a) 2:1, 3:1
b) 1:2, 4:1
c) 2:1, 4:1
d) 1:2, 1:3
Answer: c
Explanation: Compression ratios for single screw extrusion should lie between 2:1 and 4:1. Compression ratio is an important parameter for any extrusion process. Compression ratio is the ratio of the volume of one flight of the screw at the in-fees end to the volume of one flight at the die end.
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