Which sewing threads interlock in a conventional lockstitch?
A Only two looper threads
B Two ground warp yarns
C Two garment labels
D Needle and bobbin threads
Answer: D. Needle and bobbin threads. A lockstitch forms where the needle thread interlocks with the lower bobbin thread.
When sewing two plies, one feeds faster than the other and gathers unintentionally. Which defect can result?
A Warp beam overrun
B Fibre fading
C Seam puckering
D Rotary screen offset
Answer: C. Seam puckering. Unequal ply feed can produce unwanted fullness and ripples along the seam.
Why is a bar tack added at a pocket opening?
A Reinforce a stress point
B Remove the seam allowance
C Reduce the stitch count
D Make garment longer
Answer: A. Reinforce a stress point. A compact group of stitches reinforces areas subjected to repeated loads.
How does a unit production system differ from moving large bundles manually?
A Cuts only a single ply
B Moves garments individually
C Eliminates garment identity
D Dyes yarn before assembly
Answer: B. Moves garments individually. A unit system often uses carriers to route individual garments or garment assemblies to operations.
For many knitted fabrics, what needle point reduces the chance of cutting loops?
A Blunt cutting blade
B Heavy cutting point
C Ballpoint needle
D Square awl point
Answer: C. Ballpoint needle. A ballpoint can displace yarns and pass between loops rather than cutting through them.
Topstitching appears on which garment surface?
A Inside the cutting knife
B Inside a yarn package
C Hidden interlining only
D Visible outer face
Answer: D. Visible outer face. Topstitching is sewn from or visible on the outer face and can reinforce or decorate the garment.
Which sewn feature removes a wedge of fullness so flat material fits a three-dimensional body shape?
A Selvage
B Bartack
C Buttonhole
D Dart
Answer: D. Dart. A dart tapers from a wider intake to a point and shapes the flat garment panel.
What function does backtacking serve at the end of a seam?
A Increase fabric width
B Secure the stitch end
C Cut the cloth edges
D Form a longer notch
Answer: B. Secure the stitch end. Backtacking places reverse or overlapping stitches at the end to help prevent unraveling.
Which machine part supplies intermittent motion to feed fabric between successive stitches?
A Pattern notch
B Feed dog
C Packing carton
D Cutting clamp
Answer: B. Feed dog. The feed dog rises, grips and advances the material at each feed cycle.
For a hem with very little visible stitching on the outside, choose a suitable method.
A Blind hemming
B Zipper topstitching
C Exposed bar tacking
D Open overedge seaming
Answer: A. Blind hemming. Blind hemming takes shallow catches of the outer fabric to minimise visible stitches.
In a sewing cell, why are related machines often placed close together?
A Increase bundle waiting deliberately
B Reduce material travel
C Remove all operator tasks
D Change fabric shrinkage alone
Answer: B. Reduce material travel. Close placement cuts transport and can support easier flow between linked operations.
Choose a stitch type often used to finish stretchy knit hems with visible parallel needle rows.
A Blind hemming only
B Straight lockstitch only
C Coverstitch
D Hand basting
Answer: C. Coverstitch. A coverstitch can form parallel top rows with looper coverage underneath, giving a hem that can stretch.
When a seam is sewn across a curved edge, why may the allowance be clipped before turning?
A Let the curve spread
B Add thread at the edge
C Move the cutting grainline
D Make the entire seam tear
Answer: A. Let the curve spread. Small relief clips can allow a curved seam allowance to open and lie flatter after turning.
Why is thread tension adjusted on a lockstitch machine?
A Change the marker width
B Trim the fabric automatically
C Balance the thread interlock
D Replace all seam allowances
Answer: C. Balance the thread interlock. Properly balanced tension places the interlock in the seam rather than pulling excessive thread onto one face.
Sewing defects occur when the looper or hook misses a loop from the needle. What is the likely result?
A New cutting notches
B Shorter garment sleeves
C Wider fabric rolls
D Skipped stitches
Answer: D. Skipped stitches. A missed thread interlacing creates a missing stitch in the seam.
Which line check can detect the same seam error before many completed garments are affected?
A Only marker plotting
B Only warehouse receipt
C In-line inspection
D Only final carton count
Answer: C. In-line inspection. Checking during sewing catches repeating defects before they spread to more units.
Where are two raw edges enclosed between successive lines of stitching?
A Plain open seam
B Flat raw edge
C French seam
D Basted open dart
Answer: C. French seam. A French seam uses a second seam to enclose the raw edges from the first sewing pass.
A buttonhole should match which feature of its button?
A Button size and thickness
B The fabric roll width
C The shade of the lining
D The sewing table height
Answer: A. Button size and thickness. The opening must fit the button’s diameter and thickness while holding it during use.
Which attachment helps guide fabric around an edge during binding?
A Binder folder
B Steam table
C Pattern digitiser
D Shuttle loom reed
Answer: A. Binder folder. The folder turns binding tape around the fabric edge and feeds it into the stitch path.
In normal sewing, what component presses fabric against the feed mechanism?
A Warping creel
B Bobbin case only
C Presser foot
D Cutting marker
Answer: C. Presser foot. The presser foot holds material against the feed dogs so it can advance in a controlled manner.
Raised blisters appear on a fused panel after cooling. What is the visible defect called?
A Button shanking
B Bubbling
C Seam grin
D Needle cutting
Answer: B. Bubbling. Bubbling describes local lifting or separation of fused layers that shows as blisters.
Which sewing arrangement moves defined bundles between operators performing successive tasks?
A Loose stock fibre system
B Rotary print system
C Package dye system
D Bundle production system
Answer: D. Bundle production system. A bundle system transfers groups of components through an established sequence of operations.
Distinguish a seam from a single stitch by identifying the seam’s role.
A It sets machine speed
B It joins material sections
C It is always one loop
D It counts fabric plies only
Answer: B. It joins material sections. A seam is a join or construction between material sections. Stitches are individual thread formations used to create it.
Trouser pieces require a crease in the same location on every unit. What helps standardise the location before pressing?
A An oversized needle
B An extra cutter grip
C The carton tare weight
D A pressing template
Answer: D. A pressing template. A template gives operators a repeatable reference for positioning the desired crease.
Which machine is commonly used to wrap thread around a cut fabric edge?
A Overlock machine
B Buttonholer
C Flat press
D Cloth spreader
Answer: A. Overlock machine. Overlock stitches overcast the edge and can trim or join pieces depending on the setup.