Industrial seal self study guide - SKF.com

19. _________________ are dual face mechanical seals used where both positive
lubrication and dirt exclusion are required.
❑ a. Waveseals
❑ b. V-Rings
❑ c. HDDF seals
❑ d. Retention seals
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20. Selecting the right seal for a particular application depends on _________________ .
❑ a. size and speed
❑ b. pressure and temperature
❑ c. fluid compatibility
❑ d. all of the above
21. The V-Ring is an all-rubber seal that _________________ .
❑ a. mounts directly on the shaft by hand
❑ b. is sealed axially against a counterface, housing bearing race
or similar surface
❑ c. acts like a mechanical face seal, radial lip seal or slinger
❑ d. all of the above
22. Installation of a Large Diameter Wear Sleeve without any
machining _________________ the effective shaft diameter.
❑ a. reduces
❑ b. increases
❑ c. will never change
❑ d. none of the above
23. Pressures exceeding seal design limitations can cause _________________ .
❑ a. seal rupture
❑ b. inverted lips
❑ c. lubricant leakage
❑ d. all of the above
24. Heavy-duty mechanical seals (HDDF) _________________ .
❑ a. retain lubricants
❑ b. exclude contaminants
❑ c. can be used under severe service conditions
❑ d. all of the above
25. 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
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