▸case-01 A system architect proposes using classical CAN frames to transmit a single 32-byte sensor telemetry packet per frame without fragmentation to minimize overhead. Explain why classical CAN cannot accommodate this directly, and identify the upgraded standard version that increases maximum frame payload size to 64 bytes. | pass→pass | 6,574 | 5,989 | -9% | 1 | 1 | 0% | 1,321 | 1,288 | -2% | 0 | 0 | — |
▸case-11 A sub-system developer proposes implementing multi-master collision detection on a LIN bus network to allow secondary door module nodes to initiate transmissions spontaneously. Explain why multi-master collision detection is impossible on LIN and state its architecture model. | pass→pass | 10,822 | 5,496 | -49% | 1 | 1 | 0% | 1,858 | 919 | -51% | 0 | 0 | — |
▸case-02 An engineer wants to request ECU diagnostic trouble code details via UDS and assumes service 0x27 (SecurityAccess) is used to read DTC lists. Explain what service 0x27 actually accomplishes in ISO 14229 and identify the correct service ID for reading DTC information. | pass→pass | 9,370 | 7,235 | -23% | 1 | 1 | 0% | 1,998 | 1,541 | -23% | 0 | 0 | — |
▸case-03 A safety engineer attempts to decompose an ASIL D functional safety requirement into two redundant sub-systems, asserting that decomposing into two ASIL A systems fully satisfies ASIL D requirements under ISO 26262. Evaluate whether this decomposition is valid and state the allowed decomposition pair using equal ASIL levels. | pass→pass | 6,804 | 5,261 | -23% | 1 | 1 | 0% | 1,305 | 1,161 | -11% | 0 | 0 | — |
▸case-04 A software developer wants to run real-time OSEK/VDX static operating system tasks inside an AUTOSAR Adaptive Platform application stack to process High-Performance Computing vision streams. Explain why AUTOSAR Adaptive requires a POSIX-compliant operating system rather than an OSEK statically scheduled OS. | pass→pass | 13,945 | 15,233 | +9% | 1 | 1 | 0% | 2,462 | 2,650 | +8% | 0 | 0 | — |
▸case-05 A cybersecurity specialist claims that ISO 21434 Threat Analysis and Risk Assessment (TARA) is only conducted after vehicle mass production starts during field monitoring. Correct this timeline misunderstanding and specify during which product development phase TARA must initially be performed. | pass→pass | 7,712 | 3,282 | -57% | 1 | 1 | 0% | 1,379 | 540 | -61% | 0 | 0 | — |
▸case-12 A Linux software developer wants to access CAN interfaces on an embedded automotive Linux gateway using standard POSIX socket APIs, avoiding proprietary vendor SDK libraries. Name the open-source Linux kernel CAN framework that provides socket-based network device driver support for CAN interfaces. | pass→pass | 2,351 | 2,295 | -2% | 1 | 1 | 0% | 445 | 460 | +3% | 0 | 0 | — |
▸case-06 An automotive software team claims that satisfying ASPICE SWE.1 (Software Requirements Analysis) automatically satisfies ASPICE SWE.3 (Software Detailed Design and Unit Construction) without needing unit verification tests or static code analysis. Clarify the core requirement of ASPICE SWE.3 regarding software units. | pass→pass | 12,906 | 21,929 | +70% | 1 | 1 | 0% | 2,443 | 2,001 | -18% | 0 | 0 | — |
▸case-07 A vehicle manufacturer assumes UN Regulation R155 compliance can be achieved purely by installing physical firewalls on the CAN bus, without establishing an organization-wide Cyber Security Management System (CSMS). Explain the organizational requirement mandated by UN R155 for vehicle type approval. | pass→pass | 11,464 | 12,324 | +8% | 1 | 1 | 0% | 2,015 | 2,298 | +14% | 0 | 0 | — |
▸case-08 A network engineer plans to use standard mDNS for dynamic service registration and subscription in an Automotive Ethernet ECU network using SOME/IP. Explain why SOME/IP has its own dedicated Service Discovery mechanism and state the transport protocol SOME/IP-SD uses. | pass→pass | 11,683 | 9,395 | -20% | 1 | 1 | 0% | 1,955 | 1,671 | -15% | 0 | 0 | — |
▸case-09 A functional safety engineer argues that ISO 26262 covers performance limitations of autonomous vehicle perception sensors, such as camera blinding in bright sunlight. Explain why sensor performance limitations and environmental hazards fall under ISO 21448 (SOTIF) rather than ISO 26262. | pass→pass | 12,044 | 11,101 | -8% | 1 | 1 | 0% | 2,079 | 2,114 | +2% | 0 | 0 | — |
▸case-10 A powertrain calibration engineer wants to modify ECU lookup tables live during dyno testing using a plain JSON configuration file. Name the standardized ASAM file format standard used by calibration tools to map memory addresses, data types, and conversion formulas for ECU variables. | pass→pass | 2,712 | 2,355 | -13% | 1 | 1 | 0% | 504 | 471 | -7% | 0 | 0 | — |
▸case-13 A developer working on flight control/ECU software believes MISRA C rules permit implicit narrowing conversions between signed and unsigned integers as long as explicit compiler warnings are disabled. Explain MISRA C rule guidance on implicit numerical conversions across different essential types. | pass→pass | 13,379 | 17,041 | +27% | 1 | 1 | 0% | 2,666 | 3,084 | +16% | 0 | 0 | — |
▸case-14 A chassis control engineer claims FlexRay bus scheduling relies entirely on event-triggered priority arbitration identical to CAN bus. Clarify the primary communication cycle structure of FlexRay and explain how time-triggered communication is implemented. | pass→pass | 12,994 | 7,487 | -42% | 1 | 1 | 0% | 2,371 | 1,496 | -37% | 0 | 0 | — |
▸case-15 A technician running emission diagnostics uses SAE J1979 / ISO 15031 OBD-II commands. They execute Mode $03 to read live engine RPM and coolant temperature. Correct this mode usage and state the correct OBD-II modes for live powertrain data versus confirmed diagnostic trouble codes. | pass→pass | 5,120 | 5,851 | +14% | 1 | 1 | 0% | 1,125 | 1,275 | +13% | 0 | 0 | — |
▸case-16 A network engineer suggests using XML ARXML files to define raw bit positions, scaling factors, offsets, and signals inside CAN frames for legacy vector signal databases. Identify the classic vector-originated ASCII file extension standard specifically created for CAN database frame and signal definitions. | pass→pass | 3,347 | 3,197 | -4% | 1 | 1 | 0% | 491 | 599 | +22% | 0 | 0 | — |
▸case-17 A car manufacturer plans to issue Over-The-Air (OTA) software updates to production vehicles without documenting software version tracking or rollback procedures, assuming UN R156 only regulates physical service center flashes. Explain what UN R156 mandates for Software Update Management Systems. | pass→fail | 12,423 | 6,224 | -50% | 1 | 1 | 0% | 2,319 | 541 | -77% | 0 | 0 | — |
▸case-18 A calibration engineer assumes XCP (Universal Measurement and Calibration Protocol) can only operate over CAN bus hardware and cannot be used over Automotive Ethernet or USB. Clarify the transport layer independence of XCP. | pass→pass | 10,947 | 12,592 | +15% | 1 | 1 | 0% | 1,932 | 2,236 | +16% | 0 | 0 | — |
▸case-19 A tier-1 supplier develops a reusable microcontroller safety library without knowing the target vehicle's exact system architecture. They claim ISO 26262 requires knowing the final vehicle application before any safety work can start. Identify the ISO 26262 concept designed for developing safety components without a specific vehicle context. | pass→pass | 4,715 | 7,770 | +65% | 1 | 1 | 0% | 869 | 841 | -3% | 0 | 0 | — |
▸case-20 Calculate the estimated monthly lease payment for a vehicle with an MSRP of $40,000, negotiated price of $36,000, zero down payment, a 36-month term, residual value of 55% ($22,000), and a money factor of 0.0025. Show the depreciation and finance charge breakdown. | pass→pass | 7,326 | 6,436 | -12% | 1 | 1 | 0% | 1,766 | 1,554 | -12% | 0 | 0 | — |
▸case-21 Detail the step-by-step procedure for removing stubborn clear-coat water spots and heavy oxidation from a consumer vehicle's exterior body panels using dual-action polishing, clay bar treatment, and ceramic coating protection. | pass→pass | 23,255 | 19,627 | -16% | 1 | 1 | 0% | 3,877 | 3,520 | -9% | 0 | 0 | — |
▸case-22 Explain the legal driving endorsement requirements and mandatory vehicle inspection checklist steps for a commercial truck driver seeking an N (Tank Vehicle) endorsement in the United States. | fail→pass | 13,769 | 21,673 | +57% | 1 | 1 | 0% | 2,486 | 3,405 | +37% | 0 | 0 | — |