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Plumbing Year 4 > Plumbing RD & TQ > Flashcards

Plumbing RD & TQ Flashcards

1
Q

theoretical lift is 12.75 psi, How many feetof head is this?

A

29.44ft/h

12.75 X 2.31 or 12.75/.433

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2
Q

what decides the speed of the drill?

A

type of material

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3
Q

what is the standard cut in/cut out of a pump?

A

30/50

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4
Q

What is the purpose of the compound wrench?

A

More leverage

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5
Q

What is the 1/4inches tap hole on the top of a well casing?

A

vent

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6
Q

1.6m offset with 2 90’s, if you use 2 45’s, how much pipe will you save?

A

2 x 1.6= 3.2
1.414 x 1.6 = 2.2

you’ll save 1

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7
Q

Medical copper pipe should be?

A

degreased and capped

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8
Q

Who would be involved for testing gas piping?

A

CSA

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9
Q

What is the trap size of the three compartments sink?

A

2”

1 1/2” outlet pipe, 2” trap, 2 fus

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10
Q

Minimum vertical pipe drop allowed on a toilet?

A

1000mm

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11
Q

What kind of knot is used for a tag line?

A

Bowline

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12
Q

What is the minimum size of a sump vent when the sub building drain
is 2”?

A

2”

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13
Q

Where is the vacuum breaker on a mop sink?

A

Integral part of the
faucet

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14
Q

The best protection for cross-connection at the marina?

A

RPBA

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15
Q

If water is coming out of the atmospheric port of a RPBA, what is happening?

A

High demand downstream or the second check is partially kept
open because of debris

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16
Q

If the fire pin on powder actuated tool is defective, what to do?

A

Put it out of service and get it fixed by approved technician

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17
Q

What is the layer of scum for in a septic tank?

A

insulation

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18
Q

If there were a small amount of scum in the tank, what would cause
it?

A

Large amount of soap and detergent used

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19
Q

What kind of pump is used from the tank, to the field?

A

centrifugal

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20
Q

Flow control valve in front of the grease interceptor, what is it
for?

A

Reduce flow

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21
Q

If pump looses pressure without any demand( opening of a faucet ), what is it?

A

Foot valve is leaking

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22
Q

Water hammer occurs in a residential house with quick closing
valve, what should be done?

A

reset shock arrestors

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23
Q

Suction pipe is 1 ¼, what is the drive line size?

A

1”

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24
Q

Minimum size for a water supply on a water softener?

A

3/4”

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25
Q

Minimum water pipe for a tub?

A

½”

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26
Q

when is the t&p valve is going to open on a HWT?

A

at max working pressure

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27
Q

Best and fastest way to test cast iron fittings?

A

tap with hammer

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28
Q

What is the 90 degree at the end of a sump tank for?

A

Discharge the
clearest effluent in the effluent chamber

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29
Q

What is the advantage of a two pipe lines drawing compare to a
single line drawing?

A

easier to interpret

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30
Q

How do you find canning sleeve after the concrete as been poured?

A

grid lines

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31
Q

Where there is a change from cast iron or copper to abs stack going
from one floor to another, what do you need?

A

expansion joint

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32
Q

Max. size of pipe that can be hung with strapping?

A

4”

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33
Q

What do you use a spiral reamer for?

A

Burrs on the inside of pipe

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34
Q

At what depth do you need shoring?

A

1.5m or 5 feet

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35
Q

if you have a 6” stack and a 3” vent stack connected by a relief
vent, what is the size of the relief vent?

A

2 1/2”

Relief vents are 1 size smaller then the vent stack

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36
Q

What type of solder on a extracted tee?

A

brazed

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37
Q

Why do you put a sacrificial anode in the ground right beside the other pipe?

A

for cathodic protection

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38
Q

From what do you have to protect two dissimilar metal like copper
pipe with metal hanger?

A

dialectic union

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39
Q

What kind of wrench do you use with chrome finish?

A

strap wrench

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40
Q

Minimum water supply size for a urinal for a direct flush valve?

A

3/4”

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41
Q

Minimum length of a 4” floor drain?

A

18”

42
Q

Where would you have shut-off valve in a public building?

A

At every
fixture or a group in the same room

43
Q

What would most likely be the problem if water was ( slowly )
constantly running into the bowl of a water closet if the level in the
tank is ok?

A

flapper is leaking

44
Q

Maximum temperature allowed in a drain?

A

75 deg C

45
Q

What type of screw do you use to bolt down a water closet?

A

brass T bolt

46
Q

How do you make sure that you have a space in between the wall hung
w.c. and the wall?

A

back up nut and washer

47
Q

What must be indirectly connected to the drainage?

A

sterilizer

48
Q

can you repair a broken chain

A

no

49
Q

If one zone in a house is not getting heat, what causes it?

A

check the end and flow switches

50
Q

If the boiler is down the main floor and the heating unit upstairs
is not giving heat and the main floor is ok( having lots of heat),
what’s the problem?

A

air in unit

51
Q

Why would it be detrimental to potable water to store it after it
is being treated buy a reverse osmosis?

A

acidic

52
Q

Which of the system would have the most equal piping in every zone? Which of the system would have the most equal piping in every zone?

A

Reverse return

THIS IS ALWAYS BEST
ANSWER

53
Q

Hose bibb faucet needs to be frost free with a stop and drain
inside the building

A

NO answer just staement

54
Q

If you lack of pressure on a flush valve, what do you do?

A

open the shut off valve more

55
Q

how do you test water system?

A

700kpa for 2 hrs with potable water

700kpa = 100psi sodt

56
Q

What type of waste does a floor drain receives when connected to a
storm system?

A

clear waste water

57
Q

If a trap if being siphoned, what would you check first?

A
58
Q

What kind of equipment do you need to test a cross connection
device?

A
59
Q

what regulates flush times on a flush tank?

A

Fill valve

60
Q

If the flush tank always lets thru a little bit of water, what is
the problem?

A

Siphon is cracked

61
Q

what do you regenerate green sand manganese filter with

A

potassium permanganate

62
Q

what is the minimum sump vent size?

A

2”

63
Q

what prevents a wet stand pipe from freezing?

A

glycol and RP

64
Q

what size is a fire hydrant’s vent taping?

A

1/8”

65
Q

where is the take off for a sprinkler system?

A

between meter and main valve

66
Q

what are the two product used to degreased an med pipe:

A

TSP

67
Q

four people in a house, how many gallons consume?

A

4 x 60L = 240 gal

68
Q

min. size for water supply to a urinal tank?

A

1/2”

69
Q

min pipe size for med gas is

A

1/2” type K and L

70
Q

what does the fill valve regulate?

A

flush cycle

71
Q

what does a chemical feed filter need?

A

siphonage device

72
Q

if pressure switch contact are closed and the power is there, why
is the pump not working?

A

Over load protector tripped

73
Q

what is install on a centrifugal pump to prevent the water from
draining down?

A

check valve

74
Q

prison toilet:

A

one piece stainless steel

75
Q

what kind of toilet does a public washroom need

A

a siphon toilet with open seat

76
Q

F.F.D.

A

funnel floor drain

77
Q

U.T.R

A

up through roof

78
Q

how does a Siamese fitting work?

A

fireman hooks up a hose to it to boost
the pressure for the sprinkler system

79
Q

what can you add to lower the PH of water?

A

neutralizing filter

80
Q

bridging on the brine tank:

A

break the salt down and lower the
feed

81
Q

salty water after regeneration why?

A

too short a rinse cycle

82
Q

what happens during a regeneration cycle in a water softener?

A

sodium are replacing calcium and magnesium

83
Q

what kind of carrier does a vertical soil pipe for toilet need?

A

in line vertical carrier

84
Q

is copper allowed on urinals?

A

no

85
Q

what does a pressure balancing valve do

A

prevents scalding

86
Q

FU (Fixture unit loads) Information

Bathroom group with flush tank 6

Bathroom group with direct flush 8

Bath tub 1.5

Bidet 1

Floor drain 2 with 2” Trap

3 with 3” Trap

Kitchen sink 1.5

Urinal pedestal 4

Stall 2

Washout 1.5

WC Flush tank 4

WC Direct flush 6

A
87
Q

what must be carefully selected when five loops in your floor heating system?

A

Header size

88
Q

Maximum Loop length for 3/8,1/2, 5/8, and 3/4”

A

3/8 250 ft
½ 300 ft
5/8 400 ft
¾ 500 ft

89
Q

according to B214-01 what is the max floor temperature for in floor heating
system?

A

88 deg F

90
Q

What can be used under R.P.H to stop heat loss under concrete floor?

A

R5 rigid insulation

91
Q

hree way valve in a system mix how does it work?

A

Same as a 4 way valve with less flow back to the boiler, and will not protect against low return water temp.

92
Q

Where wouldn’t you place pex in an infloor system?

A

Within 6” of the walls, food
storage, refrigerators, toilets

93
Q

Heat Loss

A

SA x Delta T x U factor

94
Q

Get formula for hemispehrical tank volume in metric and weight in KG

A

V=(pi x r2 x l or H) + 1.33 x pi x r2

95
Q

Urinals info

A

3 Gallon tank has a maximum of 3 Urinals installed

5 Gallon tank has a maximum of 5 Urinals installed

Solenoid connected to either a timer or motion
sensor can be installed of the supply piping to help conserve water

Trouble shooting
If it will not flush check supply water

Running constantly check siphon tube for damage

96
Q

Hot water NUmbers

A
  • 120F to a fixture Maximum
  • 140F Hot water tank Minimum
  • 110F Recommended
  • 104-107 F Typical bathing temperature

Legionnaires disease can be caused running tank temp below 140 F

97
Q

drinking fountain rules for swimming pools

A

1 Drinking fountain is required at all public swimming pools
Drinking fountain shall be recessed and placed at the shallow end of
the pool.

98
Q

Atmospheric Vacuum Breaker

A

-6” Above point of use
-Protects against minor or moderate hazards
-Protects against back siphonage only

99
Q

Double Check Valve Assembly

A

-Protects against back siphonage and back pressure
-DCVA requires 36” clearance for testing

100
Q

Dual Check Valve

A

-Minor hazards
-Residential applications
-Premise isolation
-Lawn irrigation
-Inlet side of water softener to ensure filter media doesn’t enter city water
supply.
-Control against back pressure and back siphonage

101
Q

When you use an air test on a water distribution system, it requires a duration of ________ hours
at a pressure of ______ PSI

A

2 hrs / 100

Plumbing Year 4 (28 decks)

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