Chapter 10: TRAPS AND INTERCEPTORS

What is the main function of a plumbing trap?

• a) To increase water pressure

• b) To prevent sewer gases from entering a building

• c) To reduce water flow speed

• 
  d) To collect solid waste before it enters the drain

2. Which of the following plumbing fixtures must have a separate trap?

• a) Each domestic clothes washer

• b) A group of three adjacent lavatories

• c) A set of laundry tubs with a single trap

• d) A kitchen sink with a laundry tub

What is the maximum length allowed for a fixture’s tailpiece (vertical pipe between the fixture and the trap)?

• a) 0.3 meters

• b) 0.5 meters

• c) 0.6 meters

• d) 1.0 meters

What is the minimum depth of a trap seal?

• a) 25 mm

• b) 51 mm

• c) 76 mm

• d) 102 mm

Which type of trap is prohibited by the Plumbing Code?

• a) P-trap

• b) S-trap

• c) Drum trap (without approval)

• d) Both b and c

Which of the following materials is not an approved material for traps?

• a) PVC

• b) Cast iron

• c) Glass

• d) ABS

A trap arm can change direction without requiring a cleanout if the direction change does not exceed:

• a) 30 degrees

• b) 45 degrees

• c) 90 degrees

• d) 180 degrees

For trap arms 76 mm or larger, what is the maximum angle change allowed without requiring a cleanout?

• a) 15 degrees

• b) 22.5 degrees

• c) 45 degrees

• d) 90 degrees

What is the purpose of a vent pipe in relation to a plumbing trap?

• a) To increase water pressure

• b) To prevent trap siphonage and back-pressure

• c) To filter out solid waste

• d) To reduce pipe diameter

What happens if a fixture is double-trapped?

• a) It improves drainage

• b) It reduces the risk of siphonage

• c) It slows or prevents proper drainage

• d) It increases water pressure