Review #2 A + B Flashcards
An electric hot water tank with immersion elements is considered to be
100 % efficient
(all heat from element is transferred to the water)
An instantaneous hot water heater has a _____ that activates the burner when water is drawn.
Control valve
A baffle is often placed in the flue passage if a centre flue HWT to
Slow the exit of hit combustion gases
Which of the following is not found on a T&P relief valve information tag?
A. Size of valve
B. BTU rating of HWT
C. Pressure setting
D. Sensor length
B. BTU rating of HWT
Stall urinals are installed
During the rough-in stage
A single trap may serve a 3 compartment sink if it is
One size larger than the largest fixture outlet pipe
The copper water service pipe to a building should be
Type K or L soft copper tube
ABS or PVC horizontal piping must be supported at intervals not exceeding
4 feet (1.2 m)
A 1/8 th bend refers to a cast iron fitting used to change direction by
45 degrees
When installing a bypass for a pressure reducing valve, it is best to use a _____ valve
Globe valve
BCuP brazing alloy may be used to join copper tube to copper fittings
A. Only if flux is also used
B. Only if the copper tube is hard drawn
C. Without using flux
D. Without exceeding 800 ‘F
C. Without using flux
The most common cause of the collapse of a hot water tank is
Vacuum
What would be the most correct definition of total force?
A. Total weight of water divided by surface area
B. Weight of water times surface area
C. Weight of water per square inch
D. Pressure divided by surface area
B. Weight of water times surface area
The maximum length of a disposal field lateral, according to the BC Health Act is
100 ft
A pressure tanks main purpose, when used in a rural water supply system, is to
Prevent cycling of the pump
The actual lift of a pump is less than the theoretical lift. This is caused by:
The loss of efficiency due to friction.
The inability of the pump to create a perfect vacuum.
The changes in atmospheric pressure above sea level.
The minimum diameter of a water service is:
3/4”
Threaded drainage fittings installed in a vertical stack are tapped to provide a pitch of ___
1/4” per foot
A combined sewer carries
Sanitary and storm sewage
The maximum fall on a trap arm from the weir to the vent is
1 pipe diameter
The vertical distance between the trap weir and the trap dip is the
Trap seal depth
The developed length of a branch vent shall be
From its upper end to the farthest downstream fixture that it serves
An ordinary displacement type water meter registers
The total flow though the meter
Which of the following meters is two meters in one?
A. Turbine
B. Displacement
C. Oscillating piston
D. Compound
D. Compound
Low flow rate: displacement
High flow rate: turbine
To prevent a load of pipe that is being lifted from swinging:
A tag line is used
The maximum surface temperature that a hot water radiant floor heating panel should not exceed is
80 - 100 ‘F
On a deep well convertible jet pump, the suction line is ____ than the drive line
Larger
An ejector nozzle in a deep well convertible jet pump causes water from the well to flow into the ejector by _____ the pressure in the ejector venturi
Decreasing
The pitless adapter is located in the well casing below ____
The frost line
This control used on a hot water heating system adjusts the boiler water temperature by measuring the outside air temperature
Outdoor reset control
This pipe hanger is best suited to allow pipe movement due to heating and cooling of the pipe
Rolling hanger
This valve can modulate water temperature in a hydronic heating system.
Mixing valve
The material used for medical gas pipelines is
Degreased copper
Which of the following pipes has no “makeup” ?
A. Screwed
B. Socket weld
C. No-hub cast iron
D. Sweat copper
C. No-hub cast iron
Copper tubing sizes are specified by their
Outside diameter
(Tube: inside diameter)
“Sensible heat” is defined as heat required to bring about a change in the
Temperature of matter
A valve that prevents liquids from flowing back into a drainage system is known as a
Backwater valve
In reference to wire rope clips, the “U” bolt portion of the clip must always be placed
On the dead end of the rope
Copper tube used on medical gas systems should arrive on site capped and degreased. If on-site cleaning is required, which chemicals shall be used?
Trisodium phosphate
If a solenoid valve is to operate in a system using liquid, how would the valve close?
Using electric current and a spring
What is the correct way to shorten the flush of a “flushometer” valve?
Turn the needle valve adjusting screw on the body of the flush valve counter-clockwise
The corrosively of water can best be reduced by increasing ____
The pH level
A urinal flush tank uses the following method to effect a flush
Siphonic action
Backsiphonage from a flush valve operated water closet can be prevented by the installation of a vacuum breaker between the
Flush valve and the toilet bowl
Concrete pipe shall not be used
Above ground or inside a building
Polyethylene water pipe shall not be used except for
Water service pipe
Piping, fittings and joints used in pressure sewer, forcemain or sump pump discharge applications shall be capable of withstanding not less than
1 1/2 times the maximum potential pressure
Outlets which cause pressure drops should be provided with regulating valves. The type of valve most likely to be used is
Needle valve
The suction lift that a pump can produce depends upon
The power of the motor
The diameter of the impeller
The speed of the impeller
Atmospheric Pressure
What condition in water does not contribute to corrosion of the piping?
A. Low pH
B. Calcium sulphate
C. Calcium carbonate
D. Sodium chloride
B. Calcium sulphate
The main objective of an air volume control is to maintain the correct
Ratio of water to air in the tank
The weir of the trap is
The highest portion of the inside lower surface of the trap
A lavatory should not be installed in a place that is liable to be used for washing dishes because
Food waste will enter the overflow
The tube through which water flows to refill the flush tank of a water closet discharges near the bottom of the tank primarily to prevent
Noise
A water closet tank has a tendency to drip condensation on the floor year round. This could be caused by
The difference between the ambient temperature of the air and the water in the tank
Excessively high pressure will cause
Noisy flow
A soil-or-waste pipe extending laterally from a soil-or-waste stack and connected at its upstream end to two fixture drains in one storey would be called
A branch
The pressure in a sanitary drainage system should not vary more than
+/- 1 inch water column
The shield on a drinking fountain bubbler serves the following purpose
Prevents contamination of the nozzle
If a SOW stack passes through two storeys and has seven WC draining to it, what is the minimum permissible size of the stack?
4”
Every roof drain shall be securely connected to a leader and provisions shall be made for
Expansion and contraction
The maximum spacing of supports for vertical piping shall be
7.5m (24 ft)
PVC water pipe and fittings shall not be used for
Hot water systems
Polychloroprene flashing for vent pipes shall be a minimum thickness of
2.89 mm
What is the minimum size branch vent for (2) bathroom groups if the vent has a developed length of 7m?
1 1/2”
What is the maximum number of shower heads that may be served by a single shower drain?
6
ABS or PVC are classified as which type of plastic?
Thermoplastic
A relief vent is required under certain conditions when a SOW stack changes direction vertically more than
45 degrees
ABS plastic pipe installed nominally horizontal shall be supported at intervals not exceeding
1.2 m
When a water test is made on the drainage system, the piping shall be kept filled with water for ___ min
15 min
When an air test is made on the potable water system, the system shall withstand an air pressure of 700 kPa for at least ___ min
120 min
The location and grade on a benchmark shown on a site plan denotes the
Base point from which levels are measured
A flow switch may be found in which of the following systems?
Hot water heating
Fire sprinkler
Hose and standpipe
A grease interceptor from a 3 compartment pot sink shall be installed so that it’s vent is not more than _____ away.
2.4 m (8 ft)
What is the process that draws solder into a joint know as?
Capillary action
The type of waste connection that would be utilized when installing a potato peeler is
Indirect connection
Which type of copper tube will withstand the greatest bursting pressure?
Type K
P = H x D
P= pressure in lb/in2
H = height of a column of water in ft
D = density of water per cubic inch
A fixture drain is
A pipe connecting a trap to another part of the drainage system
The theoretical lift of a pump is directly related to
The atmospheric pressure
A pump that is connected to a pressure tank starts and stops frequently. This is probably due to
Waterlogging of the tank
Asbestos-cement pipe is commonly referred to as
White pipe or transit pipe
Drainage piping of 3” diameter and smaller must grade at least
1/4” per foot
The minimum water seal of a ptrap is
1 1/2” (38 mm)
Acid = 50mm
Plumbing drains are designed to run ______ full for adequate airflow
1/2 to 2/3
A “PO” plug stands for
Patented overflow
Developed length means
The distance along the centreline of the piping
The maximum surface temperature that a hot water radiant floor heating panel should not exceed is
80 - 100 ‘F
Nominal pipe size refers to pipe sizes
1/8” to 12” (7-300 mm)
The horizontal piping, including any vertical offset that conducts sewage, clear water waste or storm water to a building sewer is know as
Building drain
The length of a continuous vent is determined by its
Developed length from its connection with a soil-or-waste pipe to where it connects to a stack vent, vent stack, vent header or to open air
The condition that would make it necessary to use a vent header on a plumbing installation would be
2 or more vent stacks
The minimum diameter of individual vent for a 2” trap is
1 1/2”
The minimum protection for cross connection control used on an irrigation system that is directly connected to the water supply system would be
Atmospheric vacuum breaker
Which of the following metals can be classified as ferrous?
A. Copper
B. Lead
C. Cast iron
D. Bronze
C. Cast iron
Which two metals will suffer the most from corrosion due to electrochemical action?
Copper and iron
When you install a mechanical pop-up on a basin, the pullup rod would be best adjusted so it’s knob is
Between 1/4” and 1/2” above the faucet body when the plug is fully open
A 1/2” pipe, threaded correctly, will have an effective thread length of
Approximately 1/2”
Annealing copper tube means to make it ____
Soft
Which of the following is most destructive to both glass and vitrified clay pipe?
A. Chlorinated compounds
B. Hydroflouric acid
C. Hydrochloric acid
D. Nitric acid
B. Hydroflouric acid
Which term means a pipe that connects the waste opening of a fixture to the trap serving the fixture?
Fixture outlet pipe
The application for a plumbing permit accompanied by plumbing drawings shall show a layout of the potable water distribution system including the
Pipe sizes and valves
In a case of conflict between the provisions of the plumbing code and those of a referenced document, the _______ shall govern
Provisions of the code
The highest part of the lower interior surface of a trap
Trap weir
A vent pipe that is connected at its upper end to a vent header it is terminated in outside air and that is used to limit the pressure differential in a SOW stack
Vent stack
A vent pipe that also serves as a soil-or-waste pipe?
Wet vent
What is required when a SOW stack receives discharge from fixtures located on more than 11 stories?
A yoke vent
The trap seal refers to the vertical distance measured from the
Trap weir to the trap dip
Which fixture operates on an intermittent siphon?
Urinal flush tank
A flush valve is commonly installed in place of a flush tank on water closets for commercial and industrial use because
It has more rapid flushing action
A double sanitary tee fitting shall not be used to connect the trap arms of
Back outlet water closets installed back to back
A deep well jet pump with a partially clogged jet would cause
A high vacuum reading in the suction line
When a minus pressure is created in a drainage system by the discharging of another fixture, loss of trap seal occurs by
Momentum siphonage
The minimum design rate of flow in a building sewer is considered to be approximately
Two feet per second
When a shallow well pump starts it reduces _____ in the drop pipe
Atmospheric pressure
The types of copper tubing recommended for a water service is
Type L or K (soft)
Self closing faucets are used essentially to
Prevent waste of water
The water closet bowl that comes in wall outlet type only is
Blowout
The size of an air break shall be
1” or equal to the size of the fixture drain
This backflow preventer is only suitable as protection against backsiphonage
AVB
A vent must terminate no less than ____ above a fresh air inlet
3’ (1 m)
A relief vent is required when more than ____ FU discharge past a circuit-vented branch?
6
A vent stack is required when fixtures drain to a stack that is more than ____ storeys in height
4
Soft temper copper tube shall be supported at intervals not exceeding
2.5m
A die marked as 5/8” NC (national coarse) would be used for threading
Mild steel rod
Which type of water meter would be best suited to an installation with both large peak flows and relatively low flows?
Compound
A standard pipe thread cut is cut at an angle of
60 degrees
A flow switch may be found in which systems?
Hot water heating
Fire sprinkler
Hose and standpipe
Seals of properly vented legal traps may be broken by
Evaporation
The venting of a plumbing system is for the purpose of
Preventing trap siphonage and preventing loss of seal by back pressure
There are two types of wheels on the cutter arms of the internal glass cutter. One is called the cutter wheel and the other is the
Follower
What size pipe wrench is recommended when installing 32 mm (1 1/4”) and 38 mm (1 1/2”) threaded pipe?
46 cm (18”)
Name of the tool used to measure the diameter of a pipe groove?
Pi tape
The maximum distance from the face of a grinding wheel to the tool rest should be
3 mm (1/8”)
A one metre high column of water over a base area of one square metre will exert how much pressure in kPa?
9.81 kPa
What is the minimum height of a guardrail?
1020 mm (40”)
When several ropes are to be attached to a single hook, the connection to the hook is to be made with a
Shackle
How is the mechanical advantage of a hydraulic Jack determined?
By the ratio of the pump piston’s diameter to the lifting piston’s diameter
What is the circulation in a gravity system caused by?
The difference in the water densities in the system
The quantity of heat required to raise or lower the temperature of one pound of water by one degree Fahrenheit
Btu
When is a heating system in “thermal equilibrium” ?
When heat loss equals heat added
What is the maximum water temperature permitted to a bathtub or shower head?
49 ‘C (120 ‘F)
What is the maximum designed flush cycle for a high-efficiency toilet?
4.8 L
