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Coarse aggregate is cooled by inundation in a tank of chilled water. With water at 2 °C, even 15 cm top-size aggregate can be cooled to about 3 °C in a circulating time of approximately:
Answer & Solution
Correct answer: A.
1. The inundation tank is open-topped with a conical bottom and a watertight discharge gate.
2. Chilled water at 2 °C is circulated through the aggregate held in the tank.
3. The unit reports that 15 cm top-size aggregate is cooled to about 3 °C with a circulating time of 45 minutes.
4. The full filling and discharging cycle takes about 2 hours per batch.
5. The other times misstate the circulating time given by the unit.
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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