How is the R value determined for a composite structure, such as ...

[maychende]

How is the R value determined for a composite structure, such as a wall?
 
  A) The R value of the component with the highest R value is used.
  B) The R value of the component with the lowest R value is used.
  C) The R values of all the individual components are added together and averaged.
  D) The R values of all the individual components are added together.

Question 2

To avoid system breakdown due to the failure of components that have a predictable service life, it is wise to:
 
  A) Always use pulleys that have two belts.
  B) Not purchase any equipment that has parts that can wear out.
  C) Schedule parts replacements for wear items near the end of their service life.
  D) Install another backup system that can be quickly brought online.

[jjorrostieta]

Answer to Question 1

D

Answer to Question 2

C

[maychende]

Thank you!

[jjorrostieta]

Always glad to help...