Industrial seal self study guide - SKF.com

Chapter 4 Review
To take this test, simply place a card or sheet of paper under the first question. After
you’ve read it (and answered it to yourself) slide the paper down below the next question.
The correct answer to the first problem will appear directly to the right of the new
question. Be sure not to skip any questions.
1 . Simultaneous exclusion and retention is best performed with _________________ .
❑ a. a combination of two seals back to back
❑ b. single lip design seals
❑ c. a combination of two seals front to back
❑ d. V-Ring seals
1. A
2. _________________ is the most popular material for the majority
of sealing applications today.
❑ a. Leather
❑ b. Felt
❑ c. Nitrile
❑ d. Silicone
3. Polyacrylates _________________ .
❑ a. are compatible with high operating temperatures
❑ b. offer high resistance to oxidation and ozone
❑ c. may be used with water
❑ d. both a. and b.
4. Before the invention of nitriles, _________________ was the most common
sealing element.
❑ a. rubber
❑ b. felt
❑ c. leather
❑ d. metal
5. Popular sealing lip synthetics in use today include _________________ .
❑ a. nitriles
❑ b. fluoroelastomers
❑ c. fluoropolymer (PTFE)
❑ d. all of the above
6. Advantages of polyacrylates include _________________ .
❑ a. good compatibility with most oils
❑ b. high resistance of oxidation and ozone
❑ c. better compatibility with high temperatures than nitrile
❑ d. all of the above
2. C
3. D
4. C
5. D
6. D
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