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Plumbing 4th Year > Water Supply > Flashcards

Water Supply Flashcards

1
Q

A water softener must always be installed____of a hot water heater

A

Upstream

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2
Q

Which is allowed to train into a septic tank?
A) weeping tile
B) softener back wash
C) Garbage grinder
D) hot tub

A

Garbage grinder

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3
Q

The amount of flow an impeller will produce is mainly a function of its what?

A

Variable displacement

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4
Q

What causes back siphonage?

A

A fire truck using a fire hydrant

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5
Q

What method is used for lowering a 100-ft submersible pump down with PVC piping?

A

A truck with a well pump hoist

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6
Q

The best method for removing taste and odor problems from water is by the use of a?

A

Activated carbon filter

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7
Q

If a jet pump two pipe system is working close to its lifting capacity, what options are available to you, to increase its capacity?

A

Increase the suction and driveline sizes

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8
Q

The iron content of water should not exceed:

A

0.3 PPM

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9
Q

True or false; reverse osmosis can be used to treat bacteriological unsafe water?

A

False

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10
Q

The total hardness of water should not exceed___gpg in residential applications:

A

3.5

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11
Q

What is the recommended regeneration cycle for water softeners?

A

3 days

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12
Q

A vacuum gauge on the suction side of a running pump would show what, if the foot valve was stuck closed?

A

High vacuum

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13
Q

Which regeneration process provides for a better reserve area in a water softener?

A

Upflow

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14
Q

What are the factors that contribute to water’s ability to dissolve soluble material?

A

Solubility of material, time of contact, pH water, temperature of water

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15
Q

Rain water is normally:
A) corrosive
B) relatively soft
C) slightly acidic
D) all of the above

A

All of the above

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16
Q

When using spring water as your Source, how do you collect the water and protect it from contamination?

A

An impoundment box around the spring

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17
Q

Centrifugal pumps that are piped in series will result in what?

A

Increased pressure

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18
Q

What type of pump would be best suited for fuel transfer use?

A

Diaphragm

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19
Q

Which gas is widely used to disinfect water?

A

Chlorine

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20
Q

What is the maximum practical suction lift at 2,000 ft above sea level?

A

23 ft

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21
Q

What prevents back siphonage on a flush valve for a water closet?

A

Vacuum breaker

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22
Q

The process by which normal flow through a filter bed is reversed, thus cleaning the bed is known as what?

A

Backwashing

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23
Q

Is harvested rainwater treated?

A

Yes

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24
Q

Water heater temperature should not be set higher than 140° f in order to prevent____hardness from precipitating out of solution:

A

Temporary

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25
A centrifugal pump works on what principle?
Bernoulli's
26
A shallow well is normally defined as being no more than how many feet deep?
25
27
How is the amount of alkalinity present in water normally measured?
Ph scale
28
According to your modules, each stage of a submersible pump will produce how many PSI?
9 PSI
29
When servicing a diaphragm flush valve, what stops the flush cycle?
Force in the upper chamber
30
What are normal presser switch settings for residential use?
30 to 50 psi
31
What is the acceptable pH range for potable water?
6.5 to 8.5
32
What is the maximum pressure allowed at a fixture?
550 kPa
33
What is the most common type of pump used in a private water supply system?
Centrifugal
34
What indicates hardness in water?
Dissolved, calcium and magnesium in water
35
Which type of treatment kills bacteria when used and installed correctly?
Chlorination
36
A pump that will lift water 345 ft, will develop a pressure of how many PSI?
149.39 PSI (.433 psi/1' WC)
37
What type of pump would be best suited to add chlorine to a water system?
Meetering
38
What is the daily water requirement per person (US gallons) used when sizing private water supply systems?
60 US gallons
39
What is the main problem with high-rise buildings using a down feed system?
Balancing the hot water
40
What is the minimum grade of polyethylene pipe approved for use as a pump drop pipe?
Series 160
41
What prevents the water from draining out of the pipe drop when the jet pump stops running?
Foot valve
42
Temperature, taste, color, odor, and turbidity are all considered____characteristics of water:
Physical
43
What type of pump would be best suited to move body fluids in a hospital setting?
Peristaltic
44
Which is a differential pressure backflow preventer? A) dcap B) dcva C) rp D) pvb
Rp
45
The amount of pressure an impeller will produce is mainly a function of its what?
Diameter
46
As high pressure water enters the ejector of a jet pump, it passes through the____and is converted to high velocity water:
Nozzle
47
What type of treatment would a water softener be considered?
Ion exchange
48
True or false. The settling chamber or calming inlet is installed after the storage tank
False
49
A pH reading of 2.0 would be considered:
Extremely acidic
50
What converts the high velocity water in a jet pump ejector to high pressure water?
Venturi
51
Other than water closets, urinals and clothes washing machines. What other plumbing or systems can you run rainwater to?
Floor mounted service sinks, laundry trays, trap primers, irrigation, hydronic systems, make of water for heat, rejection systems and other applications where the water is not ingested or inhaled
52
The horizontal water service from the well is back graded from the pitless adapter. What will this cause?
It will cause a loss of prime
53
True or false, rain water or non-potable water cannot be installed over a food prep area?
True
54
Untreated water is known as___water:
Raw
55
A vacuum reading of 1" hg will lift water How high?
1.13 ft
56
True or false. Installing some 50 gallon barrels under your residential eaves troughs is considered to be rainwater harvesting
False
57
The larger of the two pipes on a deep well jet pump is the _____ line:
Jackson
58
Where does a drilled well draw its water from?
An aquifer
59
When sizing water softeners, 1 PPM of iron is equivalent to how many gpg of hardness?
4
60
Water containing h2s in excess of ___mg/l is considered to be aesthetically objectionable:
.05
61
A residential well using a submersible pump would normally have a casing, how many inches in diameter?
4"
62
As high velocity water leaves the impeller veins and enters the volute, it slows and changes to what?
High pressure
63
A pressure expressed in terms of height of a column of fluid in feet is defined as:
Head
64
What is the most likely cause of a pump turning on every time there's a demand for water?
Pressure tank waterlogged
65
The distance in feet or meters that water lowers when the well is being pumped is defined as:
Drawdown
66
The process by which air is brought into intimate contact with water is known as:
Aeration
67
The simplest method for removing iron (0.3 PPM or less) from water is by the use of a____
Water softener
68
What is one of the most common reasons why an RO system will continuously run water down the drain?
The ASO valve is broken
69
True or false. All piping downstream of a reverse osmosis unit must be plastic
True
70
Soft water is considered to have a hardness of less than____gpg
1
71
What happens when a diaphragm flush valve finishes its cycle?
Force in the upper chamber is higher than the lower chamber
72
True or false. A spring will always supply high quality water
False
73
Which of the following determines when the pump starts and stops? A) impeller B) pressure switch C) thermal overload D) volute
Pressure switch
74
When using a pressure tank without air/water separation, how do you remove or vent gases from water in the tank?
Air volume control
75
What is the maximum acceptable amount of e coli permitted in potable water?
0. PPM
76
What CCC protection device is required for a shampoo sink?
Vacuum breaker
77
A centrifugal pump should cycle no more than____ times per hour
25
78
The rate at which water flows into a well from its supplying aquifer is defined as:
Recovery rate
79
The amount of water a well is capable of supplying at a given time is defined as:
well yield
80
A device for storing water, usually underground, is defined as a:
Cistern
81
How often should the water from a well be tested to ensure it is potable?
Once a year minimum
82
What is the maximum practical suction lift at sea level?
25 ft
83
The amount of flow an impeller will produce is mainly a function of it:
Width
84
Which type of pressure tank would use an air volume control?
Standard
85
A pressure switch usually has a pressure differential setting of how many PSI?
20
86
Sewage pumps generally use what type of impeller?
Open
87
The pressure relief valve in a private centrifugal water supply system should be set____PSI above cutout pressure:
15
88
What is the minimum size of a pressure tank for agricultural applications?
42 gallons
89
How are flow rates for pumps normally expressed?
US gallons per minute
90
A vacuum gauge on the suction side of a running pump would show________if there was a large hole in the drop pipe above the water line:
Low vacuum
91
What is the correct ratio of air to water in a standard pressure tank?
1/3 air to 2/3 water
92
Pressure tanks are sized so that pumps will run for a minimum of____minutes:
2.4
93
The NFPA recommends a minimum supply of____gallons of water for 2 hours for firefighting purposes
1200
94
What must be done to water from a dugout prior to human consumption?
It must be treated

Plumbing 4th Year (6 decks)

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