A 5/16 in bolt with national course threads will have:
A) 18 threads per inch. B) 16 threads per inch.
C) 20 threads per inch. D) 24 threads per inch.
Question 2
A ________ duct system uses several large ducts leaving the main plenum that branch off into smaller ducts as they get closer to their destination.
A) central plenum system B) perimeter loop system
C) closed loop system D) reducing radial duct system