CDC 3E351 Volume 6- Test Questions &
Answers
When making seam allowances, you must consider Correct Ans-Width of seam and thickness
of metal
The bottom double seam is used to fasten an end on a duct that is what? Correct Ans-
cylindrical
What tools are required to set a double seam in sheet metal? Correct Ans-Mallet and bench
stake
To avoid damaging the seam what should be done before using the Pittsburgh machine?
Correct Ans-Adjust it for metal thickness
How many parts make up a Pittsburgh lock seam? Correct Ans-2
Before removing the sheet metal from the cornice brake, which tool do you use to flatten the
seam flange for a Pittsburgh lock seam? Correct Ans-Mallet
What do you use to seat a Pittsburgh sheet metal flange in the pocket? Correct Ans-Hammer
and rivet set
, The recommended joint connection and bracing for a 24-gauge galvanized steel duct, 23-inches
wide installed with 35-inch centers is a drive slip and a Correct Ans-Standing S-slip with a
cross brake added for strength
For a duct that is 20" wide × 15" high the drive slips should be? Correct Ans-17" long
Drive slips are cut with 45° angles on one end for Correct Ans-Easier installation
Which seam is used to join rectangular takeoff fittings to rectangular ducts Correct Ans-
tapped
"Clinch lock," "P-lock," and "tap connector" refer to what type of connections? Correct Ans-
tapped
Each end of a sheet metal duct section requires how much allowance for the S- and drive
connections? Correct Ans-1/2 inch
To form a slip joint you must Correct Ans-Crimp one end of each duct piece
What is the first step in rivet installation? Correct Ans-Setting
Installing solid rivets in light-gage metal without first drilling or punching holes is called what?
Correct Ans-Drawing rivets
Answers
When making seam allowances, you must consider Correct Ans-Width of seam and thickness
of metal
The bottom double seam is used to fasten an end on a duct that is what? Correct Ans-
cylindrical
What tools are required to set a double seam in sheet metal? Correct Ans-Mallet and bench
stake
To avoid damaging the seam what should be done before using the Pittsburgh machine?
Correct Ans-Adjust it for metal thickness
How many parts make up a Pittsburgh lock seam? Correct Ans-2
Before removing the sheet metal from the cornice brake, which tool do you use to flatten the
seam flange for a Pittsburgh lock seam? Correct Ans-Mallet
What do you use to seat a Pittsburgh sheet metal flange in the pocket? Correct Ans-Hammer
and rivet set
, The recommended joint connection and bracing for a 24-gauge galvanized steel duct, 23-inches
wide installed with 35-inch centers is a drive slip and a Correct Ans-Standing S-slip with a
cross brake added for strength
For a duct that is 20" wide × 15" high the drive slips should be? Correct Ans-17" long
Drive slips are cut with 45° angles on one end for Correct Ans-Easier installation
Which seam is used to join rectangular takeoff fittings to rectangular ducts Correct Ans-
tapped
"Clinch lock," "P-lock," and "tap connector" refer to what type of connections? Correct Ans-
tapped
Each end of a sheet metal duct section requires how much allowance for the S- and drive
connections? Correct Ans-1/2 inch
To form a slip joint you must Correct Ans-Crimp one end of each duct piece
What is the first step in rivet installation? Correct Ans-Setting
Installing solid rivets in light-gage metal without first drilling or punching holes is called what?
Correct Ans-Drawing rivets
