Automotive Electrical/Electronics (Auto 170) Practice Exam

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• What is considered normal battery drain (parasitic drain) in vehicles with various electronic circuits?
• What is the purpose of a multimeter in automotive diagnostics?
• How do CAN signals operate when transmitting data?
• During an amperage draw test on a V-6 engine, what is considered a normal starter current draw?
• Another name for a ground is ________.
• What does 'circuit resistance' refer to in automotive systems?
• Starter motors operate on the principle that ________.
• Should all batteries be secured in a bracket that is bolted to the vehicle to prevent damage?
• A fully charged 12-volt battery should indicate what voltage?
• What is the role of the starter motor in relation to the engine flywheel?
• When should a voltage drop test of the charging circuit be performed?
• A starter motor rotates about _________ times faster than the engine.
• A transistor can ________.
• How are capacitors utilized in automotive electronics?
• What does an 'open circuit' indicate in automotive electrical systems?
• The arrow in a symbol for a semiconductor device ________.
• The voltage regulator controls the current through which of the following?
• In automotive electrical systems, what does 'ground' refer to?
• How is coil polarity determined?
• How much current typically flows through the alternator brushes?
• What is the purpose of a fuse in automotive electrical systems?
• What is the primary function of a rectifier in an alternator?
• When diagnosing electrical issues, what does high resistance in a connection typically indicate?
• The "brain" of the computer is the:
• Which technician is correct regarding what should be added to a battery when the electrolyte level is low?
• Which of the following is NOT a function of a vehicle computer?
• Which tool is commonly used to measure voltage in a circuit?
• What role do sensors play in automotive electronic control systems?
• What is the usual function of the ignition control module?
• What terminals do high-speed CAN BUS communicate through with a scan tool?
• What is a short circuit and its implications in a vehicle's electrical system?
• What is the maximum allowable AC current from the alternator to the battery?
• Which technician is correct regarding the control of the alternator output?
• What is the role of wiring diagrams in automotive repair?
• What distinguishes a mechanical ignition system from an electronic ignition system?
• What battery rating is generally used to determine the load to apply when load testing a battery?
• The positive battery plate is what?
• What component can prevent the engine from cranking?
• What makes a battery "low maintenance" or "maintenance free"?
• What is the primary function of an automotive ground strap?
• What does Ohm's law state in relation to automotive electrical circuits?
• What is the primary role of an alternator in a vehicle?
• What component(s) triggers or controls the ignition module?
• The alternator output current is produced in which component?
• Which item is a computer input sensor?
• What is a common result of a weak battery during starting?
• What does a higher specific gravity indicate about a battery?
• What do automotive relays primarily control?
• What is the function of an onboard diagnostic system (OBD)?
• What defines an electrical load in an automotive circuit?
• Which of the following is a common sign of a failing battery?
• Which symptom might indicate a malfunctioning alternator?
• Why are circuit diagrams important in troubleshooting automotive electrical systems?
• What could cause a V-8 engine to not crank fast enough?
• GM Class 2 communication operates between which voltage levels?
• What voltage represents the inactive state for UART?
• What unit is used to measure electric current?
• What does GMLAN refer to in the context of vehicle module communication?
• UART signals toggle at what voltage level?
• If an ohmmeter shows zero ohms between the slip rings and the rotor shaft during an alternator rotor test, what does this indicate?
• The faster a starter motor rotates ____________________.
• What does the ECU (Engine Control Unit) manage in a vehicle?
• What should be inspected if there are low voltage readings at the starter?
• Which component is likely to be connected to a faulty ignition coil?
• What gases are released from a battery when it is being charged?
• In terms of computer components, what does RAM stand for?
• Which of the following is a common type of output signal from a vehicle computer?
• Distributor ignition systems can be triggered by which of the following?
• A charge indicator operates by showing green or red when the battery is charged and dark if the battery is discharged. What does this charge indicator detect?
• In CAN communication, how do CAN H and CAN L behave when not transmitting?
• What is being tested when measuring voltage levels in vehicle module communications?
• When jump starting a vehicle, where should the last connection be made?
• What can cause an electrical component to have an open circuit?
• What is the purpose of a ground fault circuit interrupter (GFCI) in automotive applications?
• What is the primary purpose of a battery management system (BMS)?
• What is the purpose of a fuse box in a vehicle?
• All OBD II vehicles use what type of read-only memory?
• What is true regarding the charging of a maintenance-free (lead calcium) battery?
• An LED can be used in _____________________.
• What causes solenoid clicking according to the technicians?
• What is the primary principle of troubleshooting automotive electrical systems?
• What is the function of the vehicle speed sensor (VSS)?
• What is the primary function of the alternator warning light on a dashboard?
• Which item is a computer output device?
• What does deep cycling mean for a battery?
• How does an alternator differ from a battery in a vehicle?
• What component is primarily responsible for starting a gasoline engine?
• What two things can a vehicle computer actually perform (output)?
• Permanent magnets are commonly used for what part of the starter?
• What compound do the positive and negative plates of a discharged battery primarily convert into?
• What can excessive current through a fuse lead to?
• A transistor is controlled by the polarity and current at ________.
• A zener diode is normally used for voltage regulation. A zener diode, however, can also be used for high-voltage spike protection if connected ________.
• How is a vehicle's electrical system typically powered when the ignition is off?
• What are the four basic computer functions?
• What is a digital voltmeter used for in automotive diagnostics?
• What feature does the vehicle speed sensor provide to the ECU?
• Clamping diodes ________.
• Which safety precaution should be taken when working with automotive electrical systems?
• What does a multimeter measure to help identify issues in electrical circuits?
• What does a capacitor do in an electrical circuit?
• What is the function of a relay in automotive electrical systems?
• What kind of ignition system is typically used in performance engines for better efficiency?
• What does 'parasitic draw' refer to?
• Which statement accurately describes the purpose of module communications networks in vehicles?
• How can a technician effectively check for a short circuit within a wiring harness?
• A magnetic field is created in what part of an alternator?
• What unit of electricity is used as a signal for a computer?
• Series-wound electric motors ________.
• How do active sensors differ from passive sensors in automotive applications?
• What battery rating is tested at 32°F (0°C)?
• Analog signals from sensors are changed to digital signals for processing by the computer through which type of circuit?
• What is another name commonly used for a vehicle module?
• Which technician is correct regarding a no-spark condition caused by faulty components?
• What role does a relay coil play in an automotive relay?
• Operating an alternator in a vehicle with a defective battery can harm which component?
• What does a battery date code sticker indicating D6 mean?
• Which terminal on the data link connector is used for Class 2 communication by General Motors?
• What role does an automotive relay serve?
• How do modern vehicles utilize body control modules (BCM)?
• Which statement is true regarding the solenoid in a starting system?
• Why should the vehicle lights be turned on when checking for ripple voltage from the alternator?
• A semiconductor is a material ________.
• What does a relay do in an automotive electrical system?
• How does the ignition system work in a gasoline engine?
• Which component is NOT part of the primary ignition circuit?
• What setting should a digital multimeter (DMM) be on to check the charging voltage of a battery?
• What should a good diode read when tested with a digital multimeter on the diode check position?
• Which technician is correct regarding the regulation of alternator output voltage?
• Computer speed is measured in:
• What is NOT a cause of slow cranking by the starter?
• What does a high level of resistance in the ignition coil often indicate?
• What is the main difference between AC and DC current in automotive applications?
• What is an acceptable charging circuit voltage range for a 12 volt system?
• What does the starter motor do in an automotive system?
• In what way does a thermistor function within an automotive environment?
• What is CAN bus technology in automotive electronics?
• What is the difference between series and parallel circuits?
• What condition could result in an alternator producing lower-than-normal output but still be functioning correctly?
• Which property of a battery is most affected by temperature changes?
• What is the effect of a faulty ignition switch on starter operation?
• Which technician is correct regarding the function of an overrunning alternator pulley?
• In a series circuit, what happens to the total current if one component fails?
• The brushes are used to transfer electrical power between ______________.
• To check for ripple voltage from the alternator, the digital multimeter (DMM) should be set to measure what type of voltage?
• What is the typical primary resistance of an ignition coil?
• Normal cranking speed of the engine is about ___________.
• How does a charging system maintain battery health?
• Which electrical connector is recommended to be installed when testing for battery drain?
• How does an electronic control module (ECM) differ from an ECU?
• What is the primary function of the pulse generator?
• What is the significance of color coding in automotive wiring?
• During a high-rate discharge test, what should a good 12-volt battery read at the end of a 15-second load test?
• Which of the following safety precautions is critical when working on automotive electrical systems?
• The forward-bias voltage required for an LED is ________.
• The neutral safety switch is located ________________.
• Which component typically helps to determine ignition timing in an engine?
• What does 'current flow' refer to in electrical circuits?
• What is the use of terminal 16 on the OBD-II data link connector?
• Which symptom may indicate a faulty ignition coil?
• A diode installed across a coil with the cathode toward the battery positive is called ________.
• Which electrical component converts electrical energy into mechanical energy?
• What could cause slow cranking and excessive current draw?
• What does a relay do in an automotive electrical circuit?
• What is the main purpose of automotive connectors?
• Alternator brushes are primarily constructed from which material?
• What does an open circuit mean?
• Which battery rating is tested at 0°F (-18°C)?
• Which communication standard operates at 7 and 12 V?
• Which component is considered the main control unit in modern automotive systems?
• What is the maximum allowable difference in specific gravity readings when measuring electrolyte?
• In what situation would you typically use a relay?
• What is the importance of fuses in an automotive electrical system?
• What is the primary function of the CPU in a computer system?
• What does a 'CCA' rating indicate in regard to batteries?
• What does 'load test' refer to when evaluating battery performance?
• Technician A says that a defective solenoid can cause a starter whine. Technician B says that a defective starter drive can cause a starter whining noise. Which technician is correct?
• What type of sensor often provides input for ignition timing and cylinder position?
• Which technician is correct about the maximum output of wye-wound and delta-wound stators?
• Which technician is correct about the requirements for diodes in relation to stator winding?
• In a maintenance-free battery, how is the electrolyte designed?
• A growler is used to test which starter component?
• What type of communication does GMLAN use?
• What does a broken fuse indicate in an electrical system?
• What is one potential cause of starter motor failure?
• What is a high-resistance connection and why is it a problem?
• When a battery becomes completely discharged, both positive and negative plates become what, and the electrolyte becomes what?
• When should bench testing of a starter be performed?
• The SAE term for the vehicle computer is:
• What happens if the clearance between the starter pinion and the engine flywheel is too great?
• What unit contains a hold-in winding and a pull-in winding?
• What does a digital voltmeter reading of 878 mV during cranking indicate?
• Which terminal serves as the signal ground for all vehicles in the OBD-II data link connector?
• Which of the following is NOT a function of the ECU?
• A compression-sensing ignition system uses which type of ignition?
• What is the function of a battery in an automotive electrical system?
• A battery's reserve capacity indicates what?
• Which component is primarily responsible for storing electrical energy in a vehicle?
• What is the primary purpose of spark plug wires in an ignition system?
• How does an ohmmeter function in automotive diagnostics?
• A waste-spark-type ignition system fires how many spark plugs at the same time?
• Why is it important to understand the polarity of electrical connections in automotive applications?
• Which battery rating is expressed in minutes?
• What is the role of diodes in automotive electronics?