For the production of very high vacuum, a _____________ pump is normally used?
Correct answer: A. Diffusion
- A. Diffusion
- B. Centrifugal
- C. Jet ejector
- D. Piston
Explanation
A diffusion pump uses vapour jets to entrain gas molecules and can produce very high vacuum after a backing pump has lowered the initial pressure. Centrifugal and piston pumps are not used for this vacuum range.
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