(a) Using chain stitch
(b) Using thicker thread
(c) Using thinner thread
(d) Using lock stitch
(e) Reinforcing the seam
Preventing Structural Jamming Pucker
Structural jamming pucker occurs when fabric gets bunched up or distorted during sewing, leading to puckered seams. Certain sewing choices can help prevent this specific issue. Based on the options provided, the following methods are effective:
- Using chain stitch (a): While often associated with less stability, a chain stitch provides more flexibility compared to a lock stitch. This flexibility can allow the seam area to move slightly under tension, potentially reducing the stress build-up that causes jamming pucker in certain applications.
- Using thinner thread (c): Thinner threads require smaller needles, which create smaller perforations in the fabric. This minimizes fabric distortion and allows for lower thread tension settings, both contributing to a smoother seam and reducing the likelihood of pucker.
- Reinforcing the seam (e): Adding reinforcement, such as an extra row of stitching or using stronger materials in high-stress areas, stabilizes the seam. This distributes stress more effectively and prevents localized pulling or gathering of the fabric, thereby preventing structural jamming pucker.
Options (b) Using thicker thread and (d) Using lock stitch are generally not considered methods to *prevent* structural jamming pucker, as thicker threads can increase distortion and tension, and lock stitches, while strong, can sometimes be less forgiving under specific types of stress compared to the flexibility offered by a chain stitch in preventing this particular type of pucker.
Important Questions from Design and Analysis
Which of the following UML diagrams has a static view ?
Software validation mainly checks for inconsistencies between
To create an object-behavioral model, the analyst performs the following steps:
(A) Evaluates all use-cases
(B) Builds state transition diagram for the system.
(C) Reviews the object behaviour model to verify accuracy and consistency
(D) Identifies events that do not derive the interaction sequence.
Choose the correct answer from the options given below:
Which of the following statements is/are TRUE?
P: In software engineering, defects that are discovered earlier are more expensive to fix
Q: A software design is said to be a good design, if the components are strongly cohesive and weakly coupled
Select the correct answer from the options given below:
Coupling is a measure of the strength of the interconnections between software modules.
Which of the following are correct statements with respect to module coupling?
P: Common coupling occurs when one module controls the flow of another module by passing it information on what to do.
Q: In data coupling, the complete data structure is passed from one module to another through parameters.
R: Stamp coupling occurs when modules share a composite data structure and use only parts of it.
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