Sample Exam Questions Flashcards
1
Q
The relief valve on an RP is discharging intermittently. What is the cause?
A
Pressure fluctuations upstream.
2
Q
A branch is connected downstream of the third water closet fixture drain. What is the minimum size of the branch?
A
4 in.
3
Q
A long straight horizontal run of hot water copper piping is being installed. What is required to prevent damage to piping?
A
Expansion joints.
4
Q
A medical gas system has an in-line high pressure sensor. Where is the sensor located?
A
Downstream of the pressure regulator.
5
Q
An in-line centrifugal well pump has a suction line. What determines the minimum size of the pipe?
A
Size of inlet opening of pump.
6
Q
Which condition applies to a single trap serving multiple shower drains?
A. Pipe size is a minimum of 4 in.
B. All drains are located in the same room.
C. All heads are located on a column shower.
D. All shower drains have an indirect connection.
A
All drains are located in the same room.
7
Q
Given the following information:
- Circuit vent: 1 1/2 in.
- Branch connects 11 water closets
- Additional circuit vent required
Where is the additional circuit vent connected to the branch?
A
Between the fifth and sixth most downstream water closets.
8
Q
Given the following information:
Back-to-back water closets
Roughed-in dimensions: 254 mm (10 in.) from finished walls
Hollow tile partition: 125 mm (5 in.)
Plaster wall finish: 19 mm (3/4 in.)
What is the centre-to-centre distance of the water closet flanges?
A
Metric 671 mm; Imperial 26 1/2 in.
9
Q
When a group of fixtures are wet vented, where is the continuous vent connected?
A
To the highest fixture in the group.
10
Q
A private domestic water system uses a pressure switch for the pump. What is the preset pressure differential on the switch?
A
Metric 138 kPa; Imperial 20 psi
11
Q
Ground conditions prevent the installation of thrust blocks for an underground water service. What is done to restrain the connections?
A
Install continuous rodding.
12
Q
A pipe is offset 1.2 m (4 ft.) using 45° elbows. What is the length of travel?
A
Metric 1.7 m; Imperial 5 ft. 8 in.
13
Q
Coliforms are detected in a potable water system. What equipment is required to treat the water?
A
Chlorine injection system.
14
Q
Which component is required on all DWV systems?
A
3 in. vent to open air.
15
Q
A water closet requires multiple flushes to remove the solids. What is the cause?
A
Refill tube is disconnected from overflow tube.
16
Q
The bypass orifice in a flushometer is partially plugged. What is the result?
A
Long flush cycle.
17
Q
What is the purpose of the diaphragm tank in a hot water system?
A
To accommodate change in volume of water due to expansion.
18
Q
A backflow preventer is being tested. What is the first step?
A
Notify building owner of disruption in water service.
19
Q
18 lb. of ice at 20 °F is converted to steam at 220 °F. How much energy is used?
A
23 472 BTU
20
Q
PEX-A tube is being expanded. What happens when the die of the expansion tool fails to rotate?
A
Troughs are created inside the tube.
21
Q
Which letters do not designate pipe?
XS, S, XXS, or XL?
A
XL
22
Q
A “cistern” is used:
a) in a water supply system
b) in a hot water heating system
c) in a mortuary
d) to collect indirect drainage
A
In a water supply system.
23
Q
A globe valve is used:
a) for on/off throttling
b) for on/off only
c) for throttling only
d) where low head loss is required
A
For on/off throttling
24
Q
In a domestic hot water tank, the ___________ is the anode, and the ________ is the cathode
A
magnesium rod; tank
25
"Galvanic action" is also called:
a) meniscus
b) capillary action
c) rust proofing
d) electrolysis
Electrolysis
26
Pick the largest screw listed below:
a) #6
b) #8
c) #10
d) #12
#12
27
Pick the largest wire listed below:
a) #14
b) #16
c) #18
d) #20
#14
28
What is a left-hand thread on an acetylene fitting is usually indicated by?
The line around the nut
29
When opening a cylinder feeding regulator, you should:
a) open the handwheel quickly
b) open the acetylene cylinder fully, and the oxygen one-quarter turn only
c) never stand in front of the regulator
d) put oil on a sticky valve
Never stand in front of the regulator
30
What is the safety device built into an acetylene cylinder?
A fusible link
31
Before a septic tank can be serviced, it must be assumed for safety that:
a) flammable vapors may be present
b) confined space entry is involved
c) a drowning hazard exists
d) all of the above
All of the above
32
What does the signalman do to stop the hoisting of a load?
Extends one hand out from the waist area, palm down
33
A pipe supported through a clevis hanger from a steel I-beam, would use a_________________ attached to the steel.
a) pre-drilled
b) "C"-clamp
c) perforated strap
d) none of the above
None of the above
34
What is the maximum working pressure of a galvanized schedule 40 pipe?
150 psi
35
If a copper pipe and a galvanized steel pipe must be joined, the fitting must be:
a) a union
b) serviceable
c) exposed
d) dielectric
Dielectric
36
A booster pump on a high-rise building operates when there is:
a) a drop in street pressure
b) high demand on the building system
c) unusually high street pressure
d) no demand on the building system
High demand on the building system
37
Jet systems for wells employ:
a) a venturi
b) a turbine
c) Archimede' s Principle
d) a piston pump
A venturi
38
Excessive vibration and noise are usually an indication that the pump is experiencing...
Cavitation
39
The principle of water sofner operation is:
a) sodium cycle ion exchange
b) filtration
c) sedimentation
d) reverse osmosis
Sodium cycle ion exchange
40
What is the purpose of stadia hairs?
Measure distance
41
One of these is not a characteristic of oxy-acetylene welding flames.
Which one?
a) carbonizing
b) oxidizing
c) neutral
d) impinging
Impinging
42
What is the substance which must be present in an acetylene cylinder?
Acetone
43
Name the type of nipple not (commonly) manufactured:
a) close
b) shoulder
c) 1/2" X 2 1/2"
d) toe
Toe
44
When selecting a hacksaw blade, how many teeth should be in contact with the work?
Three
45
The Propane Storage and Handling Code is:
A. B149.2-00
B. B148.1-00
C. B149.1-00
B149.2-00
45
The most common physical characteristics used to measure the quality of water are temperature, taste, colour, odour, and what?
Turbidity
46
When using grooved pipe from one manufacturer, the fittings from another manufacturer may be used.
True or False?
False
47
A settlement loop is installed in water distribution lines that are ______ inches or less.
2
48
A water purveyor has the primary responsibility of:
A. Ensuring safe removal of sewer waste.
B. Ensuring potable water is handled safely within a consumers residence
C. Providing the public with a safe and potable water supply.
D. Purifying all water sources
Providing the public with a safe and potable water supply.
49
Where would an oil interceptor most likely be found:
A. Commercial Kitchen
B. Laundromat
C. Dry cleaning plant
D. Car Wash
Dry Cleaning Plant
50
A one inch water service to a building may have a _____ valve as the shut-off valve for the building.
Stop-and-drain
51
An air conditioner that discharges 0.05 L/s of condensate into a floor drain, would equate to how many fixture units?
2
52
After the inspection of a hot water heating system shows that the system pressure is in excess of the designed operating pressure. Which device will cause this problem?
Water-feed valve
53
The state in which matter exists can be influence by these two factors:
A. Volume and weight
B. Pressure and weight
C. Temperature and pressure
D. Hot and cold
Temperature and pressure
54
If the zone valve drive motor fails to operate the plumber must:
A. Recalibrate the heat anticipator
B. Add glycol to the system
C. Replace the defective motor
D. Increase the system pressure
Replace the defective motor
55
A 120 Volt hot surface igniter can reach temperatures up to ____°F
2600
56
Which of the following best describes an electric water heater?
A. Direct Fired
B. One with an immersion type element
C. Instantaneous
One with an immersion type element
57
trap arm that does not use siphonic action may change direction in a horizontal plane by up to ____ degrees between the fixture and the vent fitting.
135
58
The suction pipe from the well to the house should be installed at a/an _______ slope.
A. Upward
B. Level
C. Downward
D. Negative
Upward
59
The maximum filling density of any propane container must never exceed ____% of the water capacity stamped on the container
42
60
When installing a private water supply system, a qualified __________ should complete all wiring terminations.
Electrician
61
If a wood range is to be converted to a gas range certain adjustments must be made. One major adjustment is the:
A. Burner control valve must be made inaccessible
B. Replacement of manual dampers with barometric dampers
C. Fact that this can not be done according to code
D. Vent must be increased to a minimum of 6 inches
Replacement of manual dampers with barometric dampers
62
Which of the following describes a pipe wrench?
A. It has serrated jaws
B. Used to grip flat sided objects
C. Used when piping runs are too close together
D. Used for tightening valves and hexagonal items
E. Used on polished and special finished
F. Useful for odd sized nuts
It has serrated jaws
63
Fixtures that are not part of a wet vent group may connect to the wet vent branch and the hydraulic load going into the vent does not have to be included in the wet vent.
True or False?
False
64
When calculating the fixture unit load of a residence a two inch main floor drain is considered to be ____ fixture units
A. 1.5
B. 4
C. 3
D. 2
2
65
The common name for sodium carbonate is _________.
Soda ash
66
Which of the following will have the lowest supply pressure?
A. Propane
B. Manufactured Gas
C. Natural Gas
D. Butane Gas
Manufactured Gas
67
When a series of water treatment devices are required for a water treatment system the water softener is always located _________ in the series.
A. First
B. Immediately after the chlorinator
C. As Convenient
D. Last
Last
68
Which table should be consulted to determine cleanout size and spacing?
A. 2.4.9.3
B. 2.4.7.2
C. 2.1.10.2
D. 2.4.7.1
2.4.7.2
69
Oversizing a boiler could result in
A. A cooling of the controlled space
B. The temperature dropping below the set point
C. Not enough heat for the residence
D. The boiler cycling on and off more frequently
The boiler cycling on and off more frequently
70
A 20 inch high and 32 inch long convector wall unit that has 65 degree Fahrenheit entering air temperature and hot water at 215 degrees Fahrenheit will have a MBH rating of:
7.6
71
A _________ is a device that replaces the pressure tank and pressure switch on a private water supply system.
Mascontrol
72
If 1/2 inch PEX tubing is used in a radiant heating system the manufacture recommends a maximum length of _____ feet. (hint: between 100 and 400)
300
73
Over tightening the bolts on a water closet during installation could result in:
A. The bolts bending
B. The bowl or tank breaking from stress
C. The wax seal not sealing properly
D. Severe difficulty when trying to remove them
The bowl or tank breaking from stress
74
Which of the following best describes a dual check valve backflow preventer?
A. Installed at the spout outlet
B. Used in heating applications where the hazards are minor or moderate
C. Protects from back siphonage and not designed for continuous use
D. Used when a hazard is minor in a residential application
Used when a hazard is minor in a residential application
75
The safety device built into an acetylene cylinder is:
A. A relief valve
B. A fusible link
C. A double-seated valve
D. There are none
A fusible link
76
Gas room heaters installed in hallways in homes for the elderly:
A. May be unvented
B. Must be vented type
C. Should have a projecting flue box
D. Should not have a projecting flue box
Must be vented type
77
How many main categories of check valves are there? (hint: between 2 and 5)
3
78
The Rule Of Thumb (ROT) vent sizing may only be used to determine the vent sizing for:
A) Appliances equipped with draft hoods
B) Fan assisted furnaces
C) Draft hood equipped unit heaters
D) All of the above
All of the above
79
Which of the following best describes a relay coil?
A. When energized it activates contacts to either open or close
B. A device used to isolate instrument transformers
C. A low impedance device used to verify that a mechanical action has been completed
D. An electronic module that transfers input data
A. When energized it activates contacts to either open or close
80
Nominally vertical means an angle not more than _______degrees of the vertical?
45
81
If 800 ft of piping weighs 1000 lbs, how much would 180 ft of piping weigh?
225 lbs
82
One inch medical gas piping that is run vertically must be supported at least every ___ m.
2.4
83
If a pipe wrench fails to operate with normal ratchet like action, it is likely the spring is worn out.
True or False?
True
84
What device is used to measure flue gas temperature?
A. Pyrometer
B. Dragger Tube
C. Draft Tube
D. Micrometer
Pyrometer
85
What is the problem with a thermostat if the heating system cycles too often?
A. There is a break in the wiring to the thermostat
B. Contacts are dirty
C. The wrong voltage thermostat is installed
D. The thermostat is exposed to direct sunlight or a heat source
The thermostat is exposed to direct sunlight or a heat source
86
A double compartment kitchen sink is being replaced with a triple compartment kitchen sink. What drainage changes are necessary to complete the installation?
A. Fixture outlet length cannot be less than 1.2 m
B. The fixture trap and fixture drain is to be one pipe size larger than largest sink outlet
C. The garbage grinder must be installed in the middle compartment
D. Another plumbing trap and vent is required for the extra sink.
The fixture trap and fixture drain is to be one pipe size larger than largest sink outlet
87
Which of the following is the minimum size of a clean-out needed on a 6" sanitary building drainage main clean out?
A. 5 inches
B. 2 inches
C. 6 inches
D. 4 inches
4 inches
88
What is required to activate an electronically controlled water on/off device for a sink?
A. A timer activates the fixture
B. A motion switch turns on the fixture
C. A beam of light is interrupted
D. A user touches the fixture
A beam of light is interrupted
89
If a backwater valve is installed in a building drain, it must be normally open, or normally closed?
Normally Open
90
Water heaters, hose bibs and sill cocks are normally protected from backflow with:
A. An air break
B. An air gap
C. A RPBP
D. A vacuum breaker
A vacuum breaker
91
An aquastat on a hot water system will open when:
A. There is an electrical short circuit
B. High maximum temperature is reached
C. Enough hot water is available
D. Water pressure is too high
High maximum temperature is reached
92
Due to water pressure and sudden changes in water velocity it is imperative that _______ be installed at every point where the water distribution pipe changes direction or elevation.
A. Air relief valves
B. Thrust blocks
C. Flexible seals
D. Asbestos-Cement
Thrust blocks
93
What is a document that outlines all the duties and responsibilities of a particular position?
A. Job Posting
B. Job Description
C. Job Transcript
D. Contract
Job Description
94
Which of the following best describes a fuse?
A. A thermal, non conductive device that opens on voltage fluctuations
B. A device that interrupts current at a certain set value
C. A type of solenoid activated by a temperature sensing device
D. A magnetic coil that monitors motor heating
A device that interrupts current at a certain set value
95
What is the included point angle of a twist drill? (between 90 and 140 degrees)
118 degrees
96
When the floor area is sprinklered, which of the following is not an acceptable way of venting smoke?
A. Openable windows
B. Building exhaust system
C. Fixed glass windows
D. Smoke shafts
Fixed glass windows
97
What minimum depth in mm should drainage pipe be buried?
A. 400
B. 350
C. 300
D. 450
300 mm
98
What is required when installing a deep well jet pump?
A. Foot valve is required on the jet suction line
B. Modulating valve is required on the pump suction line
C. Relief valve is required with centrifugal jet pumps
D. Check valve is required on the pump discharge
Foot valve is required on the jet suction line
99
What piping arrangement would ensure that domestic hot water is readily available to a plumbing fixture?
A. Parallel piping loop on the water system
B. Recirculation line on the water system
C. Mixing valve piped with hot and cold water
Recirculation line on the water system
100
If you found that you have a standing pressure of 7 inches w.c. and an operating pressure of 5.9 inches w.c. then:
A. The regulator needs to be replaced
B. The gas line has been oversized
C. It is acceptable
D. the gas line is undersized
The gas line is undersized
101
The 120 Volt power supply for a humidifier can be supplied by connecting to _______ contacts on the electronic control board.
A. L1 and L2
B. R and G
C. R and Y
D. HTG ACC and COM
HTG ACC and COM
102
A branch with 34 fixture units discharges into a sewage sump. What is the minimum size vent required for the sump? (Between 1 and 4 inches)
3 inches
103
The following device can be used to prevent backflow into a potable water system:
A. Double check valve assembly (DCVA)
B. Reduced pressure principle assembly (RP)
C. Pressure vacuum breaker (PVB)
D. All of the above
All of the above
104
f a kitchen sink in a single family dwelling unit is individually vented it requires a vent pipe that is ____ inches.
A. 2.25
B. 2
C. 1.25
D. 1.5
1.25 inches
105
When using a U-tube meniscus the pressure is measured by:
A. Reading the value on the left side of the meter
B. Reading the value of the right side of the meter
C. Calculating the difference between the levels on either side
D. Calculating the distance from the zero mark to the liquid level
Calculating the difference between the levels on either side
106
When sizing water lines it should be considered that
A. half of the fixtures will be on
B. All the fixtures will be on
C. three quarters of the fixtures will be on
D. Water lines should be sized for 1.5 times the fixture unit total
All the fixtures will be on
107
When performing a hot tapping operation, it is recommended to be prepared to shut down the pressurized piping system, in case an unsafe situation occurs.
True or False?
True
108
An appliance has a high altitude rating for 4500 feet above sea level. For every additional thousand feet above the 4500 feet above sea level the input rating of the appliance must be derated by ______ percent. (between 1 and 10)
109
When installing automatic air vents on a hot water heating system you must make sure that it is:
A. Must be installed so it is inaccessible
B. Located on the highest point in the system
C. Mounted in a horizontal position
D. Directly in line with the water
Located on the highest point in the system
110
When installing gang showers, the showerheads must be ______inches apart.
A. 35
B. 30
C. 45
D. 40
30
111
A roof where people can go and do such things as sun-tanning must have its vent terminal at least _____ metre(s) above the roof.
A. 0.5
B. 1.0
C. 2.0
D. 1.5
2.0
112
An underground water-bearing strata that is capable of yielding a supply of water is the definition of a/an ________
A. Aquifer
B. Submergence
C. Turbidity
D. Annulus
Aquifer
113
What material are the majority of twist drills made from?
A. High speed steel
B. O1 tool steel
C. Ceramics
D. Cubic boron nitride
High speed steel
114
Where would a floor mounted hydronic cooling convector be located in a room?
A. On the wall with the highest heat gain
B. On the floor with the highest heat gain
C. On the wall with the lowest heat gain
D. Near the occupied area of the room
On the wall with the highest heat gain
115
he pressure system of a private water supply system should provide a volume of flow at least equal to:
A. the size of the water pump
B. Two times the peak demand
C. The size of the pressure tank
D. The peak demand
The peak demand
116
At what angle is the point on a centre punch ground?
A. 90 degrees
B. 60 degrees
C. 120 degrees
D. 100 degrees
90 degrees
117
What type of plastic pipe is used for distilled water and de-ionized water systems?
A. Polybutylene
B. Pigmented polypropylene
C. Unpigmented polypropylene
D. Glazed crosslink polyethylene
Unpigmented polypropylene
118
Which of the following best describes the term "rainwater leaders"?
A. A vertical portion of a pipe that comes off the eave trough
B. A device used for checking water flow in a gravity drainage system
C. A vertical rainwater pipe often connected to a downspout
D. An exterior channel installed at the base of a sloped roof to convey storm water
A vertical rainwater pipe often connected to a downspout
119
n propane 2-psi residential system the system regulator must be installed within ____metres of the exterior wall if it is installed outdoors. (between 1 and 4)
1 metre
120
What is the minimum trap size of a bidet?
A. 2"
B. 2.25"
C. 1.5"
D. 1.25"
1.25"
121
Washbasins in a female public washroom should be:
A. Barrier-free accessible in all cases
B. Not visible from the entrance to the room in all cases
C. Provided with shut-off valves installed on the water supply to the fixture
D. Equal to the number of required water closets in the washroom
Provided with shut-off valves installed on the water supply to the fixture
122
As piping in a hot water system drops it is important to install a ______ before the piping drops.
A. Lockshield valve
B. High point vent
C. Zone valve
D. Branch offset
High point vent
123
In some case piping can rise to a sufficient high level to prevent back siphonage. A piping that rises at least 35 feet above the highest fixture it supplies is an example of the:
A. Check valve
B. Barometric loop
C. Area isolation
D. Back siphonage preventer
Barometric loop
124
A multiple-impeller pump design is used to increase the _______ of the water leaving the pump.
A. Velocity
B. Temperature
C. Pressure
D. Flow
Pressure
125
Which meter will be damaged when used on an energized circuit?
A. A voltmeter
B. An ammeter
C. A wattmeter
D. An ohmmeter
An ohmmeter
126
What should you show your employees and clients providing them with peace of mind and confidence in your ability to protect them from infection and disease?
A. Sanitizers
B. Logbook
C. Portfolio
D. Schedule
B. Logbook
127
Which of the following is classified as a severe degree of hazard for cross-connection
A. bathtub
B. Aspirators
C. Heating system
D. Car wash
D. Car wash
128
The destructive disintegration of a metal by electrochemicalmeans is called ___________
A. Corrosion
B. Disinfecting
C. Hardness
D. Fouling
Corrosion
129
A booster pump on a high-rise building operates when there is:
A. A drop in street pressure
B. No demand on the building system
C. Unusually high street pressure
D. High demand on the building system
High demand on the building system
130
A private water supplied cistern is fitted with a 3/4" make-up water pipe supplied by a municipal system. What size air gap would be required?
A. 3/4"
B. 1.5"
C. 1"
D. 2"
1.5"
131
Which is not a hot water heating piping system?
A. two pipe direct return
B. One pipe gravity return
C. Series loop
D. Two pipe reverse return
One pipe gravity return
132
HWT is a common abbreviation for?
Water heater / Hot water tank
133
Which article or subsection of the NPC deals expansion and contraction?
A. 2.3.5
B. 2.3.3.9
C. 2.4.7
D. 2.4.6
2.3.3.9
134
A drain valve should be installed on a meter bypass installation when the service exceeds ___ inch trade size.
A. 2
B. 2.5
C. 3
D. 1
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