PC Test 3

Connects directly with an individual trap underneath or behind the fixture

• Individual vent

• Local vent

• Backvent Pipe

• Revent Pipe

Answer explanation

Additional info:
- Individual Vent: vents a fixture trap and connects above the fixture served or terminates in the open air
- Local vent: a pipe or shaft to convey foul air from a plumbing fixture or a room to the outer air

 

Minimum distance of a 32 mm trap arm diameter to a vent

• 0.76 mm

• 1.07 mm

• 64 mm

• 76 mm

Answer explanation

Additional info:
- length of trap arm shall in no case be less than two times the diameter of the trap arm
- 32 mm x 2 = 64 mm
- the maximum length of a 32 mm trap arm is 0.76 m

What will be the size of 0.5% sloped circular bottom gutter serving a roof area of 180 sqm, and the rainfall intensity around the area is 76 mm/hr?

• 152 mm

• 178 mm

• 127 mm

• 102 mm

Answer explanation

You may refer to Table 11-2a, however, do not expect that the board exam includes table for reference.

You may use the formula taught in our classes to solve this kind of problem.

All condensers and sumps shall be properly trapped at the outlet with a deep seal trap extending to within ____ of the bottom of the tank.

• 4"

• 2"

• 6"

• 12"

If a septic tank can have an effective capacity of 4000 L, how much does the secondary compartment hold?

• 1,333 L

• 2,666 L

• 5,332 L

• 1000 L

Answer explanation

Additional info: The maximum capacity of the secondary compartment of a septic tank is 1/3 of the total capacity of such tank.
- 1/3 of 4000 L is 1,333 L

What downspout size would you specify for an 800 sqm roof with a rainfall intensity around the area of 152.4 mm/hr?

• 178 mm

• 127 mm

• 152 mm

• 203 mm

Answer explanation

Additional Info:
You may refer to Table 11-2a, however, do not expect that the board exam includes table for reference.

You may use the formula taught in our classes to solve this kind of problem.

The minimum inlet and outlet size for sand interceptor

• 51 mm

• 76mm

• equal or greater than the building drain

• aggregate cross-sectional area of he drain pipes

Answer explanation

Additional info:
- The outlet pipe shall be the same size as the inlet size of the oil interceptor, the minimum being 76 mm

 

The size of a vent pipe is determined by _____. 

• slope and the waste served

• slope and location

• FU and length

• FU and slope

Answer explanation

Source: RNPCP, Chapter 7, Table 7-5, and Chapter 9

What is the sewage that turns dark and smell unpleasantly due to anaerobic decomposition?

• scum

• sceptic

• sludge

• anaerobic

Answer explanation

Additional info:
- scum: the floating parts in a septic tank
- sludge: the semi-liquid substance that accumulates at the bottom

What is the estimated sewage flow rate of bowling alleys with snack bar only?

• 18.9 LpD per lane

• 56.8 LpD per lane

• 132.5 LpD per lane

• 283.9 LpD per lane

Answer explanation

You may convert the values to Gallons for easier memorization.