Mechanic Trivia Questions

From the four strokes of an engine to the word hiding in poppet valve, for a shop or garage crowd.

See all 64 with answers
In a gasoline engine, which part sets the compressed fuel and air alight?

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Unofficial practice questions, not affiliated with any school, exam board or quiz show. Bank checked October 9, 2026.

All 64 questions with answers

Inside the engine 13

  • A supercharger also packs extra air into an engine. How is it usually driven? Answer: By a belt from the crankshaft. Source: Wikipedia: Supercharger
  • Between which two parts of an engine does the head gasket sit? Answer: The cylinder head and the engine block. Source: Wikipedia: Head gasket
  • How is the fuel set alight in a diesel engine? Answer: By the heat of air squeezed in the cylinder. Source: Wikipedia: Diesel engine
  • In a four-stroke engine, how fast does the camshaft turn compared with the crankshaft? Answer: Half as fast. Source: Wikipedia: Camshaft
  • In a four-stroke engine, which stroke comes straight after compression? Answer: The power stroke. Source: Wikipedia: Four-stroke engine
  • In a gasoline engine, which part sets the compressed fuel and air alight? Answer: The spark plug. Source: Wikipedia: Spark plug
  • What does the crankshaft do in a piston engine? Answer: Turns the pistons' up-and-down motion into rotation. Source: Wikipedia: Crankshaft
  • What drives a turbocharger? Answer: The engine's exhaust gases. Source: Wikipedia: Turbocharger
  • What is the job of a timing belt? Answer: To keep the camshaft in step with the crankshaft. Source: Wikipedia: Timing belt (camshaft)
  • What links each piston to the crankshaft? Answer: A connecting rod. Source: Wikipedia: Connecting rod
  • What makes a piston gas-tight inside its cylinder? Answer: Piston rings. Source: Wikipedia: Piston
  • Which device mixed air and fuel in most car engines until fuel injection took over? Answer: The carburetor. Source: Wikipedia: Carburetor
  • Why is a flywheel often bolted to one end of the crankshaft? Answer: To smooth out the delivery of power. Source: Wikipedia: Crankshaft

Gears, brakes and wheels 13

  • A shock absorber soaks up the energy of a bump. Into what does it usually turn that energy? Answer: Heat. Source: Wikipedia: Shock absorber
  • The French pioneer Gabriel Voisin tried an early way of easing brake pressure to stop tires slipping. On which vehicles? Answer: Aircraft. Source: Wikipedia: Anti-lock braking system
  • In a disc brake, what squeezes the pads against the disc? Answer: The calipers. Source: Wikipedia: Disc brake
  • In a drum brake, what presses outward against the inside of the drum? Answer: A set of shoes. Source: Wikipedia: Drum brake
  • In a motor vehicle, which part is the link between the engine and the transmission? Answer: The clutch. Source: Wikipedia: Clutch
  • In which pattern should the lug nuts of a wheel be put on? Answer: A star pattern. Source: Wikipedia: Lug nut
  • What does a differential let the two wheels of a drive axle do in a corner? Answer: Turn at different speeds. Source: Wikipedia: Differential (mechanical device)
  • What does an anti-lock braking system stop the wheels from doing? Answer: Locking up under braking. Source: Wikipedia: Anti-lock braking system
  • Wheel alignment sets three main angles. Camber and caster are two of them. What is the third? Answer: Toe. Source: Wikipedia: Wheel alignment
  • Which joint lets a shaft pass on its turning to a second shaft set at an angle to it? Answer: A universal joint. Source: Wikipedia: Universal joint
  • Which mechanism in most modern manual transmissions eases the change from one gear to the next? Answer: Synchromesh. Source: Wikipedia: Manual transmission
  • Which spring, made of thin arc-shaped plates, is among the oldest kinds of vehicle suspension? Answer: The leaf spring. Source: Wikipedia: Leaf spring
  • Why can brake fluid carry the push of a foot all the way to the wheels? Answer: Liquids can hardly be compressed. Source: Wikipedia: Brake fluid

Sparks, fluids and gauges 13

  • A scanner plugged into a car's OBD port reads its trouble codes. What does OBD stand for? Answer: On-board diagnostics. Source: Wikipedia: On-board diagnostics
  • Antifreeze lowers the freezing point of the coolant. What does it do to the boiling point? Answer: Raises it. Source: Wikipedia: Antifreeze
  • How many cells are joined in series in a 12-volt car battery? Answer: Six. Source: Wikipedia: Automotive battery
  • In older engines, which part sends the high voltage to each spark plug in turn? Answer: The distributor. Source: Wikipedia: Distributor
  • Motor oil cuts friction and wear. Which of these does it also do? Answer: Carries heat away from moving parts. Source: Wikipedia: Motor oil
  • Until the 1960s, what did cars use in place of an alternator? Answer: A DC dynamo. Source: Wikipedia: Alternator (automotive)
  • What does a car's alternator do while the engine is running? Answer: Charges the battery. Source: Wikipedia: Alternator (automotive)
  • What does an ignition coil do? Answer: Raises battery voltage high enough to fire the spark plugs. Source: Wikipedia: Ignition coil
  • Which dashboard gauge shows how fast the engine is turning? Answer: The tachometer. Source: Wikipedia: Tachometer
  • Which part of the cooling system controls how much coolant goes to the radiator? Answer: The thermostat. Source: Wikipedia: Radiator (engine cooling)
  • Which simple tool shows how much oil is in an engine? Answer: A dipstick. Source: Wikipedia: Dipstick
  • Which small oversight at the gas pump can switch on a check engine light? Answer: A loose gas cap. Source: Wikipedia: Check engine light
  • With which three precious metals were the first catalytic converter prototypes coated? Answer: Platinum, rhodium and palladium. Source: Wikipedia: Catalytic converter

Tools of the shop 13

  • A scissor jack lets one person lift a car by hand. Which simple mechanism does its handle turn? Answer: A screw. Source: Wikipedia: Jack (device)
  • Conrad Bahr, who patented an adjustable ratcheting torque wrench in 1935, worked for which city department? Answer: New York City's water department. Source: Wikipedia: Torque wrench
  • From which older tool may pliers have developed? Answer: Tongs for handling hot metal. Source: Wikipedia: Pliers
  • Inside a ratchet, what is the spring-loaded finger that catches the teeth called? Answer: A pawl. Source: Wikipedia: Ratchet (device)
  • The monkey wrench was an American refinement of English wrenches made for which vehicles? Answer: Coaches. Source: Wikipedia: Monkey wrench
  • What does a torque wrench let a mechanic do? Answer: Tighten a bolt to a set value. Source: Wikipedia: Torque wrench
  • What is a mechanic's creeper? Answer: A low wheeled board for sliding under a car. Source: Wikipedia: Creeper (tool)
  • What is a wrench called in the United Kingdom, Ireland, Australia and New Zealand? Answer: A spanner. Source: Wikipedia: Wrench
  • Which three things can a typical multimeter measure? Answer: Voltage, resistance and current. Source: Wikipedia: Multimeter
  • Which tool is a fan of thin steel blades for measuring a small gap? Answer: A feeler gauge. Source: Wikipedia: Feeler gauge
  • Which wrench lets you swing the handle back and forth without lifting it off the nut? Answer: A ratcheting socket wrench. Source: Wikipedia: Socket wrench
  • Why is a lifting jack called a jack? Answer: Jack, a word for a common man, passed to tools that save a man's labor. Source: Wikipedia: Jack (device)
  • The word vise goes back to the Latin vitis. What does vitis mean? Answer: Vine. Source: Wikipedia: Vise

Units and words of the trade 12

  • The "poppet" in poppet valve shares its origin with which word? Answer: Puppet. Source: Wikipedia: Poppet valve
  • At how many foot-pounds of work a minute was one horsepower fixed? Answer: 33,000. Source: Wikipedia: Horsepower
  • Before the 20th century, whom did the word mechanic describe? Answer: Anyone in the handicraft trades. Source: Wikipedia: Mechanic
  • Engine knock has another everyday name, after the metallic sound it makes. What is it? Answer: Pinging. Source: Wikipedia: Engine knocking
  • Tire is short for which longer word? Answer: Attire. Source: Wikipedia: Tire
  • What do British drivers call a muffler? Answer: A silencer. Source: Wikipedia: Muffler
  • What does an engine's compression ratio compare? Answer: The cylinder's largest and smallest volumes. Source: Wikipedia: Compression ratio
  • What does the displacement of an engine measure? Answer: The volume swept by all its pistons. Source: Wikipedia: Engine displacement
  • What does the octane rating of a fuel measure? Answer: How well it resists knocking under compression. Source: Wikipedia: Octane rating
  • What is the SI unit of torque? Answer: The newton-meter. Source: Wikipedia: Torque
  • Which kind of horse was measured in the experiment of 1782 that led to the unit horsepower? Answer: A brewery horse. Source: Wikipedia: Horsepower
  • The word torque comes from a Latin verb. What does the verb mean? Answer: To twist. Source: Wikipedia: Torque

How it works

What drives a turbocharger, and why is a lifting jack called a jack? These mechanic trivia questions are about how a car works and the tools of the shop. No make or model is an answer.

Read the full guide

Car mechanic trivia questions, system by system

Inside the engine follows the four strokes, the camshaft and the turbocharger. Gears, brakes and wheels runs from the clutch to the lug nuts. Sparks, fluids and gauges covers the battery, the coolant and the check engine light.

Basic mechanic knowledge trivia questions and answers

Tools of the shop asks what a feeler gauge, a creeper and a torque wrench are for. Units and words of the trade takes in horsepower, torque, octane and displacement, and where the words tire and mechanic come from.

  • Run Units and words of the trade last: it is the round a shop argues over.

Questions and answers

What are some easy mechanic trivia questions?

Which part sets the fuel alight in a gasoline engine? What do British drivers call a muffler? Which simple tool shows how much oil is in an engine? The answers are the spark plug, a silencer and a dipstick.

What are the four strokes of an engine?

Intake, compression, power and exhaust. The piston draws in fuel and air, squeezes it, is driven down when it burns and pushes out the spent gas. The crankshaft turns twice in one full cycle.

What is the difference between horsepower and torque?

Torque is twisting force, measured in newton-meters or pound-feet. Horsepower is power, how fast work is done. Multiply torque in pound-feet by engine speed in rpm and divide by 5,252 to get horsepower.

How were the answers checked?

Every answer was found on October 9, 2026 in the English Wikipedia article linked beside it. With 57 articles in all, none gives more than two questions. Repair steps, torque figures and service intervals were left out.