Exam Prep Questions Flashcards
when using Oxy-Fuel cutting and welding equipment, a flashback arrestor protects?
A flame travelling into the hoses
B bright flashes
C electrical shock
D material blowback
A flame travelling into the hoses
What is the definition of a class B fire?
A wood paper trash etc
B flammable liquids (oil)
C electrical fires
D combustible metals
B flammable liquids (oil)
what procedure is used to determine if additional PPE is required for a specific task on a job site?
A ask the site Forman
B complete a hazard assessment
C observe what other workers are wearing
D request information at the next meeting
B complete a hazard assessment
what additional equipment is required at the building end of a PE (polyethylene) water service installation?
A pressure relief filled with a thermal expansion compensator
B pressure reducing valve with bypass
C check valve with diaphragm tank
D testable backflow preventer
C check valve with diaphragm tank
what phase of electricity does a large commercial laundry dryer operate on?
A single phase
B double phase
C triple phase
D quad phase
C triple phase
A water closet seat used in a public washroom must be?
A cover less type
B plastic non permeable type
C Round type
D elongated open front type
D elongated open front type
pressure balanced, or thermostatic mixing valves shall be designed so that the outlet water temperature does not exceed ….
A 39c
B 49c
C 59c
D 99c
B 49c
what is the maximum pressure allowed within a domestic water system before pressure reducing valves are needed?
A 78.9 psi
B 505 KPA
C 550 KPA
D 70.9 psi
C 550 kpa
if four showerheads are installed along a wall, what would the minimum measurement be between the two outermost heads?
A 750mm
B 2.25m
C 1500mm
D 3m
B 2.25m
A backwater valve may be installed in a building drain provided that it is…
A properly vented
B normally open
C 3” or larger
D trapped upstream
B normally open
when a well pump turns on as soon as a faucet is used, the most likely problem is…
A waterlogged pressure tank
B defective pressure switch
C foot valve not holding
D pump impeller is worn out
A waterlogged pressure tank
what material is used in a water softener media tank?
A activated carbon
B salt/brine
C Charcoal
D ion-exchange resin
D ion-exchange resin
A private domestic water system uses a pressure switch for the pump. What is the preset pressure differential on the switch?
A 103 KPA - 15 pis
B 138 KPA - 20 psi
C 207 KPA - 30 psi
D 241KPA - 35 psi
B 138 KPA - 20 psi
The relief valve on a RP is discharging intermittently. What is the cause?
A test valve 4 is leaking
B shut off valve is open
C pressure fluctuations upstream
D expansion of water downstream
C pressure fluctuations upstream
A long straight horizontal run of hot water copper piping is being installed. What is required to prevent damage to the piping?
A isolation valves
B expansion joints
C thermocouple
D insulation
B expansion joints
A medical gas system has a in-line high-pressure sensor. Where is the sensor located?
A downstream of the terminal unit
B upstream of the pressure regulator
C upstream of the main shut off valve
D downstream of the pressure regulator
D downstream of the pressure regulator
The bypass orifice in a flushometer is partially plugged. What is the result?
A short flush cycle
B long flush cycle
C constant flush
D static flush
B long flush cycle
Coliforms are detected in a potable water system. What equipment is required to treat the water?
A media filter
B reverse osmosis system
C chlorine injection system
D manganese green sand filter
C chlorine injection system
which are the minimum required fixtures to be installed in a dwelling unit? (4)
water closet - basin - sink - bathtub
for all fixtures that have a permitted supply pipe size of 3/8” what is the maximum length of the connecter to supply water to the fixture?
A 750mm
B 100mm
C 300mm
D 2000mm
A 750mm
What is the minimum size of the air break if the fixture drain is 3”
3”
What is the minimum size of an air gap?
25mm or 2x the pipe diameter
which device is responsible for turning a well pump on and off?
Pressure switch
The maximum temperature of sewage allowed to discharge is …
A 50c
B 65c
C 70c
D 75c
D 75c
A sewage ejector pit with a 4” inlet requires what size vent?
3”
how would you increase the length of a flush o meter
A turn regulating screw, clockwise
B turn, regulating screw counterclockwise
C remove vacuum break
D throttle the stop valve
B Turn regulating screw counter clockwise
A group of six wall hung carrier water closets are connected to the same horizontal correctly graded soil branch, and the centre of the fittings are all at the same height. How is this made possible?
A by using mounting bolts
B by correctly, adjusting the adjustable extension
C by adjusting the face plate
D by installing carriers at different heights to allow for the correct grade
C by adjusting the face plate
A pressure switch is set for 35 psi cut in and 55 psi cut out. What is the recommended air pressure on the diaphragm tank for best system performance?
A 3 to 5 psi below cut in pressure
B maximum of 55 psi
C minimum of 35 psi
D 3 to 5 psi below cut out pressure
A 3 to 5 PS below cut in pressure
what piping material would be used in a dairy for conveying milk products?
A copper
B glass
C PVC – XFR
D stainless steel
D stainless steel
what colour coating is used for medical air gas labelling?
A green and white
B black and white
C blue and silver
D yellow and silver
B black and white
what is the minimum allowable grade for copper piping which is to be used in a medical gas system?
Type L copper decreased, and cleaned
which valve is best suited for industrial slurry processing application?
A knife gate valve
B solid wedged gate valve
C plug disc globe valve
D compression disc globe valve
A knife gate valve
where does the refrigerant absorb heat in a refrigeration system?
A compressor
B condenser
C expansion valve
D evaporator
D evaporator
what problem is likely to arise when draining and refilling a heating system in an apartment building?
A radiators on the bottom floors, may get airlock
B radiators on the top floor may get air locked
C could cause the boiler to dry fire since there is no water in the system
D the velocity of the water refilling in the system, may cause pipes to freeze and split
B radiators on the top floor may get air locked
A circulating pump is leaking from the bearing assembly. How would one repair such problem?
Replace bearing assembly
what must be considered when positioning a boiler in a mechanical room?
Allow room for access and service
What can be installed to fix an uneven distribution of water in a heating system?
Balancing valve
what is the first action taken when the boiler is firing and no water is in the site glass
Shut off fuel supply to the boiler
At what angle do you bevel pipe before it is to be welded?
37 1/2 *
At what angle do you flare a pipe to when making a flared connection?
45*
when using ABS glue and -15°C, you must do what the glue?
Dilute the glue
A 1/4 bend fitting is also known as a
90
a 1/8 bend fitting is also known as a
45
what is needed in manholes deeper than 1 m?
A corrosion resistant ladder
an “air _______” refers to an indirect connection where a drain line from a fixture or appliance discharges into a receptor below flood level room
Break
what device controls the flow in a in floor heating system?
Balancing valves
if a ladder is extended 40 feet up, how far away from the wall is the base of the ladder?
10’
(4:1)
how far (minimum distance) does dirt/soil need to be from a shored trench or hole
A 2m
B 1.5m
C 1m
D .5m
C 1m
what gives you information on hazardous materials?
A OHSA
B CSA
C MSDS
D WSIB
C MSDS
what gives you information on hazardous materials?
A OHSA
B CSA
C MSDS
D WSIB
C MSDS
four solid ground, at what depth do you require shoring?
A 3’ and deeper
B 4’ and deeper
C 5’ and deeper
D 6’ and deeper
B 4’ and deeper
what is the definition of a class a fire?
fire involving wood, paper, cloth, rubber trash
what is the minimum horizontal distance between showerheads?
750mm
at what height is a thermostat installed?
5 feet
how often should the suspension of a hardhat be replaced?
12 months
What class of hardhat is impact and puncture resistant?
class C
vertical piping must be supported at intervals, not exceeding
A every other story
B every 7.5 m
C every story
D both A and B
D both A and B
The proper torque setting on a MJ coupling is …
A 60lb
B 50lb
C 40lb
D 20lb
A 60lb
What measurement is considered to be standard rough distance for a water closet from finish wall
12”
what is the minimum percentage of oxygen content that is considered to be safe with a confined space?
19.5%
what is the calculation from feet to meters?
x .304
what is the maximum developed length of any fixture outlet pipe?
A 750mm
B 600mm
C 1050mm
D 1200mmm
D 1200mm
What is the maximum allowable vertical fall for a water closet trap arm?
1m
what is the minimum depth of a trap seal required for a laboratory trap?
A 32mm
B 38mm
C 50mm
D 76mm
B 38mm
what is the maximum temperature at which water can discharge directly into a DWV system?
A 68c
B 75c
C 88c
D 91c
75c
what is the minimum size of air brake required for a 1 inch drain pipe serving an indirectly connected appliance?
1”
1 1/2”
2”
3”
1”
what is atmospheric pressure?
14.7 psi
how many BTUs are required to raise the temperature of one imperial gallon of water by 1°F
5 btu
7.5 btu
10 btu
25 btu
10 btu
which type of pump is most suitable for private water supply deep well application?
Piston
Gear
Diaphragm
Jet centrifugal
Jet centrifugal
horizontally run 3/4 type M copper must be supported every
1 m
1.2 m
2.5 m
3 m
2.5 m
Water that is determined to have a pH of 5.5 is considered to be
Mildly acidic
water with the pH level of 8 is considered to be classified as …
2-7 = Acidic (corrosive)
7-12 = Alkaline (erosive)
Sooooo ph of 8 would be slightly alkaline
When a copper tube boiler is fired and begins to heat the water, a loud banging noise and vibration comes from the boiler. What might cause this condition?
A flu gas temperature is too hot
B the copper tubes are calcified and flow is restricted through the boiler
C water is being forced through the exchanger by an oversized circulator
D a faulty check valve within the water feed valve is allowing waterhammer
B the copper tubes are calcified and flow is restricted through the boiler
what is the maximum horizontal offset permitted in a 3” stack that is serving as a wet vent?
2.5m
what is the maximum horizontal offset permitted in a 2“ wet vent ?
1.2m
when sizing a water service and distribution system, which variable will have the greatest effect on the available water pressure to a plumbing fixture?
A length of the building
B height of the building
C total fixture unit load
D number of fixtures
B height of the building
which joining procedure is not proved for copper water service pipe low-grade and under the building?
A flaring the pipe
B compression fittings
C braising the joint
D A B & C are all approved
B compression fittings
(compression fittings can’t be used underground underneath a building)
A shallow well has water within ___ of the pump inlet
10’
20’
25’
30’
25’
a well over 25’ is considered a deep well
moderately hard water is ____ milligrams per litre
0-50
50-100
100-200
200-400
100-200 MG/L
an inspection of a hot water heating system shows that the system pressure is in access of the designed operating pressure. Which device would cause this problem?
Circulator
Water feed valve
Thermostat control unit
Pressure relief valve
Water feed valve
what piping procedure will assist in the removal of air from a hydronic heating system?
A install air vents at all changes of direction
B grade main piping up in the direction of flow
C diaphragm tank to have an automatic air vent
D system mains to use concentric fittings
Grade main piping up the direction flow
where would an in-line flow switch? Be located on a domestic hot water boiler?
A hot water supply line
B hot water return line
C boiler feed
D located immediately after boilers back flow preventer
B hot water return line
Latent Heat of fusion is the amount of heat required for a substance to change from a ….
A gas to a liquid
B liquid to a gas
C solid to a gas
D solid to a liquid
D solid to a liquid
in a steam heating system, the vertical steam supply pipes are called
Risers
Returns
Up feeds
Wet lines
Risers
The most common cause of feeder or low water fuel cut off trouble is the operators failure to observe the …
Blowdown instructions
Fuel calibration sequence
Water treatment limitations
Low water control calibration
Blowdown instructions
if a pump on a heating system sounds like it’s pumping gravel, the most likely problem is
Lack of balance
Worn bearings
Loose couplings
Cavitation
Cavitation
The steam boiler component used to lower the concentration of dissolved impurities in the boiler water is the …
Blow off connection
Concentrator
Feed connection
Settlement reduction valve
Blow off connection
to prevent cross connections from occurring between medical gas cylinders, each gas has connections of specific size to prevent accidental hook up of the wrong gas. What is this system?
A left right nipple connections
B colour-coded stickers
C diameter index safety system
D diameter index sizing system
C diameter index safety system
how is medical gas pipe stored?
A in a locked and secured room
B decreased, capped and on a shelf
C decreased, capped and vertically upright
D just like copper water pipe
C decreased, capped and on a shelf
The term nominally vertical means
A deviation from the true vertical by not less than 45°
B deviation from the true vertical but not more than 45°
C deviation from true vertical by not more than 44°
D deviation from true vertical by not less than 44°
A deviation from true vertical by not less than 45°
an interceptor with an effective water seal of not less than 38 mm may serve as a trap
T or F
T
