Industrial seal self study guide - SKF.com

33. A hammer blow without any material to absorb the shock wave _________________ .
❑ a. may interfere with the action of the seal lip
❑ b. can dislodge the garter spring from its proper operating position
❑ c. both of the above
❑ d. none of the above
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34. To assure a smooth sealing surface, the shaft should be ground
with _________________ rpm ratios.
❑ a. even number (2 to 1)
❑ b. odd number (3 to 1)
❑ c. mixed number (3.5 to 1)
❑ d. none of the above
35. If the same size replacement is not available, _________________ .
❑ a. select a narrower seal
❑ b. select a wider seal
❑ c. select a different lip material
❑ d. either a. or b.
36. Before the invention of nitriles, _________________ was the most
common sealing element.
❑ a. rubber
❑ b. felt
❑ c. leather
❑ d. metal
37. For best seal performance, use a(n) _________________ or soft-face hammer
for seal installation.
❑ a. screwdriver
❑ b. arbor press
❑ c. chisel
❑ d. steel hammer
38. _________________ refers to the amount by which the shaft does
not rotate around the true center.
❑ a. Shaft-to-bore misalignment
❑ b. Dynamic run-out
❑ c. Shaft diameter
❑ d. none of the above
39. If the shaft is deeply scored, you should fill the groove with _________________ .
❑ a. powdered metal epoxy type filler
❑ b. non-hardening sealant
❑ c. grease
❑ d. SAE 30 oil
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