Plumbing - Session 3 Part 1

Two pieces of 1-1/2 inch waste lead was to be joined together. The total thickness of the joint (solder) and lead at its widest is most nearly:

A. 1-3/4 in.

B. 2-1/4 in.

C. 2 in.

D. 2-3/4 in ?

The primary purpose for plumbing pipes when passing through an arch, or pipe sleeve, or under a lintel, or through or under walls:

A. To provide accessibility for replacement of the pipes.

B. to protect against corrosion of the pipes.

C. To protect from breakage of the pipes.

D. To provide room for expansion of the pipes?

The primary purpose for using protective sheathing or wrapping when passing through concrete, cinder or other similar materials:

A. To withstand any reaction (corrosion) from the lime and acid of the concrete.

B. allow for expansion and contraction.

C. To prevent any rubbing action.

D. A,B &C.

The minimum inside diameter of a four (4") inch caulking ferrule is most nearly:

A. 4 in.

B. 4-1/4 in.

C. 4-3/8 in.

D. 4-1/2 in?

The one part of a plumbing system where copper or copper alloy tubing (type K,L) is not permitted is:

A. Underground building drainage and vent pipe.

B. above-ground drainage and vent pipe.

C. Building sewer pipe.

D. Chemical wast system.

The minimum weight percentage of antimony required in a lead alloy water closet floor flange is most nearly:

A. 5-5/8%.

B. 7-3/4%.

C. 11-1/2%.

D. 9-3/8%?

In any borough (except Manhattan), building (house) sewer shall be a minimum size of:

A. 4 in.

B. 5 in.

C. 6 in.

D. 8 in.

In a 5-story multiple dwelling, approved plastic piping shall not be installed for:

A. Drainage, above ground.

B. drainage, below ground within buildings.

C. Building house sewers.

D. Indirect waste piping.

Cleanout plugs shall be of brass and have a minimum thickness of at least:

A. 1/16 in.

B. 1/8 in.

C. 3/16 in.

D. 1/4 in?

It is necessary to install a section of water distribution piping underground. The one material that shall not be used is most nearly:

A. Copper or copper-alloy pipe.

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

C. Stainless steel pipe (type 304, 304L).

D. Galvanized wrought iron.

The minimum outside diameter of a 4-inch lead bend is most nearly:

A. 4 in.

B. 4-1/8 in.

C. 4-1/4 in.

D. 4-3/4 in?

A 1-inch water pipe is to be installed crosswise to wooden joists. The best location to cut the joists is most nearly:

A. More than 1.

5 inches from the nearest edge of the member.

B. center of joists, halfway between support.

C. Top of joists, halfway between supports.

D. Bottom middle of joists?

Piping for underground building drainage and vent pipe shall be: A - F?

Piping for above-ground drainage and vent pipe shall be: A - L?

A four (4") inch lead bend that is

30 inches long meeting the minimum requirements, weights most nearly:

A. 24 lbs.

B. 20 lbs.

C. 16 lbs.

D. 12 lbs. ?

The minimum depth of cast-iron floor flange shall be most nearly:

A. 2-1/2 in.

B. 3-1/2 in.

C. 3 in.

D. 2 in.

A lead shower pan having the minimum weight requirements is to have its edges welded with ears forming its corners. The minimum thickness of the lead joint is most nearly:

A. 1/16 in.

B. 1/4 in.

C. 1/8 in.

D 3/16 in.

Lead should not be used as a material for:

A. Roof flashing.

B. shower base.

C. Water piping.

D. Caulking.

A pipe that has a high percentage of sillicon is generally used for:

A. Oil separation system.

B. Acis waste system.

C. Sub-soil drainage.

D. Swimming pools?

A material that shall not be used for vent puping in a chemical waste system is:

A. Low expansion, borosilicate glass pipe.

B. Extea heavy cast iron soil pipe.

C. Approved plastic pipe.

D. Chemical stoneware pipe?

A shower pan, with ears forming the corners, has the dimensions 30"x30"x3", the minimum weight of sheet copper usednfornthisnpan is most nearly:

A. 5-3/4 pounds.

B. 4-3/4 pounds.

C. 8 pounds.

D. 6-1/2 pounds.

An equivalent discount of 30%,12%, and 5% is most nearly:

A. 31.5%.

B. 53.0%.

C. 41.5%.

D. 58.5%?

A standard screwed malleable fitting arenusually designed to withstand internal pressures of most nearly:

A. 100 psi.

B. 125 psi.

C. 150 psi.

D. 250 psi?

If a sheet copper pan fitted into a shower that measures

12 square feet, the minimum total weight of the sheet copper, allowed by code, is most nearly:

A. 6 lbs.

B. 9 lbs.

C. 12 lbs.

D. 48 lbs?

A sheet lead shower pan is to be used on an altertion job. It is to be 3 square feet and have

4 inch up-stand. The minimum weight when completed and readyfor installation is most nearly:

A. 50 lbs.

B. 54 lbs.

C. 58 lbs.

D. 62 lbs?

The USA gauge of flush pipe and fittings when brass or copper tubing is used, most nearly:

A. #22.

B. #20.

C. #24.

D. #18.

When open trenches are impractical, pipes may be installed by tunneling, jacking or a combination of both and are acceptable to the:

A. Commissioner.

B. Licensed plumber.

C. Owner.

D. Prime contractor.

Threaded cast-iron drainage fittings shall be most nearly:

A. Galvanized and recessed.

B. Galvanized but need not be recessed.

C. Recessed but need not be galvanized.

D. Neither recessed or galvanized.

Cast brass floor flange for water closets or similar fixtures shall be not less then:

A. 1/8 inch thick.

B. 3/16 inch thick.

C. 1/4 inch thick.

D. 3/8 inch thick.

Theee shower pans are to be installed on a particular job. They are to be rectangular in shape, 3'-0" x 3'-6", and to have 4" up-stand with the ends "eared over". If sheet lead cost

30 cents per pound, the cost of the three shower pans will be most nearly:

A. $18.50.

B. $55.00.

C. 38.00.

D. $46.00.

The installation of drainage street fittings are:

A. Permitted with commissioners' permission.

B. Permitted as it conforms to screwed drainage specifications.

C. Not prrmitted as it restricts the flow.

D. Permitted only where there are space limitations.

Approved plastic pipe and fittings may be used in residential buildings that have a heightbofbless than:

A. 7 stories.

B. 6 stories.

C. 5 stories.

D. 4 stories.

The minimum thickness of cast iron or galvanized malleable iron floor flanges is:

A. 3/16".

B. 3/8".

C. 1/4".

D. 1/2".

Trench shall be free from discarded construction material and debris. Loose earth free from rocks, broken concrete and frozen chunks shall be placed in the trench in 6 inch layers and tamped in place untol:

A. 12 inches above the invert of the pipenof tamped earth.

B. 6 inches above the invert of the pipenofntampednearth.

C. 12 inches above the centerline of the pipe of tamped earth.

D. The crown of the pipe is covered byn 12 inches of tamped earth.

Separate drainage systems for chemical waste shall be of an acidnresistant material, and is notnrequired, when the ph value of the waste is between:

A. 4.0 and 9.0.

B. 4.5 and 9.6.

C. 4.5 and 9.5.

D. 40 and 9.5.

Coating pipes with a varnish is most likely to:

A. Reduce the heat loss from the pipes.

B. Protect against external corrosion.

C. Protect against galvanic action.

D. Reduce the possibility ofnleaks. ```

Trenches shall be backfilled of tamped earth for one foot above the crown of the pipe in layers that are in :

A. 6 in.

B. 4 in.

C. 3 in.

D. 2 in.

The minimum weight of six 2-inch caulking ferres, twelwe 3-inch caulking ferrules and ten 4-inch caulking ferrules weighs most nearly:

A. 48 lbs.

B. 52 lbs.

C. 60 lbs.

D. 64 lbs.

Four 2-inch caulking ferrules, two 3-inch caulking ferrules and one 4-inch caulking ferrulenconforming to the minimum requirements of the code shall have a weight of most nearly:

A. 10 lbs.

B. 12 lbs.

C. 8 lbs.

D. 18 lbs.

A material not permitted to be installed for sub-soil drainage piping:

A. Open-jointed vitrified clay pipe.

B. Asbestos cement pipe that is open jointed or horizontally split.

C. Porous concrete pipe.

D. Stainless steel drainage systems.

The one material that shall not be used in water distribution piping systems:

A. Brass pipe ASTM B 43.

B. Stainless steel pipe (Type 304/304L).

C. Copper orncopper-alloy pipe ASTM B 42; ASTM B 302.

D. Galvanized iron pipe ANSI B36.20.

The outside diameter of 2" lead waste pipe is most nearly:

A. 2-1/2 in.

B. 2-1/4 in.

C. 2-1/8 in.

D. 2 in.

If a sheet lead pan fitted into a shower stall measures

12 sq. ft. , the minimum total weight of this most nearly:

A. 24 lbs.

B. 36 lbs.

C. 48 lbs.

D. 60 lbs.

The one material not permitted to be used in water service piping in a building under any condition is:

A. Red brass pipe ASTM B 43.

B. copper or copper-alloy tubing (type K);

C. Copper or copper-alloy tubing (Type L).

D. Ductile iron water pipe.

Lead bends have the same thickness as sheet lead that has a weight per square foot, of most nearly:

A. 4 lb.

B. 5 lb.

C. 6 lb.

D. 8 lb.

Copper tubing Type K and L may not be used for:

A. Above ground drainage and vent pipe.

B. Underground building drainage and vent pipe.

C. Building sewer pipe.

D. Sub-soil drain pipe.

Escutcheons orbmetal collars are installed around exposednpipes passing through walls and floors to:

A. To prevent teavel of pests along the pipes.

B. To permit expansion and contraction of the pipes.

C. To improve the appearance of the pipes.

D. To absorb the vibration of pipes.

A lundry tub is to be branch vented to the existing vent system. If a 1-1/2 inch lead pipenis to be used for the branch vent:

A. The maximum developed length permitted is 15 ft.

B. The maximum developednlength permitted is 5 ft.

C. The maximum debeloped length permitted is 2 ft.

D. It is notnpermitted.

The one material that shall notnbe permittednto be used for the installation of underground building storm sewer piping between two catch basins is:

A. High density poluethylene pipe (hdpe).

B. Ductile-iron pipe. .

C. Non-asbestos fiber cement pipe.

D. Hard temper "K" copper pipe.

A three-inch diameter cold waterbdistribution pipe is to be installed underground. The one material not approved fornthisbtype ofninstallation is:

A. Stainless steel pipe (type 304/304L).

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

C. Copper or copper alloy tubing (type K).

D. Brass pipe (60/40 composition).

In the installation of a building sewetva permitnfornsidewalknand street openings shall be obtained from the deparent of :

A. Buildings.

B. Public works.

C. Transportation.

D. Police.

"Any pipe that passes under a footing or through a foundation wall shall be provided with a relieving arch, or a pipe sleeve, pipe shall be two pipe sizes greater than the pipe passing through the wall."

The above staent will protect the pipe against:

A. External corrosion.

B. Freezing.

C. Cabe-ins.

D. Breakage.

The instrument most generally used to obtain the pressure in a natural gas line to gas ranges is most nearly:

A. Mercury gauge.

B. Manometer.

C. Bourdon gauge.

D. Pressuretrol.

A flaw in cast iron enameled plumbing fixtures is a slight depression in the enameled surface. This flaw is defined as a:

A. Craze.

B. Bubble.

C. Dimple.

D. Speck.

There is 160 feetnofnstorm water piping between catch basins. One catch basin is as dat -1.

57 ft. , and the slope of rhe storm pipe is 2%. The datum point of the downsteeam catch basin is most nearly:

A. -4.90 ft.

B. -1.57.

C. +1.76.

D. -3.33.

In a closet tank excessive water pressure can cause a rupture, but excessive waterbtemperature can cause:

A. Scalding.

B. "Banging" in the pipes.

C. Tank collapsing.

D. An explosion.

Before assembling rigid copper tubing, to be soft soldered, the external surfaces shall be made bright and coated with a solder flux which contains most nearly:

A. Tallow.

B. Sal ammoniac (Ammonium chloride).

C. Rosin.

D. Borax.

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

A. Loose gland.

B. Excessive packing.

C. Improper seating of the valve disc.

D. A loose stuffing nut.

An estimate of $6,600 was submitted for a plumbing contract. The plumbers' profit ratio was 20% of costs. What is the plumbers' profit on this wstimate:

A. $6,600.

B. $5,500.

C. $1,100.

D. $1,050.

By the "invert" of a horizontal building drain means the:

A. Top of the inside surface of the pipe.

B. Centerline of the inside diameter of the pipe.

C. Lowest portion or the bottom of the inside surface od the pipe.

D. Lowest portion of the outside surface of the pipe.

A slug waterbcompletely fills the stack. The cause for a fixture below the slug of water to lose its trap seal is:

A. Self-siphonage.

B. Back-pressure.

C. Momentum.

D. Aspiration.

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

A. Use an eccentric fitting.

B. Use a long fitting so that the slope between the pope is verybgradual.

C. Rovide a drain cock.

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

The acceptor's responsibility - the purpose of commercial standards is to establish for specific commoities, nationally recognized grades or consumer croteria and the benefits there from will be measurable in direct proportion to their general recognition and actial use. Instances will occur when it may be necessary to diviate from the standard and the signing of an acceptance does not preclude such departtures; however, such signature indicates an intention to follow the commercial standard where practical, in the production, distribution, or consumption of the article in question.

The word preclude as used in this paragraph means most nearly:

A. Permit.

B. Allow.

C. Include

D. Prevent.

The acceptor's responsibility - the purpose of commercial standards is to establish for specific commoities, nationally recognized grades or consumer croteria and the benefits there from will be measurable in direct proportion to their general recognition and actial use. Instances will occur when it may be necessary to diviate from the standard and the signing of an acceptance does not preclude such departtures; however, such signature indicates an intention to follow the commercial standard where practical, in the production, distribution, or consumption of the article in question.

The word intention as used in thisbparagraph means most nearly:

A. Agreement.

B. Impulse.

C. Objection.

D. Obstinate.

The acceptor's responsibility - the purpose of commercial standards is to establish for specific commoities, nationally recognized grades or consumer croteria and the benefits there from will be measurable in direct proportion to their general recognition and actial use. Instances will occur when it may be necessary to diviate from the standard and the signing of an acceptance does not preclude such departtures; however, such signature indicates an intention to follow the commercial standard where practical, in the production, distribution, or consumption of the article in question.

The word recognized as used in this paragraph means most nearly:

A. Desirable.

B. Stable.

C. Branded.

D. Accepted.

The acceptor's responsibility - the purpose of commercial standards is to establish for specific commoities, nationally recognized grades or consumer croteria and the benefits there from will be measurable in direct proportion to their general recognition and actial use. Instances will occur when it may be necessary to diviate from the standard and the signing of an acceptance does not preclude such departtures; however, such signature indicates an intention to follow the commercial standard where practical, in the production, distribution, or consumption of the article in question.

The word criteria as used in this paragraph means most nearly:

The acceptor's responsibility - the purpose of commercial standards is to establish for specific commoities, nationally recognized grades or consumer croteria and the benefits there from will be measurable in direct proportion to their general recognition and actial use. Instances will occur when it may be necessary to diviate from the standard and the signing of an acceptance does not preclude such departtures; however, such signature indicates an intention to follow the commercial standard where practical, in the production, distribution, or consumption of the article in question.

C. Usage.

D. Costs.

When a fixture trap is ser greater than two (2') feet below its fixture outlet, the trap may lose the water seal due to:

A. Self-siohonage.

B. Momentum.

C. Back-pressure.

D. Evaporation.

Siphonage may result in a hot water storage tank when the waterbservice pipe is:

A. Under excessive water pressure.

B. Shut off and a faucet on the supply line is opened in the basement.

C. Tapped for mixture with the hot water circulation line.

D. Oversized and excessive in length.

Trisodium phosphate (TSP) when used before a joint is brazed, is to primarily:

A. Remove surface scale.

B. Prevent oxide from forming.

C. Flux the surface.

D. Remove oil or grease. ```

A hot water storage tank is 24 inches in diameter and 10 feet in length its capacity, in gallons, is most nearly:

A. 180.

B. 240.

C. 300.

D. 360.

The copper or copper-zinc alloy pipe which is most easily corroded by the combined actin of oxygen, and carbon dioxide in the water is:

A. Copper pipe.

B. Yellow brass pipe.

C. Bronze pipe.

D. Red brass pipe.

Which one of the following statements is not correct:

A. Aspiration of a trap. Sea can occure when a slug of water completely fills the stack above the branch opening.

B. Water hammer is caused by the sudden closing of a valve.

C. Galvanized steel pipes will tend to corrode more rapidly when used for cold water lines than for hot water lines

D. The gas pressure in gas pipes is greater at the top of the line that at the base of the line.

Bare wrought iron, black steel pipe or galvanized steel pipe when laid in a cinder filled cellar floor. The probable result of running these lines in this manner is that:

A. The lines will tend to corrode.

B. A protective oxide coating will form on these lines.

C. The lines will last just as long if they were lid in dry clean sand.

D. A protective scale coating will form on these lines.

PC table 702.3, states that the ductile iron building sewer pipe shall conform to the Referenced Standard specification of AWWA C151. If you wish to secure a copy of these specifications you should write to the:

A. Federal specification (FS), 1941 Jefferson Davis Highway, Suite 04, Arlington, VA 22202.

B. National Sanitation Foundation (NSF), 789 Dixboro Rd.

C. American Water Works Association (AWWA), 6666 West Quincy Ave., Denver, CO 80235.

D. InternationalAssociation of Plumbing and Mechanical Officials, 5001 E. Philadelphia St. Ontario, CA 91761.

The rate of discharge from a "fixture unit" is approximately:

A. 7.5 cubic feet per minute.

B. 1 cubic foot per minute.

C. 1 gallon per minute.

D. One cubic foot per second.

The one material that shall not be used in underground building drainage and vent pipe is :

A. Cast-iron pipe.

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

C. Vitrified clay pipe.

D. Polyethylene (corrugated 12" and larger).

Water service piping outside of the properly line shall comply with the requirements of:

A. Department of buildings.

B. Department of environmental protection.

C. Department of health.

D. Department of health.

In private dwelling (less than 6 stories), the only material not permitted for underground building drainage and vent pipe is:

A. Stainless steel drainage systems, type 3161.

B. Cast-iron pipe.

C. Non-asbestos fiber cement pipe.

D. Concrete pipe.

When piping is to be installed in a trench and rock is encountered in trenching, the rock shall be removed to a minimum of 3 inches below the installation level of the bottom of the pipe, and the trench shall be backfilled to the installation level of the bottom of the pipe with sand and tamped in place so as to provide uniform load-bearing support for the pipe between the joints. The pipe, including the joints, shall not rest on rock at any point. The main reason for this is to:

A. Provide a bed for creosoted planks.

B. prevent damage to the pipe.

C. Increase the pitch of the pipe.

D. Provide a bed of sand.

Cleanout plugs when used in exposed or accessible locations may be of:

A. Brass cleanout plugs shall be utilized with metallic drain, waste and vent piping only and shall conform to ASTM A 74, ASME A112.3.1.

B. Plastic cleanout plugs shall be approved for installation with the piping material installed and shall conform to the respected pipe standards or one of the standards listed in table 702.4.

C. Cleanout plugs with borosilicate glass systems shall be of borosilicate glass.

D. A,B & C.

Abbreviation used in the Referenced standards chapter shall refer to the following organizations:

A. ANSI.

B ASME.

C. ASSE.

D. ASTM.

E. AWS.

F. AWWA.

G. CISPI.

H. CSA.

I. FS.

J. JAPMO.

K. NFPA.

L. NSF.

M. PDI.

In rock excavation the material that shall be removed, the best answer is :

A. Rock shall be removed to a minimum of 3".

B. Rock shall be removed to a minimum of 3" to 6".

C. Rock shall be removed to a maximum of 3".

D. Rock shall be removed to a maximum of 6".

Sheet lead is to be used that conforms to the minimum weight permitted for lead pans. The minimum thickness of this lead is:

A. 1/8 in.

B. 1/16 in.

C. 3/32 in.

D. 14 in.

If sheet copper that is used for general applications (i.e., shower pans) shall conform to ASTM B 152 and not weigh less than 12 ounces per square foot or .75 pounds; then what is the minimum requirement for sheet copper utilized for flush tank linings that shall conform to ASTM B 152:

A. 8 ounces per square foot.

B. 10 ounces per square foot.

C. 12 ounces per square foot.

D. 14 ounces per square foot. ```

If lead traps and lead bends shall be not less than 1/8" thick and weight 8 lbs per square foot, and sheet lead for and shall not weight less than 4 pounds per square foot, 1/16" thick, and sheet lead for vent flashings, field construction, shall weight not less 3 pounds per square foot 3/64" thick, then what is the minimum weight for sheet lead when its prefabricated for flashing:

A. 8 lbs/sq. ft.

B. 4 lbs./sq. ft.

C. 3 lbs. /sq. ft.

D. 2.5 lbs. /sq. ft. ```

What is the minimum weight of sheet copper used for bent pipe flashings, and it shall conform to ASTM B 152:

A. 8 ounces per square foot for vent pipe flashings.

B. 10 ounces per square foot for vent pipe flashings.

C. 12 ounces per square foot for vent pipe flashings.

D. 14 ounces per square foot for vent pipe flashings.

Tubular brass traps are generally known as:

A. "P" bends.

B. "J" bends.

C. 1/2 "S" bends.

D. "U" bends.

The one material to be placed above the pipes when backfilling trenches is nearly:

A. Clean medium stones.

B. loose earth free from rocks.

C. Broken concrete.

D. Clean loose cinder fill.

Eight 2-1/2 inch soldering bushings, eight 3 inch soldering bushings and eight 4 inch soldering bushings have a total weight of most nearly:

A. 35 lbs.

B. 40 lbs.

C. 50 lbs.

D. 55 lbs.

Portable wood stepladder longer than:

A. 10 feet shall not be supplied.

B. 20 feet shall not be supplied.

C. 25 feet shall not be supplied.

D. 30 feet shall not be supplied.

Tee branching on copper tubing, the process of making tee branches on copper tubing can be accomplished by using special tools to drill and form a collar for branch outlets on copper tubing. The branch tube is inserted into the outlet and:

A. Soldered using a minimum 95/5 solder.

B. welded.

C. Brazed.

D. A or C.

The term feasibility of connecting to an available public sewer, shall not mean:

A. The sewer is of adequate capacity to receive all sewage flowing from the building.

B. the building is in adequate physical condition to receive such sewage.

C. The sewer is located in the same drainage area as all or most of the lot or track of land on which the building is located.

D. The elevation of the sewer in relation to the lot or track of land on which the building is located is such that the conveyance of the sewage from the building to the sewer is impractical.

The term ABS used in piping materials approved for above- ground drainage and vent systems shall mean:

A. American business standards.

B. american standard institute.

C. Acrylonitrile butadiene styrene.

D. Polyvinyl chloride plastic pipe.

When public sewers are made available to premises with individual on site private systems, such private sewage disposal system shall be abandoned in a manner prescribed by the commissioner, and the owner shall connect the building house sewer to the available public sawer within ... Of the date of notification that the sewer has been accepted. To receive flow by the agency or agencies having jurisdiction:

A. Six months.

B. 1 year.

C. 18 months.

D. 2 years.

All abandonment of existing sewers shall be securely sealed at a point:

A. Outside the curb line and as close thereto as practical.

B. inside the curb line as close thereto as practical.

C inside the curb line and at least

2 feet there from.

D. At the curb line and as close thereto as practical.

Exposed soil or waste piping shall not be installed above:

A. Any bedroom area in residential buildings.

B. any healthcare facilities.

C. Any working, storage or eating surfaces in food surface establishments.

D. Any working area of any type.

Plastic pipe may be used:

A. In all buildings.

B. in all residential buildings.

C. All condominiums.

D. In residential buildings five stories or les in height. ```

When converting feet to meters you must multiply by a conversion factor:

A. 105'Pa.

B. 0.0689 bar.

C. 0.3048 m.

D. 25.4 mm ```

New York City building codes are based on the international codes, for the building code, Plumbing code, Mechanical code, and the Fuel gas codes what year is it designed on:

A. 2009.

B. 2008.

C. 2006.

D 2003.

The term solder;'a non-ferrous metal or metal alloy used, when melted, to join metal surfaces. Its melting temperature is below:

A. 450*F.

B. 500*F.

C. 71:0*F.

D. 840*F. ```