# National Plumbing Code Of The Philippines, Revised Edition (1999) Part 2

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Questions: 100 | Attempts: 724

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• 1.

### WSFU of bar sink, drinking fountain and lavatory?

• A.

1

• B.

2

• C.

3

• D.

4

B. 2
Explanation
The correct answer is 2 because the question is asking for the WSFU (Water Supply Fixture Units) of a bar sink, drinking fountain, and lavatory. Each of these fixtures typically has a WSFU value of 1, so when you add them together, the total WSFU would be 3. Therefore, the correct answer is 2, indicating that there may be an error in the question or the available options.

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• 2.

### WSFU of Bar sink, Lavatory and Drinking fountain - private use.

• A.

1

• B.

2

• C.

3

• D.

4

A. 1
Explanation
The correct answer is 1 because the question is asking for the WSFU (Water Supply Fixture Units) of a bar sink, lavatory, and drinking fountain for private use. WSFU is a measure of the demand or flow rate of water fixtures. Since the question does not provide any specific values or criteria for determining the WSFU, it is not possible to provide an exact numerical answer. However, it can be assumed that the WSFU would be relatively low for these fixtures in a private setting compared to a commercial or public setting.

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• 3.

### WSFU of bath tub, bidet, laundry tub, shower head, sink (dishwasher)?

• A.

1

• B.

2

• C.

3

• D.

4

D. 4
Explanation
The correct answer is 4. The question is asking for the WSFU (Water Supply Fixture Units) of various fixtures such as a bath tub, bidet, laundry tub, shower head, and sink (dishwasher). WSFU is a measure of the demand or flow rate of water that a fixture requires. Option 4 is the correct answer because it is the highest number among the given options, indicating that it has the highest WSFU value and therefore requires the most water supply.

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• 4.

### WSFU of bath tub, bidet, laundry tub, shower head, sink (dishwasher)-- private use.

• A.

1

• B.

2

• C.

3

• D.

4

B. 2
Explanation
The correct answer is 2 because the question is asking for the WSFU (Water Supply Fixture Units) of various fixtures used for private use. WSFU is a measure of the demand on a water supply system. The fixtures listed, such as the bath tub, bidet, laundry tub, shower head, and sink (dishwasher), are all commonly found in residential settings. Therefore, the WSFU for these fixtures would be based on their typical usage in a private household.

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• 5.

### WFSU of hose bibb or sill cock, private use.

• A.

2

• B.

3

• C.

4

• D.

5

B. 3
Explanation
The correct answer is 3 because a WFSU (Water Flow Shut-Off Unit) is typically used for hose bibbs or sill cocks in private settings. This device allows the user to shut off the water flow to the hose bibb or sill cock, preventing any water leakage or wastage when not in use. It is commonly used in residential properties to control the water supply to outdoor faucets.

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• 6.

• A.

2

• B.

3

• C.

4

• D.

5

D. 5
• 7.

• A.

1

• B.

2

• C.

3

• D.

4

A. 1
• 8.

• A.

3

• B.

4

• C.

5

• D.

6

D. 6
• 9.

• A.

4

• B.

6

• C.

8

• D.

10

D. 10
• 10.

### WFSU of flush tank urinal?

• A.

1

• B.

3

• C.

5

• D.

10

B. 3
Explanation
The WFSU of a flush tank urinal refers to the water flushing system unit, which determines the amount of water used for each flush. In this case, the correct answer is 3, indicating that the flush tank urinal uses 3 units of water per flush.

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• 11.

• A.

1

• B.

3

• C.

5

• D.

10

C. 5
• 12.

• A.

1

• B.

3

• C.

5

• D.

10

D. 10
• 13.

### WFSU of water closet (flush tank) - private and public.

• A.

1,2

• B.

2,4

• C.

3,5

• D.

6,10

C. 3,5
Explanation
The given answer, 3,5, suggests that the WFSU (Water Flow Service Unit) of a water closet (flush tank) is applicable for both private and public use. This means that the flush tank can be used in residential homes as well as in public restrooms or commercial buildings. The numbers 3 and 5 may represent different flow rates or capacities of the flush tank, indicating that it is suitable for various settings and usage requirements.

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• 14.

### WFSU of water closet (economical flush) - private and public.

• A.

1.5, 2

• B.

2.5, 4

• C.

3,5

• D.

6,10

B. 2.5, 4
Explanation
The answer 2.5, 4 indicates the water flow rate for a water closet (economical flush) in both private and public settings. This means that the water closet uses 2.5 liters per flush in private settings and 4 liters per flush in public settings. The higher water flow rate in public settings is likely due to the higher usage and need for more efficient flushing to maintain cleanliness and hygiene.

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• 15.

### WFSU of water closet (flushometer valve) with water supply outlet of 9.5mm?

• A.

1,2

• B.

2,4

• C.

3,6

• D.

6,10

A. 1,2
Explanation
The answer 1,2 suggests that the WFSU (Water Flow Supply Unit) of a water closet with a flushometer valve and a water supply outlet of 9.5mm is 1 gallon per flush for solid waste and 2 gallons per flush for liquid waste. This means that when the flushometer valve is activated, 1 gallon of water is used to flush solid waste and 2 gallons of water is used to flush liquid waste.

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• 16.

### WFSU of water closet (flushometer valve) with water supply outlet of 13 mm?

• A.

1,2

• B.

2,4

• C.

3,6

• D.

6,10

B. 2,4
Explanation
The answer 2,4 indicates that the water closet (flushometer valve) requires a water supply outlet of 13 mm. This means that the water closet needs a water supply with a diameter of 13 mm in order to function properly.

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• 17.

### WFSU of water closet (flushometer valve) with water supply outlet of 19 mm?

• A.

1,2

• B.

2,4

• C.

3,6

• D.

6,10

C. 3,6
Explanation
The answer 3,6 indicates the water flow rate in gallons per minute (GPM) for a water closet with a flushometer valve and a water supply outlet of 19 mm. A WFSU (Water Flow Supply Unit) of 3 GPM means that the water closet will have a moderate water flow, while a WFSU of 6 GPM suggests a higher water flow rate. Therefore, the combination of 3,6 represents the range of water flow rates for this particular setup.

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• 18.

### WFSU of water closet (flushometer valve) with water supply outlet of 25 mm?

• A.

1,2

• B.

2,4

• C.

3,6

• D.

6,10

D. 6,10
Explanation
The answer 6,10 indicates the water flow rate (in liters per minute) for a water closet with a flushometer valve and a water supply outlet of 25 mm. This means that when the flushometer valve is activated, the water closet will have a flow rate of 6 liters per minute for solid waste and 10 liters per minute for liquid waste.

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• 19.

### For water supply pipes, support all piping at intervals not more than __________ at end of branches, and at change of direction  or elevation.

• A.

3 feet

• B.

4 feet

• C.

5 feet

• D.

6 feet

B. 4 feet
Explanation
Water supply pipes need to be supported at intervals not more than 4 feet at the end of branches, and at any change of direction or elevation. This is important to ensure that the pipes are properly supported and do not sag or become damaged over time. Proper support helps to prevent leaks and maintain the integrity of the water supply system.

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• 20.

### For water supply pipes, vertical piping shall be supported at each ___________.

• A.

storey

• B.

2 storey

• C.

3 storey

• D.

None of the above

A. storey
Explanation
Vertical piping for water supply pipes needs to be supported at each storey. This is important to ensure that the pipes remain stable and do not sag or collapse under the weight of the water flowing through them. Supporting the pipes at each storey helps to distribute the weight evenly and prevent any potential damage or leaks. It also allows for easier maintenance and repairs if needed.

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• 21.

### Support trap arms in excess of ____________ in length as close a possible to the trap.

• A.

1 foot

• B.

2 feet

• C.

3 feet

• D.

4 feet

C. 3 feet
Explanation
To ensure proper support, trap arms should be in excess of 3 feet in length and positioned as close as possible to the trap. This length allows for better stability and prevents any potential sagging or damage to the plumbing system.

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• 22.

### Closet rings shall be tightly fastened with _______________ up to the floor with top surface 1/4" above finish floor.

• A.

Corrosively resistant fasteners

• B.

• C.

Water resistant fasteners

• D.

Fire resistant fasteners

A. Corrosively resistant fasteners
Explanation
Closet rings need to be tightly fastened with corrosively resistant fasteners up to the floor with the top surface 1/4" above the finish floor. This is because corrosively resistant fasteners are designed to withstand corrosion caused by moisture or chemicals, which are common in bathrooms or areas where water is present. Using such fasteners ensures that the closet rings will remain securely in place and resistant to deterioration over time.

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• 23.

### What is installed in lines with rubber gasketed joints?

• A.

Hanger

• B.

Closet rings

• C.

Metal sleeves

• D.

Thrust blocks

D. Thrust blocks
Explanation
Thrust blocks are installed in lines with rubber gasketed joints. Thrust blocks are used to resist the thrust forces that occur in pipelines due to changes in fluid pressure or direction. They provide support and prevent movement or displacement of the pipeline at the joints. The rubber gasketed joints allow for flexibility and movement, while the thrust blocks ensure stability and prevent any potential damage or failure of the pipeline system.

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• 24.

### Thrust blocks is installed at ________________.

• A.

Changes in direction , tees and bends

• B.

Changes in size, reducers

• C.

• D.

All of the above

D. All of the above
Explanation
Thrust blocks are installed at all of the above mentioned locations, including changes in direction (tees and bends), changes in size (reducers), stops, and dead ends. Thrust blocks are used to prevent movement or displacement of pipes caused by changes in flow direction, size, or sudden stops. By providing resistance against the thrust forces, thrust blocks ensure the stability and integrity of the pipeline system.

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• 25.

### Materials used in excreta drainage pipings

• A.

Cast iron, ductile iron, galvanized wrought irom

• B.

• C.

Brass, Series 1000 PVC DWV, vitrified clay pipe

• D.

All of the above

D. All of the above
Explanation
The correct answer is "all of the above". This means that all the materials listed - cast iron, ductile iron, galvanized wrought iron, galvanized steel, lead, copper, brass, Series 1000 PVC DWV, and vitrified clay pipe - can be used in excreta drainage pipings.

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• 26.

### Galvanized wrought iron or galvanized steel pipe shall be used underground at least _______ above ground.

• A.

76 mm

• B.

102 mm

• C.

152 mm

• D.

208 mm

C. 152 mm
Explanation
Galvanized wrought iron or galvanized steel pipe should be used underground at least 152 mm above the ground. This requirement ensures that the pipe is adequately protected from moisture, soil corrosion, and potential damage from external factors. By keeping the pipe at this height, it reduces the risk of rusting and extends the lifespan of the pipe, ensuring its durability and functionality.

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• 27.

### Vitrified clay pipes shall be kept at least _________ below finish ground level.

• A.

0.2 m

• B.

0.3 m

• C.

0.6 m

• D.

0.75 m

B. 0.3 m
Explanation
Vitrified clay pipes should be kept at least 0.3 m below the finish ground level. This is important because it ensures that the pipes are adequately protected and prevents any potential damage or disturbance to the pipes caused by external factors such as traffic load, soil movement, or construction activities. Keeping the pipes at this depth also allows for proper installation and maintenance of the pipes, ensuring their long-term functionality and durability.

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• 28.

### Maximum Trap loadingPipe Size             Fixture Unit F.U.                                                             32                               a                                                             38                               b                                                             51                               c                                                             76                               d                                                             102                             eWhat is the value of a,b,c,d,e?

• A.

1,2,3,4,5

• B.

1,2,4,6,8

• C.

1,3,4,6,8

• D.

1,3,5,7,9

C. 1,3,4,6,8
Explanation
The values of a, b, c, d, and e can be determined by looking at the corresponding fixture unit (F.U.) values in the given table.

From the table, we can see that the F.U. value for a pipe size of 32 is 38, for a pipe size of 38 is 51, for a pipe size of 51 is 76, and for a pipe size of 102 is 102.

Therefore, the values of a, b, c, d, and e are 1, 3, 4, 6, and 8 respectively, as these are the corresponding pipe sizes for the given F.U. values in the table.

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• 29.

### Minimum Trap/ trap arm size and DFU of Bathtubs, Bidets, Laundry TuBs, Bar sinks and other sinks, Wash Basin(sets)?

• A.

31 mm, 1

• B.

32 mm, 2

• C.

38 mm, 2

• D.

51 mm, 3

C. 38 mm, 2
Explanation
The correct answer is 38 mm, 2. This means that the minimum trap size and DFU (drainage fixture unit) for bathtubs, bidets, laundry tubs, bar sinks, and other sinks, including wash basins, is 38 mm with a DFU of 2. This indicates the recommended size and capacity for the trap and drainage system to effectively handle the waste water from these fixtures.

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• 30.

### Minimum Trap/ trap arm size and DFU of drinking fountain?

• A.

31 mm, 1

• B.

32 mm, 2

• C.

38 mm, 2

• D.

51 mm, 3

A. 31 mm, 1
Explanation
The minimum trap/trap arm size and DFU of a drinking fountain is 31 mm and 1, respectively. This means that the trap and trap arm of the drinking fountain should have a minimum diameter of 31 mm, and it can handle a Drainage Fixture Unit (DFU) value of 1. The DFU value is a measure of the potential load that a plumbing fixture or group of fixtures can put on a drainage system. In this case, the drinking fountain has a relatively small drain size and a low DFU value, indicating that it has a lower water flow and waste load compared to larger fixtures.

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• 31.

### Minimum Trap/ trap arm size and DFU of clotheswasher, shower (single stall), Stall urinal?

• A.

31 mm, 1

• B.

32 mm, 2

• C.

38 mm, 2

• D.

51 mm, 2

D. 51 mm, 2
Explanation
The minimum trap size and DFU (Drainage Fixture Unit) requirements for a clothes washer, single stall shower, and stall urinal are given. The correct answer is 51 mm, 2. This means that the trap size should be at least 51 mm in diameter and the DFU value for these fixtures should be 2. The larger trap size helps to ensure proper drainage and prevent clogs, while the DFU value indicates the load on the drainage system.

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• 32.

### Minimum Trap/ trap arm size and DFU of service sink?

• A.

31 mm, 1

• B.

32 mm, 2

• C.

38 mm, 2

• D.

51 mm, 3

D. 51 mm, 3
Explanation
The correct answer is 51 mm, 3. This means that the minimum trap or trap arm size for a service sink should be 51 mm, and the DFU (drainage fixture unit) for a service sink should be 3. This ensures that the trap and drain can effectively handle the volume of waste and prevent any clogs or backups.

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• 33.

### Minimum Trap/ trap arm size and DFU of single lavatory?

• A.

31 mm, 1

• B.

32 mm, 1

• C.

38 mm, 2

• D.

51 mm, 3

B. 32 mm, 1
Explanation
The minimum trap/arm size required for a single lavatory is 32 mm, with a Drainage Fixture Unit (DFU) value of 1. This means that a 32 mm trap/arm size is sufficient to handle the drainage from a single lavatory, which is assigned a DFU value of 1. The DFU value represents the load or volume of wastewater that a fixture generates, and in this case, a single lavatory is considered to have a DFU value of 1. Therefore, a 32 mm trap/arm size is appropriate for this scenario.

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• 34.

### Minimum Trap/ trap arm size and DFU of water closet private installation?

• A.

32 mm, 1

• B.

58 mm, 2

• C.

76 mm, 4

• D.

102 mm, 6

C. 76 mm, 4
Explanation
The minimum trap size and DFU (Drainage Fixture Unit) requirement for a water closet in a private installation is 76 mm and 4 respectively. This means that the trap arm, which is the horizontal pipe that connects the trap to the drain, should have a minimum diameter of 76 mm. Additionally, the water closet is assigned a DFU value of 4, indicating its drainage capacity. This ensures proper drainage and prevents clogs or backups in the plumbing system.

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• 35.

### Minimum Trap/ trap arm size and DFU of water closet public installation?

• A.

32 mm, 1

• B.

58 mm, 2

• C.

76 mm, 6

• D.

102 mm, 6

C. 76 mm, 6
Explanation
The correct answer is 76 mm, 6. In public installations, the minimum trap or trap arm size for a water closet is typically 76 mm. This size is necessary to accommodate the larger volume of waste that is generated in public settings. Additionally, the DFU (Drainage Fixture Unit) of a water closet in public installations is usually 6. DFU is a measure of the flow rate and load that a plumbing fixture contributes to the overall drainage system.

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• 36.

### Minimum Trap/ trap arm size and DFU of urinal wall mounted (trap arm only)?

• A.

32 mm, 1

• B.

51 mm, 3

• C.

76 mm, 6

• D.

102 mm, 6

B. 51 mm, 3
Explanation
The correct answer is 51 mm, 3. This means that the minimum trap arm size for a wall-mounted urinal is 51 mm and it can handle a Drainage Fixture Unit (DFU) of 3. The trap arm size refers to the diameter of the pipe that connects the trap to the main drainage system. The DFU is a measure of the flow rate and load that a plumbing fixture places on the drainage system. In this case, a wall-mounted urinal with a trap arm size of 51 mm can handle a DFU of 3, indicating its capacity to efficiently drain waste from the fixture.

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• 37.

### Minimum Trap/ trap arm size and DFU of Mobile Home?

• A.

32 mm, 1

• B.

51 mm, 3

• C.

76 mm, 6

• D.

102 mm, 6

C. 76 mm, 6
Explanation
The correct answer is 76 mm, 6. In plumbing, the trap arm is the horizontal pipe that connects the P-trap to the sanitary tee. The trap arm size refers to the diameter of this pipe. In the case of a mobile home, the minimum trap arm size required is 76 mm (3 inches). DFU stands for Drainage Fixture Unit, which is a measure of the flow rate of wastewater from different plumbing fixtures. A mobile home typically has a DFU of 6, meaning it can handle a moderate amount of wastewater. Therefore, the correct answer is 76 mm, 6.

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• 38.

### What is the DFU of water closet when it is used to determine the septic tank size?

• A.

2

• B.

3

• C.

4

• D.

6

D. 6
Explanation
The DFU (Drainage Fixture Unit) is a measure of the flow rate of wastewater from a plumbing fixture. When determining the septic tank size, the water closet (toilet) is considered to have a DFU of 6. This means that it has a higher flow rate compared to other fixtures, such as sinks or showers, and therefore requires a larger septic tank to accommodate the wastewater.

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• 39.

### One Fixture Unit is equivalent to what?

• A.

1 cu. ft/ min

• B.

1 cu.in /hr

• C.

1 cu.cm/ sec

• D.

1 cu. m/sec

A. 1 cu. ft/ min
Explanation
One Fixture Unit is equivalent to 1 cu. ft/ min. This means that when measuring the flow rate of water through a plumbing fixture, one fixture unit is equal to one cubic foot of water per minute.

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• 40.

### For horizontal drainage branch lines connecting with a vertical stack, double sanitary tees may be used when the barrel of the fitting is at least ___________sizes larger than the largest inlet from pipes 51 mm above.

• A.

One pipe

• B.

One and a half pipe

• C.

Two pipe

• D.

Two and a half pipe

C. Two pipe
Explanation
Double sanitary tees are used for horizontal drainage branch lines connecting with a vertical stack when the barrel of the fitting is at least two pipe sizes larger than the largest inlet from pipes 51 mm above. This ensures proper flow and prevents clogging or blockage in the drainage system. Using a larger barrel size allows for smooth passage of wastewater and reduces the risk of obstructions.

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• 41.

### Provision of cleanout at its upper terminal and each run of piping at every ________ length.

• A.

3 meters

• B.

5 meters

• C.

6 meters

• D.

15 meters

D. 15 meters
Explanation
The correct answer is 15 meters because the provision of a cleanout at its upper terminal and each run of piping is required at every 15 meters length. This means that for every 15 meters of piping, there should be a cleanout provided to allow for easy access and maintenance of the piping system.

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• 42.

### Cleanouts may be omitted in the following except

• A.

Horizontal drain line less than 1.5 meter length

• B.

Short horizontal drainage pipe installed at a slope of 72 degrees from the vertical

• C.

Horizontal line with an aggregate offset angle of direction more than 135 degrees

• D.

None of the above

C. Horizontal line with an aggregate offset angle of direction more than 135 degrees
Explanation
Cleanouts may be omitted in a horizontal drain line less than 1.5 meter length, a short horizontal drainage pipe installed at a slope of 72 degrees from the vertical, or none of the above. However, a horizontal line with an aggregate offset angle of direction more than 135 degrees cannot omit cleanouts.

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• 43.

### Each cleanout for an interceptor shall be ____________ of such interceptor.

• A.

Inside

• B.

Outside

• C.

Left side

• D.

Right side

B. Outside
Explanation
The correct answer is "outside" because cleanouts for an interceptor should be located outside of the interceptor itself. This ensures easy access for maintenance and cleaning purposes without the need to enter the interceptor. Placing the cleanout on the inside would make it difficult to reach and may require disassembling the interceptor, causing inconvenience and potential damage.

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• 44.

### Cleanouts shall not be provided for pressure drainage systems.

• A.

Yes

• B.

No

• C.

Sometimes

• D.

Right side

B. No
Explanation
Cleanouts are access points in a drainage system that allow for the removal of blockages or obstructions. However, pressure drainage systems are designed to move wastewater using pressure rather than gravity, so they do not require cleanouts. Therefore, cleanouts shall not be provided for pressure drainage systems, making the answer "no" correct.

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• 45.

### ____________ shall be installed where raised heads may cause hazard to passing personnel or vehicles.

• A.

Counter type cleanout

• B.

Countersunk cleanout

• C.

Wall cleanout

• D.

Floor cleanout

B. Countersunk cleanout
Explanation
A countersunk cleanout should be installed where raised heads may cause a hazard to passing personnel or vehicles. The term "countersunk" refers to a type of screw or bolt that is designed to sit flush with the surface it is installed in, minimizing any protrusions that could cause injury or damage. In this context, a countersunk cleanout would be installed in a way that it does not create any raised heads that could pose a hazard to people or vehicles passing by. This ensures safety and prevents accidents.

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• 46.

### All plumbing fixtures shall be drained into the public sewer or private sewage disposal system by ____________.

• A.

Pressure

• B.

Air

• C.

Water

• D.

Gravity

D. Gravity
Explanation
Plumbing fixtures need to be drained into the public sewer or private sewage disposal system by gravity. Gravity allows the wastewater to flow naturally downwards, utilizing the force of gravity to move the water and waste through the pipes and into the sewer system. This is the most common and efficient method of drainage, as it does not require any additional energy or equipment.

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• 47.

### Drainage piping serving fixtures which have flood level rims located below the elevation of the nearby upstream invert of the public sewer shall be protected from backflow of sewage by installing an _______________.

• A.

Check valve

• B.

Backwater valve

• C.

Gate valve

• D.

Air break

B. Backwater valve
Explanation
A backwater valve is installed to protect drainage piping serving fixtures with flood level rims located below the elevation of the nearby upstream invert of the public sewer from backflow of sewage. This valve prevents sewage from flowing back into the fixtures by allowing wastewater to flow out but closing when there is a reverse flow. It acts as a barrier, ensuring that sewage does not enter the fixtures and cause damage or contamination.

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• 48.

### Drainage piping serving fixtures  located below the crown level of the main sewer shall discharge into an approved _______________ or receiving tank.

• A.

Water tight sump

• B.

Septic tank

• C.

Gravity tank

• D.

Water pump

A. Water tight sump
Explanation
The correct answer is water tight sump. Drainage piping serving fixtures located below the crown level of the main sewer needs to discharge into an approved water tight sump. A water tight sump is a container that collects and holds wastewater until it can be pumped out or removed by other means. It is designed to prevent leakage or seepage of wastewater into the surrounding soil or groundwater.

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• 49.

### Minimum size of any discharge pipe from a sump having water closet shall not be less than __________ diameter.

• A.

30.8 mm

• B.

50.8 mm

• C.

102 mm

• D.

76 mm

B. 50.8 mm
Explanation
The minimum size of any discharge pipe from a sump having a water closet should not be less than 50.8 mm in diameter. This is important to ensure proper flow and prevent clogging or blockages in the pipe. A larger diameter allows for a greater volume of water to pass through the pipe, reducing the risk of obstructions and ensuring efficient drainage.

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• 50.

### Bathtub, laundries, washing machine standpipes, kitchen sinks and dishwashers shall be considered ______________.

• A.

Bubbles producing fixtures

• B.

Suds producing fixtures

• C.

Oil producing fixtures

• D.

Ordinary fixtures

B. Suds producing fixtures
Explanation
The correct answer is "suds producing fixtures". This means that these fixtures are capable of producing suds or foam, typically due to the use of soap or detergent. This term is commonly used in plumbing and refers to fixtures that are specifically designed for activities that involve the use of soap or detergent, such as bathing, laundry, and dishwashing.

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• Jan 22, 2017
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