What is the primary function of oil in an engine?

• To increase fuel efficiency

• To provide lubrication

• To prevent rust

• To improve engine aesthetics

How does oil reduce friction between metal surfaces?

• By chemically altering the surfaces

• By creating a film between the surfaces

• By increasing the temperature of the components

• By absorbing metal particles

What is boundary lubrication?

• When oil is supplied under pressure

• When oil is supplied by splashing or misting

• When no lubrication is provided

• When oil prevents rust

What happens if the lubricant film breaks down?

• The engine runs more efficiently

• The engine cools down

• Rapid wear and potential engine seizure occur

• Oil consumption decreases

Which of the following is NOT a function of engine oil?

• Cooling the engine

• Cleaning engine parts

• Preventing rust

• Improving fuel quality

What is viscosity?

• The thickness of the oil

• The oil’s ability to flow

• The oil’s temperature resistance

• The oil’s chemical composition

What tool is used to measure oil viscosity?

• Thermometer

• Viscometer

• Hydrometer

• Pressure gauge

What is the role of detergent oils?

• To improve lubrication under high pressure

• To keep contaminants suspended and reduce sludge buildup

• To increase oil viscosity

• To lower oil temperature

Why is it important to regularly change engine oil?

• To improve vehicle resale value

• To prevent oil degradation

• To reduce the need for other maintenance

• To comply with fuel standards

What is the purpose of an oil pressure relief valve?

• To filter out contaminants

• To maintain safe oil pressure

• To increase oil temperature

• To clean the oil filter