Plumbing - Session 8 Part 1

A trap borer should be used by a plumber when:

A. Cutting internal threads.

B. Preparing copper joints for sweating.

C. Joining cast iron to screw pipe for a solder nipple.

D. Preparing lead pipe for a solder nipple.

Hydrostatic test should be done by using:

A. Water.

B. Smoke.

C. Air.

D. Kerosene.

The center to-center measurement of 1 on figure 9 is most nearly equal to:

A. 20 inches.

B. 25 inches.

C. 30 inches.

D. 65 inches.

The center to-center measurement of 2 on figure 9 is most nearly equal to:

A. 20 inches.

B. 25 inches.

C. 30 inches.

D. 45 inches.

The center to-center measurement of 3 on figure 9 is most nearly equal to:

A. 30-1/2 inches.

B. 28-7/8 inches.

C. 28-3/4 inches.

D. 27-3/4 inches.

The center to-center measurement of 4 on figure 9 is most nearly equal to:

A. 23-1/2 inches.

B. 28-1/4 inches.

C. 29 inches.

D. 31-1/4 inches.

An offset is made in a hot water riser that eventually fills with air. As a result, which one of the following is most likely to occur:

A. Water hammer.

B. Decrease flow.

C. Increase flow.

D. Noise during flow.

If a set of sanitary plans are drawn to scale of 1-1/2inches equal to one foot, the plans are said to be:

A. One sixteenth size.

B. One eighth size.

C. One quarter size.

D. One tenth size.

When the first of the falling water has acquired a velocity greater than that of the water following it, the development that may be expected is:

A. Back pressure.

B. Siphonage.

C. Water-hammer.

D. Surging.

The pump generally selected to discharge the contents of a sewage ejector pot is:

A. Reciprocating pump.

B. Centrifugal pump.

C. Rotary pump.

D. Ejector pump.

Six water closets are connected in a battery without individual vents. A pipe that is connected to the soil stack and the branch soil pipe between the 5th and sixth water closets is defined as:

A. Loop vent.

B. Relief vent.

C. Circuit.

D. Yoke vent.

A type of fitting best suited as a foot-piece (connecting a stack to a building drain) is:

A. Two 45* ells and a 10 inch nipple.

B. A long sweep 90* ell with a test tee.

C. Wye and 1/8 bend.

D. Two 45 ells and a 6-inch nipple.

A six inch fresh-air-inlet plate has forty-eight 3/4-inch diameter holes drilled into the plate. The number of 1/2-inch diameter holes needed to meet the minimum requirements is most nearly:

A. 50.

B. 45.

C. 40.

D. 35.

In making a vertical caulked (no offset) joint on cast iron soil pipe, the tools and material required are usually:

A. Oakum, solder, hammer and inside and outside irons.

B. Oakum, swab, scraper, trowel and cement.

C. Oakum, lead, pouring rope, hammer and inside and outside irons.

D. Oakum, lead, hammer and outside irons.

Building (house) traps when below a cellar floor shall be made accessibly by extension of two hand holes. The maximum length hand holes may extend above the center line of the drain is;

A. 2 ft.

B. 4 ft.

C. 3 ft.

D. 1-1/2ft.

A basin d to be installed in the center of the room. The individual vent first rises above the flood level rim of the fixture, drops down through the floor, crosses to a partition wall, rises therein and finally ties into a vent stack three feet above the floor immediately above. At the low point of this branch vent the plumbing contractor must:

A. Set a drain cock of the plug type.

B. Provide a gravity drip connection to the soil or waste pipe.

C. Provide an approved air eliminator.

D. Provide a high level float trap to rid this branch vent of any condensate.

A privy vault is equivalent to a:

A. Water closet.

B. Building house sewer.

C. Private house sewer.

D. Building house drain.

Upon installation it is found that a drain line is much larger than need be for the connected fixture load. The probable result, in operation, of this condition would be:

A. increase the efficiency of this drain.

B. Increase the overall scouring action in this drain.

C. Decrease the overall scouring action in this drain.

D. Air bound the drain.

Proper venting eliminates most causes of the loss of trap seals. One method of the trap seal loss that venting has no bearing on is:

A. Momentum.

B. Evaporation.

C. Back pressure.

D. Self-siphonage.

Soil and waste stack are being installed in a 25-story building.Yoke relief vents should be provided:

A. 12th and 20th floors.

B. 5th and 15th floors.

C. 8th and 19th floors.

D. 10th and 20th floors.

A branch vent that serves two or more traps and extends from in front of the lat fixture connection of a horizontal branch to the vent stack is:

A . Loop vent.

B. Circuit vent.

C. Relief vent.

D. Continuous vent.

A centrifugal pump operates at best advantage when set:

A. 32 ft. above water line.

B. 20ft. above water inlet.

C. 10 ft. above water inlet.

D. 10 ft. below water line.

If a set of sanitary planes are drawn to scale of 3/4 inch = 1 foot, the plans can be said to be:

A. 1/16 size.

B. 1/8 size.

C. 3/8 size.

D. 3/16 size.

Even if entire vent system were perfectly installed, a fixture trap can till lose its seal. The normal reason for such occurrence is most likely:

A. Evaporation.

B. Back-pressure.

C. Siphonage.

D. Capillary action.

The symbol for a valve shown on the figure #10 best describes:

A. Flanged check valve.

B. Screwed union.

C. Flanged gate valve.

D. Bell and spigot reducer.

A fresh-air-inlet plate was supplied with sixty-three (63) 1/2-inch holes. The maximum size of fresh-air-inlet pipe is most nearly:

A. 3 in.

B. 4 in.

C. 6 in.

D. 5 in.

When a fixture trap is set greater than two feet away from its vent connection, the trap may lose water seal due to:

A. Back pressure.

B. Evaporation.

C. Momentum.

D. Self-siphonage.

The mixture of wiping solder is:

A. 30-60.

B. 40-60.

C. 60-40.

D. 70-30.

The length of threaded engagement for two inch pipe is most nearly:

A. 3/8 inch.

B. 5/8 inch.

C. 7/8 inch.

D. 1-1/2 inch.

The threads per inch on a 1-1/2 inch pipe:

A. 8.

B. 11-1/2.

C. 14.

D. 18.

The proper reading of the tee fitting on figure #11:

A. 1-1/2"x1"x1-1/2".

B. 1-1/2"x1-1/2"x1".

C. 1"x1-1/2".

D. 1-1/2"x1"x1".

W.O.G. on a valve refers to:

A. Steam working pressure.

B. Water working pressure.

C. Water, oil and gas.

D. Female Std. pipe size.

Minimum size vent penetration through roof:

A. 2 inch.

B. 2-1/2 inch.

C. 3 inch.

D. 4 inch.

A flushometer valve to a water closet, the centerline on the vacuum breaker shall be a minimum length above top of fixture supplied:

A. 1".

B. 2".

C. 4".

D. 6".

Dimension "A" on the figure #12 is:

A. 40inches.

B. 28 inches.

C. 23 inches.

D. 20 inches.

The valve with the greatest resistance to flow:

A. Globe.

B. Swing check.

C. Angle.

D. Gate.

Screwed drainage fittings have a shoulder, the I..D. of the shoulder is equal to:

A. I.D. of schedule 40 pipe.

B. I.D. of schedule 80 pipe.

C. I.D. of schedule 120 pipe.

D. I.D. of C.I. drainage piping.

Flushometer with a clogged by-pass will cause the valve:

A. Not to open.

B. Not to close.

C. Flush to shot.

D. To open but not let water pass.

Fitting with male and female threads is:

A. Shoulder nipple.

B. Tank nipple.

C. Reducing coupling.

D. Street ell.

4 - 1/8 bends and 6 -1/4 bends have a total offset equal to:

A. 360* .

B. 450*.

C. 540*.

D. 720*.

A nipple a taper thread and straight locknut thread is:

A. Tank nipple.

B. Close nipple.

C. Shoulder nipple.

D. Radiator nipple.

To thread a stub from a tank, we could only thread only a portion of pipe, if we revers the dye we would:

A. Strip the thread.

B. Cross thread.

C. Lengthen the thread.

D. Made L.H. thread.

A spring tube bender is for:

A. Soft copper or aluminum.

B. "K" copper.

C. "L" copper.

D. Stainless steel.

An effective tool to cut 3-inch copper below the floor:

A. Tin snips.

B. Internal tube cutter.

C. Cape chisel.

D. Acetylene torch cutter.

A faucet leaks around the stem requires replacing:

A. Bonnet.

B. Washer.

Cf. Seat.

D. Packing.

A 4-inch lead bend connection to 4-inch T-wye the adapter used:

A. Brass ferrule.

B. Double hub.

C. Solder nipple.

D. Brass flange.

The maximum interval supports for two inch copper tubing:

A. 6 ft.

B. 8 ft.

C. 10 ft.

D. 12 ft.

A drawing is drawn to 1/4-inch per foot. A line on the drawing 14-3/8 inch is most nearly equal to:

A. 14 ft.

B. 47 ft.

C. 57 ft.

D. 115 ft.

The symbol shown on figure #13 is:

A. Screw check valve.

B. Cast iron backwater valve.

C. Bell & spigot C.O. plug.

D. Screw reducer.

A six inch 125 lb. standard iron companion flange, has how many holes: A, B, C or D. See figure #14.

The maximum number of fixture units permitted on an 1-1/2 inch branch vent pipe of 30 feet when the waste branch is 3 inches is most nearly:

A. 25.

B. 20.

C. 15.

D. 10.

A branch vent has 60 fixture units connected to it and a developed length of 120 feet connected to the vent stack; the size of the waste branch is 4 inch, What is the size of the branch vent is:

A. 4 inch.

B. 3-1/2 inch.

C. 3 inch.

D. 2-1/2 inch.

A vent stack that has 250 fixture units connected to it, a developed length of 250 feet with a 4 inch soil stack, it will require a minimum size vent stack of:

A. 3 inch.

B. 4 inch.

C. 5 inch.

D. 6 inch. ```

A 3" soil branch, has a branch vent which has 42 fixture units connected to it, a developed length of 100 feet of vent pipe is to connect to a vent stack that has a 4 inch companion soil stack, the total length of the vent stack is 100 feet, what is the minimum diameter of the vent stack:

A. 5 feet.

B. 4 inch.

C. 3 inch.

D. 2-1/2 inch.

The maximum number of fixture units permitted on a 2-inch branch vent of 86 feet developed length with a 3 inch soil branch is:

A. 53.

B. 102.

C. 21.

D. 10.

The protection of trap seals from siphonage or back pressure shall be accomplished by the use of properly installed vents, so that at no time shall the trap seal be subjected to a pressure differential of more than :

A. 1-inch of water column.

B. 2-inch of water column.

C. 3-inch of water column.

D. 4-inch of water column.

According to the new plumbing code local law 99-2005 of the international Plumbing Code of 2003 as amended by New York City , when soil, waste or vent pipe are extended through the roof, they shall have a minimum diameter of:

A. 4".

B. 5".

C. 6".

D. 3".

A vent stack is installed in such a manner that it does not receive the wash of the adjoining wast stack. Which regard to this , it can be said that:

A. It is illegal and not permitted.

B. It is legal and permitted.

C. The new code LL 99/2005 makes no mention of this situation.

D. The new code mentions the situation but requires a ruling each time.

The one statement is nearly correct when a roof is used for other than weather protection is the roof vent extension shall terminate:

A. 3 feet above the roof within 8 feet of the window.

B. 4 feet above the roof unless roof is pitched at an angle of 30* or greater from the horizontal.

C. 2 feet above the roof unless roof is pitched at an angle of 30* or less from the horizontal.

D. 7 feet above the roof when the roof is flat.

Suds pressure zone shall be considered to exist when the soil or waste stack serves fixtures that receive wastes containing sudsy detergents on:

A. 4 or more floors.

B. 3 or more floors.

C. 2 or more floors.

D. Any floor.

A horizontal branch vent line should:

A. Be pitched downward toward the vent stack.

B. Be pitched downward toward the branch waste or branch soil line being vented.

C. Not pitched at all.

D. Be graded up from the branch waste or branch soil line being vented and then tied into the vent stack at the same elevation as the runoff of the trap of the branch waste or branch soil line.

In a given installation a 3-inch cast iron wast stack is to be extended through a sun deck. The extension shall be at least:

A. 3-inch diameter and 2'-0" above the roof.

B. 4-inch diameter and 2'-0" above the roof.

C. 3-inch diameter and 7'-0" above the roof.

D. 4-inch diameter and 7'-0" above the roof.

The size of each suds relief vent shall be at least:

A. 3/4 the diameter of the piping, but not less than 2-inches.

B. 3/4 the diameter of the piping, but not less than 1-1/2-inches.

C. 1/2 the diameter of the piping, but not less than 1-1/2-inches.

D. 1/2 the diameter of the piping, but not less than 2-inches.

In the horizontal drain at the base of a soil stack a suds pressure zone shall be considered to exist in the horizontal (downstream) portion within:

A. 10 stack diameters of the base fitting.

B. 20 stack diameters of the base fitting.

C. 30 stack diameters of the base fitting.

D. 40 stack diameters of the base fitting.

An offset in a 4-inch waste stack is to be provided with a relief vent. The minimum size relief vent for this stack is:

A. 2.in.

B. 1-1/2in.

C. 3 in.

D. 2-1/2 in.

With respect with fixture traps which are individually vented or circuit vented it can be said that these type of vents protect the seal of the trap against:

A. Capillary attraction and evaporation.

B. Momentum and evaporation.

C. Siphonage and back pressure.

D. Back siphonage and back pressure.

A roof terminal of a vent pipe is 8 feet from a window on an adjacent building.The top of this window is 5 feet above the elevation lf this vent pipe above the roof shall be (roof used for weather protection only):

A. 7 ft.

B. 8 ft.

C. 3 ft.

D. 2 ft.

A completed soil stack in a new installation is to be subjected to a water test. The roof (other than weather protection and flat) is 55 feet above the test tee at the base of the stack and from which point it is being tested With this stack full of water, the pressure in pounds per square inch, at the top of the test tee is most nearly:

A. 25.

B. 24.

C. 27.

D. 26.

When installing the vent piping for all fixtures on a given stack one should be careful that the branch vent pipes are so graded as to drip back by gravity to:

A. The vent stack.

B. Outside a suds pressure zone.

C. A local vent stack.

D. A soil or waste stack.

A connection between a vent pipe and a vent stack shall be made at least 6 inches above the:

A. Trap weir level of the highest fixture served.

B. Overflow level rim of the highest fixture served.

C. Flood level rim of the highest fixture served.

D. Water supply level of the highest fixture served.

A common vent may serve as an individual vent for not more than:

A. Two fixture drains.

B. Three fixture drains.

C. Three fixture traps.

D. Two fixture traps.

An 8 inch stack is to make an offset. When required, the minimum size relief vent for this stack offset is at least:

A. 5 in.

B. 4 in.

C. 3 in.

D. 2 in.

Which one of the following statements is most nearly correct:

A. When the roof terminal of any vent, soil or waste pipe within ten feet of any door, window, scuttle or air shaft, such as roof terminal shall extend at least five feet above such opening.

B. The vent opening from the soil or waste pipe, except for water closets and similar fixtures shall be above the weir of the trap.

C. The maximum distance that a branch vent shall be from a floor drain trap is fifteen feet.

D. Main vents or vent stacks shall connect at their base to the main soil or waste pipe at least three feet below the lowest waste branch.

No branch vent will be required when the distance from a floor drain trap to a vented line is not more than:

A. 2'-0".

B. 12'-0".

C. 15'-0".

D. 10'-0".

A relief vent shall be provided at the top of the vertical offset between horizontal portions of the building (house) drain when the vertical rise exceeds:

A. 15'.

B. 10'.

C. 8'.

D. 6'.

Soil and waste stacks shall be provided with a yoke relief vent in buildings having more than:

A. 10 branch intervals.

B. 8 Branch intervals.

C. 12 Branch intervals.

D. 7 Branch intervals.

Which type of fixture does not create a suds pressure zone at the base of the stack:

A. Laundry washing machine.

B. Dishwashing machine.

C. Kitchen sink.

D. Bathtub.

In an installation of a given plumbing system you find that the plumbing contractor has connected the vent stack to the soil stack at the point just below the lowest drainage connection being served by these stacks.These stacks are connected:

A. Not in exact accordance with the reference standards.

B. Not in exact accordance with the reference standard but need not be changed.

C. Acceptable.

D. Not good plumbing practice, although keeping with the R.S.

A vent terminal is within seven feet of an operable window which extends two feet above the roof. When the roof is used only for weather protection, the vent terminal height above the roof should be at least:

A. 4 ft.

B. 9 ft.

C. 7 ft.

D. 5 ft.

The reason why a 3/4 "S" traps are not used:

A. They cannot be vented properly.

B. They are difficult to install.

C. They are prohibited by the reference standard.

D. They are difficult to replace.

The least likely location to find a "combination waste and vent system" is:

A. Repair garage.

B. Multiple dwelling.

C. High school.

D. Supermarket.

Where a fixture discharges directly into a soil or waste stack at a level above all other drain connections thereto, the stack vent may serve as the vent for the fixture trap provided that such vent connection is within:

A. 18 in.

B. 24 in.

C. 36 in.

D. 48 in.

A stack is being tested in its entirety from the roof terminal to a test tee at the base.The roof is used for other than weather protection and is flat, is 62 feet above the test tee. With the stack full of water the pressure at the test tee is most nearly:

A. 28.6 psi.

B. 29.9 psi.

C. 26.8 psi.

D. 27.8 psi.

Which one of the following statements is correct:

A. The size of the yoke relief vent shall be equal to the size of the vent stack to which is connected.

B. The size of the yoke relief vent shall be equal to the size of the soil or wast stack to which is connects.

C. The size of the yoke relief vent shall be equal to the size of the larger stack to which it connects.

D. The size of the yoke relief vent shall be equal to the size of the smaller stack to which it connects.

In a soil stack suds pressure zone shall be considered to exist in the horizontal portion within:

A. 10 stack diameters of the base fitting.

B. 20 stack diameters of the base fitting.

C. 30 stack diameters of the base fitting.

D. 40 stack diameters of the base fitting.

The vent pipe opening from a soil or waste pipe. except for water closets and similar fixtures, shall not be below the trap:

A. Crown.

B. Weir.

C. Dip.

D. Seal.

A suds pressure zone is considered to exist in a waste stack. When a 90* offset is made in the waste stack.The suds pressure zone shall exist in the vertical portion within :

A. 10 stack diameters of the offset base fitting.

B. 20 stack diameters of the offset base fitting.

C. 30 stack diameters of the offset base fitting.

D. 40 stack diameters of the offset base fitting.

The maximum distance between the branch vent and a 2 inch fixture trap weir is:

A. The maximum distance between the branch vent and a 2 inch fixture trap weir is:

A. 48 in.

B. 36 in.

C. 24 in.

D. 18 in.

Where a 60* and 90* fitting is installed in the horizontal drain, a suds pressure zone shall be considered to exist in the horizontal portion within:

A. 10 drain diameters upstream and 40 drain diameters downstream of the fitting.

B. 10 drain diameters upstream and 40 drain diameters downstream of the fitting.

C. 10 drain diameters upstream and 10 drain diameters downstream of the fitting.

D. 40 drain diameters upstream and 40 drain diameters downstream of the fitting.

You completed a job on an apartment house and it is reported that one of the stacks, when a water closet on the top floor is flushed, one of the fixture traps on the first story loses it seal. The most probable reason is:

A. The main vent stack is to small.

B. Trap seal of the fixture is undersized.

C. Main vent is connected to the soil stack 2'-6" above the lowest fixture.

D. Re-vent is obstructed.

An alteration involving the installation of several water closets, urinals, and basins is being made in a remote section of a large building, the main vent for these fixture is terminated on the upper floor through the wall.

This arrangement is:

A. Acceptable as a considerable cost for piping material.

B. Not acceptable as this piping arrangement is contrary to the plumbing code.

C. Acceptable as the stack cannot be closed due to hoarfrost.

D. Not acceptable as the stack cannot be closed due to hoarfrost.

The maximum distance between the vent branch and a 2 inch fixture trap weir is:

A. 48 in.

B. 36 in.

C. 24 in.

D. 18 in.

The primary difference between a schedule 40 pipe and a schedule 80 pipe, of the same material and size, is that the schedule 80 pipe is:

A. Weights more per liner foot.

B. Has a larger inside diameter.

C. Has fewer threads per inch.

D. Has a thinner wall thickness.

The maximum number of branch intervals connected to a soil or waste stack before a vent stack is required to be installed is:

A. 4.

B. 2.

C. 1.

D. 3.

Name at least 15 different types of vents permitted in New York City?

The accepted method for sizing of the vent pipes is:

A. To install vents as the same size as the fixture outlets.

B. To install vents 1/2 the diameter of the waste pipe.

C. Use a mathematic formula.

D. To use tables developed by governmental authorities.

The best type of vent systems to use is:

A. A wet type.

B. A circuit system.

C. A combination wet vent and yoke vent system.

D. Every trap to be vented, to properly sized venting system.

Which one of these fixtures would lose their trap seal by capillary attraction:

A. Sink.

B. Urinal.

C. Drinking fountain.

D. Laundry tray.

The best rule to follow to avoid fouling of vent piping as to:

A. To provide clean outs on vent lines.

B. Always oversize vent pipe.

C. Never to use the vent as a waste or waste as a vent.

D. Install vents so that they occasionally receive the overflows of wastes.

The greatest thread to our potable water supply system is:

A. Lack of reservoirs.

B. Increasing demand.

C. Pollution.

D. Evaporation.