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Mixing time is specified per drum capacity. The unit prescribes a minimum mixing time of 1 minute for mixers up to which capacity?
Answer & Solution
Correct answer: A.
1. Mixing time governs how thoroughly the ingredients are blended in a batch.
2. The unit specifies 1 minute as the minimum mixing time for mixers up to 0.75 m³ capacity.
3. For every additional 0.75 m³ or fraction thereof, mixing time is increased by 0.25 minute.
4. Some mixers use a timer that prevents discharge until the prescribed time has elapsed.
5. The smaller capacity figures are not the threshold given by the unit.
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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