308A Fabrication Techniques 2

Question 1

What is a 'snap lock' seam used for in sheet metal fabrication?

Accepted Answer

Connecting round duct sections longitudinally with a self-locking seam that snaps together

Answer

Joining two pieces of heavy plate

Answer

Attaching insulation

Answer

Connecting electrical wiring

Question 2

When operating a power squaring shear, what safety device prevents the operator's hands from entering the cutting area?

Accepted Answer

A holddown or finger guard assembly

Answer

Safety glasses

Answer

Steel-toed boots

Answer

A face shield

Question 3

What is the purpose of a 'bar folder' in sheet metal fabrication?

Accepted Answer

To make narrow folds and hems on sheet metal edges for seams and safe edges

Answer

To store metal bars

Answer

To fold reinforcing bars

Answer

To measure bar stock

Question 4

What is 'grooving' in sheet metal work?

Accepted Answer

Flattening and locking a grooved seam by closing the folded edges tightly together

Answer

Cutting channels in the metal

Answer

Creating decorative lines

Answer

Removing burrs from cut edges

Question 5

What is the correct sequence for fabricating a rectangular duct section?

Accepted Answer

Cut to size, form seam edges, notch corners, then bend to shape

Answer

Bend first, then cut to size, then add seams

Answer

Weld all joints, then cut to size

Answer

Install hangers first, then form the duct around them

Question 6

What is 'burring' in sheet metal work?

Accepted Answer

Turning a narrow flange or edge on the end of a round pipe or disc

Answer

Creating rough edges

Answer

Removing rust from the metal

Answer

Applying a protective coating