What is the primary purpose of pressure testing pipe joints in a plumbing system?

• A) To check for proper alignment
  

• B) To ensure airtight and watertight connections

• C) To confirm correct pipe size

• D) To determine pipe thickness

2. What material is used to pack caulked joints in cast iron soil pipes before filling with molten lead?

• A) Rubber

• B) Oakum or hemp

• C) Plastic sealant

• D) Fiberglass

What is the minimum depth of molten pig lead required in a caulked joint?

• A) 12.5 mm

• B) 19 mm

• C) 25.4 mm

• D) 32 mm

When using threaded joints, where should the pipe joint material be applied?

• A) On both male and female threads

• B) Only on male threads

• C) Only on female threads

• D) On the entire pipe surface

What is the minimum wall thickness requirement for threaded plastic pipes?

• A) Schedule 20

• B) Schedule 40

• C) Schedule 60

• D) Schedule 80

What type of joint is used between lead pipe and brass or copper fittings?

• A) Caulked joint

• B) Threaded joint

• C) Wiped lead joint

• D) Solvent cement joint

Cement mortar joints are prohibited in which type of system?

• A) New building sewers

• B) Gas piping

• C) Potable water lines

• D) Vent pipes

What is the approved method for joining clay sewer pipes?

• A) Caulked joints

• B) Solvent cement joints

• C) Neoprene gaskets

• D) Soldered joints

Which type of joint is allowed in fixture drains and traps for easy maintenance?

• A) Wiped joint

• B) Slip joint

• C) Threaded joint

• D) Brazed joint

Which of the following is NOT considered an obstruction in the drainage system?

• A) A fitting with a ledge that traps debris

• B) A pipe connection with an internal shoulder

• C) Enlarging a 76 mm closet bend to 102 mm

• D) A sudden pipe size reduction