COOLING-SYSTEM

What is the purpose of an automobile's cooling system?

To maintain the engine's temperature at optimal levels and protect it from damage.

What can happen due to high engine temperature?

The piston may seize in the cylinder, lubricating quality of the oil may be destroyed, and preignition of the fuel mixture can occur.

What are the two main types of cooling systems for I.C. engines?

Air cooling system and liquid (or water) cooling system.

How does an air cooling system work?

Heat is conducted from the working components of the engine to the atmosphere directly using fins to increase the surface area for cooling.

What is one major disadvantage of an air cooling system?

There is uneven cooling of engine parts, leading to generally higher engine temperatures.

What is a liquid cooling system?

A method that regulates engine temperature by circulating a coolant through passages in the engine and releasing heat at a radiator.

What is the role of the thermostat valve in a liquid cooling system?

To control the flow of coolant and open at specific temperatures to maintain engine temperature.

What is the open jacket system in liquid cooling?

A cooling arrangement where a hopper surrounds the engine cylinder, allowing coolant to flow around it.

What is the thermosyphon cooling system?

A passive heat transfer mechanism that circulates water naturally based on the density difference between hot and cold water.

What are the components of a liquid cooling system?

Water pump, radiator, fan, water jackets, thermostat valve, and storage tank.

What happens when the thermostat is closed?

Coolant flow is restricted until the engine reaches the specified temperature.

What is the function of water jackets in an engine?

To cool engine components by conducting heat away from hot parts.

What are the merits of a liquid cooling system?

Uniform cooling of engine parts, improved fuel consumption, and quieter operation.

What are some demerits of a liquid cooling system?

Dependency on water supply, potential severe engine damage if the system fails, and it is costlier due to more components.

What part of the cooling system dissipates heat from the coolant?

The radiator.

What is the significance of fin surface area in an air cooling system?

Increased fin surface area enhances the heat dissipation process to the air.

What causes engine knocking?

Preignition of the fuel mixture due to high engine temperatures.