PLUMBING CODE II

Question 1

Consists of a body, a checking member, and an atmospheric opening.

Answer 1

Atmospheric Vacuum Breaker (AVB)

Question 2

consists of 2 independently acting internally or externally loaded check valves, 4 properly located test cocks with connectors, and 2 isolation gate valves

Answer 2

Double Check Valve Backflow Prevention Assembly (DC)

Question 3

consists of a loaded air inlet valve, an internally loaded check valve, 2 properly located test cocks, and 2 isolation gate valves.

Answer 3

Pressure Vacuum Breaker Backflow Prevention Assembly (PVB)

Question 4

consists of 2 independently acting internally loaded check valves, “a differential pressure relief valve”, 4 properly located test cocks, and 2 isolation gate valves.

Answer 4

Reduced Pressure Principle Backflow Prevention Assembly (RP)

Question 5

Hanger rod size for 5” pipe size

Answer 5

Correct answer: 13 mm (or 1/2”)
Source: Uniform Plumbing Code

Question 6

Hanger rod size for 1/2” to 4” pipe

Answer 6

3/8” rod size

Question 7

Hanger rod size for 5” to 8” pipe

Answer 7

1/2” rod size (12.70mm)

Question 8

Hanger rod size 10” to 12” pipe

Answer 8

5/8” rod size (15.88 mm)

Question 9

An additional cleanout shall be provided on a horizontal line with an aggregate offset angle of direction exceeding _____.

Answer 9

Correct answer: 135°
Source: RNPCP, Chapter 6

Additional info:
Cleanouts may be omitted on short horizontal drainage pipe installed at 72° or less from the vertical line

Question 10

AVBs of inlets to tanks, vats, sumps shall be installed in the discharge side of the _____ with the critical level not less than _____ above flood level rim.

Answer 10

Correct answer: last valve; 152 mm
Source: RNPCP, Chapter 6

Question 11

Every building where _____ shall have a sewer service connection to a public or private sewer systems.

Answer 11

Correct answer: plumbing fixtures are installed
Source: RNPCP, Chapter 3

Question 12

A standpipe having a remote control device at each hose station.

Answer 12

Correct answer: Manually-Operated Standpipe System
Source: RNPCP, Chapter 2

Question 13

Each tailpiece, continuous waste or waste and overflow shall not be less than ___ for sinks, dishwashers, laundry tubs bathtubs, urinals and similar fixtures.

Answer 13

Correct answer: 38 mm O.D.
Source: RNPCP, Chapter 4

Additional info:
- 32 mm O.D.- for lavatories, drinking fountains, and similar small fixtures

Question 14

Trap arm size of a service sink

Answer 14

Correct answer: 51 mm
Source: RNPCP, Chapter 7

Question 15

trap arm size for bathtubs, bidet, etc.

Answer 15

38 mm

Question 16

trap arm size for sand interceptors, flushing rim sink clinic, etc.

Answer 16

76 mm

Question 17

trap arm size of a dental unit or cuspidor

Answer 17

32 mm

Question 18

A run of 20 meters with a rise of 0.5 m corresponds to a slope of _____.

Answer 18

2.5%

Question 19

A device installed in a drainage system to prevent reverse flow.

Answer 19

Correct answer: Backwater Valve
Source: RNPCP, Chapter 2

Question 20

a valve that automatically closes to prevent the flow of liquid or gas in a reverse direction

Answer 20

Check Valve

Question 21

a valve opened and closed by the fall and rise of an attached ball floating on the surface of the liquid.

Answer 21

Ball Cock

Question 22

receives sewage or wastewater and below the normal grade of the gravity system

Answer 22

Sump

Question 23

What is the allowed depth of shower dam or threshold?

Answer 23

Correct answer: 2”-9”
Source: RNPCP, Chapter 4

Question 24

Threads per inch of a 64 mm cleanout size

Answer 24

Correct answer: 8 Threads per inch (TPI)
Source: RNPCP, Chapter 7

Question 25

Threads per inch of a 38 to 51 mm cleanout size

Answer 25

11-1/2 Threads per Inch (TPI)

Question 26

The discharge capacity of 1 to 1.89 lps corresponds to _____.

Answer 26

Correct answer: 4 FU Source: RNPCP, Chapter 7

Question 27

Clothes washers in groups of 3 or more shall be rated at _____ each for the common horizontal and vertical waste pipe sizing.

Answer 27

Correct answer: 6 FU Source: RNPCP, Chapter 7

Question 28

The public sewer may be considered not being available when a sewer is located more than _____ from any proposed building or exterior drainage facility.

Answer 28

Correct answer: 61 m Source: RNPCP, Chapter 12

Question 29

maximum distance between manholes

Answer 29

91 m

Question 30

A fixture allowed to omit a cleanout on a horizontal line less than 1.5 m in length is _____.

Answer 30

Correct answer: Bathtub Source: RNPCP, Chapter 7

Question 31

Cleanouts may be omitted on a horizontal drain line less than 1.5 m in length unless such line is serving _______.

Answer 31

sinks or urinals

Question 32

What is the maximum fixture loading of a 8" pipe sloped at 1%?

Answer 32

Correct answer: 2112 Source: RNPCP, Chapter 7 Additional info: For 1% slope, multiply horizontal fixture units by a factor of 0.8.

Question 33

Preferred pipe for transporting gas

Answer 33

Correct answer: Black Steel Pipe Source: hu-steel.com; buyfittingsonline.com; not suitable for water because it tends to erode more easily

Question 34

suitable for water supply in old houses

Answer 34

Galvanized Pipe

Question 35

suitable for sanitary, storm sewers, and culverts

Answer 35

Concrete pipe

Question 36

suitable for drainage

Answer 36

Cast Iron Soil Pipe

Question 37

1 Kcal is how many BTU?

Answer 37

Correct answer: 3.965 (standard conversion) Additional info: - 1 Kcal = 4184 Joule - 1 Kcal = 4.184 KJoule

Question 38

Vertical installation of double sanitary tees may be used when the barrel of the fitting is at least _____ larger than the _____ inlet.

Answer 38

Correct answer: 2 pipe sizes; largest side inlet Source: RNPCP, Chapter 3

Question 39

The transference of heat by the upward movement of a warm light air current.

Answer 39

Correct answer: Convection Source: Audel

Question 40

the process in which energy in the form of heat is sent through space from atoms and molecules as they undergo internal change.

Answer 40

Radiation

Question 41

the transference of heat by the passage of energy, particle by particle.

Answer 41

Conduction

Question 42

the process by which a solid holds molecules of a gas or liquid or solute as a thin film.

Answer 42

Adsorption

Question 43

What will happen if a drainage piping is placed at slope of 10mm/m due to structural conditions?

Answer 43

Correct answer: Decrease in DFU loading Source: RNPCP, Chapter 7 Additional info: - 1% slope will require lesser DFU loading - If using 1% or 10mm/m slope, multiply the allowable DFU of horizontal drain stated in Table 7-5 by a factor of 0.8 - drainage slope does not affect length

Question 44

Which of the following can be drained through an air break?

Answer 44

Correct answer: evaporative cooler Source: RNPCP, Chapter 8 Additional info: - all food equipment such as cold storage room, refrigerator, cooling counter, compartment for storage or holding of food or drink, dishwashing or culinary sink must discharge through an airgap

Question 45

Joints for hubless cast iron soil pipe and fittings shall conform to appropriate _____ installation standards.

Answer 45

Correct answer: IAPMO (International Association of Plumbing & Mechanical Officials) Source: RNPCP, Chapter 13

Question 46

Medical gas piping is most often joined by _____.

Answer 46

Correct answer: silver brazing Source: plumbinghelp.com

Question 47

a process in which two or more items are joined by melting and putting a filler metal (solder) into the joint

Answer 47

Soldering

Question 48

A mechanical connection which depends on an internal retention device to prevent pipe or tubing separation

Answer 48

Pressure-lock type

Question 49

common joint for PPR (Polypropylene Random Copolymer)

Answer 49

Heat fusion

Question 50

Copper tubing shall be fully externally protected with a/an _____ and fiberglass wrapping installed inside a split rigid casing whenever installed underground.

Answer 50

Correct answer: bitumastic coating Source: RNPCP, Chapter 6

Question 51

protection from breakage for piping passing under or through walls

Answer 51

Embedded metal pipe sleeves

Question 52

protection from external corrosion for pipes passing through or under cinders or other corrosive materials

Answer 52

Polyethylene sheath

Question 53

for voids between pipes and sleeves through concrete floors in the ground

Answer 53

Bitumen

Question 54

for pipes directly embedded in concrete and masonry walls

Answer 54

Metal sleeve

Question 55

Limit stops shall be adjusted to deliver hot water with a maximum temperature of _____.

Answer 55

Correct answer: 120°F (or 48.88 °C) Source: RNPCP, Chapter 4

Question 56

Operating temperature of a backflow prevention for hot water

Answer 56

43.3°C (or 110°F)

Question 57

How many fixture units is equivalent to a 30 gpm-rated sump?

Answer 57

Correct answer: 60 FU Source: RNPCP, Chapter 7; Uniform Plumbing Code, Chapter 7 Additional info: - Two FU shall be allowed for every 0.063 L/s of flow, or 1 gpm.

Question 58

1 Laundry Tray must be provided per ____ persons.

Answer 58

Correct answer: 50 Source: RNPCP, Chapter 4

Question 59

Galvanized wrought iron or galvanized steel pipe shall be kept _____.

Answer 59

Correct answer: 150 mm above ground Source: RNPCP, Chapter 9

Question 60

pipes must be kept 300 mm below ground

Answer 60

Vitrified clay

Question 61

A double check valve backflow preventer requires _____ minimum clearance at the bottom for maintenance.

Answer 61

Correct answer: 305 mm Source: RNPCP, Chapter 6

Question 62

Airgap less than 25 mm shall only be approved as a permanent part of a listed assembly that has been tested under actual backflow conditions with vacuums from _____ of mercury.

Answer 62

Correct answer: 0 to 63.5 cm Source: RNPCP, Chapter 6

Question 63

What is the Maximum DFU loading of a 102 mm branch?

Answer 63

Correct answer: 216 (for Branch or Horizontal Pipe) Source: RNPCP, Chapter 7

Question 64

Maximum DFU loading for 102 mm Stack (or vertical pipe)

Answer 64

256

Question 65

Maximum DFU loading for 600 mm Stack (or vertical pipe)

Answer 65

600

Question 66

Maximum DFU loading for 152 mm Stack (or vertical pipe)

Answer 66

1380

Question 67

Water Closet provision for 300 females in Assembly Places for Public Use

Answer 67

Correct answer: 11 Source: RNPCP, Chapter 4

Question 68

Thickness of Continuous waste and fixture tailpiece- seamless drawn brass

Answer 68

Correct answer: Gauge 20 (0.8 mm) Source: RNPCP, Chapter 4

Question 69

Thickness of copper pans or liners for shower subpans

Answer 69

Gauge 24 (0.5 mm)

Question 70

thickness of restaurant kitchen and other special-use sinks, bonderized and galvanized sheet steel

Answer 70

Gauge 16 (1.6 mm)

Question 71

thickness of galvanized sheet metal for downspout or conductor

Answer 71

Gauge 26 (0.47mm)

Question 72

Backflow prevention device for a hose bibb

Answer 72

Correct answer: Atmospheric Vacuum Breaker (AVB)- consists of a body, a checking member, and an atmospheric opening Source: RNPCP, Chapter 6

Question 73

WSFU of a private hose bibb

Answer 73

Correct answer: 3: WSFU of Public Hose Bibb or Sill Cock Source: RNPCP, Chapter 6

Question 74

WSFU of Public Hose Bibb or Sill Cock

Answer 74

5

Question 75

WSFU of Water Closet (economical flush)

Answer 75

2.5

Question 76

WSFU of Urinal pedestal, flushing rim sink

Answer 76

10

Question 77

Linings for showers shall not be nailed or perforated at any point less than _____ above the finished dam or threshold.

Answer 77

Correct answer: 1" or 25.4 mm Source: RNPCP, Chapter 4

Question 78

dimension that refers to extension of lining materials above the top of the finished dam or threshold of a shower

Answer 78

76 mm (or 3")

Question 79

dimension that refers to extension of folds, laps, and reinforcing webbing in all directions from the corner in a shower sub-pan

Answer 79

101 mm (or 4")

Question 80

A _____ diameter circular basin shall be equivalent to 1 lavatory.

Answer 80

Correct answer: 457.2 mm Source: RNPCP, Chapter 4

Question 81

refers to the width of a circular basin that shall be considered equivalent to 1 lavatory

Answer 81

609.6 mm

Question 82

What is the minimum supply size for a urinal stall?

Answer 82

Correct answer: 19 mm Source: Annex A

Question 83

All reinforcing webbing shall produce a tensile strength of not less than _____ in either direction.

Answer 83

Correct answer: 0.9 kg/mm Source: RNPCP, Chapter 4

Question 84

Color of Steam Division- High Pressure Pipe

Answer 84

Correct answer: White Source: National Building Code Rule X (Old NBC) Additional info: - Amended NBC has a different color for High Pressure Steam (Yellow). The answer might depend on the choices given. Most probably, the examiner will base on the old NBC since the questions are included in a Question Bank.

Question 85

Color of Steam Division- Exhaust System

Answer 85

Buff

Question 86

Each pressure relief valve shall be an approved automatic type with drain and set at a pressure not more than _____.

Answer 86

Correct answer: 1033 kpa (or 150 psi) Source: RNPCP, Chapter 6

Question 87

Threads per inch for pipe size of 13 mm diameter.

Answer 87

Correct answer: 14 Threads per Inch (TPI) Source: engineeringtoolbox.com

Question 88

Threads per inch for Pipe size of 1/4" to 3/8" ( 6.35mm to 9.525mm)

Answer 88

18 Threads per Inch (TPI)

Question 89

Threads per inch for Pipe size of 1" to 2" (25.4mm to 50.8mm)

Answer 89

11-1/2 Threads per Inch (TPI)

Question 90

Threads per inch for Pipe size of 2-1/2" and above (63.5mm and above)

Answer 90

8 Threads per Inch (TPI)

Question 91

Potable water shall use solders and fluxes with a lead content not exceeding _____.

Answer 91

Correct answer: 0.2% Source: RNPCP, Chapter 13

Question 92

"maximum lead content allowed" in water pipes and fittings

Answer 92

8%

Question 93

A pressure regulator must be installed if the local water service pressure is above ____

Answer 93

Correct answer: 80 psi (or 551 kpa) Source: RNPCP, Chapter 7

Question 94

this refers to the minimum water pressure, otherwise a tank or a booster pump must be installed

Answer 94

103 kpa (or 15 psi)

Question 95

Trap arm size of Laundry Tub

Answer 95

Correct answer: 38 mm Source: RNPCP, Chapter 7

Question 96

trap arm size of wash basin (lavatory) single, dental units or cuspidor

Answer 96

32 mm

Question 97

trap arm size of floor drains, grease interceptors, showers, etc.

Answer 97

51 mm

Question 98

trap arm size of water closet

Answer 98

76 mm

Question 99

Water pipe joints shall be installed not less than ___ away from sewer line in both directions.

Answer 99

Correct: 3 m Source: RNPCP, Chapter 12

Question 100

Changes in direction of drainage piping shall be made by the use of approved pipe fittings like the following, except for _____.

Answer 100

Correct answer: 90 degrees Source: RNPCP, Chapter 3

Question 101

Voids between pipes and sleeves through concrete floors in the ground shall be appropriately sealed with _____.

Answer 101

Correct answer: Bitumen Source: RNPCP, Chapter 3

Question 102

protection from breakage for piping passing under or through walls

Answer 102

Embedded metal pipe sleeves

Question 103

protection from external corrosion for pipes passing through or under cinders or other corrosive materials

Answer 103

Polyethylene sheath

Question 104

for voids between pipes and sleeves through concrete floors in the ground

Answer 104

Bitumen

Question 105

for pipes directly embedded in concrete and masonry walls

Answer 105

Metal sleeve