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A screw press or expeller extracts oil by

  • A.Compressing the meal against a choke
  • B.Dissolving the oil in a solvent
  • C.Centrifuging the crushed seed
  • D.Boiling the seed in water

Answer: A

The worm shaft reduces the volume available as the material advances, and the oil escapes through slots in the barrel while the cake leaves at the choke. Adjusting the choke changes the pressure and so the residual oil in the cake.

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