block D review Flashcards
(175 cards)
1
Q
When the diameter of a pipe doubles, its capacity to convey fluids increases:
Select one:
a.
three times
b.
two times
c.
four times
d.
eight times
A
C
2
Q
Atmospheric pressure:
Select one:
a.
decreases at higher altitudes
b.
is the same everywhere
c.
increases at higher altitudes
d.
is dependent upon temperature
A
A
3
Q
The resistance to flow· in a piping system can be decreased most Satisfactorily by:
Select one:
a.
decreasing the pipe size
b.
decreasing the pressure
c.
increasing the pressure
d.
increasing the pipe size
A
D
4
Q
A column of water 45 feet high would exert a pressure at it’s base of:
Select one:
a.
19.49 PSI
b.
25 PSI
c.
103.68 PSI
d.
90 PSI
A
A
5
Q
In the formula P = H x D, which of the following is not correct?
Select one:
a.
H = Height of a column of water in inches
b.
D = Density of water in pounds per cubic inch
c.
D = Diameter of the container in inches
d.
p =Pressure in pounds per square inch
A
C
6
Q
A 4 inch pipe full of water, 52 feet in height, would produce a pressure at a point 10 feet up from the bottom of the pipe, of approximately:
Select one:
a.
120.1 PSI
b.
22.5 PSI
c.
18.2 PSI
d.
62.4 PSI
A
C
7
Q
What would be the most correct definition of total force?
Select one:
a.
Pressure x Volume
b.
Height x Density
c.
Pressure x Area
d.
Height x Area
A
C
8
Q
If flow through a pipe is to remain unchanged, and the pipe size decreases, the:
Select one:
a.
pressure losses will decrease
b.
velocity will decrease
c.
velocity will increase
d.
velocity will not change
A
C
9
Q
What will the pressure be at the bottom of a storage tank that’s 4 meters high?
Select one:
a.
14.73 kPa
b.
39.2 kPa
c.
1.73 kPa
d.
28.08 kPa
A
Your answer is correct.
10 Kpa per meter
P = H x D
= (4 x 3.28 ) x 0.433
=5.681 psi x 6.895 kpa/psi
= 39.17 kpa
The correct answer is: 39.2 kPa
10
Q
What would be the force against the disc of a 6 inch gate valve operating at 60 PSI ?
Select one:
a.
2,160 pounds
b.
6,786 pounds
c.
1,696 pounds
d.
360 pounds
A
Your answer is incorrect.
Total Force = A x PSI
= 6 sq inch x .7854 x 60 PSI
The correct answer is: 1,696 pounds
11
Q
Which drawings should be referenced when determining the locations for sleeves in concrete floors in high-rise construction?
Select one:
a.
Bench marks on the mechanical drawings
b.
Divisions 22 of the job specifications
c.
Grid-lines on the architectural drawings
d.
Elevations on the detail drawings
A
C
12
Q
What is another way to protect underground piping from separating or moving besides thrust blocks?
Select one:
a.
Restraint Coupling
b.
Insulation
c.
Expansions Joint
d.
Expansion loops
A
A
13
Q
The minimum size of an air gap is:
Select one:
a.
1/2 inch
b.
twice the diameter of the supply outlet
c.
2 inch, or 1 1/2 times the diameter of the supply outlet
d.
1 inch, or at least twice the diameter of the supply outlet
A
D
14
Q
What must be installed at the base of a riser in a commercial building?
Select one:
a.
An identifying label
b.
A drain
c.
A shutoff
d.
.A cleanout
A
C
15
Q
The end of the piping from a T&P relief valve should not extend into a floor drain because :
Select one:
a.
hot water may damage the trap
b.
the velocity of the pipe’s discharge could blow out the trap seal
c.
contamination of the domestic water system could occur through backflow
d.
the pipe could restrict flow into the drain
A
C
16
Q
Vertical water distribution pipes in buildings are referred to as:
Select one:
a.
headers
b.
risers
c.
branches
d.
stacks
A
B
17
Q
The water service to a building may be:
Select one:
a.
Type L soft copper
b.
Type L hard copper
c.
Type K hard copper
d.
Type K or L soft copper
A
D
18
Q
The minimum diameter for a water service is:
Select one:
a.
1/2 inch
b.
5/8 inch
c.
3/4 inch
d.
1 inch
A
C
19
Q
The fixture that imposes the heaviest demand on the water supply system is the:
Select one:
a.
5 public flush tank water closets
b.
5 private water closet flush valves
c.
5 urinal flush valves
d.
5 public water closet flush valves
A
D
20
Q
Polyethylene water pipe shall not be used except for:
Select one:
a.
water service pipe
b.
cold water distribution pipe
c.
basin supply tubes
d.
sleeving
A
A
21
Q
PVC water pipe and fittings shall not be used for:
Select one:
a.
hot water piping
b.
water distribution piping
c.
cold water systems
d.
water service piping
A
A
22
Q
Soft temper copper tube shall be supported at intervals not exceeding:
Select one:
a.
2.75 meters
b.
2.50 meters
c.
3 meters
d.
2.25 meters
A
B
23
Q
The minimum size supply pipe for a urinal equipped with a direct flush valve is:
Select one:
a.
1/2 inch
b.
3/8 inch
c.
1 inch
d.
3/4 inch
A
D
24
Q
Which of the following fixtures must have a shutoff valve on its water supply in a residential occupancy?
Select one:
a.
Water closet
b.
Urinal
c.
Lavatory
d.
Kitchen sink
A
A
25
Which of the following is required on the water supply to a hot water tank?
Select one:
a.
Dual check with an atmospheric port
b.
Shutoff valve
c.
Check valve
d.
Pressure reducing valve
B
26
Every pipe that passes through an exterior wall to supply water to the exterior of the building shall be provided with:
Select one:
a.
a stop-and-waste cock located inside the building
b.
a stop-and-waste cock located outside the building
c.
heat tracing
d.
pressure vacuum breaker
A
27
The minimum size of a supply pipe for a urinal with a self-closing metering valve would be:
Select one:
a.
1 1/4 inch
b.
1/2 inch
c.
1 inch
d.
3/4 inch
B
28
A hot water re-circulation line is required if there is more than:
Select one:
a.
5 stories
b.
4 stories
c.
3 stories
d.
2 stories
B
29
How many fixtures may a manually operated flushing device serve?
Select one:
a.
1
b.
2
c.
4
d.
3
A
30
A water service pipe intended to serve a mobile home shall be terminated
Select one:
a.
above ground
b.
15 inches below ground
c.
24 inches below ground
d.
12 inches below ground
A
31
Which of the following is prohibited to supply non-potable water to?
Select one:
a.
Above Ground Irrigation
b.
Water-Closet
c.
Trap Primer
d.
Urinal
A
32
What is the minimum distance that an atmospheric vacuum breaker may be installed above the flood level rim?
Select one:
a.
25 mm
b.
50 mm
c.
300 mm
d.
150 mm
A
33
Every water service pipe must be able to deliver:
Select one:
a.
100% of the peak demand flow
b.
50% of the peak demand flow
c.
75% of the peak demand flow
d.
25% of the peak demand flow
A
34
A pressure reducing valve is required when the pressure exceeds:
Select one:
a.
80 kPa
b.
1000 kPa
c.
750 kPa
d.
550 kPa
D
35
Water Service Pressure - 375 KPa
Length of cold water line - 27 meters
Loss from the meter - 20 Kpa
Elevation - 2 meters
Pex Piping
KS - 8.3 LPM
LAV - 6 LPM
WC - 6 LPF
CW - 6.8 KG (auto washer)
BT - 1 HEAD
SS- Service Sink
Use PEX pipe and Small Commercial Method ( 2.6.3.1. (2 A ) to size diagram
36
What is the size of "A"?
Select one:
a.
3/4 inch
b.
1/2 inch
c.
5/8 inch
d.
1 inch
A
37
What is the size of "C"?
Select one:
a.
1/2 inch
b.
3/4 inch
c.
1 1/4 inch
d.
1 inch
D
38
What is the size of "D"?
Select one:
a.
1/2 inch
b.
3/4 inch
c.
5/8 inch
d.
1 inch
B
39
What is the size of "G"?
Select one:
a.
1 1/2 inch
b.
2 inch
c.
1 1/4 inch
d.
1 inch
D
40
What is the size of "H"?
Select one:
a.
3/4 inch
b.
1 inch
c.
1 1/4 inch
d.
1 1/2 inch
B
41
The water supply to a potato peeler is always:
Select one:
a.
connected through the side of the abrasive plate
b.
through an air gap
c.
left out - there is no water supply
d.
through the base of the potato peeler
B
42
Which of the following meters is actually two meters in one?
Select one:
a.
Compound
b.
Oscillating piston
c.
Displacement
d.
Turbine
A
43
Backsiphonage from a flush valve-operated water closet can be prevented by the installation of a vacuum breaker:
Select one:
a.
on the pressure side of a flush valve
b.
between the flush valve and toilet bowl
c.
between the control stop and flush valve
d.
between the control stop and system piping
B
44
The purpose of a trap primer is to:
Select one:
a.
add water to the trap
b.
test the backpressure in the stack
c.
prevent siphonage of the trap
d.
equalize the air pressure on either side of the trap seal
A
45
The supply outlet of a fixture must be above the flood level rim to:
Select one:
a.
aerate the water leaving the faucet
b.
prevent water hammer in the system
c.
prevent a cross connection
d.
prevent siphonage of the trap
C
46
The standard horizontal measurement from the center line of a tank-type toilet to the center of the water supply is:
Select one:
a.
6 inches
b.
3 inches
c.
8 inches
d.
4 1/2 inches
A
47
A meter bypass must be installed if the meter is:
Select one:
a.
larger than 1 1/4 inch
b.
larger than 2 inch
c.
larger than 1 inch
d.
larger than 1 1/2 inch
D
48
Which valves would be required for a 2 inch water meter installation?
Select one:
a.
2- shutoff valves, 2- bypass valves, 1.- drain valve
b.
2- shutoff valves
c.
2- shutoff valves, 1 ~ bypass valve, 1 -drain valve
d.
2 - shutoff valves and 1 - bypass valve
C
49
This device is commonly found on a service sink faucet downstream of the control valves :
Select one:
a.
a reduced pressure backflow assembly
b.
a pressure vacuum breaker
c.
an atmospheric vacuum breaker
d.
a double check valve assembly
C
50
The highest level of backflow protection is considered to be:
Select one:
a.
an air gap
b.
a reduced pressure backflow assembly
c.
a pressure vacuum breaker assembly
d.
a double check valve assembly
A
51
Pressure vacuum breakers are effective protection against backflow caused by:
Select one:
a.
backpressure and backsiphonage
b.
backsiphonage
c.
backpressure
d.
thermal expansion of water
B
52
Backflow caused by backpressure of toxic substances into a potable water system shall be prevented by the installation of:
Select one:
a.
a reduced pressure backflow assembly
b.
a double check valve assembly
c.
an atmospheric vacuum breaker
d.
a pressure vacuum breaker assembly
A
53
Backflow prevention assemblies that are installed more than 5 feet above the floor require a:
Select one:
a.
warning sign
b.
permanent platform
c.
permanently fixed ladder
d.
splash guard
B
54
What would be the required backflow protection for the water supply to a cooling tower?
Select one:
a.
Pressure Vacuum Breaker Assembly
b.
Reduced Pressure Backflow Assembly
c.
Double Check Valve Assembly
d.
Atmospheric Vacuum Breaker
B
55
What would be the required backflow protection for the water supply to a marine repair facility?
Select one:
a.
Atmospheric Vacuum Breaker
b.
Double Check Valve Assembly
c.
Pressure Vacuum Breaker Assembly
d.
Reduced Pressure Backflow Assembly
D
56
Which type of check valve is defined as a check valve which has either an internal weight or spring loaded to the extent it will be drip tight in the direction of flow with a 1 PSI differential?
Select one:
a.
Internally loaded check valve
b.
Double Check Valve with Atmospheric Port
c.
Lift check valve
d.
Double Check Valve Assembly
D
57
If a reservoir is located 240 feet above the water mains in a town, approximately how much pressure will be in the main?
Select one:
a.
89 PSI
b.
554 PSI
c.
54 PSI
d.
104 PSI
Your answer is incorrect.
240 Ft x 0.433
The correct answer is: 104 PSI
58
The application for a plumbing permit, accompanied by plumbing drawings, shall show a layout of the potable water distribution system, including the:
Select one:
a.
risers and stops
b.
pipe sizes
c.
pipe sizes and supports
d.
pipe sizes and valves
D
59
What is required on water distribution piping with quick closing valves?
Select one:
a.
Expansion joints
b.
Shock arrestors
c.
Bumpers
d.
Swing joints
B
60
What would be installed below a corporation curb stop to provide support for the valve and the curb cock extension?
Select one:
a.
Thrust block
b.
6 inches of bark mulch
c.
Chair
d.
4 inches of sand
C
61
What is the fixture unit demand on a private water distribution system that is supplying 2 - 6 LPF flush tank water closets, 4 bathtubs and 2 - 8.3 LPM lavatories?
Select one:
a.
13.0
b.
11.4
c.
9.2
d.
12.1
Your answer is correct.
2 x 2.2 = 4.4
4 x 1.4 = 5.6
2 x 0.7 = 1.4
= 11.4
The correct answer is: 11.4
62
Using Table A-2.6.3.1.(2) A, what would be the size of a cold copper water distribution line that is 42 m long with a pressure of 350 kPa, fixture unit load of 70 and with a velocity of 3m/sec?
Select one:
a.
1 inch
b.
1 1/2 inch
c.
3/4 inch
d.
1 1/4 inch
B
63
What would be the size of a PVC water service to a shopping mall that is 64 m long, the water pressure is 427 kPa and the fixture unit load is 90 with velocity flow of 2.4 m/sec? (Use table A.2.6.3.1.(2)-A in the national plumbing code book)
Select one:
a.
1 1/4 inch
b.
2 inch
c.
1 1/2 inch
d.
1 inch
B
64
What is the minimum size water service to a mobile home?
Select one:
a.
1 inch
b.
1/2 inch
c.
3/4 inch
d.
1 1/4 inch
D
65
What is the minimum size for a water supply pipe serving a urinal flush tank?
Select one:
a.
3/4 inch
b.
1/2 inch
c.
1 inch
d.
3/8 inch
D
66
Which piping materials are acceptable for potable water distribution piping?
Select one:
a.
Vitrified clay
b.
Polyolefin
c.
Polyethylene Series 160
d.
Galvanized Steel
D
67
What are the test requirements for a potable water distribution system?
Select one:
a.
An air pressure test of 700 kPa for 2 hours
b.
A water pressure test of 100 PSI for 24 hours
c.
A water pressure test that is equal to 1.5 times the maximum potential pressure
d.
An air pressure test of 100 kPa for 1 hour
A
68
What is typically required on the water distribution piping supplying each floor of a high-rise building?
Select one:
a.
Pressure Reducing Valve
b.
Pressure Relief Valve
c.
Booster Pump
d.
Backwater Valve
A
69
What are the requirements for flushing potable water lines?
Select one:
a.
Cleaned with hydrogen peroxide, then flushed with a 2% chlorine solution
b.
Cleaned then flushed with potable water
c.
Cleaned with a 2% chlorine solution, then flushed with distilled water
d.
Cleaned with a 1% chlorine solution, then flushed with potable water
B
70
If a fixture is located 50 feet above the water main and requires 40 PSI, ignoring friction losses, what would be the required main pressure?
Select one:
a.
8.35 PSI
b.
21.65 PSI
c.
90 PSI
d.
61.65 PSI
D
71
When is a pressure reducing valve required on a water distribution main serving a single-family dwelling?
Select one:
a.
When the pressure exceeds 100 PSI
b.
When the pressure exceeds 80 PSI
c.
When the piping diameter exceeds 3/4 inch
d.
Always
B
72
When is it permissible to install Series 160 Polyethylene water piping?
Select one:
a.
Hot water distribution lines
b.
Water service lines above ground
c.
Cold water distribution lines
d.
Water service lines below ground
D
73
What methods could be used to prevent a water service line from freezing?
Select one:
a.
Heat trace
b.
Insulate the water service
c.
Install below the frost level
d.
Any of the options
D
74
What type of backflow preventer would be used for a direct flush valve?
Select one:
a.
AVB
b.
Dual Check
c.
DCVA
d.
PVBA
A
75
What would be the size of the bypass around a 2 inch water meter if the main line supply to the meter is 4 inch and supplies the fire protection system?
Select one:
a.
4 inch
b.
3 inch
c.
2 inch
d.
1 1/2 inch
A
76
What valves would be needed on the bypass line around a PRV ?
Select one:
a.
Globe valves on both sides of the PRV and a ball valve on the bypass
b.
Butterfly valves on both sides of the PRV and a gate valve on the bypass
c.
Gate valves on both sides of PRV and a globe valve on the bypass
d.
Ball valves on· both sides of the PRV and a diaphragm valve on the bypass
c
77
Where are shutoff valves required for a water distribution system installed within a shopping mall?
Select one:
a.
On the water supply to each store
b.
On the water supply to water closets and kitchen sinks
c.
On all fixture supplies
d.
On the water supply to water closets, hot water tanks and lawn services
C
78
What type of backflow preventer would be used on the make-up water line supplying a boiler with 50% glycol?
Select one:
a.
AVB
b.
PVBA
c.
DCVA
d.
RPBA
D
79
What type of backflow preventer consists of two single check valves and a single port open to atmosphere?
Select one:
a.
AVB
b.
DCAP
c.
DCVA
d.
PVBA
B
80
Which type of backflow preventer would be installed in the make-up water line to a chiller having chemical treatment?
Select one:
a.
AVB
b.
DCVA
c.
RPBA
d.
PVBA
C
81
If a one inch diameter water line is being used to fill a tank, what would the minimum air gap separation be?
Select one:
a.
25 mm
b.
100 mm
c.
75 mm
d.
50 mm
D
82
What is the maximum height above the floor that an RPBA may be installed?
Select one:
a.
Five feet
b.
Three feet
c.
Ten feet
d.
One foot
A
83
Normally, there are 2 pipes running to a deep well jet assembly; one is a 1 1/4 inch suction line and the other is a:
Select one:
a.
1 inch drive line
b.
1 inch discharge line
c.
1 1/4 inch discharge line
d.
1 1/2 inch drive line
A
84
A shallow well pump is installed directly above a well. What determines the maximum height above the well at which the pump can be located?
Select one:
a.
Horsepower of the pump
b.
Atmospheric pressure
c.
Size of the. suction piping
d.
Pressure ·tank location
b
85
A piston pump:
Select one:
a.
uses an impeller for its operation
b.
doesn't require a P.ressure relief valve
c.
uses a gear for its operation
d.
is a positive displacement pump
D
86
A pitless adapter is used in conjunction with a well pump's service line to prevent:
Select one:
a.
the pump from freezing
b.
the pump from becoming air-locked
c.
the service line from freezing
d.
the well casing from becoming air-locked
C
87
The pitless adapter is located:
Select one:
a.
above the well casing
b.
in the well casing below the frost line
c.
in the well casing below the static water level
d.
in the well casing below the injector
B
88
The main objective of an air volume control is:
Select one:
a.
to activate the pump motor when all air is exhausted from the tank
b.
to maintain the proper amount of water in the pressure tank
c.
to maintain the correct amount of pressure in the system
d.
to maintain the proper amount of air in the pressure tank
D
89
A fixture, requiring 103 kPa to operate, is located 5 meters above the pneumatic tank and pump. If 30 kPa will be lost to friction, what should the minimum switch setting be?
Select one:
a.
166 kPa
b.
286 kPa
c.
183 kPa
d.
146 kPa
Your answer is correct.
103 kpa + 50 + 30
= 183 kpa
The correct answer is: 183 kPa
90
On a domestic pneumatic water system, the normal "cut-in" and "cut-out" pressures would be:
Select one:
a.
30 PSI and 50 PSI
b.
20 PSI and 50 PSI
c.
25 PSI and 50 PSI
d.
15 PSI and 35 PSI
Your answer is correct.
20 PSI Difference
The correct answer is: 30 PSI and 50 PSI
91
"Booster" pumps used on high-rise buildings are most commonly:
Select one:
a.
centrifugal
b.
helical rotary
c.
reciprocating
d.
submersible
A
92
The practical suction lift of a shallow well pump at sea level is approximately:
Select one:
a.
16 to 20 feet
b.
28 to 34 feet
c.
20 to 25 feet
d.
24 to 30 feet
C
93
Which of the following pumps require a relief valve on the discharge side?
Select one:
a.
Centrifugal pump
b.
Shallow well jet .pump
c.
Gear pump
d.
Deep well jet pump
C
94
The pressure in a pneumatic water supply system is controlled by:
Select one:
a.
an air compressor
b.
an aquastat
c.
a pressure switch
d.
the air volume control
C
95
A booster pump on a high-rise building operates:
Select one:
a.
when the street pressure surges
b.
when there is no demand on the building water system
c.
when there is insufficient street pressure to operate building water system
d.
when there is high demand on the building water system
C
96
What device is used on· the outlet of two-pipe jet pumps to allow the pump to produce the most water possible?
Select one:
a.
A full-sized barbed fitting
b.
A concentric reducer to increase outlet pipe size
c.
A pressure tank
d.
A flow-control fitting or valve
D
97
The pressure at the discharge of a submersible pump is directly related to the
Select one:
a.
jet assemblies
b.
impellers
c.
foot valves
d.
conductors
B
98
What piece of equipment is typically installed when booster pumps are used in the water distribution piping of a high-rise?
Select one:
a.
T and P relief valves
b.
Check Valves
c.
Pressure Reducing Valves
d.
Water Hammer Arrestors
C
99
Which safety device would be installed on the discharge side of a piston pump and never installed on the inlet side of the pump?
Select one:
a.
Pressure relief valve
b.
Vacuum relief valve
c.
Strainer
d.
Check valve
A
100
How is polyethylene water service pipe connected to the discharge side of a jet pump?
Select one:
a.
Two gear clamps in direction of pump rotation
b.
One gear clamp in direction of pump rotation
c.
Two gear clamps in opposite directions
d.
An MJ clamp
C
101
How should a 500 foot deep submersible pump be supported?
Select one:
a.
A cable from the pump to the cap
b.
It may be supported by the pitless adapter
c.
A cable from the horizontal piping to a beam
d.
A cable from the horizontal piping to the casing
A
102
What determines the size of the suction pipe for a shallow well jet pump?
Select one:
a.
The size of the suction inlet to the pump
b.
The distance from the pump to the pumping level of the water
c.
The elevation of the discharge piping
d.
The size of the discharge outlet from the pump
B
103
Where is the jet assembly located for a deep well jet pump?
Select one:
a.
5 feet above the water level
b.
5 feet from the bottom of the well
c.
Adjacent to the pump inlet
d.
5 feet below the water level
D
104
At what pressure should a diaphragm pressure tank be pre-charged to?
Select one:
a.
2-3 PSI above the cut-in pressure
b.
2-3 PSI below the cut-in pressure
c.
2-3 PSI below the cut-out pressure
d.
2-3 PSI above the cut-out pressure
B
105
When bypassing a pressure reducing valve, it is advisable to use a/an:
Select one:
a.
plug valve
b.
O.S.&Y. valve
c.
gate valve
d.
globe valve
D
106
what is the minimum distance that a flow meter should be installed upstream of another fitting?
Select one:
a.
At least 15 pipe diameters
b.
At least 1 pipe diameter
c.
At least 10 pipe diameters
d.
At least 5 pipe diameters
D
107
In addition to the dials for billing purposes, a water meter has another dial commonly called a test dial. What is its purpose?
Select one:
a.
To measure velocity
b.
To check for leaks and To check water consumption of fixtures
c.
To check water consumption of fixtures
d.
To check for leaks
B
108
What may be installed at changes of direction in underground water mains to prevent damage due to water velocity?
Select one:
a.
Expansion joints
b.
Thrust blocks
c.
Cushion tanks
d.
Water hammer arrestors
B
109
What would be the minimum backflow protection required on the water supply for a 150 MBH hot water boiler without chemicals in the system?
Select one:
a.
PVBA
b.
DCVA
c.
DCAP
d.
RPBA
C
110
Which valves would be required for a 2 inch water meter installation?
Select one:
a.
2 -shut-off valves
b.
2 -shut-off valves, 2- bypass valves, 1 - drain valve
c.
2- shut-off valves, 1 -bypass valve, 1 -drain valve
d.
2 - shut-off valves and 1 - bypass valve
C
111
If the potable water supply is found to have small amounts of corrosive characteristics, water treatment may be as straight forward as?
Select one:
a.
Adjusting the PH level
b.
Adding a neutralizing tank
c.
Increasing levels of chlorine
d.
Installing a backflow preventer
A
112
In what type of application would require the installation of a post indicating valve?
Select one:
a.
Water line supplying a laboratory
b.
In irrigation systems supplied from a well
c.
Service line supplying a steam plant
d.
When an automatic (fire protection) sprinkler shut-off valves are installed below ground
D
113
When filling a new water main during the disinfection and flushing procedures, what is the minimum recommended protection on the fire hydrant water line to prevent water from entering the public supply?
Select one:
a.
DuC
b.
DCVA
c.
RPDA
d.
RPBA
B
114
A type of fire hydrant equipped with a drain port located below ground to prevent from freezing after the valve is closed?
Select one:
a.
Wet barrel
b.
Hydrostatic barrel
c.
Deluge barrel
d.
Dry barrel
D
115
If you show up to a service call, and the RPBA is continuously dumping water out of the relief valve. But when you close the #2 shutoff valve, water still continues to dump out of the relief valve. What is most likely the problem?
Select one:
a.
Number 1 check valve is faulty
b.
RPBA is subject to bad pressure
c.
System pressure is too high
d.
Number 2 check valve is faulty
A
116
Sizing a service line for a single family dwelling unit that has 42 fu's and velocity of 3 m/s using the simplified table, what would be the size of the copper service line?
Select one:
a.
1 inch
b.
3/4 inch
c.
1 1/4 inch
d.
1/2 inch
A
117
On a partial flow through sprinkler system, what is the minimum form of backflow protection required?
Select one:
a.
No protection required
b.
DuC
c.
DCVA
d.
DCAP
B
118
Which location is not permitted to install a pressurized grey water pipe?
Select one:
a.
Near a hot water tank
b.
Next to a pool
c.
Above a covered pressurized potable water tank
d.
Under a storm sewer
C
119
What is a common color used to identify non-potable piping?
Select one:
a.
Green
b.
Purple
c.
Red
d.
Orange
B
120
A homeowner is complaining that the water pressure is too high in their house. When you connect a pressure gauge to the system the gauge reads 600kpa. How could you correct this problem?
Select one:
a.
Install an air admittance valve
b.
Install a hammer arrestor
c.
Adjust the PRV counter clockwise
d.
Adjust the PRV clockwise
C
121
If the diameter of a hot water tank is 600mm, what would be the minimum size of the drain pan in accordance to the NPC?
Select one:
a.
625mm
b.
650mm
c.
750mm
d.
700mm
B
122
Using the small commercial (small building) method, what is the maximum hydraulic load on a 1 inch service line that is 62m long, has a velocity of 2.4m/sec and the pressure available is 350kpa?
Select one:
a.
17 fixture units
b.
84 fixture units
c.
23 fixture units
d.
29 fixture units
C
123
When it is required to install an expansion tank on a domestic water system, where is the most common location for the expansion tank?
Select one:
a.
Hot line leaving the HWT
b.
On the service line
c.
Cold line upstream of the HWT shut-off
d.
Cold line downstream of the HWT shut-off
D
124
On a tankless water heater used in a domestic application, what is used as a temperature measuring device?
Select one:
a.
Thermostatic Mixing Valve
b.
Thermistor
c.
Aqua-Stat
d.
Temperature Relief Valve
B
125
Calculate the total BTUH (output) if the flow rate is 12.5 GPM and the temperature change is 20F?
Select one:
a.
250 BTUH
b.
250,000 BTUH
c.
125,000 BTUH
d.
15,000 BTUH
C
126
Where is the Jet assembly (ejector) located on a shallow well centrifugal jet pump?
Select one:
a.
Flow control valve
b.
Discharge pipe on the pump
c.
Suction pipe on the pump
d.
Suction pipe in the well
C
127
When installing domestic water to a fountain machine for soda pop, which type of piping is typically installed downstream of the back flow preventor?
Select one:
a.
Brass
b.
Copper
c.
Plastic
d.
Steel
C
128
What type of back flow protection is required on a water supply going to a system with carbonated beverages?
Select one:
a.
DuC
b.
DCAP
c.
AVB
d.
DCAPC
D
129
Which type of material is not permitted to be installed for fixture drains or vents below the flood level rim of a flush-valve operated urinal?
Select one:
a.
ABS
b.
Type DWV Copper
c.
System 15
d.
Cast Iron
B
130
What would be the minimum size of air gap for a 3/4 inch supply outlet?
Select one:
a.
3/4 inch
b.
1 1/2 inch
c.
3/8 inch
d.
1 inch
B
131
In a typical residential application, what is the most common form of back flow protection on the domestic water lines?
Select one:
a.
RPBA
b.
Air Break
c.
DuC
d.
DCVA
C
132
When your piping to a newly installed ice machine with a 3/4 inch drain line, what's the minimum air break the drain line terminate above the in-direct connection?
Select one:
a.
3/4 inch
b.
2 inch
c.
1 1/2 inch
d.
1 inch
D
133
Who must be notified before shutting off the domestic water in an apartment building?
Select one:
a.
Field Safety Representative
b.
Owner Representative
c.
Water Purveyor
d.
Residence
B
134
The most common method of lining a well is to insert a pre-formed casing made of plastic or steel. Which type of well inserts the casing after the well has been created?
Select one:
a.
Jetted Well
b.
Drilled Well
c.
Bored Well
d.
Driven Well
B
135
Which of the following backflow preventers would be the minimum requirement for premise isolation protecting a building that is a moderate hazard?
Select one:
a.
RPBA
b.
DCAP
c.
PVBA
d.
DCVA
D
136
When troubleshooting a submersible pump, what is the probable cause if there is a low supply or no water when the pump is running?
Select one:
a.
Air Lock
b.
Loss of Prime
c.
Blown Fuse
d.
Leak in Pressure Tank
A
137
If you are servicing a Jet Pump that was running fine previously and the pump will not shut off, what could be the problem?
Select one:
a.
Defective wiring
b.
Air bound pressure tank
c.
Inadequate Priming
d.
Pressure switch tubing is plugged
D
138
When it is required by a plumber to check the amperage draw from a pump to determine if the pump is in the acceptable range of the manufacture, which of the following statements are true?
Select one:
a.
Make sure the pump is turned off, then use a clamp-on ammeter around a single conductor
b.
Make sure the pump is running and use a clamp-on ammeter around a single conductor
c.
Make sure the pump is turned off and use a clamp-on ammeter around all the conductors
d.
Make sure the pump is running and use a clamp-on ammeter around all the conductors
B
139
Where is the best location to install a torque arrestor on a submersible pump?
Select one:
a.
On the Well cap
b.
On the Pit Less adaptor
c.
On Discharge side of the pump
d.
On the motor
C
140
What should be done to a water meter and its piping just prior to installation in an existing potable water system ?
Select one:
a.
Locked out and tagged
b.
Disinfected and flushed
c.
Insulated and heat taped
d.
Pressure tested and calibrated
B
141
How is the domestic water temperature maintained in the upper floors of a 6 storey building ?
Select one:
a.
Pressure balancing valves
b.
Gravity circulation
c.
Booster pumps
d.
A re-circulation line
D
142
What is the best way to increase the volume of water flow through a existing distribution system ?
Select one:
a.
Decrease the pipe size
b.
Decrease the pressure
c.
Increase the pressure
d.
Increase the pipe size
C
143
What may be required to be installed on long water lines within a high-rise building ?
Select one:
a.
Sacrificial anodes
b.
Expansion Joints
c.
Quick closing valves
d.
Di-electric fittings
B
144
Where is the best location to take a water sample from a pumped well system ?
Select one:
a.
The first available hose bib
b.
The furthest outlet to the pump
c.
The closest outlet to the pump
d.
The cold water inlet to the hot water tank
C
145
If a new water distribution system has been installed and cleaned and you notice that the water smells like chlorine, what should be done ?
Select one:
a.
Flush the system again
b.
Install a reverse osmosis water filtration unit
c.
Install a chlorine dilution tank
d.
Inform the plumbing inspector
A
146
When are you required to test an RPBA ?
Select one:
a.
Weekly
b.
Every 5 years
c.
Annually
d.
Monthly
C
147
The purpose for installing the lint catcher upstream of a swimming pool pump is to prevent the :
Select one:
a.
Impeller from clogging due to hair and lint
b.
Excessive cleaning of the filter media
c.
Heat exchanger from becoming plugged in the boiler
d.
Injector from becoming plugged on the chemical feeder
A
148
Why are centrifugal pump suction lines installed with positive grade from the well to the pump inlet ?
Select one:
a.
To allow water from the pump to drain back to the well to prevent freezing
b.
To keep positive pressure on the foot valve to ensure it will stay closed
c.
For better air elimination when priming
d.
To provide laminar flow to the inlet of the pump
C
149
If the jet assembly in a deep well jet pump system must be lowered , what must also be done ?
Select one:
a.
Re-adjust the pressure switch
b.
Re-adjust the control valve
c.
Change the foot valve
d.
Change the pre-charge pressure in the pressure tank
B
150
What is the effect of high temperature , soft water on copper water lines ?
Select one:
a.
The rate of corrosion is reduced
b.
There are no adverse effects
c.
The rate of corrosion is increased
d.
The rate of scaling is reduced
C
151
An existing 2 1/2-inch I.D pipe is to be replaced by two pipes equal in size, and they must provide at least as much flow (ignoring friction loss). What is the smallest size able to do the job?
Select one:
a.
1 1/4 inch diameter
b.
2 inch diameter
c.
1 inch diameter
d.
1 1/2 diameter
B
152
Excessively high pressure will cause :
Select one:
a.
Quiescent flow
b.
Streamline flow
c.
Noisy Flow
d.
Laminar flow
C
153
To increase the outlet pressure from a pressure reducing valve , the plumber would :
Select one:
a.
Change the diaphragm
b.
Change the diaphragm spring size
c.
Turn the adjusting screw counter-clockwise
d.
Turn the adjusting screw clockwise
D
154
What is the most common type of gauge used to verify the operation of back-flow assemblies ?
Select one:
a.
Differential gauge
b.
Helical Gauge
c.
Duplex gauge
d.
Bourdon Tube gauge
A
155
If a pneumatic tank is undersized for a potable water system :
Select one:
a.
the pump will cycle too often
b.
the relief valve will discharge
c.
flow rates will be reduced
d.
the pump will lose prime
a
156
A pump with a pressure tank starts and stop frequently. This is probably due to :
Select one:
a.
an undersized pump
b.
too much pressure in the tank
c.
too little pressure in the tank
d.
water-logging of the tank
D
157
Vibration in a base mounted pump is most commonly caused by :
Select one:
a.
misalignment between motor and pump shafts
b.
power surges
c.
fluctuating water pressure
d.
fluctuating water temperature
A
158
Air is spurting around the rod of a reciprocating pump. The problem is likely that :
Select one:
a.
the piston is loose
b.
the pump is producing too much pressure
c.
the pump is air locked
d.
the rod packing is leaking
D
159
Excessive vibration and noise are usually an indication that the pump:
Select one:
a.
is undersized for the system demands
b.
is jammed
c.
is experiencing cavitation
d.
has broken it's coupler
C
160
To replace a faulty spring "coupler" on a dry -rotor circulator :
Select one:
a.
drain system , disconnect power , remove set screw and pull motor
b.
disconnect power , remove set screw pull motor
c.
disconnect power , loosen set screw , remove bolts and pull motor
d.
drain system , disconnect power , loosen set screw , remove bolts and pull motor
C
161
What must be checked after a pump is installed in a hot water heating system ?
Select one:
a.
Rotation of the pump
b.
Pressure rating of the pump
c.
Capacity of the pump
d.
Voltage rating of the pump
A
162
What part would need replacement if a pump was leaking between the motor shaft and the pump body ?
Select one:
a.
Mechanical seal
b.
Impeller
c.
Motor shaft
d.
Spring coupler
A
163
If you had a waterlogged galvanized conventional expansion tank, how would you fix the problem?
Select one:
a.
Close the isolation valve, remove the tank, drain, re-install the tank, open the isolation valve.
b.
Close the isolation valve, open the air inlet valve, attach a compressor hose, pressurize to manufacturer's settings, close the air inlet, open the isolation valve.
c.
Open the air inlet valve, close the isolation valve, open then drain valve, allowing air to enter and water to drain. Close the drain valve, open the isolation valve, close the air inlet valve.
d.
Close the isolation valve, open the air inlet valve, open the drain valve, allow water to drain and air to enter, close the drain valve, close the air inlet valve, open the isolation valve.
D
164
Which valve would have to be closed if there was a leak in the water service between the city water main and the property line?
Select one:
a.
Curb stop
b.
Main stop and drain
c.
City gate valve
d.
Corporation stop
D
165
What safety device is installed in an electrical circuit to prevent excessive amperage draw from a pump?
Select one:
a.
Circuit breaker
b.
Single pole single throw (SPST) switch
c.
Rheostat
d.
Double pole double throw (DPDT) switch
A
166
What is the most likely cause of low production (flow) from an existing jet pump ?
Select one:
a.
An undersized suction line
b.
A leak has developed in the suction line
c.
An undersized pump
d.
An undersized discharge line
B
167
What would be the result of a leaky foot valve on a jet pump installation?
Select one:
a.
Low pressure in discharge line
b.
Loss of prime for pump
c.
Intermittent relief valve discharging
d.
Low production from pump
B
168
Which of the following tests could be used to determine if a re-circulation pump is experiencing cavitation?
Select one:
a.
Heat of the pump motor
b.
Pressure difference between the inlet and the outlet
c.
Temperature difference between the inlet and the outlet
d.
Voltage
B
169
Use copper pipe:
Velocity - 2.4 m/s for COLD
Velocity - 1.5 m/s for HOT
Size as per table - A-2.6.3.1.(2)-A
170
What is the size of pipe N
a.
1/2"
b.
3/4"
c.
5/8"
d.
1"
C
171
What is the load and size of pipe "T"?
a.
14.8 - 1"
b.
14.8 - 3/4"
c.
10.8 - 3/4"
d.
10.8 - 1"
A
172
What is the size of pipe "P"?
a.
3/4"
b.
1 1/2"
c.
1 1/4"
d.
1"
A
173
What is the size of pipe "Q"?
a.
1"
b.
2"
c.
1 1/2"
d.
1 1/4"
C
174
What is the load and size of pipe "E"?
a.
172.2 - 1 1/2"
b.
180 - 2"
c.
172.2 - 2"
d.
180 - 1 1/2"
B
175
What is the load and size of pipe "O"?
a.
40 - 1 1/2"
b.
40 - 1 1/4"
c.
31 - 1 1/2"
d.
36 - 1 1/2"
A
