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Plumbing IP > A Little More of Everything! > Flashcards

A Little More of Everything! Flashcards

1
Q

Bell and spigot cast iron is installed with which part upstream?

A

Bell upstream.

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2
Q

When a well pump turns on as soon as a faucet is used the most likely problem is?

A

Water logged pressure tank.

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3
Q

A gear pump is a positive displacement pump and must be installed with a?

A

Pressure relief valve downstream.

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4
Q

How would you increase the length of a flush on a flushometer?

A

Turn regulating screw counter clockwise.

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5
Q

Which backflow preventer is not a testable device?

A

DCAP.

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6
Q

A well with a water tight casing requires minimum distance from a septic system of?

A

30 m.

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7
Q

When determining the location to install a condensing boiler what must be considered?

A

If there is a floor drain near it.

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8
Q

The discharge piping from a service water heater’s temperature and pressure relief valve must discharge within _____ of a floor drain or suitable area.

A

300 mm.

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9
Q

A four wire zone valve is wired to?

A

Thermostat, transformer, end switches.

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10
Q

A twin tank water softener will house the brine in one tank and the other tank will house the?

A

Zeolite.

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11
Q

Water that has a dissolved mineral content of > 181 mg/t would be deemed?

A

Very hard.

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12
Q

A private water supplied cistern is fitted with a 3/4” makeup water pipe supplied by a municipal system. What size air gap would be required?

A

1 1/2”

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13
Q

Which manufacturing method produces the strongest pipe?

A

Extruded.

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14
Q

What is it called when you pour concrete in stages?

A

Lifts.

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15
Q

If you had to remove a toilet and then put it down again after you have raised the floor what would you use?

A

Wax horn or flange extension kit.

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16
Q

Valves used on domestic hot water supply tanks and heaters include?

A

Pressure, temperature and vacuum relief valve.

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17
Q

In order to bend hard copper you must?

A

Heat the copper and then cool, then bend it.

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18
Q

When gluing small diameter PVC pipe (< 2”), can it be done without the use of primer?

A

Yes.

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19
Q

Which chemical is approved for disinfecting surface water used as a potable supply?

A

Sodium hypochlorite.

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20
Q

How do you secure a gas cylinder?

A

Secured upright with a cap.

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21
Q

What is the definition of “blackwater”?

A

Sewage that contains waste from toilets only.

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22
Q

How do you calculate the minimum radius for a bend of schedule 40 2” pipe?

A

6 x the diameter of the pipe. 12” in this case.

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23
Q

Will a 120 line pump voltage or a 240 line pump voltage be the most energy efficient?

A

240 line voltage.

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24
Q

How do you figure out which size pipe wrench to use on a piece of pipe?

A

Take the diameter of the pipe and times it by 12. Ex: 1 1/2” pipe x 12 = 18” pipe wrench.

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25
Q

If an electric hot water tank experiences a backsiphonage condition, what will happen?

A

Top element will burn out.

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26
Q

A T&P valve on a natural gas fired hot water tank starts dripping whenever the burner fires. What is the possible problem?

A

Expansion tank is waterlogged.

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27
Q

How efficient is an immersion element electric hot water tank?

A

100%.

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28
Q

What adjustment would be required for an electronic flush valve if it is being activated by people walking 6 feet away from it?

A

Adjust the length of the infrared sensor.

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29
Q

What does the small hole located on the dip tube of a hot water tank prevent?

A

Siphonage of water from the tank.

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30
Q

How do you allow for the grade on a branch when installing four wall hung water closets?

A

Adjust the height of each face plate.

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31
Q

What is the purpose of the threaded nipple on a chair carrier for a commercial wall-hung water closet?

A

To allow for different wall thickness and finishes.

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32
Q

What type of toilet is usually used for a wall outlet toilet?

A

Blowout.

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33
Q

How high is the overflow rim height of a barrier free toilet? A regular toilet?

A

16” and 15”.

34
Q

A residential wall-hung toilet would most likely be what type of bowl?

A

Siphon jet or reverse trap with jet.

35
Q

What is used to connect a wall-hung water closet tank to the bowl?

A

A “flush elbow”.

36
Q

Backsiphonage from a flush valve-operated water closet can be prevented by installation of a _______ between the flush valve and the toilet bowl.

A

Vacuum breaker.

37
Q

What is another name for a two-piece toilet?

A

Close coupled.

38
Q

A compression stop is categorized as a?

A

Globe valve.

39
Q

What is thread pitch?

A

The number of threads per inch.

40
Q

The thread angle on a American Standard Pipe Thread is?

A

60 degrees.

41
Q

What are the number of threads per inch for 1/2” and 3/4” pipe?

A

14.

42
Q

What are the number of threads per inch for 1”, 1 1/4”, 1 1/2” and 2” pipe?

A

11 1/2.

43
Q

What are the number of threads per inch for 2 1/2” pipe and greater?

A

8.

44
Q

Why is it possible to cut threads on pipes of different diameters with the same die chasers?

A

They have the same number or threads per inch. Ex: 1/4” and 3/8” nominal pipe size have 18 threads per inch.

45
Q

What is thread engagement?

A

The amount of pipe thread necessary to make a tight connection between pipe and fitting.

46
Q

What is the thread engagement (inches) when 1/2” pipe is tight in a fitting?

A

1/2”.

47
Q

What is the thread engagement (inches) when 1”, 1 1/4” and 1 1/2” pipe is tight in a fitting?

A

11/16”.

48
Q

What is the thread engagement (inches) when 3/4” pipe is tight in a fitting?

A

9/16”.

49
Q

What are pipe taps used for?

A

Cut or restore internal pipe threads.

50
Q

Piping and tubing are described by their nominal pipe sizes (NPS). What are nominal pipe sizes?

A

Approximate inside diameters, measure in inches.

51
Q

What standard or rating system directly relates pipe dimensions to pressure ratings?

A

Standard Dimension Ratio (SDR).

52
Q

What is Standard Dimension Ratio (SDR)?

A

The ratio of the average outside diameter to the minimum wall thickness measure in inches. SDR=(outside diameter)/(minimum wall thickness)

53
Q

Theoretically, different sizes of piping made of the same material, with the same SDR, should have the same pressure ratings. True or False?

A

True.

54
Q

What are the color codes for ACR and Type GP tubing?

A

ACR - blue Type GP - yellow

55
Q

Pressure reducing valves are installed in domestic applications to reduce incoming water to?

A

50 to 60 psi (344 to 413 kPa).

56
Q

What two valves must be installed on the discharge side of a sewage pump?

A

Check valve followed by a gate valve if the pipe cannot be easily drained.

57
Q

If there are water leaks around your faucet handles, with the water turned on or off, the problem could be ?

A

A loose packing nut, worn packing, worn O-ring or a damaged stem.

58
Q

Most leak problems on port faucets are due to?

A

Faulty O-rings or plugging mechanisms, such as the disk, cartridge or ball.

59
Q

If a bathtub or sink spout is dripping when the water is turned off, what needs to be repaired?

A

Washer or Seat.

60
Q

What type of control is used with a water fountain?

A

Self-closing stop valve.

61
Q

What do thermostatic control valves on shower heads or bathtubs spouts do?

A

Measure temperature and control mixing of hot and cold water.

62
Q

Thermostatic control valves have a safety feature that shuts off water supply when?

A

The cold water drops too low.

63
Q

What are the standard temperature and pressure relief valve settings on a domestic hot water tank?

A

Temperature relief at 99oC (210oF)

Pressure relief at 150 psi (1050 kPa)

64
Q

What type of materical is being burned in a Class A fire?

A

Ordinary combustibles such as wood, paper, textiles, rubber and plastics.

65
Q

What type of material is being burned in a Class D fires?

A

Fires involving combustible metals such as titanium, magnesium, aluminum, and potassium.

66
Q

What type of material is being burned in a Class C fire?

A

Fires involving energized electrical equipement.

67
Q

What type of material is being burned in a Class B fire?

A

Flammable or combustible vapours including gasoline and oils.

68
Q

What type of fire extinguisher is best to use on Class D fires?

A

Use dry chemical extinguishers to put out the fire and can also use water to cool down large fires.

69
Q

What type of fire extinguisher is best to use on Class C fires?

A

First disconnect the power supply and then use either a carbon dioxide (CO2) or

dry chemical extinguisher.

70
Q

What type of fire extinguisher is best to use on Class B fires?

A

Carbon dioxide (CO2) extinguishers starve the fire of oxygen which can also be accomplished by using a set blanket or sand.

Dry chemical extinguishers.

71
Q

What type of fire extinguisher is best to use on Class A fires?

A

Water. Cools the fire down to below its ignition temperature and prevents re-ignition from resideual heat or glowing embers.

72
Q

What two classes of fires should you NOT use water to extinguish?

A

Class B and Class C fires.

73
Q

What is the best general fire extinguisher currently on the market?

A

Triplex dry chemical.

74
Q

To decrease the pressure supplied by a PRV, turn the regulating screw?

A

Counter clockwise.

75
Q

What is back-siphonage caused by?

A

Negative pressure or a reduced pressure in the supply piping.

76
Q

How does back pressure cause backflow to occur?

A

When the potable supply piping is connected to a system or fixture which exceeds the operating pressure of the potable supply piping.

77
Q

When is a vent stack required?

A

Only required when a soil-or-waste stack has branches with fixtures draining into the soil-or-waste stack from five or more stories.

78
Q

Double check vavle assemblys (DCVA) are used to protect the potable water system from what type of hazards? What type of backflow does it prevent against?

A

Substances which are not hazardous to health.

Both back pressure and back-siphonage.

79
Q

Reduced pressure principle backflow prevention devices (RPBD) are used to protect the potable water system from what type of hazards? What type of backflow does it prevent against?

A

Extreme hazards which may be injurious to health.

Both back pressure and back-siphonage.

80
Q

What are the principal cause of back-siphonage (4)?

A
  1. Undersized piping
  2. Water main repair or a break in the city or municipal water supply that is lower than a service point
  3. Lowered water main pressure due to high water withdrawal rate, such as fire fighting or water main flushing
  4. Reduced supply pressure on the suction side of a booster pump
81
Q

What are the main causes of back pressure (4)?

A
  1. Booster pumps
  2. Potable water connections to boilers and other pressure systems
  3. Interconnections with another system which operates at a higher pressure
  4. Elevated piping, 9m or 30 feet above finished grade
82
Q

Where is the base of a vent stack connected?

A

Always connected at or below the lowest horizontal branch on a soil-or-waste stack.

Plumbing IP (6 decks)

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