What is the main function of a vehicle's radiator?
Cooling System A To cool engine coolant B To lubricate the crankshaft C To charge the battery D To control wheel alignment
The radiator transfers heat from engine coolant to the surrounding air.
In a four-stroke gasoline engine, combustion takes place primarily in the
Engine A oil pan. B cylinder. C radiator. D differential.
The air-fuel mixture burns inside the engine cylinder above the piston.
What is the main purpose of a spark plug in a gasoline engine?
Ignition A To ignite the air-fuel mixture B To pump engine oil C To cool the transmission D To measure tire pressure
A spark plug creates the electric spark that ignites the compressed air-fuel mixture.
What is a primary purpose of engine oil?
Lubrication A To increase tire traction B To reduce friction between moving engine parts C To cool the passenger cabin D To create battery voltage
Engine oil reduces friction and wear between moving parts.
What is the main job of a shock absorber?
Suspension A To increase engine compression B To control excessive suspension movement C To charge the battery D To apply hydraulic brake pressure
Shock absorbers damp repeated spring and suspension movement.
In a typical hydraulic brake system, pressing the brake pedal causes
Brakes A brake fluid pressure to act on the wheel brakes. B engine oil to enter the calipers. C the alternator to stop turning. D the radiator fan to reverse.
The master cylinder creates hydraulic pressure in brake fluid, which operates the wheel brakes.
In a disc brake system, the caliper presses the brake pads against the
Disc Brakes A flywheel. B rotor. C axle housing. D radiator core.
The caliper squeezes brake pads against the rotor to create friction.
What is a major function of the vehicle battery when starting the engine?
Battery A Supply electrical energy to the starter motor B Cool the cylinders C Lubricate the transmission D Reduce exhaust noise
The battery supplies the high electrical current needed by the starter motor.
Once the engine is running, which component normally supplies electrical power and recharges the battery?
Charging System A Alternator B Muffler C Water pump D Fuel injector
The alternator converts mechanical energy into electrical energy and recharges the battery.
What does the starter motor do?
Starting System A Cranks the engine so it can begin running B Circulates coolant through the radiator C Regulates tire pressure D Changes transmission gear ratios
The starter motor turns the engine crankshaft during starting.
What is the purpose of a fuel injector?
Fuel System A Meter and deliver fuel to the engine B Measure engine oil pressure C Open the exhaust valve mechanically D Support the vehicle's suspension
A fuel injector precisely meters and sprays fuel for engine operation.
What is a basic purpose of a transmission?
Transmission A Provide different gear ratios between the engine and drive wheels B Remove heat from engine coolant C Store electrical energy D Filter exhaust gases
A transmission changes gear ratios to match engine speed and torque to driving conditions.
Why is a differential used in a driven axle?
Differential A To allow the drive wheels to rotate at different speeds while turning B To increase coolant pressure C To ignite the fuel mixture D To prevent the battery from charging
During a turn, the outside wheel travels farther, so the differential allows the wheel speeds to differ.
Which engine part converts the piston's up-and-down motion into rotary motion?
Engine Parts A Crankshaft B Radiator C Brake rotor D Shock absorber
Connecting rods transfer piston motion to the crankshaft, which rotates.
What is the camshaft primarily responsible for?
Valve Train A Controlling the opening and closing of engine valves B Charging the battery C Applying the brakes D Cooling the transmission
Camshaft lobes operate the valve train so the valves open and close at the proper times.
What is the main purpose of a muffler?
Exhaust A Reduce exhaust noise B Increase engine oil pressure C Charge the battery D Control brake fluid pressure
A muffler reduces sound produced by exhaust gases leaving the engine.
What is the main purpose of a catalytic converter?
Emissions A Reduce certain harmful exhaust emissions B Increase tire pressure C Cool engine oil D Engage the starter motor
A catalytic converter uses chemical reactions to reduce pollutants in the exhaust stream.
Why is adequate tire tread depth important?
Tires A It helps maintain traction, especially on wet roads B It increases battery voltage C It raises engine compression D It cools the radiator
Tread helps maintain road contact and channel water away from the tire's contact area.
If a vehicle repeatedly pulls to one side on a level road, one possible cause is
Steering A incorrect wheel alignment. B a fully charged battery. C a clean air filter. D a new muffler.
Incorrect wheel alignment can cause a vehicle to pull to one side.
What is the function of the engine thermostat in the cooling system?
Cooling System A Regulate coolant flow based on engine temperature B Measure brake fluid level C Control ignition timing directly D Engage the transmission clutch
The thermostat regulates coolant flow to help the engine reach and maintain normal operating temperature.