Questions Bank pt 2 Flashcards
What is the name of the tool used to remove pits or rough surfaces from valve of faucet seats?
seat dressing tool
Which of the two pipes when used on the same line would react chemically and eventually cause corrosion?
copper and galvanized iron pipes
What type of faucet is now most often used on plumbing fixtures?
compression type
Which of the following supply pipe materials which could resist water hammer and is good for alkaline water?
galvanized pipe
Aside from letting excess water escape below the flood level rim of the fixture, what is the other purpose of the overflow?
protect against self-siphonage
Which of the following plumbing materials is most susceptible to damage from water that contains calcium carbonate?
copper
Which of the water closets is the most efficient, the quietest and the most expensive
siphon action
Approximately how much amount of lead will be poured on a 4” cast iron joint?
4 lbs
A reinforced concrete pipe and vitrified clay pipe are example of a stone based piping. Which of the following is also referred as stone based pipe?
fiberglass pipe
What must bathtubs be provided when recessed into the finished walls?
they must have waterproof joints
What may happen if a cold or damp ladle is plunged into a pot of lead?
the lead will explode
What happens when moist air is trapped in a horizontal vent pipe?
can cause corrosion on the pipe
Which of the non-ferrous pipe material is the most popular material for use in the plumbing system?
copper
Why is that annealed copper should be used for underground installation?
it could handle the stresses and forces an encountered in underground application
Where must a vent pip be connected to a horizontal soil or waste pipe?
above the centerline of the soil or waste pipe
Which of the following gives the correct classification of bends?
by the degree of turn and by diameter of the bend
In what way is a compression joint similar to a slip joint in copper piping?
both use a threaded nut in compression to form a joint
In what condition does the PVC pipe become brittle?
in cold weather
What fitting is used when it is necessary to replace a section of soil pipe or install a fitting into an existing pipeline?
Kafer fitting
When are 1/8 offsets generally used?
used to carry the soil or waste lines past obstruction
Which of the following fitting should not be used within a sanitary installation?
increaser
Combination wye and 1/8 bends are used to make changes of direction of how many degrees?
90 deg.
What is the main reason why the use of brass as a piping material became less popular?
because it contains lead
What is the term used for a tee that enters the straight through section of the fitting on a downward curve?
drainage pattern
Straight tees are used in what section of the DWV system?
vent
What is the greatest advantage of using DWV plastic pipe and fittings for residential sanitary system?
resistance to deposit formation
In sprinkler system, what is the common type of joint used wherein a special coupling is used t o connect the two ends?
rolled joint
This method of joining the pipe is sometimes referred to as a mechanical joint. What type of joint is this?
flanged joint
What is t he minimum size of cast iron soil pipe being manufactured for use in a DWV system?
2”
Both the sanitary cross and straight cross are used in the piping system, however they are not permitted to be used in?
horizontal line piping
What is the system used in correlating the many metal alloys and is indicated in pipes for the identification of the users?
Universal Numbering System
Aside from being used in testing a system for leaks, what is the other use of a test tee?
used as a permanent cleanout
What precaution should be taken when pliers are needed to loosen a chrome swing spout lock nut?
wrap round nuts with adhesive tape to avoid destroying the chrome finish
What characteristics has an oakum in the lead and oakum joint that is lacking in other Joint?
the wet oakum will expand thus making the joint gas and watertight
Which of the following give the correct reason why the DFU value in vent pipe sizing is the same as that of waste pipe sizing?
The amount of air required by plumbing system is proportional to the amount of waste flowing in the drainage pipe
This is often referred to as the starting point of a storm water drainage system?
roof drain
If the projecting walls are opposite from each other, what will be the percentage that will be added to the roof area?
0%
Why do single handle mixing faucets last longer than other types before repairs are being made?
because of fewer contacts between the washer and the seat
When a globe valve does not control the water, what must be done to control it?
the washer might be worn out so it must be replaced
What is the minimum gage number of galvanized sheet metal that could be used as a rainwater downspout or conductor it is to be located on the exterior side of a low height building?
Gage 26
What do you call the process in which all type of iron-based metals rust?
tuberculation
Which pipe support is recommended in holding a single horizontal soil or waste branch?
clevis
What is the science that studies water in motion?
hydraulics
MWSS stands for:
Metropolitan Waterworks and Seweage System
Which of the following is among the types of material pipe support used for vertical application?
metal strap
What type of trap may be used on the house drain immediately before the house
house trap
Originally, solvent system uses what type of material for its drainage, aerator and de-aerator fittings?
copper
What is the color for a pipeline containing gases in either gaseous or liquified form, vapors, and pneumatically conveyed fumes and materials?
safety yellow (ANSI)
It is a copper pipe that can be used in water distribution system above and underground pipe installation
type M
A type of copper tube used for how water heating and low pressure steam sizes up to 32 mm
type M
A type of copper tube used for how water heating and low pressure steam sizes 32 mm and larger
type DWV
A type of copper tube used for hot water heating condensate return lines
type L
A type of copper tube used for chilled water mains sized 32 mm and larger
type DWV
A process of first raising the temperature in separate the more volatile from the volatile part and then cooling and condensing the resulting vapor so as to produce a nearly purified susbstance
distillation
The minimum temperature at which any material gives off in sufficient concentration to form an ignitable mixture
flash point
A kind of stable explosive compound
fulminate
A process where a piece of metal is heated prior to change its share or dimensions
forcing
A cabinet where fire hoses, valves, and other equipment are stored and arranged for firefighting
hose box
Descriptive of any substance that ignites spontaneously when exposed to air
pyrophoric
A passage hack or antechamber between the outer doors and interior parts of a house or building
vestibules
Areas within which only certain types of buildings are permitted to be constructed based on their use or occupancy, type of construction, and resistance to fire
fire zone
It shall not be used for toxic fluids or oxygen, flammable liquids or gases above ground
thermoplastics
Pneumatic test pressure shall not be exceed times design pressure
1.25
It shall not be used above ground in oil or other flammable liquid service nor compressed gas service
cast iron pipe
A highest point in the internal cross-section of the trap at the lowest part of the bend
top dip
Which of the following uses the operating principles of a ball valve?
quick opening valve
What is the SI unit of relative intensity
unitless
The pressure of 1 bar is equivalent to how many Pascals?
100,000
Which of the following is equivalent to a volt?
joule/coulomb
One election volt is equivalent to
1.6 x 10^19 joules
Which of the following is the equivalent to the unit “farad”?
coulomb/ volt
Which of the following is equivalent to the unit “ampere”?
coulomb/ second
Ohm is equivalent to which of the following?
volt/ ampere
What is the unit of luminous flux
lumens
Which of the following is equivalent to the unit “candela”?
lumens/steradian
What is the unit of luminous efficiency?
lumen/watt
What is the unit of illumination?
lux
Lux is equivalent to which combination of units?
lumen/m2
Footcandle is equivalent to which combination of units?
lumen/ft2
How many dynes are there in one Newton?
100,000
What is an elemental unit of energy?
quantum
What refers to the mass which is accelerated at the rate of one foot per second when acted on by a force of one pound?
slug
The size of some bacteria and living cells is in the order of
micrometer
The size of the largest atom is in the order of
nanometer
The mass of grain of salt is in the order of
milligram
Which one is equivalent to the unit “joule”?
Newton-meter
Which one is equivalent to the unit of “watt”?
Newton-meter per second
The “kilowatt-hour” is a unit of
work or energy
The English unit “slug” is a unit of
mass
An electron volt is the energy required by an electron that has been accelerated by a potential difference of how many volts?
1 volt
What is a vector with a magnitude of one and with no unit?
unit vector
What is the purpose of unit vector?
to describe the direction in space
What is another term for a scalar product of two vectors?
dot product
What is another term for vector product of two vectors?
cross product
The scalar product of two perpendicular vector is always
equal to 0
The vector product of two parallel or anti parallel vectors is always
equal to 0
The vector product of any vector with itself is
equal to 0
What refers to physical quantities that are completely specified by just a number and a unit of physical quantities that have magnitudes only?
scalar quantities
What is an arrowed line whose length is proportional to the magnitude of some vector quantity and whose direction is that of the quantity?
vector
The of a moving object is the distance it covers in a time interval divided by the time interval
average speed
The rate at which velocity changes with time is know as
acceleration
“The work done by the net force on a particle equals the change in the particle’s kinetic energy”. This statement is known as
work-energy theorem
The of a particle is equal to the total work that particle can do in the process of being brought to rest
Kinetic Energy
Work is defined as the product of
force & displacement
What is defined as any influence that can change the velocity of an object?
force
