COSC 325 MEP FINAL EXAM WITH
SOLUTIONS
To avoid clogging and to adapt to directional changes in a drainage system a ______ ________
should always be connected to a main drain at a _____ angle, using a Y fitting and a 1/8th bend
Correct Ans-Branch drain, 45 degree
An accessible opening in a drainage system used for removal of obstructions Correct Ans-
Cleanout
Cleanouts should be used in the following locations* (multiple answers) Correct Ans--
Outside wall of building where building drain connects to the house drain
-Base of all soil and waste stacks
-Upper terminal of all horizontal branch drains
-Every 50 feet on horizontal piping that is 4" or smaller
-Every 100 feet on horizontal piping that is larger than 4"
-Direction changes greater than 45 degrees
Floor drain Correct Ans-Provided with strainer and a trap
Backwater valve Correct Ans-Check valve installed to prevent the backflow of sewage from
flooding the basement or lower levels. Use only when necessary
,Interceptor Correct Ans-Device used to separate and retain hazardous matter from normal
wastes, while allowing normal wastes to discharge from gravity
What is a common interceptor installed in residential drainage systems? Correct Ans-Grease
traps
Advantages and disadvantages of Cast iron for pipe drainage Correct Ans-Advantages:
-Long lasting
-Corrosion resistant
-Suitable for both above and below ground applications
Disadvantages:
-heavy
-rough inner surface
Advantages and disadvantages of Copper for pipe drainage Correct Ans-Advantages:
-Long lasting
-Easy to put together and dismantle
-Resists most acids
-Thin walled
-Lightweight
-Low frictional resistance
, Disadvantage
-Very expensive
-Time consuming to install
-Does not work well underground due to high conductivity of material
Advantages and disadvantages of Galvanized steel for pipe drainage Correct Ans-
Advantages:
-Strong
-Inexpensive
-Resistant to rough handling
Disadvantages
-Heavy
-Susceptible to corrosion
Susceptible to clogging
-Cant use underground
Advantages and disadvantages of Plastic (ABS and PVC) for pipe drainage Correct Ans-
Advantages:
-Inexpensive
-lightweight
-easy to install
-low frictional resistance
SOLUTIONS
To avoid clogging and to adapt to directional changes in a drainage system a ______ ________
should always be connected to a main drain at a _____ angle, using a Y fitting and a 1/8th bend
Correct Ans-Branch drain, 45 degree
An accessible opening in a drainage system used for removal of obstructions Correct Ans-
Cleanout
Cleanouts should be used in the following locations* (multiple answers) Correct Ans--
Outside wall of building where building drain connects to the house drain
-Base of all soil and waste stacks
-Upper terminal of all horizontal branch drains
-Every 50 feet on horizontal piping that is 4" or smaller
-Every 100 feet on horizontal piping that is larger than 4"
-Direction changes greater than 45 degrees
Floor drain Correct Ans-Provided with strainer and a trap
Backwater valve Correct Ans-Check valve installed to prevent the backflow of sewage from
flooding the basement or lower levels. Use only when necessary
,Interceptor Correct Ans-Device used to separate and retain hazardous matter from normal
wastes, while allowing normal wastes to discharge from gravity
What is a common interceptor installed in residential drainage systems? Correct Ans-Grease
traps
Advantages and disadvantages of Cast iron for pipe drainage Correct Ans-Advantages:
-Long lasting
-Corrosion resistant
-Suitable for both above and below ground applications
Disadvantages:
-heavy
-rough inner surface
Advantages and disadvantages of Copper for pipe drainage Correct Ans-Advantages:
-Long lasting
-Easy to put together and dismantle
-Resists most acids
-Thin walled
-Lightweight
-Low frictional resistance
, Disadvantage
-Very expensive
-Time consuming to install
-Does not work well underground due to high conductivity of material
Advantages and disadvantages of Galvanized steel for pipe drainage Correct Ans-
Advantages:
-Strong
-Inexpensive
-Resistant to rough handling
Disadvantages
-Heavy
-Susceptible to corrosion
Susceptible to clogging
-Cant use underground
Advantages and disadvantages of Plastic (ABS and PVC) for pipe drainage Correct Ans-
Advantages:
-Inexpensive
-lightweight
-easy to install
-low frictional resistance
