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Level 4 Plumbing > IP practice > Flashcards

IP practice Flashcards

1
Q

make up water is connected to _______

A

supply

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2
Q

finned baseboard is an example of _____ heating

A

convection

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3
Q

pipe length x temp diff x coe = ______

A

expansion

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4
Q

oxygen colour

A

green/white

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5
Q

medical air colour

A

black and white

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6
Q

how many cuft of air require to compress 1cuft of air 100 psi

A

100psi / 14.73 = 7cuft

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7
Q

what is downstream of the piston compressor

A

intercooler

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8
Q

this device is always most downstream and is an important part of compressor for medical

A

dryer

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9
Q

how many 2” pipe would it take to change from 6” pipe

A

2^2 = 4
6^2 = 36
so 36 / 4 = 9

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10
Q

shallow well pump can take max ___ft

A

25ft

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11
Q

piping downstream of reverse osmosis must be __

A

plastic, attached w air gap

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12
Q

max length of water system = ___m

A

90m

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13
Q

1) max residential water service pressure, prv needed if u go over this number
2) min is ____kpa

A

1) max. 550kpa (80psi)

2) min. 200kpa (30psi)

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14
Q

flared soft copper angle

A

45 degrees

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15
Q

the smell of poisonous rotten egg means

A

hydrogen sulphide

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16
Q

neutral ph

A

7

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17
Q

mildly acidic ph

A

6, below gets more acidic

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18
Q

mildy alkaline ph

A

8, above more alkaline

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19
Q

what removes iron

A

oxidation and manganese greensand

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20
Q

lowest amount of oxygen level to enter confined space

A

19.5%

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21
Q

what pipe cutting process is this: stay min 8” from beaded end, score pipe, then heat, tap. use stone to smooth rough end

A

cutting glass pipe, ends should be joined BEAD TO PLAIN

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22
Q

minimum size for water service pipe

A

3/4”

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23
Q

air gap minimum

A

1” or 2x diameter of potable water supply pipe

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24
Q

septic tank is inspected _____

A

annually

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25
Q

distance from septic field

  • drinking water =
  • property line or well with watertight casing =
A
  • drinking water 3m (10’)

- property line, well with watertight casing 30m (100’)

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26
Q

distance from septic ______
drinking water/building drain = 1m (3ft)
property line = 15m (50ft)

A

septic tank

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27
Q

2 boilers working together must have

A

their own components

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28
Q

pressure vacuum breaker is installed ____ inches above flood level

A

12”

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29
Q

rpba = min ____ in off ground

A

30inches off ground

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30
Q

device installed in the hot water supply main near the heating source, to separate and direct air to cushion tank or automatic air vent

A

air scoop

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31
Q

hot water boiler, minimum ___” relief valve with ___ psi, max temp _____ F

relief valve rating?

A

3/4” relief valve with 30 psi, max temp 250 degrees F

(note: low pressure steam boiler is half of these values)

100%relief valve rating

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32
Q

hard hat liners are changed every

A

year (annually)

note; class A has voltage protection

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33
Q

hard hats are valid for ___years

A

5

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34
Q

___ ft or more requires shoring

A

4ft

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35
Q

lanyard =

A

5ft

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36
Q

tap top of head

A

mainline

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37
Q

tap bottom of elbow

A

whipline

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38
Q

foresight is ____ elevation

backsight is ____ elevation

A

foresight is unknown

backsight is known elevation

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39
Q

to lengthen flushometer flush turn screw

A

clockwise

to shorten flush turn screw counter clockwise

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40
Q

1) to find max trap arm length multiply diameter” by __ , assuming 1/4”per foot grade
2) min. trap arm length?

A

1) 4

2) minimum length of trap arm is 2 pipe diameters

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41
Q

scaffolding required at ____ft

A

10

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42
Q

how many decibels until you need protection

A

85db

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43
Q

guardrails at

A

42 inches above working platform

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44
Q

t&p valves located within top _____mm of tank and temp rated at _____ deg C

A

150mm

temp rated at 99 deg celsius

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45
Q

purpose of a wild loop

A

prevents pump from dead heading

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46
Q

device installed above compression tank

A

line scoop

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47
Q

location of circulator

A

on the supply downstream from compression tank, flow switch comes after these

48
Q

circulator transfers energy by

A

impellers

49
Q

distance in feet x grade in fraction of an inch =

1m is 3.28f

A

total fall in inches

note: if TF and distance are in feet grade is in percentage

50
Q

H’ x 0.433 =

A

xPSI per feet of head

51
Q

area in sqin x psi =

A

TF, total force

52
Q

type of copper for baseboard heating

A

type M

53
Q

Formula for volume

A

d^2 x 0.7854 x h

exclude the h if u want to get area

54
Q

1 ton of refrigeration =

A

12,000 btu’s

55
Q

after cleaning a septic tank, as its refilling sludge(bottom layer) starts to rise, what is the problem

A

too little bacteria and undersized tank

56
Q

well pump turns on as soon as faucet is used, what is the problem

A

waterlogged pressure tank

57
Q

cold caulked joints in a drainage system should be packed w oakum and tightly caulked with cold caulking compound to a depth no less than ____mm

A

25mm(1”)

58
Q

dishwashing sink and food prep sink shall NOT have

A

concealed overflows

59
Q

dischrage piping from service water heater’s temp and prv must discharge within ____ of a floor drain or suitable area

also: underground piping installed in a dug trench should be covered with backfill to a heigh of ____

A

300mm

60
Q

if 4 shower heads are installed along a wall what would the min measurement be between the two outermost heads

A

3 spaces, each space is 750mm, so 750 x 3 = 2250mm

61
Q

a 4-wire zone valve is wired to

A

thermostat, transformer, end switches

62
Q

a twin tank water softener will house the brine in one tank and the other tank will house the ____

A

zeolite

63
Q

water that has a dissolved mineral content greater than 181 mg/L would be deemed

A

very hard

64
Q

reason why water is red after softener

A

insufficient backwash

65
Q

laterals in a septic field runs ____

A

level, no slope

66
Q

if trench walls are required to be slope, what is the slope

A

4:3
4 horizontal
3 vertical

67
Q

when pouring concrete in on in floor radiant heating pipe, what must be done to the pex

A

have air in the pex and pressurize it

68
Q

hydronic system that is the easiest to balance

first supply last return

A

reverse return system

69
Q

Max develop length of a fixture outlet pipe in Canada

A

1200mm

70
Q

min. size supply pipe to hwt serving 1 fixture

A

1/2”

if it serves 2 fixtures 3/4”

71
Q

class b fire extinguishers are used on what

d?
c?

A

flammable liquids

class d = metal 
c = electrical components
72
Q

what type of copper is used for underground water distribution

A

type k soft

73
Q

backwater valve installed on a building drain is normally ___

A

open

74
Q

a gear pump is a positive displacement pump and must be installed with a ___

A

pressure relief valve

75
Q

where is the jet located in a deep well

A

above the foot valve

76
Q

what formula is this ( (area of leader) + 0.5 (area of wall) ) x rainfall intensity

A

rw leader w wall in litres

77
Q

what formula is this: (length of pipe / 10) x what the graph says using temp change of xpipe

A

expansion

78
Q

changing cont flow to fixture units calculation?

to litres calculation?

A

xL/s x 31.7 = fu

xL/s x 900 = Litres

79
Q

which vents need a develop length from most distant soil or waste pipe connection

A

branch vent - towards a vent stack stack vent, vent header or outside air

vent header - towards outside air

80
Q

which vent need a develop length of the horizontal or vertical soil or waste pipe connection towards a stack vent vent, vent stack, vent header or outside air

A

circuit vent - horizontal

continuous vent - vertical

81
Q

length is not a consideration when sizing this vent

A

relief vent - one size smaller than circuit vent

82
Q

which manufacturing method produces the strongest pipe

A

extruded

83
Q

a ground source heat pump is installed (geothermal). what do u need in the boiler room

A

buffer tank

84
Q

what is it called when u pour concrete in stages

A

lifts

85
Q

what is required when u install a downfed hydronic fintube

A

vents on high points and drains on low points

86
Q

if u had to remove a toilet and then put it down again after u have raised the floor what would u use

A

wax horn or flange extension kit

87
Q

valves used on domestic hwt supply and heaters include

A

pressure, temperature and vacuum relief valve located within 6” above the tank

88
Q

min. radius for a bend of pipe

A

diameter x 6 = min radius bend

89
Q

when gluing 2 inch diameter or less pvc do u need primer

A

you dont need primer for 2inch or less pvc

90
Q

which pump voltage will provide the most energy efficiency

A

240 line voltage - voltage is high and it must be LINE voltage

91
Q

min floor drain size

A

2”

92
Q

what is blackwater

A

toilet only waste

93
Q

colour of non potable water piping

A

purple

94
Q

max trap length connector (tail piece) allowed when a fixture has a supply pipe of 3/8”

A

750mm

95
Q

air break minimum

A

1” min. or 1 x diameter of non potable pipe

96
Q

low pressure boiler minimum of ___” prv that discharge at ___psi. Max temp is ___

A

1/2”, 15psi, 250 degrees F

97
Q

what is the process when flaring copper

A

cut, ream, nut, flare

98
Q

discharge from a sump pump shall have the following fittings in order, in the direction of flow

A

check valve, union, shut off valve

99
Q

turning the adjusting screw CLOCKWISE on flush valve will

A

close the chamber and give u a longer cycle

COUNTERCLOCKWISE will shorten cycle and open chamber

100
Q

if flushvalve has continuous flow or the flush is too long it could be because

A

opening chamber is plugged or you have a ruptured diaphragm

101
Q

fixture unit is 260 or less, load is ____L

if it exceeds = # of fu x ___L = xL

A

2360L

9.1L

102
Q

hwt is set to ____F minimum , max hot water that discharge into drain is ____C

A

140 degrees F minimum, max is 99 deg C

75 degrees C to drain

103
Q

how to change xF to celsius and vice versa

A

(xF - 32) / 1.8 = xC

(xC x 1.8) + 32 = xF

104
Q

Max bath/shower hot water temp

A

49 degrees C or 120 degrees F

105
Q

flow control valve (check valve) is installed on ____, they prevent convection currents in a heating system

A

supply

106
Q

a zone valve installed backwards =

A

water hammer

107
Q

this device is downstream of the circulator, proves circulator is on and turn on the burner

A

flow switch

108
Q

the best location to get air out is where water velocity is ______ and temp _____

A

water velocity LOWEST

temperature HOTTEST

109
Q

this device is a lift check installed on the supply, upstream of the circulator and cuts off water until a call for heat

A

flow control

110
Q

sling configuration that lifts the most capacity

A

basket sling with 2 vertical legs

111
Q

minimum ground cover for underground gas piping

A

375mm

112
Q

when does a spring loaded inline trap primer deliver a spurt of water to the trap it is serving

A

when the faucet through which it is supplied is opened and closed

113
Q

correct installation of a thermal bulb (aquastat proportional controller) on a chilled water system

A

install in a thermal well with conductive paste

114
Q

downfed hot water unit heater requires 2 isolation valves, what are they

A

isolation valves for drain and air vent

115
Q

geothermal heat pump in residence requires ______ hwt that are gas or electric

A

domestic

Level 4 Plumbing (2 decks)

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