WorksheetsIntroduction to Cooling Systems
Total questions: 30
Worksheet time: 15mins
What is one main job of a car’s cooling system?
Turn on the car radio sound
Fill the fuel tank with gas
Make wheels spin faster
Keep engine at right temperature
Look at the picture showing the fan and radiator. Which part helps move heat away from the engine by blowing air?
Yellow fan near radiator
Black dashboard buttons
Silver engine block cover
Blue coolant hoses
Why might passengers feel warm air from the vents in winter?
Heat comes from cooling system
Heat comes from the rearview mirror
Heat comes from the fuel cap
Heat comes from the car tires
Which part helps an air‑cooled engine lose heat to the air?
Thick walls keep heat inside
Small holes let hot air escape
Smooth piston sides move air away
Fins on the housing spread out heat
What moves around the engine in water cooling to carry away heat?
Wind blowing through open spaces
Coolant flowing through a water jacket
Cold metal plates touching the engine
Dry air trapped inside the cover
Which mix is used as engine coolant in water cooling?
Water with sugar and color
Water with antifreeze and additives
Water with oil and soap
Water with salt and sand
What helps move air through the radiator to carry away heat?
A bright light above the engine
A spinning fan near the radiator
A small rubber plug on pipes
A heavy metal block inside
Coolant takes heat from the engine by conduction. What does conduction mean here?
Heat appears by freezing water
Heat jumps as sparks in air
Heat moves only by loud sound
Heat passes through touching parts
The engine should stay between 90 and 105 °C. Why is this range important?
It keeps the engine working safely
It makes the engine very loud
It turns the coolant bright pink
It stops the fan from spinning fast
Look at the image. What is a typical working temperature for coolant in a water-cooled system?
One hundred degrees Celsius
Thirty-eight degrees Celsius
Twenty-seven degrees Celsius
Two thousand five hundred degrees Celsius
Look at the diagram. What does the water pump do for the engine?
Stops the fan from turning
Makes the hoses change color
Holds the radiator in place
Pushes coolant through passages
Which part spins to throw the liquid to the edge?
Main shaft cover
Cooling fan blades
Upper radiator hose
Impeller inside the pump
Where is coolant drawn into the water pump from?
Lower radiator hose
Top of the engine block
Upper radiator tank
Drive pulley belt
Which way does conventional coolant flow move past the cylinders in an engine?
Downward past the cylinders
Upward past the cylinders
Sideways across the cylinders
In circles around the cylinders
What part helps cool the hot coolant as it travels through the car?
Steering wheel column
Battery near the hood
Radiator with cooling fins
Muffler under the car
If the flow is reverse, how does it move compared to the usual way?
Only when the car is parked
A little faster than usual
The same direction as usual
The opposite direction from usual
Look at the picture. How can you tell it is a crossflow radiator?
The transmission cooler is at the bottom
The radiator is mounted horizontally
The header and return tanks are on the sides
The core tubes are vertical
Look at the diagram. Where does coolant first enter the radiator?
Transmission cooler area
Header tank at the top
Return tank at the side
Core tubes in the middle
Which part helps the radiator lose heat by having many thin fins?
Filler neck cap
Core tubes with fins
Transmission cooler pipe
Return tank shell
In a downflow radiator, which way does the coolant move?
Down through the tubes
Around in a circle
Up through the fins
Side across the tank
Some cars have a transmission fluid cooler. Where is it shown in the diagram?
Outside the filler neck
Inside the header tank
On top of the fins
Inside the return tank
What does the thermostat do when the engine is cold?
It turns off the water pump
It sends coolant to the radiator
It opens and closes the bypass port
It closes and opens the bypass port
Where does the coolant go after the thermostat opens as the engine warms up?
To the radiator and back to engine
Out of the exhaust pipe
Into the fuel tank area
Only through the bypass port
What happens to the boiling point of coolant when pressure increases in the cooling system?
It drops to a lower temperature
It goes up to a higher temperature
It stays exactly the same
It turns into ice quickly
What does the spring-loaded valve in the radiator cap do when pressure gets too high?
It cools the air outside the car
It closes to trap all coolant inside
It opens to let extra coolant escape
It makes the engine start faster
What does the expansion tank do when the coolant gets hot?
It holds extra hot coolant safely
It makes the fan spin faster
It cools the engine by itself
It turns the water pump on
When the engine cools down, what happens to the extra coolant in a closed system?
It leaks out onto the ground
It returns through a one-way valve
It stays forever in the tank
It turns into engine oil
Which hose carries water from the cylinder head to the radiator?
The tiny heater hose does this
The lower hose does this job
The fan belt does this job
The upper hose does this job
Why are engine hoses made flexible?
To keep the wheels from wobbling
To make the coolant taste good
To handle engine vibrations
To stop the fan from turning
Which statement best describes molded versus flexible hoses?
Both are cloth; they collapse quickly
Molded are pre-shaped; flexible have ridges
Molded have ridges; flexible are pre-shaped
Both are metal; neither bends easily
