Do You Know How an Engine Works?

By: Dave Davis
Estimated Completion Time
5 min
Do You Know How an Engine Works?
Image: Unsplash by Erik Mclean

About This Quiz

While you don't have to know how to build a clock to tell what time it is, it is helpful to know how your engine works before you jump into the car and take off. Do you have a clue what's going on under the hood when you press down on the gas pedal? This quiz is designed to test your knowledge of the machine that makes traveling from place to place in your daily commute easier and safe. 

Should you be able to tear down and rebuild a motor before you get a driver's license? Nah. If that was the case, the roads would be deserted except for a select few mechanical geniuses! Knowing the basics of how the internal combustion engine operates, however, can be extremely valuable. Not only will you be able to have an intelligent conversation with your mechanic when your car needs servicing, but you'll also be able to avoid some of the damage that can occur to an engine operated by a neglectful owner. While the modern engine is a wonder of mechanical science, it still needs some love every now and then! 

Are you the kind of owner who can show it that love? 

We bet you are, and you can prove you know more than the average motorist by scoring high on this quiz! You'll never need to field strip and clean your engine, but we think you know how to keep your motorized buddy happy and on the road. Prove us right by taking this quiz! Let's do this!

Filter When you get your oil changed (or change it yourself), this part also needs to be replaced. Which of these parts fits that description?
The oil pan
The oil filter
The oil filter can hold about a quart of oil on its own, so when the vehicle's oil is changed, this part needs to be changed out as well; otherwise, a sizable amount of dirty oil will contaminate the nice, clean lubricant that was just put in.
The dipstick
The oil temperature sensor

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Piston What is the name of the part in the cylinder that moves up and down, transforming the energy of the fuel into motion?
Reciprocating cam
Motivator
Piston
The pistons travel up and down the cylinder shaft, driven by the internal combustion process. They are forced down the cylinder by the explosion, and then compress the fresh fuel/air mix as they return up toward the cylinder head.
Pushrod

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Water pump The name might be a little misleading, but which of these devices moves coolant around your engine?
Fuel pump
Oil pump
Water pump
Although modern cars are much more likely to use antifreeze than water in the coolant system, the water pump is the device that keeps things moving. If the water pump — which can be either electrical or mechanical — goes out, your car is about to heat up in a bad way.
Air pump

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Exhaust What structure does exhaust gas flow through when leaving the engine?
The exhaust manifold
After the internal combustion process, the spent gases must be removed to make room for the fresh fuel/air mixture. These gases go through the exhaust valve(s) of the cylinder and then leave the engine by flowing through the exhaust manifold.
The muffler
The outgassing control port
The EPS conduit

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Dashboard Which of these is the "brain" of the modern automobile?
The Multi-Velocity Processor (MVP)
The Neural-Net Processor (NNP)
The Isolinear Core Processor (ICP)
The Engine Control Unit (ECU)
The Engine Control Unit, or ECU (also known as the DME, DDE and by other names), is the computer that your car uses to maintain proper working order. This processor takes information from various sensors around the engine and the rest of the car to make decisions about fuel allocation and other factors.

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Clutch Which of these structures connects the engine to the transmission in a manual transmission vehicle?
The clutch
When you shift gears in a car with a manual transmission, you are using the clutch to disengage the engine from the transmission while you change which gear the transmission is using. This is a smooth process for experienced drivers. With drivers who are just learning to use the clutch, however, you're going to get jerked around a bit until they get the hang of it.
The camshaft
The Johnson rod
The connecting rod

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Distributor The distributor cap did its job for many, many years, but it was eventually replaced by which of these parts?
Fuel injectors
Ignition coil
Each cylinder in your modern car has its own ignition coil, which sends the necessary electricity to each spark plug to ignite the fuel/air mix and drive the pistons. This job used to be accomplished by the distributor cap and points. Time, however, marches on.
Lithium-ion batteries
Superchargers

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Timing Which of these devices keeps the camshaft and the crankshaft in sync?
Piston guard
Cam chain
Timing belt
The timing belt connects the camshaft and the crankshaft to keep the two elements in sync. The crankshaft rotates twice for every time the camshaft rotates, and they must work in harmony so that the valves open and close at the right moment in the four-stroke cycle.
Synchronizing sensor

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V8 In the internal combustion engine, which of these is the correct order of the combustion process?
Exhaust, power, compression, intake
Intake, compression, power, exhaust
The four-stroke internal combustion engine first takes in the fuel/air mix, then compresses it. The compressed mixture is then ignited, releasing its power and moving the piston. Finally, the exhaust gases are removed and the process starts again.
Intake, power, compression, exhaust
Power, exhaust, compression, intake

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Flywheel This device stores rotational energy for use by the engine — can you name it?
The battery
The flywheel
Since the internal combustion process is uneven, stored rotational energy can be a huge help in evening out the ride. In a car's engine, this is accomplished by the flywheel, which spins with the crankshaft and aids in keeping the spinning going at a more consistent rate.
The lithium-ion storage unit (LiSU)
The alternator

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Torque When an engine has high torque, what does this mean?
It can maintain top speed for longer.
It can accelerate quickly.
Torque is a measure of turning power and is usually measured in foot-pounds (or Newton-meters). Just as horsepower is a measure of engine power, torque is a measure of how quickly the vehicle can accelerate.
It can drift easily.
It's faster than a car with lower torque.

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Fuel injectors Which of these parts took the place of the carburetor in modern cars?
Distributors
Overhead cams
Sodium Filled Valves
Fuel injectors
In older vehicles, the carburetor was in charge of creating the fuel/air mixture necessary for the internal combustion process. In modern cars, this duty is filled by the fuel injectors, which keep the fuel and air separate until they enter the cylinder chamber, giving it a more consistent flow.

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Starter Which auxiliary motor does your car's engine need to get going?
Crankshaft motor
Cylinder motor
Blower motor
Starter motor
The starter motor is an electric engine that gives the initial boost that causes the automobile's engine to turn over for the first time and get the internal combustion process started. Before they became a standard part of the car, drivers had to use a crank to get the engine started.

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Crankshaft Which part turns the linear motion of the pistons into rotational force that can be used by the wheels?
Crankshaft
Connected to the pistons by the hinged — and logically named — connecting rods, the crankshaft is rotated by the pistons' linear motion and transmits this motion to the transmission, which ultimately moves the wheels.
Camshaft
Flywheel
Transmission

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Radiator What scientific principle do radiators use to cool the engine?
Evaporation
Refrigeration
Sublimation
Heat exchange
The radiator operates by allowing hot engine coolant to flow through small tubes and come into contact with moving air (from the car being in motion and/or the radiator fan). The air cools the fluid, drawing away some of the engine's heat, and keeps the engine from overheating.

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MAS At what point in the internal combustion process does the Mass Air Flow sensor take its readings?
The exhaust process
The combustion process
The compression process
The intake process
The Mass Air Flow sensor reads how much air is flowing into the engine at any given moment and helps the car's onboard computer determine how much fuel is needed to achieve the desired level of power. The computer will start throwing warning lights and the car will not run smoothly if this part gets contaminated or its electronics fail.

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Headers When you add headers to an engine, what system are you augmenting?
The fuel injection system
The cooling system
The exhaust system
Exhaust headers are one of the most common aftermarket accessories used by people who want to get some extra pep out of their engine. They work by giving each cylinder its own exhaust system rather than using a common exhaust manifold. This helps to eliminate backpressure and ups the engine's horsepower and torque capabilities.
The air intake system

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Freeze plug Where are freeze plugs usually located in a car?
The radiator
The A/C compressor
The engine block
Freeze plugs are usually found on the back, the side or underneath the engine block, and help to relieve pressure inside the block in freezing conditions. When water freezes and expands, the freeze plugs give the pressure a safe place to go.
Underneath the passenger compartment

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Serpentine belt Which of these directly drives the alternator as it provides electricity to the car?
Electromagnets
The serpentine belt
The serpentine belt is connected to many components in your car's engine, including the alternator. By putting it in motion, the serpentine belt allows the alternator to generate electricity for the car's systems and makes sure the battery is properly charged. Older cars may have an alternator belt which just handles that part.
The battery
The engine's fan

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Head gasket What is the function of the head gasket?
To separate the cylinder head from the engine block
To maintain maximum compression in the combustion process
To keep fluids and other elements from mixing
All of the above
The head gasket is what separates the cylinder head from the engine block, allowing the two elements to work together and form a tight combustion chamber. Water, oil, fuel and exhaust gases also flow through the proper channels in the head gasket. When there's something wrong with this gasket, the engine quickly starts to display symptoms.

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Valves Your engine has these two types of valves. Can you name them?
Bait and switch
Catch and release
Intake and exhaust
The intake valves allow the fuel/air mixture to be injected into each cylinder for the internal combustion process, and then the exhaust valves release the spent gases to make room for the next cycle. Each cylinder, by the way, may have more than one of each valve.
Income and outgo

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Mount If this part starts to fail, the entire car will start to feel the engine's vibrations. Which part are we talking about?
The struts
The shock absorbers
The engine mount
The engine and transmission are held in place in the car's frame by a series of mounts. These mounts are rubberized and, if they get worn and start to fail, the entire passenger compartment will start to feel the vibration of the engine, giving the riders an unwelcome massage.
The vibrational dampeners

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Camshaft sensor How does the camshaft position sensor work to ensure the proper function of your engine?
It tells the car's computer if the camshaft is in good working order.
It tells the car's computer where the camshaft is in its rotation.
The camshaft position sensor tells the car's computer when to release fuel to each cylinder by letting it know what position the camshaft is currently in. If this sensor starts to give bad readings, the spray of fuel will be incorrect and the engine will not run properly.
It keeps the camshaft and the crankshaft in sync.
It maintains proper airflow through the intake manifold.

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Piston rings How many rings does each piston have in your car's engine?
None
1
2
3
The pistons in an automotive engine typically have three rings. The top two rings aid in compression, making a tight fit between the piston and the cylinder wall while the ring aids in controlling oil and dissipating heat generated in the combustion process.

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Camshaft The job of opening and closing valves in the operation of an engine falls to the ...
Tappets
Crankshaft
Camshaft
The camshaft, which rotates in time with the crankshaft, opens and shuts the valves going to the cylinders through the use of offset lobes (or cams). This keeps everything moving in the proper order throughout the internal combustion process.
Cylinder head

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Thermostat How does the thermostat affect the temperature of the engine?
By sending temperature information to the car's computer
By blocking the flow of coolant when it's not needed
The thermostat in your car's engine is actually a valve that stays closed when the engine first starts and then opens when the engine is warm enough to need the flow of coolant to draw the heat away. If this part gets stuck, the engine can easily overheat.
By absorbing heat generated by the combustion process
By cooling the antifreeze when it reaches a certain temperature

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Tachometer It's on the dashboard of most cars, but what does the tachometer actually measure?
The rotational speed of the tires
How many times a second the pistons move
The rotational speed of the crankshaft
The tachometer is a gauge that measures how many times the crankshaft revolves in a minute (revolutions per minute, or RPM). At idle, the tachometer generally reads about 1,000 RPM for most cars.
The velocity of air coming into the engine

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Spark plugs True or false: The gap at the end of each spark plug needs to be precisely set.
True — each car has its own requirements.
When it comes to an internal combustion engine, timing is everything, and that includes the time it takes for a spark to travel between the electrodes of a spark plug to ignite the fuel/air mix in the cylinder. The gap at the end of each spark must be set to the exact distance specified by the manufacturer for the engine to run properly.
False — they are pre-set in manufacturing.
False — there is no gap at the end of a spark plug.
It depends — only performance cars need a precise setting.

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Hemi engine When an engine is referred to as a "Hemi," what does that actually describe?
The shape of the cylinder head
The top of the combustion chamber of a Hemi engine are hemispherical (rather than flat), giving the engine its name. While hemi engines are more complex and more expensive, they can generate more power than a regular engine of the same size.
The shape of the cylinder body
It's an engine brand name.
It's a diesel engine.

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Heater core What is the function of the heater core?
Puts engine heat to work in the cabin
The heater core is an ingenious bit of engineering, taking what would have otherwise been wasted heat and putting it to work to warm the passenger compartment and operate the defroster. It does this by taking some of the heat from the engine coolant and putting it to work.
Warms the engine on cold days
Dissipates engine heat to the outside air
Warms the oil to help it flow through the engine

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Turbo How does a turbocharger add to the engines' power output?
It injects nitrous oxide into the fuel/air mix.
It injects extra fuel into the cylinder.
It enlarges the cylinder.
It forces more air into the combustion chamber.
A turbocharger is a turbine that increases the engine's power output by forcing compressed air into the cylinder — more air means more fuel can be introduced, which leads to bigger explosions and more power.

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Driving When you want to go faster, you press on the accelerator pedal. What actually happens when you do this?
You allow more air into the engine.
The accelerator pedal actually controls the engine's throttle (the mechanism that controls how much air is entering the engine). When you allow more air in, more fuel is added to the mix, and the vehicle goes faster. The "gas" pedal is actually the "air" pedal.
You increase the fuel pressure.
You tell the car's computer that you want more power.
You increase the radius of the cylinder.

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W16 Which of these is NOT an engine cylinder configuration?
H
The most common engine configurations for automobiles are inline, or I, meaning the cylinders are in a straight line, and V (V6, V8), meaning the engine has two banks of cylinders that resemble the letter "V." Less common, but still in existence, are the "W" engines, which have three banks of cylinders that resemble that letter.
V
I
W

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O2 Sensors Where is the oxygen sensor in the modern car mounted?
Near the catalytic converter
The car's oxygen sensors help with the smooth operation of the car's engine, even though they are located near the catalytic converter. These sensors detect how much unused oxygen is present in the engine's exhaust and help the vehicle's computer better calibrate how much fuel is needed for the fuel/air mix.
Near the intake manifold
Near the exhaust manifold
Near the camshaft

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Sportscar Which of these parts do sports cars and heavy-duty trucks often have in common?
Fuel regulators
Torque restrictors
Transmission boosters
Oil coolers
When an engine is going to have extra strain on it — be it pulling or carrying heavy loads or being required to go really fast — oil coolers help take some of the pressure off the motor and keep it in good working order. There are also transmission coolers designed for the same purpose.

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