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Week 1 Principles of Lubrication Quiz

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Questions and Answers

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?

Static friction

Rolling friction

Wiping friction

Sliding friction (correct)

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?

Increasing friction Signup and view all the answers

What percentage of the total engine cooling can be accounted for by oil cooling?

50% Signup and view all the answers

Which engine part does oil aid in forming a seal with to prevent gas leakage from the combustion chamber?

Piston rings Signup and view all the answers

What is viscosity in relation to oil?

The resistance of oil to flow Signup and view all the answers

How is oil viscosity classified under the SAE system?

Into seven groups according to viscosity at either 130 F or 210 F Signup and view all the answers

What does a low viscosity index indicate about oil?

Large change in viscosity with temperature Signup and view all the answers

Why is it important to use approved SAE-rated oils in an engine?

To ensure proper lubrication and protection Signup and view all the answers

What does the letter 'W' signify in an SAE oil designation like 20W?

Winter use suitability Signup and view all the answers

What do the SAYBOLT values indicate about oil viscosity?

Designate the viscosity of oil Signup and view all the answers