T/F: Refining iron-ore requires extreme heat and a reducing agent to draw oxygen out of the iron-ore. This reducing
agent, called coke, is a
... [Show More] grayish-black substance composed mostly of carbon. correct answer: True
GIVEN: Lead-and-oakum joints are strong. Plumbers make these joints by pouring molten lead over oakum fiber to form a
watertight seal. This fiber is a caulking material of old hemp rope or jute fibers that have been treated with tar or a tar-like
derivative.
QUESTION: What answer below shall be considered most correct to complete the following "Cast iron pipe & fittings"
related statement: Two types of oakum that are used by plumbers are __________. correct answer: Brown and white
GIVEN: A journeyman plumber and apprentice are installing cast iron piping in a commercial building. They are connecting
two branch lines entering the system from opposite directions. This fitting is designed to allow them to place the
horizontal runs and vertical runs centrally.
QUESTION: What answer below shall be considered most correct to complete the following "Cast iron pipe & fittings"
related statement: It is a ________ fitting that allows you to place the horizontal runs and vertical runs centrally. correct answer: Double sanitary tee
GIVEN: The trap is a simple, design solution to the plumbing problem of separating a living space from a sewage system.
The water seal in a trap prevents harmful gas and overpowering odors from entering the building through the fixtures.
Nonetheless, fixtures or receptors without traps are still found in some parts of the U.S. and in many other world
countries.
QUESTION: What answer below shall be considered most correct to complete the following "Cast iron pipe & fittings"
related statement: Fixture traps also ____________. correct answer: Obstruct vermin, i.e. mice, snakes and rats that attempt to enter a building through the DWV-system.
What answer below shall be considered most correct to complete the following "Steel pipe & fittings" related
statement: A piece of black steel pipe with a diameter 1⁄8" to 2" that is threaded at both ends and 7-inches long would be
referred to as a _______. correct answer: Nipple
GIVEN: A plumber/gasfitter is installing the potable water connections and gas piping connection associated with a
replacement water heater in a residential dwelling.
QUESTION: What answer below shall be considered most correct to complete the following "Steel pipe & fittings"
related statement: The potable water connection at the water heater may require the plumber to use a non-conducting
fitting that is designed to isolate dissimilar materials by using a combination of brass, plastic, or rubber termed a _____. correct answer: Dielectric union.
GIVEN: A plumber/gasfitter is completing the rough plumbing and gas connections in a new multi-residential condominium
building. The gas system is schedule 40 black steel with threaded joint connections. The piping being used ranges in sizes
from 1⁄2" to 1-1⁄4". Tee handle ball valves are being used as shutoffs at or near the final location of gas equipment.
QUESTION: What answer below shall be considered most correct to complete the following "Steel pipe & fittings"
related statement: The ball valves that are being used as shutoffs for gas equipment shall be _______type. correct answer: Full-port
What answer below shall be considered most correct to complete the following "Steel pipe & fittings" related
statement: Frequent operation and precise control of flow can be achieved using a _________ valve. correct answer: Globe
GIVEN: A plumber/gasfitter is completing the final gas connections in a new multi-residential condominium building. The
gas system is schedule 40 black steel with threaded joint connections. The piping being used ranges in sizes from 1⁄2" to 1".
QUESTION: What answer below shall be considered most correct to complete the following "Steel pipe & fittings"
related statement: A fitting that cannot be used as a gas piping connection is a ______. correct answer: Bushing
GIVEN: A plumber is installing the finish plumbing in public accessible men and ladies' toilet facilities that are in a movie
theatre complex. Several types of fixtures and faucets are being used to complete the final connections. Some commercial
fixtures are even designed to be vandal-proof. [Show Less]