Plumbing Inspection Section#3 Drain, Waste and Vent Plumbing Quiz#5

You should have finished Study Session 4 before starting this study session. This study session deals with traps.

The estimated completion time is one to one and a half hours.

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

• Describe in two sentences the function of the trap.
• List twelve problems found with traps.

• Question 1

  Needs Grading

  	Explain how a siphoning action can cause the water in the trap to be removed.
  	Selected Answer: If the pressure in side trap arm is not high enough to hold water, siphoing action would take water out. It could be direct siphoning or indrect siphoning.  Correct Answer: Any situation where the trap arm pressure drops below atmospheric pressure will cause the water to be pushed out of the trap. Unvented fixtures are susceptible to siphoning problems. Response Feedback: [None Given]

• Question 2

  Needs Grading

  	List four types of traps which are not permitted in residential construction.
  	Selected Answer: 1. S-trap 2. Crown-vented trap 3. Bell trap 4. Drum trap Correct Answer:   1. S-trap 2. Drum trap 3. Bell trap 4. Crown vented trap Response Feedback: [None Given]

• Question 3

  Needs Grading

  	List three ways that traps can lose their seals.
  	Selected Answer: 1. Siphonage 2. Back pressure 3. Evaporation Correct Answer:   1. Direct siphonage 2. Indirect siphonage 3. Back pressure 4. Evaporation 5. Capillary action Response Feedback: [None Given]

• Question 4

  Needs Grading

  	What is the implication of a trap arm which is too long?
  	Selected Answer: siphoning the trap or blocking the vent pipe Correct Answer:   Siphoning the trap Response Feedback: [None Given]

• Question 5

  Needs Grading

  	What is the minimum trap arm length?
  	Selected Answer: 2 times of diameter Correct Answer:   At least two pipe diameters Response Feedback: [None Given]

• Question 6

  Needs Grading

  	What is the one fixture that won?t have a trap?
  	Selected Answer: toilet Correct Answer:   Toilet Response Feedback: [None Given]

• Question 7

  Needs Grading

  	What is the purpose of a trap primer?
  	Selected Answer: trap primer is used for infrequently used traps such as those on floor drains Correct Answer:   The trap primer keeps water in a trap which is not used very often and could lose its seal by evaporation. Response Feedback: [None Given]

• Question 8

  Needs Grading

  	What is the purpose of a trap?
  	Selected Answer: to prevent odor from entering back into house Correct Answer:   To prevent sewer odors from entering the home through the plumbing fixtures. Response Feedback: [None Given]

• Question 9

  Needs Grading

  	What is the typical maximum distance between the fixture and the trap?
  	Selected Answer: 24 inches Correct Answer:   24 to 36 inches Response Feedback: [None Given]

• Question 10

  0 out of 0 points

  	A running trap is a good idea because it provides double the protection.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work

• Question 11

  0 out of 0 points

  	Every trap should be provided with some method of removal or cleaning.
  	Selected Answer:  True Answers:  True False Response Feedback: Good work

• Question 12

  0 out of 0 points

  	It?s impossible for a trap to be too big.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work