Review #2 A + B Flashcards
(143 cards)
1
Q
An electric hot water tank with immersion elements is considered to be
A
100 % efficient
(all heat from element is transferred to the water)
2
Q
An instantaneous hot water heater has a _____ that activates the burner when water is drawn.
A
Control valve
3
Q
A baffle is often placed in the flue passage if a centre flue HWT to
A
Slow the exit of hit combustion gases
4
Q
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
A
B. BTU rating of HWT
5
Q
Stall urinals are installed
A
During the rough-in stage
6
Q
A single trap may serve a 3 compartment sink if it is
A
One size larger than the largest fixture outlet pipe
7
Q
The copper water service pipe to a building should be
A
Type K or L soft copper tube
8
Q
ABS or PVC horizontal piping must be supported at intervals not exceeding
A
4 feet (1.2 m)
9
Q
A 1/8 th bend refers to a cast iron fitting used to change direction by
A
45 degrees
10
Q
When installing a bypass for a pressure reducing valve, it is best to use a _____ valve
A
Globe valve
11
Q
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
A
C. Without using flux
12
Q
The most common cause of the collapse of a hot water tank is
A
Vacuum
13
Q
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
A
B. Weight of water times surface area
14
Q
The maximum length of a disposal field lateral, according to the BC Health Act is
A
100 ft
15
Q
A pressure tanks main purpose, when used in a rural water supply system, is to
A
Prevent cycling of the pump
16
Q
The actual lift of a pump is less than the theoretical lift. This is caused by:
A
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.
17
Q
The minimum diameter of a water service is:
A
3/4”
18
Q
Threaded drainage fittings installed in a vertical stack are tapped to provide a pitch of ___
A
1/4” per foot
19
Q
A combined sewer carries
A
Sanitary and storm sewage
20
Q
The maximum fall on a trap arm from the weir to the vent is
A
1 pipe diameter
21
Q
The vertical distance between the trap weir and the trap dip is the
A
Trap seal depth
22
Q
The developed length of a branch vent shall be
A
From its upper end to the farthest downstream fixture that it serves
23
Q
An ordinary displacement type water meter registers
A
The total flow though the meter
24
Q
Which of the following meters is two meters in one?
A. Turbine
B. Displacement
C. Oscillating piston
D. Compound
A
D. Compound
Low flow rate: displacement
High flow rate: turbine
25
To prevent a load of pipe that is being lifted from swinging:
A tag line is used
26
The maximum surface temperature that a hot water radiant floor heating panel should not exceed is
80 - 100 ‘F
27
On a deep well convertible jet pump, the suction line is ____ than the drive line
Larger
28
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
29
The pitless adapter is located in the well casing below ____
The frost line
30
This control used on a hot water heating system adjusts the boiler water temperature by measuring the outside air temperature
Outdoor reset control
31
This pipe hanger is best suited to allow pipe movement due to heating and cooling of the pipe
Rolling hanger
32
This valve can modulate water temperature in a hydronic heating system.
Mixing valve
33
The material used for medical gas pipelines is
Degreased copper
34
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
35
Copper tubing sizes are specified by their
Outside diameter
(Tube: inside diameter)
36
“Sensible heat” is defined as heat required to bring about a change in the
Temperature of matter
37
A valve that prevents liquids from flowing back into a drainage system is known as a
Backwater valve
38
In reference to wire rope clips, the “U” bolt portion of the clip must always be placed
On the dead end of the rope
39
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
40
If a solenoid valve is to operate in a system using liquid, how would the valve close?
Using electric current and a spring
41
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
42
The corrosively of water can best be reduced by increasing ____
The pH level
43
A urinal flush tank uses the following method to effect a flush
Siphonic action
44
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
45
Concrete pipe shall not be used
Above ground or inside a building
46
Polyethylene water pipe shall not be used except for
Water service pipe
47
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
48
Outlets which cause pressure drops should be provided with regulating valves. The type of valve most likely to be used is
Needle valve
49
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
50
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
51
The main objective of an air volume control is to maintain the correct
Ratio of water to air in the tank
52
The weir of the trap is
The highest portion of the inside lower surface of the trap
53
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
54
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
55
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
56
Excessively high pressure will cause
Noisy flow
57
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
58
The pressure in a sanitary drainage system should not vary more than
+/- 1 inch water column
59
The shield on a drinking fountain bubbler serves the following purpose
Prevents contamination of the nozzle
60
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”
61
Every roof drain shall be securely connected to a leader and provisions shall be made for
Expansion and contraction
62
The maximum spacing of supports for vertical piping shall be
7.5m (24 ft)
63
PVC water pipe and fittings shall not be used for
Hot water systems
64
Polychloroprene flashing for vent pipes shall be a minimum thickness of
2.89 mm
65
What is the minimum size branch vent for (2) bathroom groups if the vent has a developed length of 7m?
1 1/2”
66
What is the maximum number of shower heads that may be served by a single shower drain?
6
67
ABS or PVC are classified as which type of plastic?
Thermoplastic
68
A relief vent is required under certain conditions when a SOW stack changes direction vertically more than
45 degrees
69
ABS plastic pipe installed nominally horizontal shall be supported at intervals not exceeding
1.2 m
70
When a water test is made on the drainage system, the piping shall be kept filled with water for ___ min
15 min
71
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
72
The location and grade on a benchmark shown on a site plan denotes the
Base point from which levels are measured
73
A flow switch may be found in which of the following systems?
Hot water heating
Fire sprinkler
Hose and standpipe
74
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)
75
What is the process that draws solder into a joint know as?
Capillary action
76
The type of waste connection that would be utilized when installing a potato peeler is
Indirect connection
77
Which type of copper tube will withstand the greatest bursting pressure?
Type K
78
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
79
A fixture drain is
A pipe connecting a trap to another part of the drainage system
80
The theoretical lift of a pump is directly related to
The atmospheric pressure
81
A pump that is connected to a pressure tank starts and stops frequently. This is probably due to
Waterlogging of the tank
82
Asbestos-cement pipe is commonly referred to as
White pipe or transit pipe
83
Drainage piping of 3” diameter and smaller must grade at least
1/4” per foot
84
The minimum water seal of a ptrap is
1 1/2” (38 mm)
Acid = 50mm
85
Plumbing drains are designed to run ______ full for adequate airflow
1/2 to 2/3
86
A “PO” plug stands for
Patented overflow
87
Developed length means
The distance along the centreline of the piping
88
The maximum surface temperature that a hot water radiant floor heating panel should not exceed is
80 - 100 ‘F
89
Nominal pipe size refers to pipe sizes
1/8” to 12” (7-300 mm)
90
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
91
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
92
The condition that would make it necessary to use a vent header on a plumbing installation would be
2 or more vent stacks
93
The minimum diameter of individual vent for a 2” trap is
1 1/2”
94
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
95
Which of the following metals can be classified as ferrous?
A. Copper
B. Lead
C. Cast iron
D. Bronze
C. Cast iron
96
Which two metals will suffer the most from corrosion due to electrochemical action?
Copper and iron
97
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
98
A 1/2” pipe, threaded correctly, will have an effective thread length of
Approximately 1/2”
99
Annealing copper tube means to make it ____
Soft
100
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
101
Which term means a pipe that connects the waste opening of a fixture to the trap serving the fixture?
Fixture outlet pipe
102
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
103
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
104
The highest part of the lower interior surface of a trap
Trap weir
105
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
106
A vent pipe that also serves as a soil-or-waste pipe?
Wet vent
107
What is required when a SOW stack receives discharge from fixtures located on more than 11 stories?
A yoke vent
108
The trap seal refers to the vertical distance measured from the
Trap weir to the trap dip
109
Which fixture operates on an intermittent siphon?
Urinal flush tank
110
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
111
A double sanitary tee fitting shall not be used to connect the trap arms of
Back outlet water closets installed back to back
112
A deep well jet pump with a partially clogged jet would cause
A high vacuum reading in the suction line
113
When a minus pressure is created in a drainage system by the discharging of another fixture, loss of trap seal occurs by
Momentum siphonage
114
The minimum design rate of flow in a building sewer is considered to be approximately
Two feet per second
115
When a shallow well pump starts it reduces _____ in the drop pipe
Atmospheric pressure
116
The types of copper tubing recommended for a water service is
Type L or K (soft)
117
Self closing faucets are used essentially to
Prevent waste of water
118
The water closet bowl that comes in wall outlet type only is
Blowout
119
The size of an air break shall be
1” or equal to the size of the fixture drain
120
This backflow preventer is only suitable as protection against backsiphonage
AVB
121
A vent must terminate no less than ____ above a fresh air inlet
3’ (1 m)
122
A relief vent is required when more than ____ FU discharge past a circuit-vented branch?
6
123
A vent stack is required when fixtures drain to a stack that is more than ____ storeys in height
4
124
Soft temper copper tube shall be supported at intervals not exceeding
2.5m
125
A die marked as 5/8” NC (national coarse) would be used for threading
Mild steel rod
126
Which type of water meter would be best suited to an installation with both large peak flows and relatively low flows?
Compound
127
A standard pipe thread cut is cut at an angle of
60 degrees
128
A flow switch may be found in which systems?
Hot water heating
Fire sprinkler
Hose and standpipe
129
Seals of properly vented legal traps may be broken by
Evaporation
130
The venting of a plumbing system is for the purpose of
Preventing trap siphonage and preventing loss of seal by back pressure
131
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
132
What size pipe wrench is recommended when installing 32 mm (1 1/4”) and 38 mm (1 1/2”) threaded pipe?
46 cm (18”)
133
Name of the tool used to measure the diameter of a pipe groove?
Pi tape
134
The maximum distance from the face of a grinding wheel to the tool rest should be
3 mm (1/8”)
135
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
136
What is the minimum height of a guardrail?
1020 mm (40”)
137
When several ropes are to be attached to a single hook, the connection to the hook is to be made with a
Shackle
138
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
139
What is the circulation in a gravity system caused by?
The difference in the water densities in the system
140
The quantity of heat required to raise or lower the temperature of one pound of water by one degree Fahrenheit
Btu
141
When is a heating system in “thermal equilibrium” ?
When heat loss equals heat added
142
What is the maximum water temperature permitted to a bathtub or shower head?
49 ‘C (120 ‘F)
143
What is the maximum designed flush cycle for a high-efficiency toilet?
4.8 L
