Plumbing (C-36) Practice Exams
Questions with Correct Answers
28.0 degrees - Answer-The boiling points at 0 degrees gas pressure in Fahrenheit are:
Ammonia (NH3):
110.50 degrees - Answer-Carbon dioxide (C2H5CO2):
55.6 degrees - Answer-Ethyl Chloride (C2H5CL)
21.7 degrees - Answer-Freon (F-12) (CC12F2)
2.31
(Note: 1..433 = 2.31)
(Note: 1..31 = 0.433) - Answer-One pound of pressure per sq. in. of water equals
______ feet of water at 62 degrees F.
0.433
(Note: 1..31 = 0.433)
(Note: 1..433 = 2.31) - Answer-One foot of water at 62 degrees F equals ________
pounds pressure per square inch.
27,000 grains per regeneration cycle - Answer-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) - Answer-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 - Answer-No more than ______ cu. ft. of fuel gas or ______ lbs. of liquefied
petroleum gas may be stored inside.
Slotted plug core shut off valve - Answer-What type of valve is used to shut off the main
from the service?
,5" - Answer-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". - Answer-The size of the supply piping outlet for any gas appliance shall be not
less than:
-66 - Answer-What is the specific gravity of natural gas?
6 - Answer-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 - Answer-The melting point of propane is _______ degrees C. and the boiling
point of propane is _______ degrees C.
138 - 0.0 - Answer-The melting point of butane is _______ degrees C. and the boiling
point of butane is _______ degrees C.
14". - Answer-Low pressure gas piping 1/2" is installed to convey gas at pressure not to
exceed a water column of:
10,000 - 16 - Answer-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" - Answer-Earthquake security straps for a hot water heater shall be installed
_____ from the top of the tank and ____ from the bottom.
top of boiler. - Answer-Placement of safety valves on a boiler is on the:
1/2". - Answer-The size of the gas supply piping outlet for a recessed oven cannot be
less than:
20 - Answer-Oxygen cylinders must be stored at least ____ ft. from fuel gas cylinders or
combustible materials.
1-1/2"-16 gauge. - Answer-The minimum size strap for a hot water heater is:
3 feet. - Answer-The maximum distance from a gas appliance that the shut off valve
may be is:
18 - Answer-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 - Answer-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. - Answer-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 - Answer-__________ degrees F. is the approximate combustion point of natural
gas.
6' - Answer-Maximum length of any gas flexible connector is ______.
1/2". - Answer-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. - Answer-The term "service piping" refers to which of the following?
1/2". - Answer-The minimum size of a fixture water supply pipe for a single shower head
is:
1/2". - Answer-The minimum size of a fixture water supply pipe for a domestic
dishwasher is:
1/2". - Answer-The minimum size of a fixture water supply pipe for a wall hydrant is:
1/2". - Answer-The fixture supply pipe for women's restroom lavatories rated at 2 cwsfu
each is ___ size.
5'. - Answer-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". - Answer-The water supply piping should be sized accordingly. The first section of
a water pipe within a building is:
3/8". - Answer-The minimum size of a fixture water supply pipe for a bidet is:
1" - Answer-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'. - Answer-Labels on copper tubing systems shall be permanently affixed to the tubing
at walls, floors or partitions penetrations within:
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