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Plumbing Year 4 > Red seal 2 > Flashcards

Red seal 2 Flashcards

1
Q

The waste for the closed coupled tank type W.C. is roughed in at:

A

305 mm (12”) from finished wall

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2
Q

A blowout W.C. cannot be:

A

horizontally wet vented

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3
Q

A floor drain can be protected from back-flow by a:

A

Gate valve or screw cap

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4
Q

the minimum distance between two shower heads is:

A

750mm (30”)

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5
Q

A relief vent is most closely related to a:

A

vent stack

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6
Q

not more then ____ shower heads can be served by one floor drain:

A

6

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7
Q

A yoke vent is required when the soil or waste stack extends through a number of storeys (11). an additional circuit vent also is required when:

A

more than 8 fixtures are installed between two vents.

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8
Q

the minimum air break for an indirect waste pipe that is 1 1/4” is:

A

1 1/4”

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9
Q

which does not require a vent?

A

trap forming part of an indirect drainage system OR trap on a subsoil drainage system

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10
Q

A trap on a building sewer serving a mobile home would have:

A

a 4” trap and a 3” vent AND traps required for un-certified mobile homes

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11
Q

Water supply used to flush holding tanks at a trailer dumping station would:

A

have a non-potable water sign AND have a back flow preventer

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12
Q

A storm drain connected to a combined sewr requires a trap if the roof:

A

is used for a sun deck

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13
Q

A trap is required for sub-soil drainage pipe if:

A

it drains into a sanitary sewer

stops smelly gas

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14
Q

the waste extension on a chair carrier is adjustable by adjusting:

A

four different wall thickness measurements

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15
Q

the flow from a pump or semi-continuous appliance into a storm drainage system is taken as:

A

1L/s =900L

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16
Q

A flat roof is 11m long and 20m wide, with an adjacent wall that is 14m long and 9m wide. what size RWL is required (20mm in 15 minutes)?

A

4” LEARN THE MATH AGAIN

AOR x RAINFAll = HL

then check on chart 2.4.10.11. for vertical and 2.4.10.9. for horizontal.

if there is an adjacent wall take HALF the area and add it to the TOTAL AREA.

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17
Q

ON a wall hung water closet, the distance from the face of the wall to the bowl is set by:

A

Back up nuts and washers

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18
Q

in order to size the drained portion of a relief vent, ie two lavs draining into the relief vent) the relief vent should be:

A

Sized by the wet vent table.

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19
Q

every grease interceptor that serves as a trap must have a water seal of at least:

A

1 1/2” (40mm)

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20
Q

the minimum size of water distribution pipe in a building is:

A

1/2”

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21
Q

the minimum protection used when incorporating a pre-rinse sink would be:

A

an AVB (atmospheric vacuum breaker)

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22
Q

every oil interceptor shall be provided with vents that:

A

Extend independently to open air

connect the interceptor at opposite ends

terminate at elevations differing by no less than 300mm (12”).

minimum size not less than 1 1/4”

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23
Q

A Clean out for a trap that serves a leader or subsoil drain is installed:

A

Over the trap, and upstream of flow.

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24
Q

one trap may serve a group of floor drains, showers or laboratory sinks provided that all fixtures:

A

are in the same room

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25
Q

an indirectly connected fixture must have a(n):

A

air break

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26
Q

a sanitary tee, when installed on the horizontal may:

A

be used to connect dry vents. NO DRAINAGE OR WET VENTING

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27
Q

the max number of flushometer water closets that can discharge into an 80mm (3”) stack from any one floor is:

A

3

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28
Q

how many RWLs are required for a 900m2 roof that uses roof controlled roof drains RI is 20mm per 15 minutes.

A

2

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29
Q

Every fixture that serves as a trap in an acid waste system must have a water seal of at least:

A

2” (50mm)

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30
Q

all waste openings that serve a three compartment kitchen sink are 1 1/2”. what is the minimum size of the trap?

A

2”

with a hydraulic load of 2 FUs

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31
Q

a service sink is installed with a:

A

3” S trap satndard

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32
Q

what is required when installing long, straight horizontal or vertical runs of copper domestic hot water pipping?

A

Expansion joints

33
Q

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

A

Downstream of the pressure regulator

34
Q

what determines the minimum size of the suction pipe of a well pump?

A

size of the discharge opening in the pump

35
Q

what is installed inside a grease interceptor to make it more efficient?

A

Flow control orifice plate

36
Q

what applies when installing a single trap for multiple shower drains?

A

All drains are located in the same room

no organic matter can be received by the trap and the trap has a clean-out

37
Q

a 1 1/2” circuit vent is serving a branch with eleven WCs connected to it. A relief vent is located downstream of the most downstream WC. if an additional circuit vent is required, where could it be connected to the branch?

A

Between the fifth and sixth upstream WCs

splitthe difference pur it in the middle

38
Q

two back to back water closets are roughed in at 254mm (10”) from the finished walls. if the partition is 125mm (5”) hollow tile and the wall finish is 189mm (3/4”) plaster what is the c-c distance on the sleeves?

A

671mm DO THE MATH

39
Q

when fixtures are horizontally wet vented, where must the continuous vent be connected?

A

between the two most upstream fixtures.

40
Q

on private domestic water systems, what would the usual cut-in and cut-out pressures be set at?

A

207 kPa (30psi) / 345 kPa (55psi)

41
Q

an underground water service is installed using thrust blocks. what additional method could be used to restrain the joints?

A

continuous rodding

42
Q

A cold water pipe is offset 1.2m using 45 degree elbows. What is the approximate length of the diagonal pipe?

A

1.2m x 1.414 = 1.7m

43
Q

what equipment is required if E coli is detected in the water?

A

Chlorinator

44
Q

which fixtures and appliances must be installed with a shut off valve in a public washroom?

A

All fixtures and appliances

45
Q

which type of trap is required when installing a standard close- coupled WC?

A

integral

46
Q

what would be the result of a partially plugged bypass orifice in a flushometer?

A

Long flush cycle

47
Q

what is the principal function of the expansion tank in a hot water system?

A

it allows the volume of water in the system to change while maintaining water pressure

48
Q

a heating system requires an in-line flow switch. where would this type of switch be located?

A

supply main

49
Q

when a gas line passes from one building to another, where is it necessary to install a gas cock?

A

the exit and entry points of each building

50
Q

what is the manufacturer’s recommended maximum length of 3/4” heat pex tubing in a radiant heat loss floor system?

A

500ft

51
Q

what type of heating system incorporates a Venturi tube?

A

one pipe system or a mono flow system

52
Q

what size condensing unit would be required for a building with a heating load of 54,000 BTUh?

A

4.5 ton WHY?

53
Q

the finned baseboard in a hydroponic heating system heats the room by means of:

A

convection

54
Q

where would you install a balancing valve in conjunction with a centrifugal pump?

A

either downstream of the pump OR outlet of the pump

55
Q

A wall 10ft x 16ft has a combined R value of 5.89/ft3. calculate the heat loss through the wall if your IDT is 70 degrees F and your ODT is 5 degrees F?

A

1768 BTUh . REVIEW MATH

56
Q

REVIEW GAS METER READING

A
57
Q

A 0.5ft3 test dial on a natural gas meter clocked 3 minutes 49 seconds for three revolutions would indicate an appliance input of:

A

3600secs/hr/ sec/revolution = rev/hr x ft3/rev = ft3/hr x calorific value = BTUh

229sec/3= 76.3

3600/76.3= 47.2x.0.5ft3 (dial) =23.6ft3/rev x 1000 CV = 23,600BTUh

58
Q

What would be the best type of heat transfer system for a basement in a house with a boiler, located in an area with a high water table?

A

Hydronic baseboard heat

59
Q

LOOK UP HOW TO SIZE GAS PIPING SYSTEMS

A

Questions 60 - 63 on RS2

60
Q

what type of safety device is required by code on a low mass boiler?

A

flow switch AND safety relief valve

61
Q

what is the maximum setting on a safety relief valve on a boiler with a working pressure above 60 psig?

A

110% of maximum working pressure

62
Q

what is the required flow of a pump installed in a house with a heat loss of 130 MBH with a design supply temp of 200 degrees F and a design return temp of 170 degrees F?

A

8.67 GPM

REVIEW PUMP SIZING AND FLOW RATES

63
Q

what may untreated water cause in hydronic heating systems?

A

Ferrous materials to oxidize

64
Q

a loose wire on a aquastat may:

A

prevent the main burner from firing

65
Q

what is the recommended floor surface temp in a building where the occupants will be standing for long periods of time?

A

77 F (25 C)

66
Q

what causes an occupant in a room to feel cold when the air temp is 70 F

A

cooler surrounding objects rob heat from peoples bodies

67
Q

a chemical pot feeder is the most common way to add glycol to a small system that is completely filled with glycol/water solution:

A

True

68
Q

What is the minimum height of a gas unit heater installed in a commercial garage?

A

8ft

69
Q

when possible, the best location for the primary circulator on a hydronic heating system is:

A

downstream of a diaphragm expansion tank

70
Q

what type of thermostat is used on a hydronic heating system?

A

thermostat w/o a heat anticipator

71
Q

what function does a 3 way or 4 way valve perform in a hydronic heating system?

A

mixes water from the heat source and the system return to produce the desired system supply water temp

72
Q

How many roof drains per each 900m2 of area

A

1

73
Q

Grade conversions.

A

1 in 100 = 1/8” = 1%
1 in 50 = 1/4” = 2%

74
Q

What is the minimum size for a sewage holding tank?

A

4500L (1000 imp. gal)

75
Q

How are septic systems sized?

A

of bedrooms

76
Q

a sewage holding tank lid and septic tanks lids must be:

A

be water and air tight AND must weigh 60 lbs OR be locked Or require a tool to access

77
Q

The minimum grade on a 3” drainage pipe is:

A

¼” per foot (2%)

78
Q

The minimum rate of flow in a building sewer is:

A

2’ per second

79
Q

A fixture unit is a design factor for a drainage system. One fixture unit is equal to:

A

6.25 imp gallons drained into an 1 ¼” pipe over 1 minute

Plumbing Year 4 (28 decks)

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