Podcast
Questions and Answers
What happens when the wax in the cylinder melts?
What happens when the wax in the cylinder melts?
- The wax cools down and contracts.
- The rod retracts back into the cylinder.
- The wax evaporates and escapes from the cylinder.
- The wax expands, pushing the rod out. (correct)
How does the cooling fan in front-wheel drive cars operate?
How does the cooling fan in front-wheel drive cars operate?
- It runs constantly to maintain engine temperature.
- It is controlled solely by the engine's thermostat.
- It relies on manual operation by the driver to function.
- It activates when coolant temperature exceeds a set point. (correct)
What is the primary function of the heater core in a car?
What is the primary function of the heater core in a car?
- To circulate coolant back to the engine.
- To cool the engine by dissipating heat.
- To blow warm air into the passenger compartment. (correct)
- To draw in cold air from the passenger compartment.
Which statement about the thermostat is true?
Which statement about the thermostat is true?
What role does the heater fan play in the heating system?
What role does the heater fan play in the heating system?
What is the primary function of the cooling system in liquid-cooled cars?
What is the primary function of the cooling system in liquid-cooled cars?
Which component in a liquid cooling system determines whether fluid goes to the radiator or back to the pump?
Which component in a liquid cooling system determines whether fluid goes to the radiator or back to the pump?
What happens to the coolant when it exits the engine in a liquid-cooled car?
What happens to the coolant when it exits the engine in a liquid-cooled car?
What material is commonly used on air-cooled engines to enhance heat dissipation?
What material is commonly used on air-cooled engines to enhance heat dissipation?
What is the freezing point of a 70/30 mixture of ethylene glycol and water?
What is the freezing point of a 70/30 mixture of ethylene glycol and water?
Why is pure water not suitable as a coolant in car engines?
Why is pure water not suitable as a coolant in car engines?
What is the boiling point of a 50/50 mixture of ethylene glycol and water?
What is the boiling point of a 50/50 mixture of ethylene glycol and water?
In cars with automatic transmissions, what is typically used to cool the transmission fluid?
In cars with automatic transmissions, what is typically used to cool the transmission fluid?
What is the primary function of creating turbulence in the fluid flow through the tubes?
What is the primary function of creating turbulence in the fluid flow through the tubes?
How much does a radiator cap typically increase the boiling point of coolant?
How much does a radiator cap typically increase the boiling point of coolant?
What mechanism does the radiator cap use to control the cooling system's pressure?
What mechanism does the radiator cap use to control the cooling system's pressure?
At what temperature does the thermostat begin to open and allow fluid to flow through the radiator?
At what temperature does the thermostat begin to open and allow fluid to flow through the radiator?
What happens when the temperature of the coolant reaches above 93 C?
What happens when the temperature of the coolant reaches above 93 C?
What does the pressure from the radiator cap do when the cooling system heats up?
What does the pressure from the radiator cap do when the cooling system heats up?
What role does the small cylinder in the thermostat play?
What role does the small cylinder in the thermostat play?
What happens to the coolant when the pressure in the system exceeds 15 psi?
What happens to the coolant when the pressure in the system exceeds 15 psi?
What is the primary function of the water pump in an engine?
What is the primary function of the water pump in an engine?
Which component helps to reduce the heat transferred from the combustion chamber to the engine parts?
Which component helps to reduce the heat transferred from the combustion chamber to the engine parts?
What temperature can the combustion chamber of an engine reach?
What temperature can the combustion chamber of an engine reach?
What material is most commonly used in modern car radiators?
What material is most commonly used in modern car radiators?
How do turbulators function within the radiator's tubes?
How do turbulators function within the radiator's tubes?
What occurs if the engine goes without cooling for an extended period?
What occurs if the engine goes without cooling for an extended period?
What is the purpose of the passageways in the engine block and cylinder head?
What is the purpose of the passageways in the engine block and cylinder head?
What is the result of welding of the piston to the cylinder?
What is the result of welding of the piston to the cylinder?
Flashcards
Liquid Cooling
Liquid Cooling
Engine cooling system that uses a fluid to absorb and transfer heat.
Air Cooling
Air Cooling
Engine cooling system that uses air to conduct heat away.
Antifreeze
Antifreeze
Mixture of water and ethylene glycol preventing freezing and boiling.
Water Pump
Water Pump
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Coolant
Coolant
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Engine Block
Engine Block
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Radiator
Radiator
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Thermostat
Thermostat
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Cooling Fan
Cooling Fan
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Pressure Cap
Pressure Cap
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Overheating
Overheating
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Ethylene Glycol
Ethylene Glycol
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Cylinder Head
Cylinder Head
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Fluid Circulation
Fluid Circulation
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Engine Temperature
Engine Temperature
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Radiator Fins
Radiator Fins
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Coolant Passages
Coolant Passages
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Heating System
Heating System
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Thermostatic Switch
Thermostatic Switch
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Study Notes
###Â Liquid Cooling Systems
- Liquid-cooled engines use a fluid to absorb heat from the engine
- The fluid is circulated through pipes and passageways in the engine
- After leaving the engine, the fluid passes through a radiator to transfer heat to the air
- The fluid used is a mixture of water and ethylene glycol, known as antifreeze
- Antifreeze lowers the freezing point and raises the boiling point of the water
###Â Air-Cooled Systems
- Air-cooled engines use aluminum fins on the engine block to conduct heat away from the cylinder
- A fan forces air over the fins to cool the engine
###Â Plumbing
- The water pump circulates fluid throughout the engine
- The fluid travels through passages in the engine block and cylinder head
- The thermostat regulates fluid flow through the radiator to maintain engine temperature
- A separate circuit for the heating system draws fluid from the cylinder head
- Some cars have a separate circuit for cooling the transmission fluid
###Â Fluid
- Ethylene glycol is added to water to lower the freezing point and raise the boiling point of the coolant
- The temperature of the coolant can reach 121 to 135°C
- Additives in antifreeze act as corrosion inhibitors
###Â Water Pump
- The water pump is a centrifugal pump driven by a belt connected to the crankshaft
- It circulates fluid throughout the engine whenever the engine is running
###Â Engine
- The engine block and cylinder head have passageways for coolant flow
- Coolant is circulated to the most critical areas of the engine, particularly around the cylinders and exhaust valves
- Overheating can cause the engine to seize, leading to engine damage
###Â Radiator
- The radiator is a heat exchanger that transfers heat from the coolant to the air
- Aluminum radiators use fins to increase surface area for heat transfer
- Turbulators inside the tubes increase fluid turbulence for more efficient heat exchange
###Â Pressure Cap
- The radiator cap increases the boiling point of the coolant by increasing pressure
- The cap is a pressure release valve that allows coolant to escape if the pressure reaches 15 psi
- The overflow tank collects excess coolant
###Â Thermostat
- The thermostat regulates the amount of coolant flowing through the radiator
- It is a valve that opens and closes based on the temperature of the coolant, allowing the engine to reach operating temperature quickly and maintain a constant temperature
###Â Cooling Fan
- The cooling fan is controlled by a thermostatic switch or by the engine computer
- Electric fans are used on front-wheel drive cars because the engine is mounted transversely
###Â Heating System
- The heater core is a small radiator located behind the dashboard
- The heater fan blows air through the heater core and into the passenger compartment
- The heater works regardless of whether the thermostat is open or closed
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Description
Test your knowledge on liquid and air cooling systems used in engines. Explore the principles of heat transfer, the role of antifreeze, and the plumbing involved in engine cooling. Understand the differences between liquid-cooled and air-cooled engines and their respective components.
