Review #1 A + B Flashcards
Stainless steel is an alloy of steel, chrome and
Nickel
Bronze is an alloy of copper and
Tin
Brass is an alloy of copper and
Zinc
Fixtures are required to have
Smooth, corrosion-resistant surfaces
Choose the best answer that defines “vitrified”
A. Hard
B. Smooth
C. Glasslike
D. Rough
C. Glasslike
Which chemical will affect “Pyrex” pipe?
Hydroflouric acid
Pipe dope is applied to pipe threads to primarily
Lubricate and cool the threads when tightening
The name given to a pipe coupling that has bolts running in parallel to the pipe to hold it together
Dresser coupling
When a screwed cast iron fitting is excessively tightened, what will be the most likely result?
Cracked fitting
The inside walls of pipe should be free if burrs and other obstructions in order to
Decrease the resistance to the flow of fluids
If a pressure gauge reads 14.73 psig, what would the absolute pressure be?
29.46 psia
A wrench used to tighten a flat-faced plumbing fitting is called a
Spud wrench
The size of a pipe wrench recommended for use on pipes 1/2” and 3/4” is
12”
The schedule number on a pipe indicates
The wall thickness
Of the black iron pipes listed below, the one with the thinnest wall section would be designated:
A. XH
B. Schedule 80
C. XXS
D. Std
D. Std
When the diameter of a pipe is doubled, it’s capacity to convey liquids increases:
4 times
Which of the following is a non-ferrous metal?
A. Stainless steel
B. Duriron
C. Wrought iron
D. Tin
D. Tin
To prevent black iron from rusting during transit, what protective coating is applied to the pipe?
Lacquer
The letter “W.O.G” stamped on a valve body would mean
Water, oil, gas
If the specification reads “(4) - 1/4” x 2” brass nipples” the length of the nipple is
2”
Which one of the following is not a method of steel pipe manufacture?
A. Butt weld
B. Electro-resistance weld
C. Seamless
D. Victaulic
D. Victaulic
The number of threads per inch for 1/8”, 1/2”, 1 1/2”, and 4” pipe would be
27 TPI, 14 TPI, 11 1/2 TPI, 8 TPI
Which of the following best describes the property that allows a metal to be drawn into a wire?
A. Tenacity
B. Ductility
C. Malleability
D. Conductivity
B. Ductility
Which of the following best describes or indicates the property that resists or keeps the particles of a body from being torn apart?
A. Tenacity
B. Ductility
C. Malleability
D. Conductivity
A. Tenacity
Which if the following best describes the ability of a body to transfer heat or electricity from one particle to another?
A. Tenacity
B. Ductility
C. Malleability
D. Conductivity
D. Conductivity
Which if the following best describes the property that allows a metal to be rolled into sheets of various shapes without breaking or tearing?
A. Tenacity
B. Ductility
C. Malleability
D. Conductivity
C. Malleability
Mercury weighs
13.6 times as much as water
Atmospheric pressure ___ at higher altitudes
Decreases
A magnesium rod installed to be sacrificed to the effects of electrolysis is
An anode
Which if the following metals is lowest on the EMF series?
A. Copper
B. Magnesium
C. Gold
D. Tin
B. Magnesium
Which of the following is not an alloy?
A. Solder
B. Bronze
C. Copper
D. Brass
C. Copper
To produce smooth, accurate threads and to cool and lubricate the dies, thread cutting oil is applied:
During threading
Besides being a safety device, the foot switch used on a power drive is a remote
On-off switch
The first thing to do when servicing a power vise is to
Unplug the power cord
Shaft bearings on a power vise should be lubricated
With grease
If extension cords must be used with power tools, they should have
A 3 prong plug on one end and a 3 pole receptacle on the other end
The pipe is secured in the power vise by the use of
The hand wheel
When hand pipe cutters are used with a power vise:
The vise rotates the pipe and the support bar prevents the cutters from rotating
With a power vise, the only safe hand reamer to use is a:
Fluted reamer
The power threader die head type that does not require reversing is called
Quick opening
A roll groover for pipe ____ remove the burr
Will not
This tool would best be used to centre a vertical pipe rising out of the ground under a sleeve in the first floor slab:
Plumb bob
A universal drive shaft:
A. Is used for threading any and all pipes
B. Normally drives a geared threader
C. Turns the pipe in a stationary threader
D. Connects a power vise to a roll groover
B. Normally drives a geared threader
Grooves for joints in steel pipe can be made by:
Rolling and cutting
Ductility of metal describes its:
Ability to be shaped or drawn out
Standard steel pipe is classified according to size by using the nominal diameter for all sizes from
1/8” up to and including 12”
A standard pipe thread is cut at an angle of
60 degrees
The thread cut on a pipe is known as
Male taper thread
What is the number of threads per inch for an 8” pipe?
8
The threads cut by the “lead” are the ____ ones
Imperfect
At what size does NPS change to OD on mild steel and wrought iron pipes?
14 inch
A spiral reamer should not be used with a
Power vise
When making an end to centre measurement using a threaded fitting, how many allowances must be made in order to cut and thread the pipe?
1
The number of degrees of direction change of a 1/16 bend is
22 1/2
What would you use to support a 4” galvanized steel water pipe extending through more than 2 storeys?
Riser clamp
What would you use to support a 6” horizontal branch installed above ground?
Clevis hangers
To prevent a strap wrench from slipping, you would apply to the strap
Powdered resin
What pressure range of acetylene would you likely be working with during oxy-acetylene welding?
1-5 psi
The resistance to flow in a piping system can be decreased most satisfactorily by
Increasing the pipe size
Which of the following valves would create the most friction losses when fully open?
A. Ball valve
B. Globe valve
C. Gate valve
D. Butterfly valve
B. Globe valve
When using wrenches to tighten a valve onto a pipe, the wrenches would be placed:
One on the pipe and one in the valve on the end the pipe is inserted into
Why is it necessary to ream a pipe before cutting the thread?
If reaming follows threading, the pipe end may split or flare
The pivot point of a lever is known as a
Fulcrum
Fluxes used for brazing have a temperature range of
1100 - 1500 ‘F
An object which floats displaces
More than it’s own weight of water
23” of Hg would be equal to how many inches of water column?
23 x 13.6 = 312.8”
A good flame for oxy-acetylene welding of steel would be
Slightly carbonizing
Galvanized pipe is steel pipe with a coating of
Zinc
95/5 solder would likely contain:
95% tin, 5% antimony
The pressure at the base of a column of water 45 feet high would be:
45 x .433 = 19.49 psi
The formula for calculating specific weight is
Specific Weight = Weight Density of Substance / Weight Density of Water
A cubic foot of water weighs
62.4 lbs
Victaulic couplings are sealed by
Line pressure
The upper portion of a ladder should extend past the point of contact with the roof by
3 ft (1 m)
Which of the following knots is used to tie together two ropes of unequal diameter?
Sheet bend
Compared to a grade of 1/8” per foot, 1% grade is slightly ____
Shallower
1/8” divided by 12 = 0.010417
1/100 = 0.01
The maximum height at which a worker can work above ground before requiring guardrails is
10 ft (3 m)
When required, guardrails shall be placed at
42” above the platform
A ditch that is 4’ 6” deep
A. Requires no shoring
B. Requires shoring
C. Requires sloping of the sides
D. Requires shoring or sloping
D. Requires shoring or sloping
Cast iron water main pipe such as ductile iron is often lined with cement to
Prevent corrosion
The density of a substance is defined as
It’s mass per unit volume
A cross fitting is allowed in a plumbing system to connect
Only vent piping
When using a wrench to tighten chrome-plated piping, what type of wrench would be best suited for this purpose?
Friction or strap wrench
The standard height of the flood level rim of a regular water closet is
16”
The thread used on standard pipe fittings is called
NPT
After tightening a fitting by hand, it is turned by a wrench
Approximately 2 1/2 to 3 turns
A wax seal with an embedded plastic ring is know in the trade as a
“Kant-leak” wax seal
Where a hazardous material is transferred by a piping system, the system must be
Identified
WHMIS legislation covers the responsibility of the employer to provide
Worker education on controlled products
An average thread is cut approximately
12 threads long
What is the number of threads per inch for a 1 1/4” pipe?
11.5
The upper end of every soil-or-waste stack shall terminate in
A stack vent
Practically all pipe threads are ____ hand
Right hand
What is the purpose of the small chain attached to the control valve for a flush tank of a urinal?
To stop noise and splashing
In areas subject to heavy frost conditions, the minimum size of the vent termination serving an individually vented bathtub shall not be less than
3”
The minimum length of lead stub between the underside of the closet flange and the copper ferrule is
3”
Submersible well pumps often have high shutoff heads. To avoid damage to the system components and piping, what can be installed?
A pressure relief valve
If you had to install a lavatory basin or similar fixture with no waste and overflow, how would you guard against possible overfilling of the fixture?
Install a self-closing faucet
When a break occurs in a water main, what is likely to occur within the house piping?
Negative pressure
On the installation of a shampoo basin, what protective device is installed to prevent backsiphonage?
A vacuum breaker
To ensure that bacteria is eliminated in a commercial dishwasher, the final rinse temperature should be no less than
180 ‘F (82 ‘C)
The water supply to a potato peeler is always installed by the use of
An air gap
The minimum size air gap allowable is
1” or 2 times the diameter of the supply pipe
If it was required to have a sink full of water, with hot water running continuously, what device could be used to achieve this?
Install a standing waste
A component of a hydronic system that employs an end switch is a
4-wire zone valve
What would be used to assure trap seal protection?
Trap primer
If the hydraulic load in an S-trap standard was 3 FU, what would the trap size be?
3”
What approximate acetylene and oxygen pressures would you likely use for cutting or 1/4” mild steel?
7 acetylene, 37 oxygen
What would be expected at the base of a riser?
A shut-off valve
What is the maximum distance between cleanouts in a 4” sanitary building drain?
30 m (100 ft)
A shallow well pump is installed directly above a well. What determines the depth to which water can be accessed?
Atmospheric pressure
The effectivenesss of an air chamber depends primarily upon
Volume of air in the chamber
A residential wall-hung toilet would most likely be which bowl type?
Siphon jet or reverse trap with jet
The relief valve piping from a hot water tank shouldn’t be piped directly into a floor drain because
Contamination of the potable water system may occur
A.S.M.E stands for
American Society of Mechanical Engineers
Under similar temperature conditions, the expansion rate of copper pipe is ___ than steel pipe
More than steel pipe
A Durham fitting is used in
Drainage piping
A clinic sink is a hospital fixture that is used for
Rinsing bed pans out
Diatomaceous earth is
Used as a pool filter
According to most fixture rough-in books, a standard wall-hung basin waste pipe rough-in would be closest to
18” AFF
The minimum number and size of planks for a working platform is
2 planks, 2” x 10”
Chlorination will remove
Harmful bacteria from water
Brine is used in which cycle of a water softener?
Regeneration
The brine from a water softener will usually ________ the septic process
Not affect
Too much manganese in water could cause _____ stains on fixtures
Black
The process used to speed up the sedimentation of fine suspended matter in water is called
Flocculation
A catspaw is used in rigging to
Stop a load from see-sawing on a hook
The term zeolite refers to
Softening agent in a water softener
A “bowline on the bight” is tied
In the middle of the rope
A wall through urinal is
Prohibited from installation
A negative pressure in a plumbing drain, waste and vent system can cause a trap to lose its seal by
Siphonage
In plumbing the term “nominally horizontal” refers to a pipe graded to
Less than 45 degree angle with the horizontal
A piston pump is a
Positive displacement pump
A “Douglas Flush Valve” is a name used to describe
An overflow and flapper assembly of a tank type water closet
____ is not considered to be an adequate protection of potable water systems against backsiphonage backflow
Vacuum relief valve
A reverse-acting aquastat used in a hydronic heating system would be used to:
Activate the circulator
The suggested flood level rim height for a wall-hung basin is
31 inches
A “flush elbow” is
The pipe that connects a wall-hung tank to the toilet bowl
The direct flush valve of a water closet should be adjusted to
Adequately flush the bowl using the least amount of water
Marble chips would be used in conjunction with a
Acid interceptor
An oil and gasoline interceptor must have vents connected
At the top at both ends of the sump
The vents for a gasoline and oil interceptor shall terminate directly in open air and
At levels differing by 12” (300 mm)
A pan for a hot water tank must have sides that are at least ____ high
1”
A small hole is located near the top of the dip tube of a hot water tank to prevent:
Siphonage if water from the tank
The dip tube in a hot water tank is located
On the cold inlet
The minimum air gap shall be
1”
Too much iron in water could cause ____ stains on fixtures
Red
A backflow preventer installed on the outlet of a fixture control valve would likely be a
Atmospheric vacuum breaker (janitor sink)
Of the methods used to prevent cross connection contamination, the highest protection provided is usually by the installation of
An air gap
A pressure vacuum breaker will stop backflow caused by
Backsiphonage only
A vacuum relief valve is used to
Relieve a negative pressure in a HWT
A hot water tank must have a shutoff valve located
On the cold water inlet
Indirect (momentum) siphonage of a trap is due to
The operation of other fixtures in the system
A piping material not approved for an interior leader (RWL) is
A. Asbestos cement
B. ABS
C. Sheet metal
D. Copper
C. Sheet metal
A hot water tank, under pressure of 75 psig, has a faulty thermostat and continues to heat. If the T&P relief valve was also stuck in the closed position, the result would be:
The pressure would increase while the temperature rises to more than 212 ‘F
The minimum degree of hardness in water that warrants the installation of softening equipment is:
10.5 to 25 gpg
A heating boiler is being used to heat the house and domestic water as well. The hot water pipe from the coil in the burner would have a
Zone valve installed
What is an activated carbon filter used for?
Taste and odour removal
The operation of diaphragm and piston type flush valves is governed by
Total force
If a reservoir is located 240 feet above the mains in a town, how much pressure would exist in the mains?
104 psi
240 x .433 = 103.92
A customer complains of noise and vibration whenever the hot water faucet is turned on. The probable cause is:
The faucet washer is loose
The maximum allowable cumulative change of direction for a fixture other than one that operates by siphonic action shall not be greater that _____ degrees
135 degrees
