CAN Protocol Question & Answers July 15, 2022 By WatElectronics This article lists 75 CAN Protocol MCQs for engineering students. All the CAN Protocol Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of CAN Protocol. CAN Stands for Control Area Network. It's a two-wired communication protocol. CAN layered architecture consist of two layers Data link layer and the physical layer? The data link layer is divided into two types: MAC- a Media Access Control and LLC- a Logical link control. CAN Standard ISO 11898 has three parts: ISO 11898-1, ISO 11898-2, and ISO 11898-3. CAN framing consists of SOF-Start of Frame, Identifier, RTR which represents Remote transmission request which is of 1-bit. Control field with user-defined functions: IDE, DLC, Data field. CRC-Cyclic redundancy checksum, ACK Field-Receiver’s acknowledgment, and EOF-end of the frame. CAN Network consists of multiple nodes named Node A, B, and C. Each node consists of three elements as Host, Controller, and Transceiver. In CAN, logic 1 is a recessive state, Logic 0 is the dominant state. CAN bus logic- Wired AND Dominant and Recessive. CAN have 4 types of frames: Data, Remote, Overload, and Error. Two message formats exist for data transmission which are Base frame format and extended frame format. 1). CAN stands for __________? Controller Area Network Controller Air Network Couple Area network None of these None Hint 2). ______ protocol allows MC and other devices to communicate with each other? USB USART CAN None of these None Hint 3).______ represents the information transmitted on all nodes? Movement Network Broadcast None of these None Hint 4). The ___ allows the computer to communicate over the network through USB. Switch Node Mode Type None Hint 5). The controller area network is a _______ protocol? Message-Based Voice-Based Numbers Based Code Based None Hint 6). As the message carries the identifier, _______ is decided? Parity Stop Bit Priority Constant None Hint 7). Data link layer is divided into ____ sub-layers? One Two Three None of these None Hint 8). MAC stands for ____? Medium Access Control Media Access control Medium Area control None of these None Hint 9). LLC stands for ____? Logical link control Logical line control Line link control Line light control None Hint 10). Node-to-node data transfer takes place in the ____ layer? Transport Link Data Link Application Link Physical None Hint 11). Data link layer is used to detect and correct errors occurring at the ____ layer? Transport Link Data Link Application Link Physical None Hint 12) _____ is responsible for the transmission of raw data? Transport Link Data Link Application Link Physical Layer None Hint 13). LLC is responsible for frame acceptance _____? Link Mode Method Filtering None Hint 14). Physical layer provides specifications for parameters like ____? Voltage Current Timing None of these None Hint 15). ISO-11898 part 1 has the specification of a data link and physical ____ link layers? Transfer Signal Mode None of these None Hint 16). ISO-11898 part 2 comes under CAN physical layer for ____ speed CAN? Low Least Complex High None Hint 17). ISO-11898 part 3 comes under CAN physical layer for ____ speed CAN? Low Least Complex High None Hint 18). High-speed CAN allow data rate up to ___ which is used in vehicles. 1Mbps 2Kbps 20bps None of these None Hint 19). Low speed CAN allow data rate up to ___ which is used in vehicles. 1Mbps 2kbps 125kbps None of these None Hint 20). SOF stands for ______? Sign off Start of frame Start off None of these None Hint CAN Protocol MCQs for Interviews 21). Message identifier sets the priority of the data ____? Frame Bind Visual Transfer None Hint 22). RTR Stands for ____? Remote transmission request Remote transfer route Routine transfer request None of these None Hint 23). At logic 0, CAN high be applied at ____? 1.5V 2.5V 3.5V 4V None Hint 24). At logic 0, CAN low should be applied at _____? 1.5V 2.5V 3.5V 4V None Hint 25).At logic 1, CAN low should be applied at _____? 1.5V 2.5V 3.5V 4V None Hint 26). For the standard frame, the message identifier is ____ bit? 10 11 12 13 None Hint 27). For extended frames, the message identifier is ____ bit? 27 28 29 30 None Hint 28). How many nodes exist in the CAN protocol? 2 3 4 1 None Hint 29). How many frames exist in the CAN bus? 2 3 4 5 None Hint 30)._____ field is used to detect errors? Data Frame Crc Remote None of these None Hint Read more about Hamming Code 31). ______ specifies how many bytes the data field contains? DLC CRC RTR ACK None Hint 32). Differentiation of a small frame from a data frame is done by this bit of ____? DLC CRC RTR ACK None Hint 33). ____bit indicates the beginning of a message with a dominant (logic 0) bit? SoF EoF ACK CRC None Hint 34). Use of wiring due to its distributed control in CAN is ___? High Low Complex Simple None Hint 35). Requires high ____ for software development and maintenance? Cost Range Temperature Visual None Hint 36). a Limited number of nodes used are up to ____ nodes? 16 32 64 8 None Hint 37). CAN has a high ____ data rate? Velocity Speed Distance Mode None Hint 38). Supports auto _____ for attribution lost messages/ Generation Retransmission Linking None of these None Hint 39). There exists a possibility of signal ____ issues. Damage Loss Integrity None of these None Hint 40). _____ converts data from the CAN controller to CAN bus levels. Transmitter Receiver Transceiver None of these None Hint CAN Protocol MCQs for Exams 41). CAN protocol uses two layers of ____ systems interconnection model? Open Close Swing Move None Hint 42). CAN protocol is designed for robust and _____ performance in harsh environments? Stable Constant Flexible Good None Hint 43). A message is ____ if the EOF field is recessive? Invalid Valid False Error None Hint 44). _____ is transmitted when the error is detected? Display Frame Error Frame Data Frame Remote Frame None Hint 45). Overload frame is transmitted when the nodes become too __? Easy Low High Busy None Hint 46). Traffic congestion is ____ as messages are transmitted based on priority. Entered Eliminated Inserted None of these None Hint 47). Differential signalling _____ the noise coupling? Increases Increments Raise Reduces None Hint 48). ____ contains the time required by the controller to move a received frame to its position? IFS CRC RRT DLC None Hint 49). ___ bit substitutes the RTR bit as a placeholder? SRR IDE DLC RTR None Hint 50). Logic LOW in CAN network is termed as ______? Dominant Recessive 0 1 None Hint CAN Protocol MCQs for Quiz 51). HIGH logic in CAN is termed as _____? Dominant Recessive 0 1 None Hint 52). CAN follow a ______ communication? Synchronous Asynchronous Duplex Full-duplex None Hint 53). CAN protocol is developed by ____? Philips Bosch AT & T Reliance None Hint Read more about UART 54). CAN follow a ____ topology? Bus Star Line Square None Hint 55). Arduino has no ____ CAN protocol/port? Inbuilt Outside Range Switched None Hint Read more about Arduino 56). The output of the receive buffer is passed to _____ as input? Host Controller Interface User interface Bus interface None of these None Hint 57). PMA performs an ____ synchronization? Dual Tri Octet Hepta None Hint 58). Data transmitted in the form of packets is called ____? Work Frames Moves Recover None Hint 59)._____ performs encoding and decoding of information? Physical subset layer Physical Coding sublayer Physical Link sublayer None of these None Hint 60). CAN protocol employs the approach of ____ with message priority? FDMA TDMA WDMA CDMA None Hint 61). Physical layer outlines the properties for the parameters like ____ rate levels? Voltage Current Information Signal None Hint 62). Two-wire pairs have a characteristic impedance of ____ ohms? 100 80 120 200 None Hint 63). ISO 11898-3 also called _____ CAN? High-speed Low Fault-Tolerant None of these None Hint 64). Dividing each bit into several time slices called _____? Quanta Light Movement Group None Hint 65). The number of quanta the bit is divided into can vary by _____? Movement Group Quanta Controller None Hint 66). ______ is a frame to inject a delay between data or a remote frame? Overload Error Delay Data None Hint 67). ______ is a frame containing node data for transmission? Overload Error Delay Data None Hint 68). _______ is a frame requesting the transmission of a specific identifier? Overload Error Remote Data None Hint 69). Expand TEC full form ______? Transmit error counter Transmit error cite Transmit Enlight Code None of these None Hint 70). Expand REC full form ______? Receive error counter Receive error cite Receive enlight code None of these None Hint 71). When TEC or REC is greater than 127 and less than 255, a ___ Error frame will be transmitted on the bus? Passive Active Hybrid Remote None Hint 72). When TEC and REC are less than 128, an ____ Error frame will be transmitted on the bus? Passive Active Hybrid Remote None Hint 73). When TEC is greater than 255, then the node enters into Bus ___ state, where no frames will be transmitted. High Low On Off None Hint 74). The CAN bus is also used as a _____ in general automation environments? Field Bus Alternative Bus Direct None of these None Hint 75). The speed of transition depends primarily on the length of the CAN network and the ____of the wire used. Inductance Capacitance Resistance None of these None Hint Please fill in the comment box below. Time's up
