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Plumbing IP > Assorted > Flashcards

Assorted Flashcards

1
Q

A customer complains of noise and vibration whenever the hot water faucet is turned on. What is the most likely cause?

a. The water is too hot
b. There is air trapped in the piping
c. The compression washer is loose
d. The water pressure is too high

A

c. The compression washer is loose

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2
Q

To increase the outlet pressure from a pressure reducing valve, the plumber would?

A

Turn the adjusting screw clockwise.

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3
Q

The control valve on the water supply to a domestic dishwasher would be?

A

Electrically operated.

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4
Q

What is the reason for having a recirculation line on the hot water distribution line?

A

To supply hot water to the furthest fixtures immediately.

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5
Q

A meter bypass MUST be installed if the meter is?

A

Larger than 1 1/2”.

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6
Q

Which valves would be required for a 2” water meter installation?

A

2 shut off valves, 1 by-pass valve and 1 drain valve.

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7
Q

What would occur if the bypass orifice on a flushometer was blocked?

A

Continuous flush.

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8
Q

What would occur if the bypass orifice on a flushometer was partially blocked?

A

Longer than normal flush.

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9
Q

What would cause a toilet to run continuously (2)?

A
  1. Flapper is broken or off the seat.

2. Float ball is set too high and never gives fill valve chance to close.

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10
Q

Which contaminants are we trying to eliminate with water treatment?

A

Iron, manganese, sulphur, bacteria, algae & fungi, calcium & magnesium.

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11
Q

What are the primary substances contained in hard water?

A

Calcium, bicarbonates & magnesium.

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12
Q

What should the piping downstream of a reverse osmosis unit be made of?

A

Plastic. Soft water will eat away at copper or steel piping.

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13
Q

How is the drain line from a reverse osmosis unit connect to a plumbing drainage system?

A

Indirectly connected to either a storm or sanitary system.

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14
Q

What type of filtering media does an iron filter use?

A

Manganese greensand.

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15
Q

What is the regenerating agent in an iron filter (manganese greensand filter)?

A

Potassium permanganate.

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16
Q

What is the problem if the water tastes salty from a water softening system?

A

Rinse cycle is too short.

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17
Q

What procedure must be done if the water after a water softener is still hard water?

A

It must be regenerated.

18
Q

How would you clean the nozzle (orifice) of a water softener?

A

Soak it in an acid solution (CLR).

19
Q

To assure that bacteria is effectively eliminated in a commercial dishwasher, the final rinse temperature should be at least?

A

180 degrees F.

20
Q

If an existing water distribution system that contains an iron filter is experiencing a drop in pressure and an increase in the PPM of iron downstream of the filter, what should be done?

A

Backwash the filter and then regenerate it with potassium permanganate.

21
Q

What is well yield?

A

Sustainable rate of water flow (GPM) that a well can draw continuously over an extended period.

22
Q

How long is a well yield test done for to determine well yield? What is a good well yield?

A

1 hr. 5 GPM.

23
Q

What would be the result of a leaky foot valve on a jet pump assembly?

A

Loss of prime in the pump.

Intermittent cycling.

24
Q

What is a torque arrestor? Where is it installed?

A

Designed to keep submersible pump centered and to prevent any twisting in the well casing.
Installed directly above the pump on the riser pipe.

25
Q

What is the equation for total head?

A

Total head= suction head + discharge head

26
Q

Where is a tempering valve found? Where is a mixing valve found?

A

Tempering valve - domestic hot water systems (potable).

Mixing valve - domestic heating systems.

27
Q

What’s the difference between a tempering valve and a mixing valve?

A

Tempering valves have fixed incoming & outgoing temps.

Mixing valves you can change how much cold & hot get mixed.

28
Q

A direct return heating system is being used in a building. The heat in the rooms is not controlled individually but by a central thermostat. It is noticed that one of the rooms is hotter than the others. How can this be fixed?

A

Adjust balancing valve; make it more restricted so less water flows through.

29
Q

What are the two different solar heating systems?

A
  1. Anti-freeze system

2. Drain-back system

30
Q

What are the two types of solar collectors?

A
  1. Flat Plate

2. Evacuated Tube

31
Q

Anti-Freeze systems are completely filled with?
What two things do they require?
The controller monitors?

A

Fluid.
Requires buffer tank and outside heat dump to avoid excessive heat.
Collector temp and tank temp.

32
Q

In an anti-freeze system what happens when the collector temp exceeds the tank temp?

A

System turns on to heat the tank.

33
Q

How is the drain-back system protected from freezing?

Is the system completely full of fluid like the Anti-freeze system?

A

Drains exposed piping to protect it from freezing.

No.

34
Q

In which system can the same water in the solar collector system be circulated through the heating system?

A

Drain-back system because there is no anti-freeze in the system.

35
Q

For severe health hazards caused by both back pressure and back siphonage conditions, when an air gap is not appropriate or impractical what backflow preventer should be used?

A

The Reduced Pressure Principle (RP) or Reduced Pressure Principle Detector (RPD).

36
Q

For severe health hazards caused by back siphonage only what backflow preventer should be used?

A

Pressure Vacuum Breaker (PVB) or Spill-Resistant Pressure Vacuum Breaker (SRPVB).

37
Q

For moderate health hazards caused by both back pressure and back siphonage what backflow preventers may be used?

A

Double Check Valve Assembly (DCVA) or Double Check Detector Assembly (DCDA).

38
Q

What is the backsight? Foresight?

A

Backsight is the first measurement taken on a point of known elevation.
Foresight is the last measurement taken before the instrument is moved.

39
Q

What is the “turning point”?

A

A point on which a foresight has been taken and which is now used for a backsight.

40
Q

Where is the in-line high pressure sensor for a medical gas system located?

A

Downstream of the pressure regulator.

41
Q

On a private domestic water system, what is the usual cut-in and cut-out pressures be set at?

A

207 kPa and 345 kPa (30 psi and 50 psi).

Plumbing IP (6 decks)

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