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Certain Study Guide for Plumbing
Terms in this set (86)
When using thread sealing tape to seal a propane pipe thread connection, the tape
A. must be applied to the male threads
A brass fitting that has been annealed has been stress-relieved by
A. being heated, then cooled
The pressure relief valve setting on a propane cylinder is
C. 375 psi
Which of the following materials is not approved for use in a propane gas system
B. type N copper tubing
The most likely cause of propane flow restrictions in copper tubing is,
A. a tubing kink
When sizing the propane system of an RV the maximum developed length of the system needs to be determined. This is always the
A. longest length of piping used
The maximum allowable length of a UL 569 listed flexible hose assembly is
C. 60 inches
In a lock-out-tag-out situation, the lock-out
A. prevents an unintentional release of propane
A propane system is constructed of a copper manifold and riser. The tubing must be secured every _______ feet
When tubing connections are made within a run of iron pipe, the pipe must be secured within _____ inches of tubing connections.
B. 12 inches
The two product listing standards for flexible hose assemblies are
A. UL 569 and UL 21
Flexible hose assemblies are not permitted within a range's burner box because
A. trapped heat within the burner box could melt the hose material
The minimum OD size a copper tube branch line is
B. 3/8 inch
A properly threaded pipe end will contain how many tapered threads?
When copper tubing is flared, it is important to first de-burr the inside and outside of the tube to prevent
B. loose scales
Listed flexible hose connectors are typically used
B. between the DOT cylinders and the propane regulator
An overly long threaded pipe end is not permitted because
B. the pipe will not properly seat within its fitting
Propane lines must be routed in such a way as to prevent
A. physical damage
Copper tubing can be flared properly
D. as a single flare of 45 degrees
Testing the water distribution system can be accomplished with air or water pressure. When using air, why must the water heater be isolated from the system?
A. if ruptured, extensive damage could result
A backflow preventer or check valve may be located at the
A. water pump, city water inlet, water heater
If a check valve has failed at the water heater, it may result in
A. limited hot water at any faucet
The temperature and pressure relief valve on a water heater is limited to a maximum of
A. 210 degrees F and 150 psi
When a water distribution system is leak tested with air pressure only, which of the following statements is false?
D. The water pump must be isolated from the test and not pressurized.
From a user's standpoint, if a water heater bypass kit contained partially opened valves, what would be the likely result?
A. lukewarm water only, at multiple faucets
The maximum pressure a water distribution system should ever be exposed to is
B. 100 psi
A check valve at the city water fill must be replaced if
A. excessive calcium deposits form
A city water fill can be used to fill a non-pressurized storage tank
A. if the tank vent is at least as large as the fill line
When replacing a polyethylene water storage tank, the new tank fitting's mounts may be
A. installed by spin-welding
When winterizing the water distribution system, which statement is false?
D. Fill all tanks with water first to assist in anti-freeze disbursement.
What is the active ingredient used when sanitizing the fresh water system?
D. household bleach
To prevent waste water to fresh water contamination, a potential reality with a shower hose, what is installed to prevent cross contamination?
B. Vacuum breaker
A vent is installed in a fresh water storage tank to
A. release air as the tank fills
A vacuum breaker is typically used?
B. on shower hoses
Which of the following requires a vacuum breaker?
A. exterior shower hose
The minimum drain line size for the gray water holding tank is _____.
B. 1-1/2 inches
Vibrations in water lines may be minimized or eliminated with the addition of
A. an accumulator tank
Regarding water purifiers, which of the following statements is false?
B. They should never be subjected to a pressure greater than 30 psi.
Concerning the fresh water distribution system, an air gap is
C. the space between a faucet outlet and the flood rim of its fixture
A toilet slide valve will not fully close, causing water to continually enter the bowl. A common cause is
A. tissue wedged into the valve seat
When a new sink faucet is installed, what is typically used to seal it to the sink?
B. supplied gasket
Exterior showerheads are usually equipped with a vacuum breaker in order to
C. prohibit cross-contamination
A dripping vacuum breaker is a sign that it is likely
A. functioning correctly
When conducting a flood test, the waste system should be filled with water
C. until it enters the lowest fixture
When flood testing the body waste system, fill with water until water is
B. at the level of the toilet flange
The flood test level of a waste water system should never exceed a height of 18 inches in order to avoid
A. holding tank damage
When conducting the flow test, fixtures are to be filled
C. 1/2 full
A flow test is conducted to check for
A. retarded flow
Two tests performed on the waste drainage system of an RV are
B. flood test and flow test
When considering a repair to any plastic tank, besides the type of material, which of the following is not a consideration?
D. size of the tank
All holding tanks should terminate on the
C. left rear side of the RV or on the rear, left of the center line
When over-exposed to sunlight, that portion of a plastic tank may
When properly connected to a campground sewer inlet, all holding tank termination valves should be
A. kept closed until each tank is ready to be emptied
All holding tanks must
B. be removable
Waste system vent pipes with caps should also be sealed at the ceiling to prevent
A. sewer gases from entering the RV
Every fixture in the RV must have a/an
A. approved trap and vent
An anti-siphon trap vent device cannot be used as a primary vent because it
B. does not allow air out of the system
The maximum number of fullway termination valves permitted on a body waste holding tank is
When a flush toilet is installed in an RV, the minimum size vent pipe for the toilet is
B. 1 1/2 inches
Considering waste system repairs, which statement is not correct?
D. Defer to the RV owner's request, without fail.
When an RV demand pump cycles periodically when there is no demand on the system (faucets are off) this usually indicates _______.
C. a leak is present somewhere in the supply system
The best method for testing a water distribution system for leaks is to _____.
B. perform a pressure drop test using a gauge and water or air pressure
City water connection of an RV with potable water tanks attached to the same water distribution system must have _____.
C. a backflow prevention device installed
The purpose of a vacuum breaker on the inlet of an RV toilet is to _____.
C. prevent siphonage of toilet bowl water into the RV potable water system
When performing a flood test of the gray waste water system, the system should be filled to the _____.
C. flood level of the lowest fixture
The most common method for repairing a hole in an ABS plastic holding tank is ______.
A. plastic patching
The purpose of a P-trap at every fixture drain in a plumbing drainage system is to ______.
C. provide a water seal preventing gases from escaping into the RV
Which of the following is the function of a check valve?
C. Allows for the flow of liquid in only one direction.
Which of the following is not a type of plastic piping used for RV water distribution systems?
When hanging piping, support the piping every ______ feet(centimeters).
B. 4' (121.9)
The typical water pressure created by a demand water pump is _____ psi.
Piping size required to connect the potable water supply to the distribution system is determined by ______.
D. the number of fixtures
Which of the following is the most probable cause of a water pump to periodically run (cycle) when all fixtures are turned off?
C. There is a water leak in the system.
A ______ must be located at any city water service connection if the water distribution system has a non-pressurized water tank and is connected to city water.
C. check valve
What is required to avoid having to fill the entire water heater with antifreeze?
D. Hot water tank bypass kit.
Pick the correct order for components of a flowing fresh water system. (Not all components are listed).
A. Tank, in-line strainer, accumulator, holding tank.
A wet vent is one that ______.
C. may have a sink drain connected to it
ABS and polyethylene holding tanks can be welded.
True or false
Can soft plastic flex tubing be used in a RV drainage system?
B. Only on some small systems.
C. Only when using a portable liquid waste holding tank.
D. Both B and C.
D. Both B and C.
Demand pumps typically produce _________.
A. 40 - 50 PSI
Waste system vents ____________.
A. Allow methane gas to escape the holding tank.
B. Are required on all holding tanks and each fixture.
C. May discharge through the side wall of the RV.
D. All the above.
D. All the above.
An RV holding tank drain outlet must ____________.
A. terminate on the left side of the RV within 22.5 feet of the rear
The type of fittings used for rigid copper piping are __________.
When running waste water piping, secure the piping with hangers ________.
B. spaced every four feet
When full, a forty-gallon tank of water will weigh about ______.
C. 330 pounds
At 40 PSI or more, the typical water pump may draw _______.
A. 3 - 10 amps
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