How many zones through which the charge passes in a rotary kiln ?
Correct answer: A. 4
- A. 4
- B. 3
- C. 2
- D. 5
Explanation
In a cement rotary kiln, the charge passes through four functional zones: drying or preheating, calcination, burning or clinkering, and cooling. These zones provide gradual removal of moisture, decomposition of carbonates, clinker formation and cooling. The likely mistake is choosing three by combining the drying and preheating stages into one zone.
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About Polymers
Polymers are large molecules made from repeating monomer units joined by covalent bonds. The topic distinguishes addition polymers such as polyethylene, PVC and polystyrene from condensation polymers such as nylon and polyester, and relates chain structure to thermoplastics, thermosetting polymers, elastomers, properties, uses and environmental concerns.
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