Plumbing - Session 11 Part 2

Paint is not permitted on the jointing material at a joint in cast iron pipe:

A. At any time .

B. Until two days after construction of the joint.

C. Until the entire plumbing installation is completed.

D. Until after the joint has been tested and approved.

Drainage pipe clean-outs are required:

A. To be not more than 80 feet apart in a horizontal direction.

B. To extend horizontally from an underground drain.

C. At each change of direction of the building drain greater than 45*F.

D. To be 3/4 the nominal size of the pipe for diameters up to 4 inches.

All water used in the construction of the buildings shall be metered when the building is higher than:

A. 3 stories.

B. 4 stories.

C. 5 stories.

D. 6 stories.

Gas piping should be tested under of pressure of no less than:

A. 3 psig.

B. 5 psig.

C. 7 psig.

D. 9 psig.

When installing gas lines in a building, it is permissible toL:

A. Reuse gas pipe which has been removed from an existing installation.

B. Use gas piping for an electrical ground.

C. Use malleable iron fittings.

D. Use gasket unions.

The pipe fitting which should be used to connect to a 1" pipe to a 1-1/2" valve is a:

A. Reducing elbow.

B. Bushing.

C. Reducing coupling.

D. Street elbow.

A 2-percent pitch in a pipe line os most nearly equal to a slope of:

A. 1/16" to the foot.

B. 1/8" to the foot. C 1/4" to the foot.

D. 1/2" to the foot.

The main function of a standpipe system in a building is to:

A. Supply water to the roof tank.

B. Keep the hot water circulating in order to maintain a constant temperature.

C. Provide water in case of fire.

D. Increase the pressure in the water supply system.

The one of the following valves which offers the least resistance to the flow of water is:

A. Check valve.

B. Gate valve.

C. Globe valve. Df. Angle valve.

The cast iron fitting that is called a tucker connection has:

A. Male threads on one end and female on the other end.

B. One end in the form of a hub and female threads on the other end.

C. On end in the form of a hub and male threads on the other end.

D. Each end in the form of the hub.

When bending copper tubing in the field, special equipment is required:

A. Only for hard temper tubing.

B. Only for soft temper tubing.

C. For both soft temper and hard temper tubing.

D. For neither soft temper nor hard temper tubing.

If the diameter of the vertical stack in a building is smaller than the diameter of the house drain which connected to it, then the bend which joins them should be:

A. At least one size smaller than the stack.

B. At least one size larger than the stack.

C. At least one size lager than the drain.

D. Larger then both the stack and the drain.

The fixture which has the smallest fixture unit rating:

A. Drinking fountain.

B. Lavatory.

C. Floor drain.

D. Bidet.

Pipe joint compound should be applied on:

A. The threads of the male fittings only.

B. The threads of the female fittings only.

C. The threads of both male and female fittings.

D. Either male or female threads, depending on the type of the fittings.

If a pipe with an outside diameter of 7" is to be fastened against the ceiling with a U-strap. the distance from the ceiling around the pipe and back to the ceiling should be approximately:

A. 14".

B. 16".

C. 18".

D. 20".

The main reason cast iron pipe is particularly suitable for underground service is that it:

A. Resists corrosion very well.

B. Has a low initial cost.

C. Is easy to handle and join.

D. Can withstand high pressure.

The best procedure to follow in most cases when pipe does not screw into a fitting easily, is to:

A. Use a heavier pipe wrench.

B. Cut the threads off the pipe and rethread.

C. Attempt to true up defective threads with a die or a tap.

D. Heat the fitting with a torch.

If the hand operated shut off valve in a water line is turned to the fully closed position, and the water continues to flow through the valve, the most likely defect a plumber would expect to find is:

A. A loose gland.

B. Excessive packing.

C. Improper seating of the valve disc.

D. A loose stuffing nut.

The main function of a trap in a drainage system is to:

A. Prevent freezing of the pipes.

B. Block of sewer gases.

C. Prevent loss of water pressure.

D. Catch rings and other objects.

A combustible gas which may be present in sewer air and which is explosive in the presence of oxygen:

A. Carbon dioxide.

B. Freon.

C. Hydrogen sulfide.

D. Nitrogen.

The main function of back water valve which is same times found in the connection between the water drain pipe and the city sewer system, is to:

A. Equalize the pressure between the drain pipe and the sewer.

B. Prevent sewer water from flowing into the drain pipe .

C. Provide pressure to enable the waste to reach the sewer.

D. Make sure that there is not too much water pressure in the sewer line.

If water flowing into the top of the tank at the rate of 150 gallons per hour and flowing out at the rate of 3/4 of a gallon every 20 seconds, then the amount of water in the tank is:

A. Increasing by 1//4 gallon per minute.

B. Increasing by 3//4 gallon per minute.

C. Decreasing by 1//4 gallon per minute.

D. Decreasing by 3//4 gallon per minute

A flexible coupling between a pump shaft and a motor shaft is generally provided in order to:

A. Reduce the load on the pump.

B. Permit excess heat to escape.

C. Permit minor misalignment between the shafts.

D. Increase the power of the motor.

The best way to prevent a water pocket from forming when two horizontal steam pipes of different diameter are joined is to:

A. Use an eccentric fitting.

B. Use a long fitting so that the slope between the pipes is very gradual.

C. Provide a drain cock.

D. Slope the pipe so that the smaller pipe is lower.

The best way to make a temporary repair in a water line with a small leak is by:

A. Wrapping a rag around it.

B. Welding or brazing it.

C. Using a clamped patch.

D. Drilling, tapping and inserting a plug.

Brass is an alloy of:

A. Lead and copper.

B. Lead and tin.

C. Tin and copper

D. Zinc and copper.

The information that a plumber would not normally expect to find on each section of cast iron pipe delivered from the factory is the:

A. Manufacturer's name.

B. Weight category.

C. Diameter.

D. Length.

Steel pipe is generally connected to copper tubing by:

A. Brazing.

B. Soldering .

C. Wiping.

D. Special fittings.

Pipe is galvanized by coating it with:

A. Chrome.

B. Tin.

C. Aluminum.

D. Zinc.

A return bend in a line changes the direction of flow by:

A. 45*.

B. 90*.

C. 135*.

D. 180*.

When lagging is used on steam pipes, its main function is to:

A. Compensate for expansion.

B. Prevent corrosion.

C. Reduce radiation heat loss.

D. Reduce steam leaks.

If the drain of a piping layout is made to a scale of 1/4 inch equals one foot, then a 7'-9" length of piping would be represented by a scaled length on the drawing of approximately:

A. 2".

B. 7-3/4".

C. 23-3/4".

D. 31".

A pipe reducing coupling normally has:

A. Two female threads.

B. Two male threads.

C. One continuous female thread.

D. one male and one female thread.

When an adjoining building is erected next to an existing building which is higher, all waste stacks of the new building shall be located a distance from the common lot line of at least:

A. 5 ft.

B. 10 ft.

C. 15 ft.

D. 20 ft.

The following traps are prohibited:

A. "P" traps.

B. Drum traps used as solid interceptors.

C. "S" traps.

D. Drum traps serving chemical waste system.

A pipe reducing coupling has:

A. Two female threads.

B. One connections female threads.

C. One male and one female thread.

D. Two female threads.

All bullhead tees have run openings which are:

A. Smaller than outlet.

B. Larger than outlet.

C. Of the sane size.

D. Of different sizes.

A close nipple:

A. Has a short section with no threads.

B. Is always less than 3/4" long.

C. Has ends of different diameters.

D. Has threads over its entire length.

A reducing tee always has:

A. At least one opening which is larger than the other two.

B. Opening of three different sizes.

C. A branch opening which is smaller than the run.

D. A branch which is at an angle of 45* degrees to the run .

In addition to acting as a filler between threads m, pipe joint compound also acts as a:

A. Lubricant.

B. Hardener.

C. Coolant.

D. Permanent bond.

The valve which is used to permit flow of water in one direction only is called:

A. Check valve.

B. Globe valve.

C. Gate valve.

D. Angle valve.

A method which should be used to free a pipe die from chips while threading a pipe is to:

A. Use as little lubricating oil as possible.

B. Set the die loosely on the pipe stock.

C. Clean the chips of the pipe after each thread is cut .

D. Partially back off the die at intervals during the turning process.

The main difference between making horizontal and vertical caulked joints in cast iron pipe is that when making up a vertical caulked joint you should not use a:

A. Smaller amount of lead.

B. Smaller amount of oakum.

C. Pouring rope .

D. Special caulking tool.

Assume that 2" pipe is connected to a (3") pipe by means of coupling. If the velocity of the flow in the 2" pipe is 36 feet per second, than the velocity of the flow in the 3" pipe is approximately:

A. 16 feet per second.

B. 24 feet per second.

C. 54 feet per second.

D. 81 feet per second.

When ordering a cross fotting which is to have two outlet openings which are 1" in diameter and two run openings which are 1-1/2" in diameter, a plumber should specify:

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

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

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

The least likely cause to a leak in a threaded pipe joint is that:

A. Not enough pipe joint compound was used.

B. The threads are not smooth.

C. The number of threads is not sufficient.

D. Too much pipe joint compound has been used.

The size of a drainage pipe in a storm drainage system shall:

A. Shall be reduced in direction of flow.

B. Shall not be reduced in direction of flow.

C. The sewer side of the pipe shall be smaller.

D. The upstream side of the pipe shall be larger than the downstream side.

The best way to assemble the line of piping between a waste stack and a trapped fixture is to:

A. Start at the fixture and work toward the waste stack.

B. Start at the waste stack and work toward the fixture.

C. Let the order of assembly be determined by the details of the proposed installation.

D. Work from the most accessible location.

When referring to a building drainage system. the term waste pipe should normally applied to:

A. A piping system which receives human feces.

B. A piping system which receives the drainage from a water closet.

C. A pipe that conveys only waste.

D. Any pipe which flows water.

Air chambers installed at individual fixtures before July 1, 2009:

A. Need not be accessible.

B. Shall be accessible.

C. Are required for loads of less than 5 fixture units.

D. Are required for loads of more than 5 fixture units.

When determining the maximum possible depth of water, all primary roof drains:

A. Shall be assumed to be blocked.

B. Shall be assumed not to be blocked.

C. The depth of water shall not be greater than 6 inches.

D. The depth of water shall not be greater than 4 inches.

In the storm drainage system:

A. Clean-outs shall mot be installed, in the event of heavy rain storm, leakage from any one of them can cause great damage.

B. Clean-outa shall not be installed over electronic equipment due to stoppages that may occur and serving them could be a catastrophe.

C. Clean-outs shall be installed in the storm drainage system and shall comply with the provision of this code for sanitary drainage pipe clean-outs.

D. There are no exceptions for the installations of clean-outs.

Backwater valve installed in a storm drainage system shall conform with section PC 715 in that:

A. Backwater valve installed in the branch drain to such area drain that may be subject to overflow.

B. Backwater valve installed in the branch drain to such area drain that may be subject to overflow pr in the building drain at its point of exit from the building storm drain and downstream from the building storm drain trap.

C. Backwater valve are mot required in the storm drain because they are subject to stoppages and require constant maintenance.

D. A & B above.

Plastic piping and fitting shall not be used in the installation of storm drainage systems when:

A. The residential building is greater than five stories in height.

B. The building is used for other than residential purposes.

C. When corrugated polyethylene piping and fittings is less than 12" in diameter.

D. A, B & C. or A & B.

Lead waste piping would be subject to the most rapid rate of corrosion from which of the following substances:

A. Acetic acid (concentrated).

B. Ethyl alcohol.

C. Mild solution of sodium chloride.

D. Anhydrous ammonia.

Copper tubing which has an inside diameter of 1-1/16 inches and a wall thickness of 0.095 inches has an outside diameter of which is most nearly:

A. 1-5/32 inches.

B. 1-3/16 inches.

C. 1-7/32 inches.

D. 1-1/4 inches.

Leadite under certain conditions was used to fabricate building house sewer joints and has a melting point of approximately:

A. 700*F.

B. 400*F.

C. 240*F.

D. 200*F

A wye fitting is to be installed in an existing 2-inch galvanize drainage pipe. The best method to cut this pipe when between two beams is:

A. Hack saw blades.

B. Acetylene torch.

C. 3-whee. cutter.

D. Hydraulic cutter.

In preparation to installing X.H.C.I. joints it would be necessary to heat the lead to over:

A. 1000*F.

B. 620*F.

C. 470*F.

D. 360*F.

Pneumatic tools are operated by the use of:

A. Electricity.

B. Fluid oil pressure.

C. Compressed air.

D. Steam.

If a trench is excavated 3'-0" wide by 5'-6" deep and 550'-0" long, the total number of cubic yards of earth removed is most nearly:

A. 30.

B. 90.

C. 275.

D. 825.

Manufacturers usually carry nipples in stock in varying in lengths to:

A. 6 inches.

B. 9 inches.

C. 12 inches.

D. 18 inches.

When installing C.I. building storm sewer pipe the reference standard used is:

A. ASTM A 74.

B. ASTM A 888.

C. CISP 301.

D. A, B & C.

"In determining the size of a storm drain,m, a number of factors must be taken into consideration. One factor which makes sizing the storm drain difficult is the matter of predicting rainfall over a given period. Using a maximum estimate based in the 100-year hourly rainfall rate of 3-inches per hour, the approximate volume of water that will fall on a roof or surface in one hours time can be determined readily. Another factor is the pitch and the material of the roof or surface upon which the rain falls. A surface that has a pitch and smooth surface would increase the flow of water into the drain pipe." According to the above paragraph, the statement which includes all factors needed to determine the size of the drain pipe is the:

A. Maximum rainfall on the surface.

B. Pitch and surface of the area.

C. Equal to that amount of water falling on a flat roof.

D. Equal to that amount of water falling on a pitched roof.

"In determining the size of a storm drain,m, a number of factors must be taken into consideration. One factor which makes sizing the storm drain difficult is the matter of predicting rainfall over a given period. Using a maximum estimate based in the 100-year hourly rainfall rate of 3-inches per hour, the approximate volume of water that will fall on a roof or surface in one hours time can be determined readily. Another factor is the pitch and the material of the roof or surface upon which the rain falls. A surface that has a pitch and smooth surface would increase the flow of water into the drain pipe." According to the above paragraph, a roof has 45* pitch would probably have a drain pipe size:

A. Smaller than a roof with no pitch.

B. Larger than a roof with no pitch.

C. Equal to the of a flat roof.

D. Equal to the amount of the water falling in ten minutes.

A Master plumbers' license shall be issued to each successful applicants by the commissioner of:

A. Housing and human development.

B. D.E.P.

C. Department of buildings.

D. Department of health.

Doubling the diameter will increase its cross-section area four times. If a 1-inch diameter is doubled, the area of the larger circle is most nearly:

A. 1.57 sq.in.

B. 4.00 sq.in.

C. 3.14 sq.in.

D. 2.00 sq.in.

A roof of 2,724 square feet is pitched toward the leader at 1/8 inch per foot. The horizontal storm drain is pitched towards the building (house) drain at 1//4 inch per foot, The minimum size leader is most nearly:

A. 2-1/2-inches.

B. 3-inches.

C. 4-inches.

D. 5-inches.

For a storm drainage system of 4,000 square feet, the drain size and pitch to be installed is:

A. 4-inch at a pitch of 1/2 unit vertical in 12 unit horizontal (4-percent slope).

B. 5-inch at a pitch of 1/4 unit vertical in 12 unit horizontal (2-percent slope).

C. 5-inch at a pitch of 1/8 unit vertical in 12 unit horizontal (1-percent slope).

D. 6-inch at a pitch of 1/8 unit vertical in 12 unit horizontal (1-percent slope).

A roof 2,900 sq.ft. is pitched toward the conductor at 1/8 in. per. ft..The horizontal storm drain is pitched towards the building (house) drain at 1/4 in. per ft. The size of the individual conductor trap is:

A. 3-inch.

B. 4-inch.

C. 5-inch.

D. 6-inch.

For large industrial building the total number of roof and storm water drain line is 6. The number of roof drain lines is 4. All of these lines finally combine to a single-wye fitting downstream of the building (house) trap into the building (house) drain resulting in a combined storm and sanitary system.The minimum number of leader traps which may be used to serve these roof and yard storm water drain lines are:

A. 2.

B. 6.

C. 5.

D. 1.

The minimum distance that a building storm drain may be connected downstream from any soil stack is:

A. 10 feet.

B. 15 feet.

C. 20 feet.

D. 40 feet.

The available inlet area of a roof drain strainer used on sun decks shall be:

A. Not less then the area of the conductor or leader. B.. Not less then 1-1/2 times the area of the conductor or leader.

C. Not less then 2 times the area of the conductor or leader.

D. Not less then 3 times the area of the conductor or leader.

The smallest equivalent diameter of a square leader that may be installed that can drain the roof area of 1000 square feet is:

A. 2"x2".

B. 2-1/2"x2-1/2".

C. 3"x3".

D. 4"x4".

All drains carrying clear water, i.e. air conditioning drips, cooling water, etc, may discharge into the storm drainage system:

A. Behind a leader trap.

B. Through an indirect waste connection discharging into a trapped funnel or raised lip floor drain.

C. Through a back water valve.

D. When connected to a storm sewer.

Which one of the following statement is not correct:

A. Leaders when connected to a combined sewer shall be trapped.

B. When building storm drains are required to be trapped a fresh air inlet shall be installed.

C. Air-conditioning drains may connected into the storm drain provided, the drains are trapped.

D. One trap may serve more than one air-conditioning drain when within 15 ft. of the trap.

Where more than one building storm drain discharges into a private sewer within a property line, the sewer shall be designed to a velocity most nearly:

A. 8 ft. per sec.

B. 6 ft. per sec.

C. 10 ft. per sec.

D. 3 ft. per sec.

roof area 50 feet by 40 feet is connected to the (building) house drain at a point that receives 25 fixture units. At this point the combined storm and sanitary drain has a total allowance in square feet of most nearly:

A. 2,350

B. 2,400

C. 3,333

D. 2,500

Roof drain strainers shall extend above the surface of the roof a minimum of:

A. 2 in.

B. 4 in.

C. 6 in.

D. 3 in.

All roofs, paved area, yards, courts and courtyards shall drain into separate storm sewer system, or a combined sewer system, or to an approved place of disposal. In accordance with department of environmental protection requirements an approved system for beneficial collection and use of storm water may be installed in which case overflow from such a system shall be discharged to street storm sewer or street combined sewer. Whenever an alteration increases impervious surface on the lot greater than 20% of the impervious surface existing when the structure was constructed , such impervious surfaces shall drain into a storm sewer, or a combined sewer system, or to an approved point of disposal. With the exception of:

A. Commercial building less than 2,000 square feet.

B. Multiple dwellings containing less than 6 families.

C. Where the total area of the impervious surface proposed to be increased by an alteration after the effective date of this code is less than or equal to 1,000 square feet.

D. Gas service station.

A roof and area drain combine a total of 3,500 sq. ft. discharges through a trap to storm building drain. A soil stack of 1000 fixture units is then connected to the sanitary building drain. The size of the combined building sewer (minimum pitch) at this junction shall be a minimum:

A. 5 in.

B. 6 in.

C. 8 in.

D. 10 in.

The minimum capacity of a property installed dry-well draining the rain water of 1,800 square feet is most nearly:

A. 180 cu ft.

B. 240 cu.ft.

C. 300 cu.ft.

D. 360 cu.ft.

The pitch of the building storm drain was designed at a pit of 1/8 inch per foot and was installed at a pitch of 1% per foot. This installation can be said to be:

A. One have of the drainage pitch.

B. At the designed pitch.

C. Twice the designed pitch.

D. Four times the designed pitch

A heavy storm will rain at rate of 4 inches per hour, to be adequately designed a dry well must contain a 15 minute run-off. When the drained area is 720 square feet the capacity of the dry-well is most nearly:

A. 45 cubic feet.

B. 60 cubic feet.

C. 189 cubic feet.

D. 720 cubic feet.

A hole in a water pipe is estimated to discharge 1 pint of water every six minutes. If the hole doubled in size the loss of water per day is most nearly:

A. 250 gallons.

B. 60 gallons.

C. 125 gallons.

D. Unknown as the size of the hole was not determined.

A four family house, in which each family unit has one water closet (low down tank 1.6 gpf) , one lavatory, one bathtub, one bidet, emergency floor drain, and oner kitchen sink with food waste grinder and dishwasher.There is 4000 square feet of storm water area to be drained. The size of the combined building sewer if installed at a pitch of 1/8 inch per foot is a minimum of:

A. 4".

B. 5".

C. 6".

D. 8".

What os the minimum diameter size of a leader or conductor:

A. 1-1/4".

B. 1-1/2".

C. 2".

D. 3".

What is the minimum diameter size of a horizontal storm drainage pipe at any pitch:

A. 1-1/2".

B. 2".

C. 2-1/2".

D. 3".

What is the minimum diameter size of a soil or waste vent stack:

A. 1-1/2".

B. 2".

C. 2-1/2".

D. 3".

What is the minimum diameter size waste stack:

A. 1-1/2".

B. 2".

C. 2-1/2".

D. 3".

What is the minimum size soil stack:

A. 1-1/2".

B. 2".

C. 2-1/2".

D. 3".

What is the minimum diameter size pipe for a combination drain and vent pipe connecting to a horizontal branch or stack:

A. 1-1/4".

B. 1-1/2".

C. 2".

D. 2-1/2".

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. A slope of 1/4 inch per foot is the minimum slope for pipe size:

A. 2" or less.

B. 2-1/2" or less.

C. 3" to 6".

D. 8" or larger.

American standard taper pipe threads are designed by specifying in sequence the nominal size, of threads per inch, and the symbols for thread series and form. What is the taper of the thread:

A. 1 in 16.

B. 0.75 per ft.

C. 1 in 12.

D. A & B.

How many threads per inch using the national pipe thread standard are there per inch on pipe diameters one through two inches:

A. 27.

B. 18.

C. 14.

D. 11-1/2.

The caulking ferrule specification for pipe size 4 inches in diameter has an inside diameter of: Aj. 5 inches.

B. 4-1/2 inches.

C. 4-1/4 inches.

D. 4 inches.

Soldering bushing shall be:

A. Yellow brass.

B. Stainless steel.

C. Red brass.

D. Galv. steel.

Fitting used in the drainage system for change in direction. A quarter bend may be permitted vertical to horizontal or horizontal to horizontal for a:

A. 3-inch or smaller fixture drain.

B. 2-inch or smaller fixture drain.

C. 1-1/2-inch or smaller fixture drain.

D. 1-1/4-or smaller fixture drain.

A floor drain shall have a minimum fixture unit value and size of trap:

A. 2 FU, 2" trap.

B. 2 FU, 3" trap.

C. 3 FU, 3" trap.

D. 4 FU, 3" trap.

A shower head over a bathtub or whirlpool bathtub attachment:

A. Does not increase the DFU valve.

B. Increases the DFU value.

C. Shall have a minimum flow pressure 4 psi.

D. Minimum pipe size 3/8".