In a rotary drier, the average retention time of solid is(where Z = le – McqOptions

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1.	In a rotary drier, the average retention time of solid is(where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier cross-section H = hold up of solid.)
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

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