Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
Which system offers the most reserve capacity if the supply of lubricant fails? |
A hydrodynamic system |
|
|
Which system or systems can provide full film lubrication at startup? |
Hydrostatic and hybrid systems |
|
|
Which system (hydrostatic or hybrid) can provide full film lubrication under full load at startup? |
Hybrid lubrication |
|
|
When an oil lift system is required, what must always be done before rotation of the journal to avoid damage to the bearing? |
Jacking oil must be brought up to pressure before rotation |
|
|
What type of lubricant film is formed to separate the rolling element from the raceway on an anti-friction bearing? |
An elasto-hydrodynamic film |
|
|
Should a bearing be packed with grease before or after it has been mounted? |
After it has been mounted |
|
|
To avoid entanglement when relubricating a machine that is running, what items should you not wear or use? |
Loose clothing Jewellry Gloves Rags |
|
|
Why should grease fittings be replaced with plugs after relubrication |
To avoid over lubriccation by unauthorized personnel |
|
|
When inspecting or cleaning around bearings while the machine is running, to what moving parts might you be exposed? |
Shaft keys Flingers Protruding set screws |
|
|
What are four benefits of keeping a machine clean? |
Allows more accurate visual inspection Allows better heat dissipation Protects the integrity of the machine by removing possible corrosive agents Reduces contamination through the breather or seals |
|
|
Why should a grease outlet be open when relubricating? |
To expel the old grease |
|
|
What should you normally check first after you discover that a bearing is persistently running at a higher than normal temperature? |
Check that the oil level is not too high or too low |
|
|
How should a soft foot check be done? |
By checking for clearance at any point under a foot when the hold-down bolt on that foot is loose and the hold-down bolts on the other feet are tight |
|
|
What are two possible ways in which oil recirculation holes and passages can be blocked? |
They can be plugged with dirt or the bearing end cover can be misaligned with the passage. |
|
|
Can a soft foot cause misalignment of an outer bearing ring with respect to the shaft? If so, Why? |
Yes, because it can distort the housing that holds the other ring |
|
|
What are the five reasons that a shaft might be abnormally hard to turn |
Seals too tight Flinger dragging on the housing Motor fan touching the housing or guard Bent shaft Insufficient clearance |
