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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
Q

A centrifugal pump works on what principle?

A

Bernoulli’s

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26
Q

A shallow well is normally defined as being no more than how many feet deep?

A

25

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27
Q

How is the amount of alkalinity present in water normally measured?

A

Ph scale

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28
Q

According to your modules, each stage of a submersible pump will produce how many PSI?

A

9 PSI

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29
Q

When servicing a diaphragm flush valve, what stops the flush cycle?

A

Force in the upper chamber

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30
Q

What are normal presser switch settings for residential use?

A

30 to 50 psi

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31
Q

What is the acceptable pH range for potable water?

A

6.5 to 8.5

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32
Q

What is the maximum pressure allowed at a fixture?

A

550 kPa

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33
Q

What is the most common type of pump used in a private water supply system?

A

Centrifugal

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34
Q

What indicates hardness in water?

A

Dissolved, calcium and magnesium in water

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35
Q

Which type of treatment kills bacteria when used and installed correctly?

A

Chlorination

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36
Q

A pump that will lift water 345 ft, will develop a pressure of how many PSI?

A

149.39 PSI (.433 psi/1’ WC)

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37
Q

What type of pump would be best suited to add chlorine to a water system?

A

Meetering

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38
Q

What is the daily water requirement per person (US gallons) used when sizing private water supply systems?

A

60 US gallons

39
Q

What is the main problem with high-rise buildings using a down feed system?

A

Balancing the hot water

40
Q

What is the minimum grade of polyethylene pipe approved for use as a pump drop pipe?

A

Series 160

41
Q

What prevents the water from draining out of the pipe drop when the jet pump stops running?

A

Foot valve

42
Q

Temperature, taste, color, odor, and turbidity are all considered____characteristics of water:

A

Physical

43
Q

What type of pump would be best suited to move body fluids in a hospital setting?

A

Peristaltic

44
Q

Which is a differential pressure backflow preventer?
A) dcap
B) dcva
C) rp
D) pvb

A

Rp

45
Q

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

A

Diameter

46
Q

As high pressure water enters the ejector of a jet pump, it passes through the____and is converted to high velocity water:

A

Nozzle

47
Q

What type of treatment would a water softener be considered?

A

Ion exchange

48
Q

True or false. The settling chamber or calming inlet is installed after the storage tank

A

False

49
Q

A pH reading of 2.0 would be considered:

A

Extremely acidic

50
Q

What converts the high velocity water in a jet pump ejector to high pressure water?

A

Venturi

51
Q

Other than water closets, urinals and clothes washing machines. What other plumbing or systems can you run rainwater to?

A

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
Q

The horizontal water service from the well is back graded from the pitless adapter. What will this cause?

A

It will cause a loss of prime

53
Q

True or false, rain water or non-potable water cannot be installed over a food prep area?

A

True

54
Q

Untreated water is known as___water:

A

Raw

55
Q

A vacuum reading of 1” hg will lift water How high?

A

1.13 ft

56
Q

True or false. Installing some 50 gallon barrels under your residential eaves troughs is considered to be rainwater harvesting

A

False

57
Q

The larger of the two pipes on a deep well jet pump is the _____ line:

A

Jackson

58
Q

Where does a drilled well draw its water from?

A

An aquifer

59
Q

When sizing water softeners, 1 PPM of iron is equivalent to how many gpg of hardness?

A

4

60
Q

Water containing h2s in excess of ___mg/l is considered to be aesthetically objectionable:

A

.05

61
Q

A residential well using a submersible pump would normally have a casing, how many inches in diameter?

A

4”

62
Q

As high velocity water leaves the impeller veins and enters the volute, it slows and changes to what?

A

High pressure

63
Q

A pressure expressed in terms of height of a column of fluid in feet is defined as:

A

Head

64
Q

What is the most likely cause of a pump turning on every time there’s a demand for water?

A

Pressure tank waterlogged

65
Q

The distance in feet or meters that water lowers when the well is being pumped is defined as:

A

Drawdown

66
Q

The process by which air is brought into intimate contact with water is known as:

A

Aeration

67
Q

The simplest method for removing iron (0.3 PPM or less) from water is by the use of a____

A

Water softener

68
Q

What is one of the most common reasons why an RO system will continuously run water down the drain?

A

The ASO valve is broken

69
Q

True or false. All piping downstream of a reverse osmosis unit must be plastic

A

True

70
Q

Soft water is considered to have a hardness of less than____gpg

A

1

71
Q

What happens when a diaphragm flush valve finishes its cycle?

A

Force in the upper chamber is higher than the lower chamber

72
Q

True or false. A spring will always supply high quality water

A

False

73
Q

Which of the following determines when the pump starts and stops?
A) impeller
B) pressure switch
C) thermal overload
D) volute

A

Pressure switch

74
Q

When using a pressure tank without air/water separation, how do you remove or vent gases from water in the tank?

A

Air volume control

75
Q

What is the maximum acceptable amount of e coli permitted in potable water?

A
  1. PPM
76
Q

What CCC protection device is required for a shampoo sink?

A

Vacuum breaker

77
Q

A centrifugal pump should cycle no more than____ times per hour

A

25

78
Q

The rate at which water flows into a well from its supplying aquifer is defined as:

A

Recovery rate

79
Q

The amount of water a well is capable of supplying at a given time is defined as:

A

well yield

80
Q

A device for storing water, usually underground, is defined as a:

A

Cistern

81
Q

How often should the water from a well be tested to ensure it is potable?

A

Once a year minimum

82
Q

What is the maximum practical suction lift at sea level?

A

25 ft

83
Q

The amount of flow an impeller will produce is mainly a function of it:

A

Width

84
Q

Which type of pressure tank would use an air volume control?

A

Standard

85
Q

A pressure switch usually has a pressure differential setting of how many PSI?

A

20

86
Q

Sewage pumps generally use what type of impeller?

A

Open

87
Q

The pressure relief valve in a private centrifugal water supply system should be set____PSI above cutout pressure:

A

15

88
Q

What is the minimum size of a pressure tank for agricultural applications?

A

42 gallons

89
Q

How are flow rates for pumps normally expressed?

A

US gallons per minute

90
Q

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:

A

Low vacuum

91
Q

What is the correct ratio of air to water in a standard pressure tank?

A

1/3 air to 2/3 water

92
Q

Pressure tanks are sized so that pumps will run for a minimum of____minutes:

A

2.4

93
Q

The NFPA recommends a minimum supply of____gallons of water for 2 hours for firefighting purposes

A

1200

94
Q

What must be done to water from a dugout prior to human consumption?

A

It must be treated

Plumbing 4th Year (6 decks)

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