NOCTI Automotive Practice Test

These questions are part of the practice quiz. Start practicing

• Why must OBD-II readiness monitors be complete before an emissions test?
• How does a MAF sensor work in air intake measurement?
• In a diagonally split braking system, which sequence is correct for bleeding when replacing the left front caliper?
• When a smaller gear drives a larger gear, the result is that the speed
• When installing a new transmission rear seal, what should the inner lip be lubricated with?
• When disabling the airbag(SRS) on a vehicle for service, the technician should
• As part of a pre-alignment inspection, the technician should first check
• Automotive horns get power from a/an ________.
• What is the function of the brake master cylinder in a vehicle's braking system?
• What is the typical purpose of a fuel injector's spray pattern?
• How can you verify a fuel pressure regulator is maintaining proper fuel pressure?
• An indication of alternator output can be obtained by
• What does P0171/P0174 indicate in OBD-II codes?
• In automotive axles, what does the term Constant-Velocity stand for?
• What is the purpose of a properly formed spray pattern from a fuel injector?
• Describe a typical step-by-step approach to diagnosing a no-start condition.
• Oxygen sensor effect on fuel trim
• A battery load test is performed by
• A cooling system bleeder screw is used to
• What is the primary purpose of wearing PPE and following lockout/tagout procedures in an automotive shop?
• A gas engine emits blue smoke for a few seconds after starting cold, the most likely cause is
• In a hydraulic braking system, what is the primary function of brake fluid?
• A high, hard brake pedal and excessive stopping distance could indicate
• During a fuel pressure test, what should be observed when the engine is shut off?
• In a typical OBD-II system, what does P0300 indicate?
• All-wheel-drive vehicles split power to the front and rear axles using a Center differential. Which option correctly identifies its function?
• Which unit measures the rate of current flow in an electrical circuit?
• What is the function of the EGR valve?
• The number 10.090 cast into the brake drum refers to which specification?
• In a diagonally split braking system, which wheel should be bled first when replacing the left front caliper?
• Coolant in the engine oil would most likely indicate a
• Which statement best describes timing belt service on interference engines?
• During timing belt replacement on a dual overhead engine, which action helps prevent timing errors?
• Which of the following circuits has two or more paths for the current to follow?
• When servicing a rear differential with limited slip, the technician should
• When servicing the fluid on a manual trans/transaxle, what should you do?
• Which of the following best describes the role of the electronic controller in brake systems?
• A 50-50 mix of antifreeze and water in the cooling system raises the boiling point.
• Using a spark test tool to diagnose misfiring cylinders, what indicates a misfiring cylinder?
• Which statement describes the universal joint's main function?
• What are common signs of an overheating engine?
• Which statement best defines torque and its importance for fasteners?
• On a front engine, front wheel drive vehicle, the outer axle joints are usually what type?
• The most common cause of driveline vibration is?
• The evaporative emissions (EVAP) system purges captured fuel vapors into the engine at what time?
• High resistance in the starter circuit can be checked with a/an ________ test.
• Which of the following describes P0300 in OBD-II?
• The fluid in an automatic transmission is brown and has a burnt odor, this would indicate
• What is the main function of the universal joint in the drivetrain?
• The gear sets used in most automatic transmissions are referred to as
• Which device is commonly used to regulate the field current in an automotive alternator?
• One very dim headlight is most likely the result of which condition?
• While load testing a 12-volt battery, the voltage reading should not test below ______.
• For a transfer case with leakage due to seals and gaskets, which checks are essential?
• When testing a good diode in both directions with an ohmmeter, the readings should be
• What does the MAF sensor provide to the engine computer?
• What is the function of a fuse in an automotive circuit?
• For charging a battery, which temperature is recommended?
• In a circuit, a path that allows current to bypass the load is called a
• Seal materials used for high temperature applications are usually made from
• What does the pinion seal primarily seal in a differential?
• Which device is used to measure electrical resistance in a circuit?
• What is the function of the power steering system in a vehicle?
• Timing belt service are critical on interference engines because
• Which area should be checked for hydraulic clutch leaks?
• In a parallelogram steering linkage, which component does the pitman arm support?
• If three lamps of 2 ohms, 6 ohms, and 10 ohms are connected in series, their total resistance value is
• In an electrical circuit, which action completes the circuit when the dome light should come on?
• Which component primarily enables angular flexibility between drive shaft sections?
• The device used to control alternator field current is the ________.
• How does a smoke test compare to a vacuum test when locating leaks?
• Which statement is most accurate about preparing for a charging system test?
• If a rear differential lacks a drain plug, which tool may be required to service the fluid?
• After clutch assembly replacement, release problems can be improved if the master cylinder has what feature?
• When does the pressure plate assembly rotate in a hydraulic clutch system?
• The MOST common wire identification on wiring diagrams is _______ coding.
• Which tool is used to apply a precise torque to fasteners during assembly?
• The cover gasket on a differential serves to seal the differential cover to the housing. Which problem would most likely result from a failed cover gasket?
• In automatic transmission fluid, which condition would indicate worn friction materials?
• A CVT commonly used in hybrid vehicles achieves its variable drive ratio primarily through
• When does the drive shaft and yokes need to be marked before disassembly?
• The front tire caster angle is the forward or backward tilt of which component?
• What is the purpose of performing a compression test during no-start diagnostics?
• A typical front-engine, rear-wheel-drive car has how many universal joints and what other driveline feature?
• What are the main components of a basic automotive HVAC system?
• During a battery load test, the standard duration for applying the load is
• What is the role of the battery in automotive electrical systems?
• A 12 gauge wire will safely carry more _____ than a 16 gauge wire
• In an automotive shop, which extinguisher type is appropriate for flammable liquids and electrical fires, and where should you aim?
• When replacing a cylinder head gasket, which type of head bolts should always be replaced
• How do micrometers and vernier calipers differ in measurement?
• All-wheel-drive vehicles split power to the front and rear axles using a
• Which statement best describes the function of the cooling system thermostat?
• How does a manual transmission engage gears?
• Current is measured in ______.
• The star wheel on a drum brake is used when removing the brake drum.
• What component is the brain of the anti-lock brake system (ABS)
• When servicing a drum brake assembly, ______ side(s) should be taken apart at a time.
• When assessing a transfer case for potential leakage, which combination of checks is essential?
• Which HVAC component rejects heat from refrigerant to outside air?
• What is the output driving ratio of a continuously variable transmission?
• Engine coolant replacement intervals are typically determined by which factors?
• During traction control system DTC checks, the technician should
• What is the purpose of a torque converter in an automatic transmission?
• What is the purpose of performing a vacuum test on the brake system?
• How do you check for proper charging system operation?
• When charging a battery
• A punctured radial tire should only be repaired in which area?
• To align the steering gear sector shaft end splines, the splines engage which component?
• A remote keyless entry (RKE) fob is an electronic
• The _______ protects the windshield wiper electrical system
• Why is a torque specification used when installing cylinder head bolts?
• Overhead cam engine timing chains may use mechanical, spring, or ___________ tensioners
• Ignition coil role
• When checking the automatic transmission fluid, most transmissions should be
• Which gear arrangement is foundational to most automatic transmissions and provides multiple gear ratios through engagement of sun gear, planet gears, and ring gear?
• In a CVT, which components are used to change the drive ratio?
• When using a brake lathe, the technician should use
• Terminal voltage for a fully charged battery is ________ volts.
• When using a fire extinguisher on an automotive fire, where should you aim?
• Which component is an example of a sensor in automotive systems?
• Which wheel alignment angle primarily influences steering stability?
• Clutch pedal free travel is the distance the clutch pedal travels before what occurs?
• Why should insulated test leads be used with a digital multimeter in automotive testing?
• Which HVAC component reduces refrigerant pressure and temperature?
• Which tool is used to measure lateral runout on a brake rotor?
• What is the recommended first safety step when beginning work to remove or replace a transmission/transaxle?
• To remove the brake drum, turn the star wheel with a
• Which symptom indicates a worn U-Joint?
• Alternator Diodes are used to convert
• Which action is typical for ensuring safe operation of windshield wiper electrical systems?
• Which component connects the driveshaft to the rear differential in a typical front-engine, rear-wheel-drive setup?
• What is a CV joint and its function?
• Which statement best describes camber, toe, and caster in suspension geometry?
• When checking the fluid level on a manual transmission/transaxle the vehicle should be raised in a level position
• If a misfiring cylinder is being tested with a spark tester, a likely cause is?
• Which material is commonly used for high-temperature seal applications in brakes?
• What does an engine oil grade primarily indicate?
• What is boost pressure and its relation to engine performance in turbocharged engines?
• How is the power steering system bled?
• In a non-interference engine, a timing belt failure is unlikely to cause which damage?
• Noise that occurs when the clutch is disengaged is usually due to what component?
• When testing a diode with an ohmmeter, which observation would be considered correct according to standard interpretation?
• A hard brake pedal and longer stopping distance are most likely symptoms of a problem with which component?
• What is the purpose of a fuel pressure test, and what steps are involved?
• A remote keyless entry fob is best described as
• The MAXIMUM allowable voltage drop in an automotive starter ground circuit while cranking the engine is
• Which symptom would indicate a worn U-Joint?
• To replace an open fuse properly, you should use
• Engine coolant replacement intervals vary primarily based on which factors?
• During testing of a fuel pressure regulator, applying vacuum to the regulator's vacuum port should result in...
• Which safety information should be reviewed before starting repairs?
• Which component is used to release air trapped in the cooling system?
• How is Ohm's Law applied in automotive electrical systems?
• What is the correct sequence when disconnecting and reconnecting a vehicle battery during service?
• A bulge in the tread of the tire could indicate what?
• Following the first wheel, which wheel is bled second in the diagonally split system when replacing the left front caliper?
• When operating the starter circuit, the technician hears spinning but the engine does not turn. The cause might be
• During drum brake service, how many sides should be taken apart at a time?
• What is a typical rear axle lubricant specification?
• If a front wheel exhibits both radial and axial movement, what would be the MOST likely cause?
• The end of the steering gear sector shaft, located outside the steering gearbox housing, has splines that align to which component?
• When removing or replacing a transmission/transaxle, what is the first step?
• In a basic automotive HVAC system, which component absorbs heat from the cabin air to produce cooling?
• What role does a thermostat play in the cooling system?
• What is the primary function of ABS (Anti-lock Braking System) in braking performance?
• To check fluid level on a automatic transmission equipped with a fluid level instead of a dipstick, a technician would use a/an
• Excessive tire wear on tread shoulders is probably caused by what condition?
• When checking for parallelism on a disc brake rotor, the technician can use a
• Before handling chemicals in the shop, what safety information is essential to consult?
• In an automobile charging system, which component performs the conversion from AC to DC?
• Excessive wear on the inner edge of a tire indicates which alignment issue?
• For lateral runout, a technician should use a
• Why is the radiator cap important?
• Which component is most likely defective if a brake pedal slowly sinks to the floor with no loss of brake fluid?
• When checking engine compression, what could cause low compression in all cylinders?
• What is the function of a catalytic converter?
• What will occur if a non-interference engine-timing belt breaks when running at 2000 rpm
• Which bolts should be replaced when replacing a cylinder head gasket?
• Why is it important to check for air leaks in a vacuum line during a diagnostic test?
• What happens to the silicone fluid in a viscous clutch when heated?
• When performing wheel alignment, which are the three primary adjustment angles?
• In the P205/75R15 tire size, what does the number 205 indicate?
• On all-wheel-drive equipped vehicles, a popping noise from the front end during turns is usually caused by a/an
• When diagnosing traction control, the ______ system must be working correctly before traction assist can be diagnosed.
• The lug nut torque star pattern is used to ensure what?
• What is the primary purpose of the evaporative emissions (EVAP) system in modern vehicles?
• How does an EGR system reduce NOx emissions?
• In ABS, which component processes sensor input and controls braking events?
• Before testing a charging system, the vehicle must have
• A disc brake rotor's total indicated runout reading should be
• Which alignment condition causes wear on the inner edge of tires?
• In a hydraulic system, applying pressure to confined fluid results in equal transmission in all directions, a principle known as
• The dome lights usually come on when the light switch or door jam switch ________.
• If the parking brake pedal does not return to the fully raised position, the most likely cause is?
• What does a high resistance reading on a dead-open circuit indicate?
• The nose of a vehicle dips toward the road due to weight shift from rear to front. This is known as what?
• A luminous bright colored tint found in the transmission fluid is most likely caused by
• In a parallelogram steering linkage, which component does the Pitman arm support?
• An automobile has a soft, spongy pedal. The technician should check for
• The vehicle's power steering pump may be used to supply power to the Hydro-boost power brakes.
• Which lubrication specification is typical for a rear axle?
• Which practice helps prevent accidental starting of equipment during service?
• What is an OBD-II readiness monitor and why is it important for emissions testing?
• When using a digital multimeter to measure resistance in automotive circuits, which safety practice is essential?
• When pressure is applied to fluid in an enclosed space, the fluid exerts
• When inspecting a rear differential for leaks, which seal should be checked along with the axle seals and cover gasket?
• During vacuum testing, what component's adequacy is assessed to ensure proper braking assist?
• A brake pedal that slowly goes to the floor when the brakes are applied with no fluid loss could indicate the
• When replacing an open (blown) fuse a
• If all four wheels tend to lock-up while driving, the most likely trouble would be in the
• How does engine oil viscosity relate to temperature?
• Which statement describes the effect on speed and torque when a smaller gear drives a larger gear?
• The technician bleeds the power steering system by which action?
• When safely performing a traction control system diagnostic trouble code (DTC) check the technician should
• Given a customer concern of "grinding noise when braking," the technician should perform
• Terminal voltage for a fully charged 12-volt battery is typically in which range?
• In turbocharged engines, what controls boost pressure?
• Which HVAC component is responsible for increasing refrigerant pressure in the system?
• When installing a wheel and tire on a vehicle, lug nuts should be torqued in which pattern?
• Most vacuum assist power brake units have _______ reserve stops.
• Extreme tire wear on the inside edge indicates excessive what?