Plumbing (C-36) Practice Exams

28.0 degrees

The boiling points at 0 degrees gas pressure in Fahrenheit are: Ammonia (NH3):

110.50 degrees

Carbon dioxide (C2H5CO2):

55.6 degrees

Ethyl Chloride (C2H5CL)

21.7 degrees

Freon (F-12) (CC12F2)

2.31

(Note: 1.0 / 0.433 = 2.31)

(Note: 1.0 / 2.31 = 0.433)

One pound of pressure per sq. in. of water equals ______ feet of water at 62 degrees F.

0.433

(Note: 1.0 / 2.31 = 0.433)

(Note: 1.0 / 0.433 = 2.31)

One foot of water at 62 degrees F equals ________ pounds pressure per square inch.

14.0 degrees

Sulfur Dioxide (SO2)

10.6 degrees

Methyl Chloride (CH3CL)

10.0 degrees

Freezol (iso-butane) (CH3) (3CH)

27,000 grains per regeneration cycle

What is the minimum size water softener that may be used for a one inch water line in order to prevent pressure drop?

4 ounces

(~7 IWC)

Gas pressures for gas systems vary widely. What is the working pressure normally used on hot water heaters installed at individual houses.

2,000 - 300

No more than ______ cu. ft. of fuel gas or ______ lbs. of liquefied petroleum gas may be stored inside.

Slotted plug core shut off valve

What type of valve is used to shut off the main from the service?

5"

A gas vent connector shall have a continuous rise from the appliance to the vent of not less than ____ per foot of length.

1/2".

The size of the supply piping outlet for any gas appliance shall be not less than:

-66

What is the specific gravity of natural gas?

6

A single-wall metal flue pipe installed to serve a gas fired water heater is required by code to have a min. clearance of _____ inches from any combustible type materials.

188 - 40

The melting point of propane is _______ degrees C. and the boiling point of propane is _______ degrees C.

138 - 0.0

The melting point of butane is _______ degrees C. and the boiling point of butane is _______ degrees C.

14".

Low pressure gas piping 1/2" is installed to convey gas at pressure not to exceed a water column of:

10,000 - 16

Mechanical ventilation must be provided when welding or cutting is done where there is less than ______ cu. ft. of air per welder, where the ceiling is less than ____ ft. high, or when working in confined quarters.

9"- 4"

Earthquake security straps for a hot water heater shall be installed _____ from the top of the tank and ____ from the bottom.

top of boiler.

Placement of safety valves on a boiler is on the:

1/2".

The size of the gas supply piping outlet for a recessed oven cannot be less than:

20

Oxygen cylinders must be stored at least ____ ft. from fuel gas cylinders or combustible materials.

1-1/2"-16 gauge.

The minimum size strap for a hot water heater is:

3 feet.

The maximum distance from a gas appliance that the shut off valve may be is:

18

Gas water heaters burning not more than 40,000 BTU's per hr. may be connected with approved metal tubing connectors having a nominal diameter of 3/8" and an overall length not to exceed _____ inches.

7

According to Code, exit terminals of mechanical draft systems must be located a minimum of ____ feet above grade when adjacent to public walkways.

Type C vent.

A gas vent pipe which passes through the roof of a building must be provided with a vent cap. According to Code, it must not obstruct or reduce the effective cross-sectional area of the vent outlet and can be used on all but a:

1200

__________ degrees F. is the approximate combustion point of natural gas.

6'

Maximum length of any gas flexible connector is ______.

1/2".

The water supply piping should be sized accordingly. Concealed pipe within a wall going to a fixture is:

Only A and B are applicable:

(A) The piping and equipment between the street gas main and the gas piping system inlet;

(B) Piping and equipment which is under the control and maintenance of the serving gas supplier.

The term "service piping" refers to which of the following?

1/2".

The minimum size of a fixture water supply pipe for a single shower head is:

1/2".

The minimum size of a fixture water supply pipe for a domestic dishwasher is:

1/2".

The minimum size of a fixture water supply pipe for a wall hydrant is:

1/2".

The fixture supply pipe for women's restroom lavatories rated at 2 cwsfu each is ___ size.

5'.

Discharge from relief valves of liquefied petroleum piping systems shall be into open air and shall be horizontally away from any opening into a building which is below such discharge not less than:

3/4".

The water supply piping should be sized accordingly. The first section of a water pipe within a building is:

3/8".

The minimum size of a fixture water supply pipe for a bidet is:

1"

At the point where a 1/2" lavatory fixture branch joins a 3/4" urinal fixture branch pipe, the demand increases to 14 cwsfu and the pipe increases to ___ size.

1'.

Labels on copper tubing systems shall be permanently affixed to the tubing at walls, floors or partitions penetrations within:

3/4".

The water supply piping should be sized accordingly. Sillcock is:

1".

The minimum size of a fixture water supply pipe for a flush-valve toilet is:

1/2".

The minimum size of a fixture water supply pipe for a wall hydrant is:

1/2".

The minimum size of a fixture water supply pipe for a flush-tank urinal is:

underground.

Combination stop-and-waste valves are not allowed to be installed:

at the same location except where impractical.

Where more than one gas meter is set on a specific premises, they shall all be set:

80

An approved pressure-reducing valve must be installed in a water service pipe of a building, near where the pipe enters a building, when the street pressure of the water main providing potable water exceeds ____ pounds per sq. inch.

3/8".

The minimum size of a fixture water supply pipe for a lavatory is:

Quick-closing valves

Under normal conditions, a water hammer arrestor is required whenever certain valves are used, which of the following valves are of a type to require such a device?

Only B and C are approved tests:

(A) a minimum of 10 psi for 15 minutes.;

(B) at the discretion of the administrative authority to specify the pressure and duration of time.

The administrative authority shall inspect the test of fuel gas piping installations and the pressure required is:

the maximum hourly rating specified by the manufacturer.

The hourly volume of gas required at each piping outlet shall be taken as not less than:

3/4".

The minimum size of any gas piping outlet for a mobile home shall be;

1/2".

The minimum size of a fixture water supply pipe for a bathtub is:

1/2".

The minimum size of a fixture water supply for a kitchen sink is:

1/2".

The fixture supply pipe for women's restroom lavatories rated at 2 cwsfu each is ___ size.

3/4".

The water supply piping should be sized accordingly. Pipe for more than three fixtures or a branch is:

1/2".

The minimum size of a fixture water supply pipe for a combination sink and tray is:

1/2".

The water supply piping should be sized accordingly. Fixture branch pipe is:

3/4".

The minimum size of a fixture water supply for a flush-valve urinal is:

1/2".

The minimum size of a fixture water supply pipe for a hose bibb is:

1/2".

The minimum size of a fixture water supply pipe for a laundry tray with up to 3 compartments is:

6'.

Labels shall be spaced throughout copper tubing systems at maximum intervals of:

black letters on a yellow field.

Copper tubing systems shall be identified with an appropriate label to indicate the piping system conveys fuel gas. Labels shall be:

Only A and C apply:

(A) welded;

(B) flanged.

All joints in fuel gas piping shall be:

identified and labeled to show the fixture being served.

When valves are installed in locations which are not adjacent to the fixture or appliance being served, the valves must be:

gate valve (also known as a fullway valve)

Of the following valves, the one code-approved for a building water service line is the:

25

Flow pressure ranges from 8 psi for faucets and tank-type water closets to ___ psi for certain models of flushometer valve.

Flanged

Which of the following types of joints are not used to join copper tubing?

3/4".

The water supply piping should be sized accordingly. Pipe extending from the water main to water meter is:

1/2".

The minimum size of a fixture water supply for a service sink is:

one half inch diameter.

The minimum size of the supply piping outlet for any gas appliance shall not be less than:

the I.D.

Ferrous pipe (iron and steel) is measured by:

3

How many grades of wall thickness does the hard temper tubing come in?

14

How many threads per inch does a 1/2" pipe have?

White

Name the color used to denote brass pipe.

L

Name the medium wall thickness of copper tubing.

To change the direction of a soil or waste pipe from horizontal to vertical usually short quarter bends are used.

Which of the following is LEAST true?

Rigid stationary pipe clamps

What types of supports are used for PVC piping? Which of the following is LEAST true?

1136 sq. in.

The minimum floor area of a shower stall must be:

Where a trap can not be vented

The use of a deep seal trap is required in which of the following situations?

Never

Should a damper be installed in the vent to all gas water heaters as a matter of safety?

where those structures allow combustible construction.

ABS or PVC drainage installations are limited to residential construction:

PVC schedule 80.

Plastic piping from a septic tank to a drainfield located under paving shall be:

Vitrified clay pipe is ordered by the piece.

Which of the following is MOST FALSE when working with vitrified clay pipe?

Drainage pipe fittings are the same as water supply fittings.

Which of the following is LEAST true?

2 inches

What is the smallest diameter of pipe that should be used for floor drain waste lines?

Black

Name the color used to denote copper pipe.

4 hours

If the maximum test pressure is to be maintained at 160 psi, what is the minimum curing time for cemented joints on 2" PVC schedule 40 pipe with ambient temperature at 50 degrees F.?

DWV.

Copper tubing for both above and under ground drainage and vent piping shall have a weight of not less than that of copper drainage tube type:

Green

What color is the stripe of the thickest walled (Type K) copper tubing?

open floor drain.

A refrigerator must be drained into a/an:

Yellow

Type DWV drain copper tubing is marked with what color identification stripe?

a water pressure regulator is installed.

A pressure relief valve is required when:

80

The minimum schedule recommended for plastic pipe to be threaded is:

horizontal to vertical.

A sanitary tee may be used to change the direction from:

It's more durable

What is the main reason for using thick wall as opposed to thin wall copper pipe?

All of the above:

(A) galvanized pipe;

(B) plastic pipe;

(C) copper type K, L, or DWV.

Soil, waste and vent piping above ground within buildings over deleterious fill may be: