how well do you know your bearings

7/28/2019 How Well Do You Know Your Bearings

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How Well Do You Know Your Bearings?

The following 20 questions are from the Rolling Bearings Troubleshooter's Guide

on CD-ROM. Use this quick mini-quiz to test your bearings knowledge.

1. What is the most important feature of lubrication that determines the life of a bearing?

(a) viscosity

(b) grade of grease

(c) E.P. additives(d) viscosity index

2. What two items are used to determine the proper oil viscosity for a bearing?

(a)bearing width and bearing speed

(b)bearing speed and bearing outside diameter

(c)bearing width and bearing bore(d)bearing speed and bearing pitch diameter

3. How high should oil be in a split pillow block housing?

(a) 1/4 from the bottom

(b) at the split

(c) center line of bottom most roller(d) center line of shaft

4. For high temperature (300 Degrees Fahrenheit) applications, what is the preferred

method of lubrication?

(a) circulating oil with a heat exchanger

(b)polymeric matrix type lubricant

(c) lithium grease(d) static oil lubrication

5. One advantage of oil in a split pillow block is that it:

(a) is less likely to leak

(b) is easier to change than grease(c) improves the efficiency of the labyrinth enclosures

(d) minimizes axial thrust

6. For lubricating high speed bearings, use:

(a)polymeric matrix types lubricant

(b) grade 2 grease(c) oil

(d) grade 3 grease

7. Dry sump in a pillow block is used for:

(a) high speed

(b) low speed

(c) hot applications
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(d) cool applications

8. The temperature of the oil is how much hotter than the housing?

(a) 20 degrees Fahrenheit

(b) 30 degrees Fahrenheit

(c) 50 degrees Fahrenheit(d) same temperature

9. How often should grease be changed in a split pillow block?

(a) every 2 months

(b) every 6 months

(c) once a year(d) never

10. Static oil should be changed in pillow block every:

(a) 3 months

(b) 6 months(c) 1 year(d) 2 years

11. When condensation occurs in an oil lubricated split pillow blow, what occurs to the

bearing?

(a) fretting corrosion

(b) static corrosion(c) cavitation

(d) none of the above

12. Maximum temperature to heat a bearing for mounting on a shaft is:(a) 180 degrees Fahrenheit

(b) 212 degrees Fahrenheit(c) 250 degrees Fahrenheit

(d) 320 degrees Fahrenheit

13. Before mounting a ball bearing on a shaft, check the:

(a) shaft diameter

(b)bore of bearing(c)bearing internal clearance

(d) thrust clearances

14. When calculating shaft size for a press fit, use a C/P value of:

(a) 6

(b) 10(c) 12

(d) 14

15. A sine bar is used:
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(a) to align bearing

(b) to measure length of a tapered seat

(c) with a micrometer to measure a straight shaft diameter(d) with a micrometer to measure a tapered shaft diameter

16. Nicks on a shaft shoulder:

(a) are meaningless

(b) can cause misalignment of the inner ring

(c) can cause interference fit on a shaft(d) can cause misalignment on the outer ring

17. An internally preloaded bearing can result from:

(a) too much thrust load

(b) too much radial load

(c) undersize journal(d) too much press fit on the inner ring

18. Conformity of a sine bar to a tapered shaft must be at least:

(a) 60%

(b) 80%

(c) 95%(d) 100%

19. When radial clearance reduction cannot be measured on a spherical roller bearing,

axial travel up the taper can be measured. For every .001 reduction in radial clearance on

a 1:12 tapered solid journal, the axial travel is:

(a) .012

(b) .016(c) .020

(d) .024

20. When heating a 6218 2RS bearing:

(a) first remove the seals(b)place bearing on wire grid in a container of oil

(c)place bearing on an induction heater

(d)preheat the shaft

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Ball bearing: Quiz

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