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What is/are the major difference(s) between disc and turbine type stirrer?

Blades in disc type are projected out beyond the edge of disc while blades are curved one in turbine type
Turbine type requires 50 % less air than disc type for the same yield and energy consumption
Both (a) and (b)
Number of blades in the stirrer

Correct Answer: Both (a) and (b)

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