Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise) ?
Correct answer: C. Helical screw
- A. Propeller
- B. Flat blade turbine
- C. Helical screw
- D. Curved blade turbine
Explanation
A helical-screw agitator has a large blade area and produces strong axial movement at low speed, making it suitable for very viscous liquids. Propellers and turbines are generally better for lower-viscosity fluids.
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