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Concrete batchers proportion ingredients by weighing each material separately for every batch. The unit notes that for important jobs weight batching is preferred over volume batching primarily because:
Answer & Solution
Correct answer: A.
1. The unit explains why weigh-batching is the practical default on important works.
2. Volume batching suffers errors from absolute volume varying with closeness of packing in the measuring box.
3. Variations in packing seriously affect proportions of sand and cement in the mix.
4. Weight directly fixes the mass of each ingredient regardless of packing density.
5. Speed, cost and wet-handling are not the reason the unit gives for preferring weight batching.
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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