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Level 4 Plumbing > IP practice 2 > Flashcards

IP practice 2 Flashcards

1
Q

when installing a septic tank u can use a gravity system if ____ ..

A

field is lower than the outlet of the tank

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2
Q

when the field is above the inlet of the septic tank what must u use

A

a pump

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3
Q

what could be the problem if boiler safety relief valve keeps discharging

A

failure of pressure reducing valve or faulty aquastat

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4
Q

what do u require on a cooling tower

A

water softener, rp, pressure vacuum breaker, and air gap

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5
Q

what type of heater can be use when theres not enough room for fin

A

kick space heater

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6
Q

what connectors does a chiller use

A

flexible flanged connectors

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7
Q

on recessed forced flow heating install thermostat on

A

return air next to the unit

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8
Q

best location for a wild loop in heating

A

inside doorways (vestibules)

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9
Q

wiring on submersible should be strapped every

A

10ft

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10
Q

pipe from pitless adapter should be graded ____ …

A

up towards the house

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11
Q

1) when troubleshooting pump there is high amperage, what is the problem
2) low amperage ?
3) no amperage ?

A

1) high amp means impeller is stuck so the pump is working too hard
2) low amp means theres low water in well, impeller is broken or venture is plugged
3) no amp means defective pressure switch, switch tube might be plugged

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12
Q

when there is cavitation what could be the problem w the pump

A

pump is working above max lift capacity, and there’s a pressure difference between inlet/outlet

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13
Q

standard pressure tank is ___ air and ___ water

A

1/3 air and 2/3 water

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14
Q

what is a common problem when there is hardness in the water

A

there is calcium and magnesium

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15
Q

degrees of hardness in water starts from very soft at 0 - ____ and adds ____ every time it gets harder

A

0-50, adds 50 to get to next level of hardness and so on ex. mid soft is 50-100 mid hard is 100-150 etc

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16
Q

temporary hardness settles at ___ deg C

permanent hardness at ___ deg C

A

temp hardness - 60 deg C

perm hardness - 140 deg C

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17
Q

what causes back siphonage ? it might happen to a hose bib so what does it require

A

negative pressure in the system, like a vacuum. so hose bibs require a vacuum breaker

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18
Q

test pressure for medical gas

A

150psi or 1 and a half times its working pressure whichever is greater for 24 hours

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19
Q

if flush valve has a long flush it could be because of a

A

dirty/plugged bypass

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20
Q

distance of soil from edge of trench

A

1m or 3’3”

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21
Q

max heigh of rp to floor

A

5 feet

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22
Q

if a zone valve is noisy it was probably installed ___

A

backwards

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23
Q

where do u install mitigated radon pipe

A

under slab

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24
Q

interior leaders and sows must have a cleanout where?

A

3m upstream from the bottom of the leader or stack

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25
Q

when doing a ball test what are the min. diameters for the ball

A

50mm for pipes 3 inches or more

25mm for pipes less than 3 inches

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26
Q

minimum trap arm length of unvented fixture drain

also the standard height of the trap arm for a lavatory

A

18 inches or 450mm

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27
Q

minimum trap fixture drain

A

2”

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28
Q

max height from manhole taper

A

1m

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29
Q

what to do if hot water pipe is longer than 30m or extend 4 storeys ?

A

provide recirculation

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30
Q

what type of copper is permitted in drainage

A

dwv copper, type k, and type L hard copper

31
Q

PVB shall at least _____mm above the flood level rim of a fixture or tank

A

300mm

32
Q

how do u change top element in a hwt

A

shut power then water, drain tank, change element, close drain, turn on water then power

33
Q

insufficient hot water from a hwt could be because of a

A

broken dip tube

34
Q

what fitting could be use in between cleanouts on a building sewer

A

2 - 22 1/2 elbows

35
Q

which drawings should be referenced when determining (DETAILED) locations of sleeves in concrete floors in high rise construction

A

gridlines on the architectural drawings

36
Q

what is another way of protecting underground piping besides thrust blocks

A

continuous rodding

37
Q

what equipment is installed when booster pumps are used in the water distribution piping of a high rise

A

expansion tanks

38
Q

where is the jet assembly located for a deep well jet pump

A

5 feet below the water level

39
Q

at what pressure should a diaphragm pressure tank be pre-charged to

A

2-3 psi below the cut in pressure

40
Q

flood level rim height of a standard water closet is

A

15 inches

41
Q

in the gasfitting and refrigeration trades copper tubing sizes are commonly specified by

A

their exact outside diameter

note: for copper water sizes in the plumbing trade we use nominal inside diameter

42
Q

what knot can be used to join two ropes of different diameters

A

sheet bend

43
Q

what type of hanger is use to support multiple pipe lines

A

trapeze

44
Q

what type of drawing is used for more accurate scale and a more realistic appearance to represent a piping system

A

double line drawings

45
Q

the minimum number of planks and their dimensions for a working platform shall be

A

2 planks, 2 inch x 10 inch nominal

46
Q

what type of valve is used in the food processing industry to avoid product contamination

A

diaphragm valve

47
Q

what are the requirements for installing a zone shut off valve within a valve box used for medical gas

A

if the valve handle is closed, the door can not be closed

48
Q

air dryers are installed downstream of the ___ ____

A

receiving tank

49
Q

branch lines for a compressed air system should be taken off the ______ of the supply main

A

top

50
Q

if the pressure of water in a hydronic heating system was to drop below boiling what is the result

A

cavitation

51
Q

turning a prv’s adjusting screw clockwise will ____ ____

A

increase pressure, vice versa

52
Q

where is the cooling coil located on a combination heating and cooling furnace system

A

in the supply plenum close to the furnace

53
Q

which type of hanger or support would be used on a piping system that may experience a wide temperature variation

A

roller

54
Q

an expansion tank in a hydronic heating system should be able to accommodate a ____ increase in water volume

A

4%

55
Q

the type of valve used to even out the flow in split zone heating system is the

A

balancing valve

56
Q

the type of valve needed on a domestic hot water side of a heat exchanger would be a ______ valve

A

tempering

57
Q

what device is used to sense an unsafe water level in a hot water heating system

A

a low water cut off

58
Q

what is required when a conventional boiler is installed in a low temperature radiant floor heating application

A

a mixing valve

59
Q

which piece of equipment would be required on all steam boilers and hot water boilers over 400 MBH

A

low water cut off

60
Q

when using a solar heating system like a space heating boiler to heat domestic hot water, which equipment is required

A

heat exchanger

61
Q

what is a heated area that is required by one circulator, control or thermostat

A

zone

62
Q

where should the connections be made on an upfed cast iron radiator

A

bottom in bottom out

63
Q

what would be installed between a cooling fan coil and the fixed piping attached to the building structure

A

isolation valves and flex connectors

64
Q

what would be installed in the piping to and from a chiller when it is being supported by rubber isolation pads

A

flex connectors

65
Q

where would the FLOW SWITCH be installed in a low mass boiler

A

on the hot water supply line from the boiler

66
Q

where should the balancing valves be located for a radiant panel heating system

A

on the return header

67
Q

when a boiler is being used to heat the domestic water through an indirect tank, what are required on the domestic water piping

A

check valve and tempering valve

68
Q

this device adjusts the boiler water temperature depending on the outdoor temperature

A

boiler reset control

69
Q

max cumulative change of direction allowable on a trap arm for a basin

A

135 degrees

70
Q

which of the following best describes the length of time for a piston or diaphragm flush valve to cycle

A

size of the bypass orifice

71
Q

how is the volume of a urinal flush tank controlled

A

metering valve

72
Q

if the jet assembly in a deep well jet pump system must be lowered what must be done also

A

re-adjust the control valve

73
Q

which chemical will damage pyrex pipe

A

hydrofluoric acid

Level 4 Plumbing (2 decks)

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