Ducts over 60 inches wide must be supported with _____.

Ducts over 60 inches wide must be supported with _____.
 
  a. channels
  b. trapeze hangers
  c. strap hangers
  d. heavy gauge wires

---

[Ques. 2] What type of duct connector contains an additional hem reinforcement?
 
  a. Standing S
  b. Transverse
  c. S-slip
  d. Drive

---

[Ques. 3] The grooved lock seam is also known as a(n) _____.
 
  a. Pittsburgh lock
  b. acme, or pipe lock
  c. drive connector
  d. S-slip

---

[Ques. 4] When steel is rolled while it is cold, it _____.
 
  a. gets softer
  b. is annealed
  c. gains tensile strength
  d. gets thicker

---

[Ques. 5] What is the minimum width of support straps used to hang flexible ducts?
 
  a. 1/4 inch
  b. 1 inch
  c. 1-1/2 inches
  d. 2 inches