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Pan-type concrete mixers consist of an open pan and a rotating star of blades, with the star and pan moving in opposite directions. The unit describes these mixers as:
Answer & Solution
Correct answer: D.
1. Pan mixers force the mix between counter-rotating blades and the pan wall.
2. This shear action makes them very efficient on stiff, low-workability mixes.
3. The unit notes they are difficult to maintain and transport, limiting site use.
4. In some pan mixer models the pan is stationary and only the blade star rotates.
5. They are not used for very large aggregate, which the drum types handle.
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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