Question 1
According to SMACNA HVAC Duct Construction Standards, what is the minimum sheet metal thickness (gauge) required for a 36-inch wide rectangular galvanized steel duct operating at a positive static pressure of 2.0 inches water gauge (in. w.g.) without intermediate transverse reinforcement?
Correct Answer:
24 gauge (0.028 inches)
Question 2
In rectangular sheet metal duct fabrication, which type of transverse joint connection consists of a flat strip with folded edges slipped over the turned-up flanges of adjacent duct sections on top and bottom, combined with drive cleats on the sides?
Correct Answer:
Flat S-cleat joint
Question 3
What is the maximum allowable horizontal spacing for hangers supporting 24-gauge rectangular sheet metal ductwork installed in commercial HVAC systems per SMACNA and the International Mechanical Code (IMC)?
Correct Answer:
10 feet
Question 4
A technician is replacing a 24-inch wide by 12-inch deep rectangular duct with an equivalent round duct. Using the standard equivalent-diameter formula De = 1.30 x (a x b)^0.625 / (a + b)^0.25, what is the approximate equivalent round duct diameter?
Correct Answer:
18 inches
Question 5
When installing flexible air ducts, what is the maximum allowable sag permitted per foot of distance between support hangers according to SMACNA and IMC guidelines?
Correct Answer:
1/2 inch per foot
Question 1
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About this Exam

Prepare with the AZ ROC C-45 Sheet Metal Practice Questions - Arizona ROC C-45 Sheet Metal Examination Exam practice quiz. This question bank includes 100 questions covering duct, installed, minimum, pressure, and vent. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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AZ ROC C-45 Sheet Metal Practice Questions - Arizona ROC C-45 Sheet Metal Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on duct, installed, minimum, pressure, and vent. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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