Lubrication Fundamentals

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Questions and Answers

Which lubricant property is most indicative of its ability to sustain a heavy load at low speed?

  • Pour point
  • Viscosity (correct)
  • Viscosity index
  • Density

What are the two primary functions of lubrication?

  • Friction and heat
  • Heat and corrosion
  • Flash point and fire point
  • Friction and wear (correct)

Which characteristics describe a semi-solid lubricant?

  • Seals out dirt/water and cannot be used at high temperatures
  • Suitable for high temperatures and can be filtered
  • Can be filtered and cannot be used at high temperatures
  • High viscosity and ability to seal out dirt/water (correct)

In which of the following climates should oils with a low pour point be used?

<p>Cold climates (A)</p> Signup and view all the answers

For what applications are high viscosity oils typically used?

<p>Low speed, high load (D)</p> Signup and view all the answers

Which property is crucial for oil used in a refrigeration compressor?

<p>Low pour point (A)</p> Signup and view all the answers

What type of chemical compounds are often added to lubricating oils to prevent oxidation?

<p>Antioxidants (B)</p> Signup and view all the answers

Which type of lubrication requires continuous motion to completely separate bearing surfaces?

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What is a key characteristic of fluid film lubrication?

<p>Effectively separates the metal surfaces (B)</p> Signup and view all the answers

What type of lubricant is suitable for use in an anti-friction bearing?

<p>A semi-solid lubricant (C)</p> Signup and view all the answers

Flashcards

Viscosity

The measure of a fluid's resistance to flow. High viscosity means it's thick and flows slowly.

Lubrication functions

Reducing friction minimizes wear and the generation of heat between moving surfaces.

Semi-solid lubricant

A lubricant that is between a solid and a liquid. Used to seal out contaminants.

Pour point

The lowest temperature at which a fluid will pour or flow. Important in cold environments.

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High viscosity oils

Used where there are slow speeds and heavy loads. High Viscosity = High Load.

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Oxidation prevention

To prevent oil oxidizing, chemical compounds are added to the lubricant.

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Fluid film lubrication

A lubrication regime where a fluid film completely separates the surfaces. Requires motion.

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Fluid film lubrication

Also called flooded lubrication where the metal surfaces are fully separated.

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Anti-friction bearing

A bearing that uses balls or rollers to reduce friction; lubrication can be semi-solid.

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Installing bearings incorrectly

Can cause cracking or breaking of the balls inside a bearing.

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Study Notes

  • The lubricant characteristic indicating its ability to support a heavy load at low speed is viscosity.
  • The two most important functions of lubrication are the reduction of friction and wear.
  • A semi-solid lubricant has a high viscosity and seals out dirt and water from bearings.
  • Oils with a low pour point should be used in cold climates.
  • High viscosity oils are normally used for low speed, high load applications.
  • The oil for a refrigeration compressor must have a low pour point.
  • Chemical compounds are often added to oil lubricants to prevent oxidation.
  • Fluid film lubrication requires continual shaft/surface rotation/motion to completely separate the bearing surfaces.
  • Fluid film lubrication is also called flooded lubrication.
  • The lubricant for an anti-friction bearing could be a semi-solid lubricant.
  • Applying forces through the balls of a bearing during installation can cause cracking or breaking of the balls.
  • An anti-friction bearing has rolling friction and could be a thrust bearing.
  • The ability of an oil to lift and support heavy loads depends upon hydraulic pressure.
  • A normal antifriction bearing maximum operating temperature range is 80°C to 120°C.
  • Single stage reciprocating air compressors could have two or more cylinders.

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