Master Plumber Past Board Exam Questions - SET 1

Of the four board subjects given for Master Plumbers examination, which of this subject was originally split into two subjects?

A. Plumbing Code

B. Design and Installations

C. Plumbing Arithmetic

D. Practical Problems

D

Copper tube and fittings used for drainage and vent piping installed above ground shall be at least ____.

A. Type DWV

B. Type L

C. Type K

D. Type M

A

A domestic dishwasher drain shall first connect to ____.

A. an approved airgap fitting

B. a double-check valve

C. a triple-check valve

D. an approved valve

A

Unions shall be installed in a water supply system within ____ to a water heater

A. 36 inches

B. 12 inches

C. 24 inches

D. 48 inches

B

A branch line serving a trap in a combination waste and vent system is required to be separately vented when the length of the branch exceeds ____.

A. 15

B. 10

C. 5

D. 25

A

Three-inch horizontal drainage piping shall be run in practical alignment and at a uniform slope of not less than:

A. 1/4 inch per foot

B. 1/16 inch per foot

C. 1/2 inch per foot

D. 1/8 inch per foot

A

The minimum requirement for the slope of horizontal drainage pipes between manholes is

A. 4%

B. 2-1/2 %

C. 2%

D. 3%

C

A drain connecting the compartments of a set of fixtures to its trap is called a(an) ____.

A. continuous waste

B. special waste

C. indirect waste

D. combination waste and vent

A

The maximum number of lavatories on a 2-1/2 inch horizontal waste line is ____.

A. 10

B. 14

C. 20

D. 6

B

The maximum distance a gas shutoff valve may be from a gas appliance (except for range and dryer connectors) is ____.

A. 6 feet

B. 10feet

C. 3 feet

D. 2 feet

A

An ejector discharge line shall be provided with a ____

A. gate valve only

B. backwater valve and gate valve

C. backwater valve only

D. swing check valve and a globe valve

B

In the water test of the entire plumbing system all openings should be tightly closed except at

A. protruding cleanouts

B. bleeders

C. stack vent

D. highest opening

D

Because of structural conditions, a 4-inch house drain is installed with a slope of 1/8 inch per foot. This installation will result in a(an) ____.

A. increased scouring and cleansing action

B. reduction in fixture unit loading allowance

C. separation of solids and liquid

D. increased allowance in fixture unit loading

B

A ____ may be installed with indirect waste

A. water closet

B. domestic kitchen sink

C. drinking fountain

D. lavatory

C

A ____ trap is not self-cleaning

A. plaster

B. cast-iron

C. bell

D. grease

D

Chemical or industrial liquid wastes that are likely to damage the public sanitary sewer system shall ____.

A. be pretreated to render them innocuous

B. not be used under any condition

C. be drained into a holding tank

D. be drained into a storm drain

A

A seamless drawn-brass fixture tailpiece shall be ____.

A. 24 B&S gauge

B. 20 B&S gauge

C. 22 B&S gauge

D. 26 B&S gauge

B

Hub and spigot cast-iron piping in 10-foot lengths, installed horizontally, shall be supported at intervals of not more than ____.

A. 10 feet

B. 12 feet

C. 5 feet

D. 15 feet

A

Water heater vents terminate above a roof surface at least ____ from a vertical wall.

A. 12 inches

B. 6 inches

C. 8 feet

D. 3 feet

A

The distance from the center of a water closet to any side wall or partition shall not be closer than ____.

A. 15 inches

B. 12 inches

C. 24 inches

D. 30 inches

A

Drinking fountains may be installed with ____.

A. steel pipe

B. indirect wastes

C. yoke venting

D. bell traps

B

Joints at the roof around pipes shall be made watertight by the use of ____.

A. epoxy glue

B. flashings

C. waterproof paint

D. tar and paper

B

A device to prevent backflow into the potable water system is called a ____.

A. backflow connection

B. siphon leg

C. backflow preventer

D. back-siphonage

C

Building sewers shall be tested by completely filling the sewer with water from the ____.

A. lowest to the highest point

B. lowest to at least ground level

C. lowest to at least a 5-foot head

D. lowest to at least a 10-foot head

A

A plumbing vent shall terminate not less than ____.

A. 3 feet from an air intake

B. 10 feet from an air intake

C. 1 foot above the roof

D. 5 feet above a window

B

Cleanouts may be omitted on a horizontal drain line less than 5 feet except for ____.

A. bathtubs

B. water closets

C. sinks

D. showers

C

Except for plastic piping systems, hot and cold water piping may be tested with ____.

A. 100 psi air for at least 10 minutes

B. 35 psi air for at least 15 minutes

C. 50 psi air or the working pressure of the water in the system for at least 15 minutes

D. 40 psi air or 150 psi water for 10 minutes

C

The depth of the finished dam of threshold for any shower, measured from the top of the drain, shall not be less than ____.

A. 4 inches

B. 12 inches

C. 2 inches

D. 9 inches

C

The vent for a kitchen sink serves as a drain for a laundry tub. The size of the wet-vented section is ____.

A. 1-1/2 inches

B. 3 inches

C. 2-1/2 inches

D. 2 inches

D

Gas piping with pressure less than 1/4-inch water column shall stand an air test of ____.

A. 50 psi

B. 30 psi

C. 15 psi

D. not less than 3 psi

D

Under no circumstances may gas appliance pressure regulators be vented ____.

A. to the gas utilization equipment flue or exhaust system

B. using black iron pipe

C. to the combustion chamber near the pilot

D. to the atmosphere

A

A water heater vent may have one offset of not more than 60 degrees from the ____.

A. heater

B. horizontal

C. roof

D. vertical

D

The aggregate cross-sectional area of all vents for a system with a required 4-inch sewer shall be at least ____.

A. 12.56 square inches

B. 4 square inches

C. 7.06 square inches

D. 18 square inches

A

That portion of a venting system that connects a water heater to a vent is a ____.

A. chimney connector

B. vent connector

C. Type B vent

D. vent

B

The minimum size of gas piping supply to a mobile home is ____.

A. 3/4 inch

B. 1/2 inch

C. 2 inches

D. 1 inch

A

Pilots and burners of gas-fired water heaters (except sealed combustion chambers) in residential garages shall be ____ above the floor level.

A. 24 inches

B. 12 inches

C. 18 inches

D. 6 inches

C

PEX piping installed horizontally must be supported every ____ inches.

A. 48

B. 24

C. 36

D. 32

D

One trap may serve a set of not more than ____.

A. three single-compartment sinks

B. two double-compartment sinks

C. two lavatories

D. three lavatories

A

The exit terminals of mechanical draft systems shall be ____.

A. in the same story

B. not over 10 feet from the vent

C. not less than 7 feet above grade

D. not over 20 feet from the vent

C

The minimum size waste pipe for a residential kitchen sink is ____.

A. 3 inches

B. 2-1/2 inches

C. 2 inches

D. 1-1/2 inches

C

Each drainage stack that extends 10 or more stories above the building drain shall be served by ____.

A. cleanouts at each floor

B. a parallel vent stack

C. extra-heavy fittings

D. straps every 5 feet

B

All trenches deeper than the footing of any building or structure and paralleling the same must be at least ____.

A. 2 feet deep

B. 45 degrees therefrom

C. 4 feet thereon

D. 2 feet wide

B

Above ground schedule 40 PVC and ABS DWV plastic piping installed horizontally shall be supported at intervals of no to exceed ____.

A. 10 feet

B. 6 feet

C. 2 feet

D. 4 feet

D

Three-quarter inch or 1-inch gas piping installed horizontally shall be supported at intervals not to exceed ____.

A. 6 feet

B. 4 feet

C. 8 feet

D. 5 feet

C

The terminal end of the drain for a pressure-relief valve shall not be ____.

A. painted

B. reamed

C. threaded

D. open

C

One material not approved for the installation of an external trap for a urinal is ____.

A. ABS

B. cast brass

C. drawn-brass tubing traps

D. cast iron

C

The minimum common horizontal waste pipe serving a bathtub, a lavatory, and a kitchen sink shall be at least ____.

A. 3 inches

B. 1 -1/2 inches

C. 2 - 1/2 inches

D. 2 inches

D

What kind of joint is not allowed in cast iron pipe?

A. welded

B. bell and spigot

C. threaded

D. soldered

C

Wall-mounted water closet fixtures shall be securely bolted to ____.

A. the vent piping

B. the drain piping

C. a closet bend

D. metal supporting members

D

The tailpiece for a lavatory shall not be less than ____.

A. 1-1/4 inch

B. 1-1/2 inch

C. 1 inch

D. 1-3/8 inch

A

Unless serving sinks or urinals, cleanouts may be omitted on a horizontal drain line that is

A. greater than 2.0 meters

B. less than 1.5 meters

C. equal to 2.0 meters

D. none of these

B

What kind of concealed connections on fixtures that it is required to provide an access panel or utility at least 0.3 meter in its least dimension for easy inspection and repair?

A. slip joint

B. hubless

C. ball and socket

D. flanged

A

The sizing of gas vents for category II, III and IV shall be in accordance with ____.

A. the manufacturers guide

B. the manufacturers instructions

C. the gas company

D. the vent connector company

B

For a vertical drainage line that is installed to be truly in vertical position, what is the allowed degree of the branch to be used?

A. 15

B. 60

C. 45

D. 22.5

B

The developed length between the trap of a water closet and its vent shall not exceed ____.

A. 4 feet

B. 12 inches

C. 30 inches

D. 6 feet

D

Single-wall metal pipe shall terminate at least 5 feet in vertical height above the highest connected equipment ____.

A. within a horizontal distance of 10 feet

B. draft hood

C. draft hood outlet or flue collar

D. or approved cap on the roof

C

When sizing a copper fuel-gas piping system that has an inlet pressure of less than 2 psi with a pressure drop of 0.3 inch w.c., the maximum cubic feet per hour of gas flow allowed through a 5/8-inch O.D. ACR tube 75 feet in developed length is ____.

A. 13

B. 48

C. 27

D. 68

C

No trap for any clothes washer standpipe shall be installed ____.

A. 18 inches above the floor

B. in a partition

C. 6 inches above the floor

D. below the floor

D

The total number of closets on a 3-inch stack is ____.

A. four

B. three

C. two

D. six

A

The maximum length for a 1-1/2-inch vent pipe is ____.

A. 50 feet

B. 60 feet

C. 20 feet

D. 30 feet

B

What is the minimum age requirement for an appointee to become a member of the Board of Master Plumbers?

A. Thirty five years old

B. Thirty two years old

C. Thirty years old

D. Twenty eight years old

C

The minimum horizontal distance between a water supply well and the building sewer is ____.

A. 50 feet

B. 100 feet

C. 10 feet

D. 15 feet

A

Fixture traps shall have a water seal of not less than ____.

A. 12 inches

B. 2 inches

C. 6 inches

D. 4 inches

B

Cast-iron soil pipe stacks shall be supported at ____.

A. their base and each floor

B. intervals of 10 feet

C. intervals of 5 feet

D. every other story

A

A refrigerator used to store food and that requires drainage shall be drained by means of ____.

A. an indirect waste pipe

B. both A and B

C. a direct connection

D. no drain required

A

No water heater (except direct vent water heaters and fuel burning water heaters installed in a closet with a listed, gasketed door assembly and listed self-closing device) that depends on the combustion of fuel for heat shall be installed in any ____.

A. garage

B. kitchen

C. basement

D. bedroom

D

The building sewer shall be determined on the basis of the total number of fixture units drained by such sewer in accordance with ____.

A. none of the above

B. the maximum fixture load only

C. the same table(s) as the building drain

D. Table 7-8 fixture unit loading

D

Soil and drain pipes located above food-handling establishments shall be subjected to a standing water test of not less than ____ feet.

A. 12

B. 25

C. 10

D. 15

C

A vent in a combination waste and vent system shall be approximately equal in area to one-half the ____.

A. area of the house sewer

B. cross-sectional of the drain pipe served

C. area of the public sewer

D. diameter of the drain pipe served

B

A vent in a combination waste and vent system shall be approximately equal in area to one-half the ____.

A. area of the house sewer

B. cross-sectional of the drain pipe served

C. area of the public sewer

D. diameter of the drain pipe served

B

Water service pipes, or any underground water pipes, shall not be run or laid in the same trench with ____.

A. piping for a lawn sprinkler

B. asbestos cement building sewer piping

C. cast-iron building sewer piping

D. any other water pipe

B

Sewer or other drainage piping that shall no be installed under or within 2 feet of any building or structure is ____.

A. ABS

B. cast iron

C. asbestos cement

D. copper

C

In each run of horizontal drain piping, the distance between cleanouts shall not exceed ____.

A. 50 feet

B. 300 feet

C. 75 feet

D. 100 feet

D

A type B-W gas vent shall terminate at least ____ feet in vertical height above the bottom of the wall furnace

A. 6

B. 12

C. 8

D. 4

B

The minimum size trap and trap arm for a kitchen sink is ____.

A. 1-1/2 inches

B. 2 inches

C. 3 inches

D. 2-1/2 inches

A

Sleeves shall be provided to protect all piping through ____ and ____ walls.

A. concrete, masonry

B. ceiling, wooden

C. wood, concrete

D. floor, concrete

A

Cast-iron soil pipe shall not be ____.

A. used belowground

B. painted

C. used for drain lines

D. threaded

D

Single-wall metal pipe shall be constructed of ____ not less than 0.0304 inch thick.

A. PVC Sch 40

B. galvanized, sheet steel

C. copper sheet metal

D. cast ironcast iron

B

The maximum horizontal distance of a trap arm is measured from the inner edge of the vent to the ____.

A. outlet

B. weir of the trap

C. dip

D. inlet

B

The vertical distance between a fixture outlet and the trap weir shall not exceed ____.

A. 18 inches

B. 36 inches

C. 12 inches

D. 24 inches

C

Nonmetallic shower sub-pans or linings may be built up on the job site of not less than ____.

A. three layers of 15 pound felt

B. two layers of 15 pound felt

C. four layers of 15 pound felt

D. one layer of 15 pound felt

A

The developed length of 1-1/2-inch trap arms shall not exceed ____.

A. 2 feet, 8 inches

B. 5 feet

C. 6 feet

D. 3 feet, 6 inches

D

A water system containing storage water-heating equipment will require a ____.

A. listed combination temperature and pressure relief valve

B. check valve

C. hot water return line

D. mixing valve

A

An indirect waste pipe 12 feet long requires ____.

A. a trap only

B. a trap and vent

C. no trap or vent

D. a vent only

A

Water closet tank ballcocks shall be installed with the vacuum breaker critical level at least ____.

A. 1 inch above the flush valve opening

B. 6 inches above the full opening of the overflow tube

C. 1 inch above the full opening of the overflow tube

D. 6 inches above the flush valve opening

C

The required clearance in front of a 3-inch cleanout is ____.

A. 6 inches

B. 18 inches

C. 12 inches

D. 24 inches

B

Ferrous gas piping installed underground in exterior locations shall have at least ____.

A. one double swing joint

B. two condensation drip leg

C. 1 foot of earth cover

D. four 90-degree elbows

C

Minimum clearance of listed appliances to any combustible wall or partition is ____.

A. 8 inches

B. 1 inch

C. specified in listing or rating plate and NFPA 211 Standard

D. 3 inches

C

Leaks in gas piping shall be located by applying ____.

A. fire or acid to the pipe joints

B. potable water to the interior of the piping tubing

C. soapy water to the exterior of the piping

D. a noncorrosive leak detection fluid

C

A fixture vent pipe increased one pipe size its entire length ____.

A. may exceed the maximum horizontal length limited by code

B. will be a better workmanship job

C. will increase the venting efficiency

D. will reduce the cost of installation

A

Vitrified clay building sewer pipe and fittings are ____.

A. unrestricted in use for drain lines

B. unrestricted in use for vent lines

C. approved for use inside of buildings and aboveground

D. approved for use at least 12 inches belowground

D

Sheet metal, constituting a part of any vent connector, shall be at least ____.

A. 0.0304 inches

B. 0.0505 inches

C. 0.0500 inches

D. 0.0450 inches

A