a) Vacuum
b) High pressure
c) High Temperature
d) Low pressure
Answer: a
Explanation: In drape forming technique vacuum is used for forming. In vacuum forming, vacuum is heated below the preheated plastic sheet to draw sheet into cold mold cavity. The steps include heating the plastic sheet, placing the softened sheet is placed over a concave activity. Vacuum draws the sheet into cold cavity. The final product is then cooled.
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