What is the primary function of antifreeze in an engine's cooling system?

To prevent the engine from overheating and freezing.

To lubricate engine components.

To increase the engine's horsepower.

To clean the engine's internal parts.

Why is water alone not an ideal coolant for an engine?

It can boil over in extreme heat and freeze, expanding and damaging the engine in extreme cold.

It causes the engine to run too cold.

It is too expensive to use regularly.

It does not mix well with other engine fluids.

What are the main chemical components of antifreeze and how do they affect the water mixture?

Ethylene glycol or propylene glycol, which lower the freezing point and raise the boiling point.

Ethanol, which makes the water more corrosive.

Methanol, which increases the water's density.

Sulfuric acid, which helps to clean the engine.

What is the correct path of coolant through an engine's cooling system?

Water pump -> Engine block -> Cylinder head -> Thermostat -> Radiator.

Radiator -> Water pump -> Engine block -> Cylinder head -> Thermostat.

Cylinder head -> Radiator -> Water pump -> Engine block -> Thermostat.

Thermostat -> Water pump -> Radiator -> Engine block -> Cylinder head.

What happens to the coolant when the thermostat is closed?

It flows directly back to the pump.

It flows directly to the radiator.

It is expelled from the system.

What is the main purpose of a turbulator in a radiator tube?

To increase the turbulence of the fluid for more effective cooling.

To prevent fluid from freezing.

To increase the flow rate of the coolant.

To reduce the overall weight of the radiator.

What is one primary function of the radiator cap in a cooling system?

To increase the boiling point of the coolant.

To release air from the system.

To filter impurities from the coolant.

To regulate the flow of coolant to the engine.

Cooling system theory ppt Lesson

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