Question 1

If three fixtures feature a DFU of four, and five fixtures feature a DFU of two, what is the total DFU?&#10;A)14&#10;B)22&#10;C)120&#10;D)11

Accepted Answer

The total DFU (Drainage Fixture Units) is calculated by multiplying the number of fixtures by their respective DFU values and then summing those products. For three fixtures with a DFU of four, the total is 3*4=12. For five fixtures with a DFU of two, the total is 5*2=10. Adding these together gives 12+10=22.

Question 2

Which of the following is NOT an advantage of a siphonic roof drainage system?&#10;A)cost savings&#10;B)reduced pipe sizes&#10;C)recommended design standard&#10;D)reduced roof penetrations

Accepted Answer

Siphonic roof drainage systems are known for cost savings due to less underground infrastructure, reduced pipe sizes because of the full bore flow, and fewer roof penetrations since the system requires fewer downpipes. However, there is no universally recommended design standard specifically for siphonic systems; standards and recommendations can vary by region and application.

Question 3

Related to determining roof load factor, what is the weight of one cubic foot of water?&#10;A)624 pounds&#10;B)6.28 pounds&#10;C)164 pounds&#10;D)62.48 pounds

Accepted Answer

The weight of one cubic foot of water is approximately 62.48 pounds. This is a standard measurement used in various calculations, including those related to the load-bearing capacity of structures.

Question 4

When would it be appropriate for a plumbing apprentice to design systems?&#10;A)under the general direction of a plumbing contractor&#10;B)under the general direction of a licensed designer&#10;C)when buildings are fast tracked&#10;D)it is not the responsibility of an apprentice

Accepted Answer

Apprentices are in a learning phase and do not have the qualifications or experience to design systems independently. Design responsibilities typically fall to licensed professionals.

Question 5

All codes typically share the same concept in that minimum vent size is:&#10;A)equal to the drain line size&#10;B)half of the drain line size&#10;C)double the drain line size&#10;D)three-quarters of the drain line size

Accepted Answer

The answer of All codes typically share the same concept...

Question 6

When do drainage fixture unit (DFU)discharge values come into play?&#10;A)when determining minimum pipe sizes for building drains and sewers&#10;B)when calculating load placed on a system based on fixture discharge&#10;C)when sizing venting systems&#10;D)all of the above

Accepted Answer

Drainage fixture unit (DFU) discharge values are considered in all these scenarios: determining minimum pipe sizes for building drains and sewers, calculating load placed on a system based on fixture discharge, and sizing venting systems. They help ensure that the plumbing system is designed to handle the expected flow and prevent issues such as clogs or inadequate venting.

Question 7

Which of the following would typically have the smallest DFU value?&#10;A)commercial food waste disposer&#10;B)clothes washer&#10;C)bathtub&#10;D)water closet

Accepted Answer

A bathtub typically has a smaller Drainage Fixture Unit (DFU) value compared to other fixtures like commercial food waste disposers, clothes washers, and water closets, which generally have higher water usage and drainage requirements.

Question 8

Most building codes require that secondary roof drainage systems to:&#10;A)be completely separate from primary roof drainage systems&#10;B)be combined with primary roof drainage systems&#10;C)utilize a mix of separate and primary drainage systems&#10;D)none of the above

Accepted Answer

Most building codes mandate that secondary roof drainage systems be completely separate from primary roof drainage systems to ensure redundancy in case the primary system fails. This separation helps prevent system overload and potential water damage.

Question 9

Vent pipe sizes are selected:&#10;A)after plumbing isometric layout is provided&#10;B)before plumbing isometric layout is provided&#10;C)after all drains are installed&#10;D)at the end of the building project

Accepted Answer

Vent pipe sizes are selected after the plumbing isometric layout is provided, as the layout helps in determining the required sizes and types of vent pipes needed for the plumbing system.

Question 10

Appropriately sized storm drainage systems are based upon what?&#10;A)rainfall rates&#10;B)size of the building&#10;C)total DFU&#10;D)nearby infrastructure

Accepted Answer

Appropriately sized storm drainage systems are based on rainfall rates, as these systems need to be designed to handle the amount of water that can be expected to fall during storms, ensuring that runoff is managed effectively to prevent flooding and water damage.

Question 11

Accurate sanitary drainage layouts depend on which factor?&#10;A)DFUs&#10;B)line sizing&#10;C)pipe slope&#10;D)all of the above

Accepted Answer

The answer of Accurate sanitary drainage layouts depend on which...

Question 12

A technician skilled in the aspect of design has the legal authority to overrule a licensed design professional.

Accepted Answer

The answer of A technician skilled in the aspect of...

Question 13

Which of the following is a plan provided by a designer or engineer?&#10;A)DFU&#10;B)isometric drawing&#10;C)partial plan view&#10;D)sizing chart

Accepted Answer

The answer of Which of the following is a plan...

Question 14

There is really never a reason to exceed code when considering installation requirements.

Accepted Answer

The answer of There is really never a reason to...

Question 15

Siphonic roof drain systems have many cost advantages.

Accepted Answer

The answer of Siphonic roof drain systems have many cost...

Deck 4: Service and Repair: DWV Systems