Podcast
Questions and Answers
What is the main purpose of a lubricant?
What is the main purpose of a lubricant?
- Increase friction between moving parts
- Prevent metal-to-metal contact (correct)
- Cause rubbing between surfaces
- Act as a cushion between metal parts
Which type of friction involves one surface sliding over another, as seen in plain bearings?
Which type of friction involves one surface sliding over another, as seen in plain bearings?
- Static friction
- Rolling friction
- Wiping friction
- Sliding friction (correct)
What is the function of oil film in engine operation?
What is the function of oil film in engine operation?
- Increase abrasive wear
- Promote metal-to-metal contact
- Create rolling friction
- Act as a cushion between metal parts (correct)
Which of the following is NOT a function of engine oil?
Which of the following is NOT a function of engine oil?
What percentage of the total engine cooling can be accounted for by oil cooling?
What percentage of the total engine cooling can be accounted for by oil cooling?
Which engine part does oil aid in forming a seal with to prevent gas leakage from the combustion chamber?
Which engine part does oil aid in forming a seal with to prevent gas leakage from the combustion chamber?
What is viscosity in relation to oil?
What is viscosity in relation to oil?
How is oil viscosity classified under the SAE system?
How is oil viscosity classified under the SAE system?
What does a low viscosity index indicate about oil?
What does a low viscosity index indicate about oil?
Why is it important to use approved SAE-rated oils in an engine?
Why is it important to use approved SAE-rated oils in an engine?
What does the letter 'W' signify in an SAE oil designation like 20W?
What does the letter 'W' signify in an SAE oil designation like 20W?
What do the SAYBOLT values indicate about oil viscosity?
What do the SAYBOLT values indicate about oil viscosity?
