, a suds pressure zone shall be considered to exist in the horizontal portion within ... drain diameters upstream of and ... drain diameters downstream of the fitting:

A. 10, 40.

B. 40, 10.

C. 40, 40.

D. 10, 10.

Using acrylonitrile-butadiene-styrene systems (ABS) plastic and /or mechanical joints on drainage pipes shall be made with an elastomeric seal shall be installed only in ... systems unless otherwise approved:

A. Above ground.

B. Under ground.

C. Above ground vent.

D. None of above.

In soil or waste stack offset of 60 degree or 90 degrees, a suds pressure zone shall be considered to exist in the vertical portion of the stack within ... stack diameter of the base fitting for the upper section of the stack, the zone shall be considered to exist in the horizontal offset within ... stack diameters of such base fitting and within ... stack diameters of the top fitting for the lower section of the stack:

A. 40, 10, 40.

B. 10, 40, 40.

C. 40, 10, 10.

D. 40, 40, 10.

Joints between ABS plastic pipe or fittings using solvent cement, the joint surface shall be clean and free from:

A. Solvent cement.

B. Moister.

C. Dryness.

D. None of above.

Joints between ABS plastic pipe or fittings using solvent cement to sanitary drainage piping:

A. Shall be applied to all joint surfaces.

B. Shall be applied to the pipe side only.

C. Shall be applied to the pipe fitting inside only.

D. Can be applied to the pipe or the fitting only.

Joints between ABS plastic pipe or fittings. The solvent-cement joints shall be permitted:

A. Above ground only.

B. Below ground only.

C. Above or below ground.

D. Not permitted.

Joints between ABS plastic pipe and fittings may use threads conforming to ASME B1.20.1 using schedule ... or heavier pipe:

A. 30.

B. 40.

C. 80.

D. 160.

When threading plastic ABS the dies:

A. May be used as the sane for steel pipe.

B. May be permitted specifically designed for plastic pipe.

C. May be permitted specifically used for brass pipe.

D. Shall be made in the U.S.A.

The thread lubricant approved for ABS plastic pipe shall be:

A. Approved thread lubricant.

B. Tape.

C. Applied to male threads only.

D. A, B & C.

Joints between asbestos-cement pipe (Transite) pipe or fittings shall be made with:

A. Fitting made out of similar composition as the pipe.

B. Sleeve coupling of the same composition as the pipe.

C. Cement pipe.

D. Hot poured approved material.

Joints between asbestos-cement pipe shall be sealed with:

A. Elastomeric ring.

B. Cement.

C. Caulking.

D. Adapter rings.

Joints between brass pie and fittings shall be:

A. Soft soldered.

B. High temperature soldered.

C. Brazed.

D. Hard soldered.

Threaded joints on brass pipe shall have the pipe-joint compound or tape applied on the:

A. Mail thread only.

B. Female threads only.

C. Male or female threads only.

D. Male and female threads.

Caulked joints between cast iron pipe, for hub and spigot pipe shall be firmly packed with:

A. Paper and rope.

B. Oakum.

C. Hemp.

D. B & C.

Joints for hub and spigot pipe shall use molten lead poured in one operation to a depth of not less than:

A. 1".

B. 2".

C. 3".

D. 4".

After pouring the molten lead into the hub of cast iron the lead shall not recede more than ... below the rim of the hub and shall be caulked tightly:

A. 0.125 inch, 1/8",

B. 0.25 inch, 1/4",

C. 0.375 inch, 3/8",

D. 0.0625 inch, 1/16",

Joints for hub and spigot pipe shall use lead and be run in:

A. One pouring.

B. Caulked tight.

C. Acid proof cement.

D. A & B.

Paint varnish or other coating placed on the joints for hub and spigot pipe shall:

A Be permitted.

B. Not be permitted.

C. Not be permitted on the joining material until after the joint has been tested and approved.

D. B & C.

Joints between cast iron pipe or fitting shall be:

A. Caulked joints.

B. Compression gasket joints.

C. Threaded.

D. A & B.

Mechanical joint couplings are used for:

A. Hub-less pipe and fittings.

B. S.W.C.I. pipe and fittings.

C. X.H.C.I. pipe and fittings.

D. Cast iron pipe with bell and spigot joints.

Joints between concrete pipe and fittings shall be made with:

A. Leaded joints.

B. Elastomeric seal.

C. Threaded.

D. Mechanical.

Joints between copper tubing or copper-alloy tubing or fittings may be:

A. Brazed.

B. Mechanical.

C. Soldered.

D. A, B & C.

Glass-to-glass connections (borosilicate glass joints) shall be made with:

A. A bolted compression-type stainless steel (300 series coupling).

B. Contoured acid-resistant elastomeric compression ring.

C. A fluorocarbon polymer inner seal ring; or with caulked joints.

D. A, B & C.

Joints between lead pipe or fittings may be:

A. Burned.

B. Wiped.

C. A & B.

D. Threaded.

Joints between PVS plastic pipe or fittings shall be:

A. Mechanical using elastomeric seal below ground only.

B. Solvent cementing using a purple primer.

C. Solvent cement not purple in color.

D. A, B & C.

Joints between vitrified clay pipe or fittings shall be made with:

A. Hot poured compounds.

B. Cement or mortar.

C. Elastomeric seal.

D. Caulked.

If plumber A does a job in 6 days, and plumber B does the same job in 3 days, how long will it take the two of them, working together, to do the job?

A. 1 days.

B. 2 days.

C. 3 days.

D. 4 days.

Plumbers A and B working together do a job in 4 1/2 days. Plumber B, working alone, is able to do the job in 10 days. How long would it take A, working alone, to do the job?

A. 6 2/11 days.

B. 7 2/11 days.

C. 8 2/11 days.

D. 9 days.

If plumber A can do a job in 6 days which plumber B can do in 5 1/2 days, and plumber C can do it in 2 1/5 says, how long would the job take if plumber A, B and C were working together?

A. 1 13/53 days.

B. 2 13/53 days.

C. 3 days.

D. 2 days.

It is estimated that it will take 6 plumbers 20 says to install a drainage system. After 8 plumbers worked 5 days, 8 additional plumbers were sent to the job site. The total time for the installation of the drainage system is moist nearly:

A. 15 days.

B. 10 days.

C. 20 days.

D. 18 days.

A bill for $475 is to be discounted at 15%, 12% and 8%. The net price is most nearly:

A. $347.

B. $325.

C. $375.

D. $400.

A pot sink (48"x24"x12") takes an average of 2 minutes to empty. The minimum grease retention of the required grease interceptor is most nearly:

A. 40 lbs.

B. 8 lbs.

C. 45 ;bs.

D. 60 lbs.

A house pump has capacity of 350 GPM. The highest point from center line of pump discharge to highest fixture is 90 feet. There is the equivalent of 6 feet loss of head through pipe friction. The suction has a 30 ft.assist. The manufacturer states the pump is 83% efficient. Pump brake horsepower most nearly required is:

A. 7 hp.

B. 10 hp.

C. 5 hp.

D. 20 hp.