Question 1

Always get instruction and/or permission before drilling into pre-cast concrete walls.

Accepted Answer

This is important to ensure the structural integrity of the pre-cast concrete wall is maintained and to avoid any potential hazards such as hitting any embedded electrical wires or plumbing pipes.

Question 2

PVC stacks do not require support at their base.

Accepted Answer

PVC stacks, like all plumbing stacks, require proper support and anchoring at their base and at intervals along their height to ensure stability and to prevent sagging or movement.

Question 3

In a properly designed venting system, the pressure variation at any trap outlet should be + or - __________ inch water column.

Accepted Answer

1
one

Question 4

_______________ stacks are special stacks that do not receive any liquid or solid wastes; they convey air so that the pressures within the DWV system remain equalized.

Accepted Answer

The answer of _______________ stacks are special stacks that do...

Question 5

Terminal velocity is a measure of how fast water will discharge from the fixture.

Accepted Answer

Terminal velocity is a measure of the maximum speed an object will reach when falling through a fluid, such as air or water, due to the resistance of the fluid. It does not relate to the discharge of water from a fixture.

Question 6

The more branch intervals on a stack, the higher the DFU rating for each size pipe.

Accepted Answer

This statement is true. The DFU rating for a stack depends on the number and size of branch intervals. The more branch intervals there are, the higher the DFU rating will be for each size pipe.

Question 7

A stack is a vertical waste, soil, vent, or storm pipe that extends either through the _______________ or for at least _______________ stories.

Accepted Answer

The answer of A stack is a vertical waste, soil,...

Question 8

Holes for pipe penetrations in wood floors should be as tight as possible to support the pipe.

Accepted Answer

Holes for pipe penetrations should allow some room for expansion and contraction of the pipe materials, as well as slight movements within the structure. Making them too tight can lead to pipe damage or noise issues.

Question 9

Stacks made of plastic pipe must be supported every 4 feet.

Accepted Answer

Stacks made of plastic pipe typically have specific support requirements that vary based on the type and size of the pipe, as well as the standards set by the manufacturer and local building codes, but the statement that they must be supported every 4 feet is too specific and not universally applicable.

Question 10

Vent stacks should never be less than one-half the size of the drain they serve.

Accepted Answer

This is a plumbing standard to ensure proper ventilation and drainage. For example, if the drain is 3 inches in diameter, the vent stack should be at least 1.5 inches in diameter.

Question 11

Some codes require at least one stack to extend ____________________ from the base through the roof.

Accepted Answer

The answer of Some codes require at least one stack...

Question 12

A joist may not be notched in the middle _______________ of the span.

Accepted Answer

The answer of A joist may not be notched in...

Question 13

Cast iron stacks do not require support at their base.

Accepted Answer

Cast iron stacks should be supported at their base to prevent settling or movement, which may cause leaks or damage to the plumbing system.

Question 14

Stacks should be supported at every ____________________ except for threaded pipe, which should be supported at ____________________ ____________________ ____________________.

Accepted Answer

The answer of Stacks should be supported at every ____________________...

Question 15

A ____________________ ____________________ is the distance along a stack corresponding to one story in height.

Accepted Answer

The answer of A ____________________ ____________________ is the distance along...

Question 16

The space between a pipe sleeve and a pipe should be left open to allow for better ventilation.

Accepted Answer

The space between a pipe sleeve and a pipe should be completely filled with fire-resistant material to prevent fire from spreading through the sleeve. Leaving it open would not provide any protection against fire.

Question 17

At rated full load, a stack is about ____________________ full.

Accepted Answer

The answer of At rated full load, a stack is...

Quiz 13: Stacks