Practice Tests Flashcards
List 3 types of measuring tools used in the shop:
Rules, tapes, specialty measuring devices
To adjust the blanks and patterns for growth, what do you remove ?
1/16th per joint
The net pattern lines are created on a blank that has been cut to size by:
Marking the allowances
What are the 2 adjustments that need to be checked when using the break?
The distance between the top leaf and folding leaf.
The clamping pressure
When using the box and pan break, the operator should always what?
Check the alignment of the fingers to ensure that’s they are straight
Over bending of material in the break is done to compensate for what?
Spring back
The allowances on curved cheeks are:
3/16”
Cheeks with straight sides may have the male Pittsburgh allowance of:
1/4”
To properly notch the allowance of a runner that will be broken, the notch should be:
To the net pattern
On a slip and roll forming machine, the roll is set to form the amount of curve is the:
Rear roll
Y-Branches and larger fittings may require a ____
2 piece heel
When folding the 1/2” fold on fittings to accept a drive cleat, a ______ may not be used
Cheek bender
To prevent damage to the folding leaf when forming a hammerlock, it is necessary to relieve the material used for the _____ of the Pittsburgh lock
What are 4 advantages that the proprietary duct connection offers over a standing drive connection
Fabrication is simplified.
The joint has more rigidity
The joint makes a better seal
Net patterns are only required
Before attempting to assemble the Pittsburgh lock, it is important to ensure that:
The lock is open and loose enough to accept the hook
Tacking a Pittsburgh seam refers to what?
Folding the flange over at intervals
When assembling a slip and drive joint, the drive cleat goes in the what?
Folded side
When bending over the hammerlock flange, the flange should be _____ by placing the project on a bench
Backed up
Flexible duct connection is used to:
Isolate HVAC equipment from ductwork
What is the maximum length of a fire damper sleeve with breakaway connections ?
Fire separation wall plus 6” on both sides
A fire damper may be adjusted or modified to fit odd sized ductwork if:
Never, they are all ULC rated
A fire damper sleeve required for a 8X8 duct line. What size does the damper need to be?
8x8
Edge distance refers to the distance between the edge of the material and the ______ of the fastener that will be used to secure the seam
Center
The minimum recommended edge distance for fasteners is:
2 times the fastener diameter
Thicker metal will allow a ______ pitch to be used
Larger
Why are lap seams not spot welded at the ends first to hold them in place while fabricating the seam?
Buckling may occur
What is the advantage of rivets over screws or bolts ?
They are a more permanent manner
The pop rivet is a type of:
Blind rivet
What is the allowance for grooved seams which are lighter than 22Gauge?
(3W) three times the width of the seam
When setting the fingers of the barfolder, the fingers should be set at:
The width of the seam minus 2 metal thicknesses
After hooking the folded edges of the grooved seam together, you should:
Set the seam tight
How many breaks on a rectangular hammerlock ?
3
The pocket will not change with the adjustment of the feed guide. The pocket will always be what size?
3/8” deep
