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Non-tilting drum mixers are limited to aggregates up to about 75 mm size primarily because:
Answer & Solution
Correct answer: C.
1. Non-tilting mixers discharge through the same opening used for charging.
2. The discharge chute is a sized component whose throat sets the maximum particle size.
3. The unit reports that aggregates above 75 mm are liable to damage the discharge chute.
4. Mixing in a non-tilting drum is by both rolling and falling action from internal blades.
5. Drum speed, blade wear and cleanability are not the size-limiting reasons listed.
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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