Sheet Metal Ductwork
Sheet Metal Ductwork
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Question 1 |
Which of the following is an alloy?
A | Zinc |
B | Nickel |
C | Iron |
D | Stainless steel |
Question 2 |
Variable air volume (VAV) boxes save on operating costs by varying _____.
A | the amount of air instead of the temperature |
B | both the amount of supply air and conditioned air |
C | both the air and the temperature |
D | the temperature instead of the air |
Question 3 |
Steel is made up of iron and ________.
A | carbon |
B | aluminum |
C | oxygen |
D | nickel |
Question 4 |
Which of the following connects branch ducts to the main trunk duct?
A | Scoop |
B | Hammerlock |
C | Spin-in |
D | Extractor |
Question 5 |
When selecting sheet metal, a higher gauge number indicates a(n) _____.
A | thinner sheet |
B | pure metal |
C | thicker sheet |
D | alloy with more than two elements |
Question 6 |
If a wall or another duct is blocking the side of the duct where a manual volume damper must be
installed, the shaft for the damper quadrant should be located _____.
A | on top of the blocking duct |
B | at the intersection of two branch ducts |
C | under the blocking duct |
D | on the unblocked side |
Question 7 |
Sheet steel, cold-rolled steel, and copper are examples of _____ metals.
A | basic |
B | stainless |
C | coated |
D | pure |
Question 8 |
Which of the following controls the spread of smoke and flames within an air distribution system?
A | Louvers |
B | Isolators |
C | Dampers |
D | Breakaways |
Question 9 |
When measuring the thickness of coated sheet metal, the installer should _____.
A | use one gauge thinner than the measurement |
B | use the actual reading |
C | decrease the reading by two |
D | use one gauge thicker than the measurement |
Question 10 |
When installing fibrous glass duct liners, adhesives must be reinforced with _____.
A | vapor barriers |
B | mechanical fasteners |
C | jackets |
D | sleeving |
Question 11 |
Vertical duct runs are known as _____.
A | uppers |
B | standing S runs |
C | risers |
D | lifters |
Question 12 |
When measuring and cutting 1 1/2
-inch thick fiberglass blanket wrap for rectangular duct, how
much should be added to account for thickness?
A | 10 inches |
B | 12 inches |
C | 6 inches |
D | 8 inches |
Question 13 |
The sound power level is a rating that specifies _____.
A | the sound made by air flowing through a duct |
B | the amount of sound a fan will produce |
C | sound entering the duct system from surrounding areas |
D | the amount of power produced by a blower fan |
Question 14 |
What may be required to reduce noise in an HVAC system?
A | Acoustic prevention |
B | Sound attenuation |
C | Vapor barriers |
D | Acoustic transfer |
Question 15 |
When cutting 1-1/2" blanket insulation for round or oval duct, you would add _____ inches to the
duct circumference to determine the length of the cut.
A | 3 |
B | 5 |
C | 1-1/2 |
D | 10 |
Question 16 |
When inspecting the installation of registers, grilles, and diffusers, which of the following must be
true?
A | The flange is wide enough to be seen from the finished side. |
B | The weight of the ceiling diffuser rests on the duct. |
C | The duct or sleeve is flush with the finished wall. |
D | The duct or sleeve is flush with the drywall. |
Question 17 |
Which of the following is the most common seam fabricated in the sheet metal shop prior to duct
assembly?
A | Snap lock seam |
B | Pittsburgh lock |
C | Wired edge |
D | Grooved lock seam |
Question 18 |
Trapeze hangers must be used for duct that is _____.
A | less than 60 inches wide |
B | of a heavier gauge |
C | more than 60 inches wide |
D | of a lighter gauge |
Question 19 |
Which of the following duct connections eliminates the need for further reinforcement?
A | Transverse duct connector |
B | S-slip connector |
C | Standing seam |
D | Pittsburgh lock |
Question 20 |
Which of the following is a direct factor in the air leakage for a system?
A | Level of acoustic insulation |
B | Seam and joint types |
C | Gauge of sheet metal |
D | The support system |
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