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Lubrication and Engine Deposits

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Questions and Answers

What is a common result of localized hot spots in hydraulic systems?

Rapid cooling of the liquid
Carbonization or sludging of the liquid (correct)
Increase in viscosity
Formation of air bubbles

Why do liquids with high viscosity have a greater resistance to heat?

Because they are more likely to break down when exposed to air
Because they have a lower boiling point
Because they are more dense and have a higher heat capacity (correct)
Because they are more prone to chemical reactions

What is a common issue with the temperature of the liquid in the reservoir of an operating hydraulic system?

It is not affected by localized hot spots
It is always higher than the actual operating temperature
It does not always represent the true state of operating conditions (correct)
It is always lower than the actual operating temperature

What can cause liquids to break down in hydraulic systems?

Exposure to air, water, salt, or other impurities (B) Signup and view all the answers

What is a characteristic of the average hydraulic liquid?

Low viscosity (C) Signup and view all the answers

What can occur when certain metals come into contact with hydraulic liquids?

An undesirable chemical reaction (A) Signup and view all the answers

What is a consequence of operating a hydraulic system at high temperatures for a considerable period of time?

Unfavorable chemical changes in the liquid (A) Signup and view all the answers

Why do localized hot spots occur in hydraulic systems?

Because of the pressure and friction at certain points in the system (C) Signup and view all the answers

What is a result of the continuous passage of a liquid through hot spots in hydraulic systems?

Local temperatures high enough to carbonize or sludge the liquid (B) Signup and view all the answers

What is a benefit of having a wide range of hydraulic liquids available?

It allows for the selection of a liquid that meets the specific requirements of a hydraulic system (C) Signup and view all the answers

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