BS: Lesson 2 - Water Supply & Drainage Systems

Question 1

What are the 3 types of plumbing systems

Answer 1

supply systems - pressurized system

sanitary system - gravity feed system

storm water system - gravity feed system

Question 2

In regards to water supply, what are the 4 concerns for water

Answer 2

acidity

hardness

carcinogens

disease

Question 3

Water that has a pH of 7 is

Answer 3

neutral

Question 4

In terms of acidity, rain water that falls from the sky is, which one:

1. has no acidity
2. is slightly acidic
3. highly acidic

Answer 4

slightly acidic

Question 5

In terms of acidity, water with a pH between 7 and 14 is what?

Answer 5

A basic alkaline solution

Question 6

What happens when rain water mixes with the bi-products of combustion in the air?

Answer 6

It forms sulfuric acid and nitric acid rain

Question 7

What causes sulfuric acid rain

Answer 7

Rain water mixing with sulfuric acid from combustion air

Question 8

What causes nitric acid rain

Answer 8

Rain water mixing with nitrogen compounds from combustion air

Question 9

Why is acid rain a problem

Answer 9

It corrodes metal pipes

Question 10

In terms of water supply and potability, what process results in “hard water”

Answer 10

Rain water seeping into the ground and disolving minieral like limestone (CaCo3), calcium and/or magnesium.

Question 11

Does water hardness interfere with the cleaning and lathering capabilities of detergents and soaps

Answer 11

Yes

Question 12

What four factors effect water pressure

Answer 12

Lift

Friction

Thermal expansion

Static head

Question 13

In regards to water supply, the presence of bacteria and viruses in water are a result of what

Answer 13

Improper disposal of human and animal waste.

Question 14

If water pressure from the main is insufficient to supply the upper floors of a building, what can be installed to increase the pressure

Answer 14

downfeed system

pneumatic tank system

tankless system

Question 15

In regards to a downfeed system, what is the greatest height water can be sucked up

Answer 15

33 feet

Question 16

Will pushing or sucking water in a downfeed system achieve the greatest height if trying to supply water to upper floors of a building over 3 storys

Answer 16

Pushing - water can be pushed up from below to just about any height

Question 17

Friction loss is a function of what?

Answer 17

Flow rate and diameter of the pipe.

Valves, tanks and other similar devices.

Question 18

In regards to hot water heaters and usage, the most cost effective way to conserve energy is to

Answer 18

Insulate the hot water pipes

Question 19

Arrange the following pipe materials in order of highest to least amount of thermal expansion: copper, PVC, steel, cast iron

Answer 19

PVC - greatest - coefficient of 35
copper - coefficient of 9.8
steel - coefficient of 6.5
cast iron - lowest - coefficient of 5.6

Question 20

In sanitary drains, what do sanitary vents do

Answer 20

Relieve pressure in the system and break the suction or siphoning action that occurs when water passes down thru the system

Question 21

When are soil lines and soil stacks referred to as waste lines and waste stacks

Answer 21

when a toilet is added

Question 22

What is the minimum diameter of a sanitary vent

Answer 22

1-1/4” or half the diameter of the drain it serves; which ever is greater.

Question 23

Per ANSI A117, what is the minimum size of a HCAP accessible restroom stall

Answer 23

48” wide by 56” deep

Question 24

At what height is the toilet seat of a HCAP accessible toilet

Answer 24

19”

Question 25

At what height should grab bars be above the finished floor

Answer 25

33” - 36”

Question 26

What are the minimum lengths of HCAP restroom grab bars

Answer 26

36” and 42”

Question 27

Height of drinking fountains for adults is?

Answer 27

36” - 39”

Question 28

The problem of insufficient water retention for wells and springs and excessive runoff and flooding can be improved by intelligent designing of what?

Answer 28

Storm drainage

Question 29

When or where would you use a gate valve

Answer 29

Petroleum lines, heavy liquid lines or lines with high flow rates

Question 30

What are 2 of the solutions for resolving water hammer?

Answer 30

1. install a shock arrestor or surge arrestor

2. install an air chamber - a length of pipe vertically with nothing but air