Plumbing Inspection Section#3 Drain, Waste and Vent Plumbing Quiz#3

You should have finished Study Session 2 before starting this study session. This study session deals with some of the problems that can be found with drain, waste, and vent piping.

The estimated completion time is one hour.

Objectives
At the end of this study session, you should be able to:

• List eleven problems commonly found with drain, waste and vent piping.

• Question 1

  Needs Grading

  	Describe two methods of failure in cast iron pipe which can result in leakage.
  	Selected Answer: 1. pinholes 2. horizontal splits in cast iron pipe Correct Answer:   1. Pin hole leaks 2. Cracking Response Feedback: [None Given]

• Question 2

  Needs Grading

  	List four causes of damaged piping.
  	Selected Answer: 1. mechnically damaged 2. bent or broken as a result of building settlement or seismic forces 3. split as a result of freezing or corrosion 4. damaged by inadequate support Correct Answer:   1. Mechanically damaged 2. Building settlement or seismic forces 3. Freezing or corrosion 4. Inadequate support Response Feedback: [None Given]

• Question 3

  Needs Grading

  	List four reasons why leaks can occur in drain, waste and vent piping.
  	Selected Answer: 1. Poor joints 2. Damaged, incomplete or defective piping or traps 3. Freezing 4. Clogging Correct Answer:   1 Poor joints 2. Damaged, incomplete or defective piping 3. Freezing 4. Clogging Response Feedback: [None Given]

• Question 4

  Needs Grading

  	List six locations for possible cross connections in a residence.
  	Selected Answer: 1. Supply faucets below the flood rim of fixture 2. Drain connections from dishwashers 3. Drain connections from clothes washers 4. Water softeners 5. Outside hose bibbs with hoses attached 6. Lawn sprinkler systems Correct Answer: - Supply faucets below the flood rim of fixtures - Drain connections from dishwashers - Drain connections from clothes washers - Water softeners - Outside house bibbs with hoses attached - Lawn sprinkler systems - Bidets - Vegetable sprayers and extendable faucets at kitchen sinks - Shower wands on bathtubs - Toilets - Supply connections to heating boilers - Trap primers Response Feedback: [None Given]

• Question 5

  Needs Grading

  	List three reasons for galvanized steel pipe rusting.
  	Selected Answer: 1. earch contact with galvanized steel 2. condensation 3. inside Correct Answer:   1. Rusting on the inside due to the action of water over time 2. Being too close to grade 3. Surface rusting due to condensation or leaks Response Feedback: [None Given]

• Question 6

  Needs Grading

  	List two methods of reducing the freezing risk of pipes in a cold environment.
  	Selected Answer: 1. Insulation 2. Heat tracing Correct Answer:   1. Insulating the pipe 2. Wrapping the pipe with heating cable Response Feedback: [None Given]

• Question 7

  Needs Grading

  	What is the implication of a cross connection?
  	Selected Answer: Contamination of potable water supply Correct Answer:   Contamination of a potable water supply. Response Feedback: [None Given]

• Question 8

  Needs Grading

  	What is the minimum trap size for a kitchen sink?
  	Selected Answer: 1 and 1/2 inch Correct Answer:   1.5 inches Response Feedback: [None Given]

• Question 9

  Needs Grading

  	What is the required slope for nearly horizontal pipes in a drain, waste and vent system?
  	Selected Answer: 1/4 to 1/2 per foot  larger pipes can slope 1/8 per foot Correct Answer:   1/4 to 1/2 inch fall per foot run Response Feedback: [None Given]

• Question 10

  Needs Grading

  	Why are leaks more difficult to find in drain, waste and vent systems than in supply systems?
  	Selected Answer: Because the pipes are usually idle Correct Answer:   The pipes are usually idle, and the water is not under pressure. Response Feedback: [None Given]

• Question 11

  0 out of 0 points

  	A toilet uses a trap diameter of:
  	Selected Answer:   3 inch Answers: 1 1/4 inch 1 1/2 inch 2 inch   3 inch none of the above Response Feedback: Good work

• Question 12

  0 out of 0 points

  	Copper pipe does not rust.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work

• Question 13

  0 out of 0 points

  	Welded steel piping is permitted as a material in drain, waste and vent systems.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work