Question

Match List - I with List - II.

List - I (Type of sample)	List - II (Sampling Technique)
A. Cotton bale B. Cotton sliver C. Length biased sample D. Wool bale with impurity	I. Tong sampling II. Core sampling III. Zoning IV. Squaring

• A. A-III, B-IV, C-II, D-I
• B. A-III, B-II, C-IV, D-I
• C. A-IV, B-II, C-III, D-I
• D. A-III, B-IV, C-I, D-II

Hint:

To remember sampling: use 'Core' for depth (Wool bales), 'Zone' for volume (Cotton bales), and 'Squaring' for continuous strands (Sliver).

Answer 1

The Correct Option is D

Concept: Sampling is a critical process in textile testing to ensure that a small portion of material accurately represents the characteristics of the bulk. Different forms of textile materials (raw bales, slivers, or fibers) require specific mechanical or manual techniques to avoid bias.

Step 1: Analyzing Cotton and Wool Bale Sampling.
For a Cotton bale, the Zoning technique is used, which involves taking small samples from different parts (zones) of the bale to account for variability. For Wool bales containing impurities, Core sampling is the standard method, where a hollow tube is driven into the bale to extract a representative cross-section of the fibers.

Step 2: Analyzing Sliver and Length-Biased Sampling.
A Cotton sliver is a continuous strand, and the Squaring method is often applied to select random fibers for length testing. A Length biased sample is typically associated with Tong sampling, where the probability of a fiber being selected is proportional to its length.

Step 3: Matching the Lists.
A-III (Cotton bale: Zoning), B-IV (Cotton sliver: Squaring), C-I (Length biased: Tong sampling), D-II (Wool bale: Core sampling).