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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 __________?

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2). ______ protocol allows MC and other devices to communicate with each other?

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3).______ represents the information transmitted on all nodes?

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4). The ___ allows the computer to communicate over the network through USB.

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5). The controller area network is a _______ protocol?

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6). As the message carries the identifier, _______ is decided?

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7). Data link layer is divided into ____ sub-layers?

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8). MAC stands for ____?

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9). LLC stands for ____?

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10). Node-to-node data transfer takes place in the ____ layer?

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11). Data link layer is used to detect and correct errors occurring at the ____ layer?

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12) _____ is responsible for the transmission of raw data?

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13). LLC is responsible for frame acceptance _____?

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14). Physical layer provides specifications for parameters like ____?

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15). ISO-11898 part 1 has the specification of a data link and physical ____ link layers?

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16). ISO-11898 part 2 comes under CAN physical layer for ____ speed CAN?

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17). ISO-11898 part 3 comes under CAN physical layer for ____ speed CAN?

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18). High-speed CAN allow data rate up to ___ which is used in vehicles.

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19). Low speed CAN allow data rate up to ___ which is used in vehicles.

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20). SOF stands for ______?

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CAN Protocol MCQs for Interviews 

21). Message identifier sets the priority of the data ____?

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22). RTR Stands for ____?

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23). At logic 0, CAN high be applied at ____?

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24). At logic 0, CAN low should be applied at _____?

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25).At logic 1, CAN low should be applied at _____?

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26). For the standard frame, the message identifier is ____ bit?

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27). For extended frames, the message identifier is ____ bit?

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28). How many nodes exist in the CAN protocol?

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29). How many frames exist in the CAN bus?

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30)._____ field is used to detect errors?

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Read more about Hamming Code
31). ______ specifies how many bytes the data field contains?

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32). Differentiation of a small frame from a data frame is done by this bit of ____?

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33). ____bit indicates the beginning of a message with a dominant (logic 0) bit?

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34). Use of wiring due to its distributed control in CAN is ___?

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35). Requires high ____ for software development and maintenance?

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36). a Limited number of nodes used are up to ____ nodes?

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37). CAN has a high ____ data rate?

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38). Supports auto _____ for attribution lost messages/

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39). There exists a possibility of signal ____ issues.

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40). _____ converts data from the CAN controller to CAN bus levels.

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CAN Protocol MCQs for Exams

41). CAN protocol uses two layers of ____ systems interconnection model?

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42). CAN protocol is designed for robust and _____ performance in harsh environments?

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43). A message is ____ if the EOF field is recessive?

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44). _____ is transmitted when the error is detected?

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45). Overload frame is transmitted when the nodes become too __?

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46). Traffic congestion is ____ as messages are transmitted based on priority.

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47). Differential signalling _____ the noise coupling?

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48). ____ contains the time required by the controller to move a received frame to its position?

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49). ___ bit substitutes the RTR bit as a placeholder?

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50). Logic LOW in CAN network is termed as ______?

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CAN Protocol MCQs for Quiz

51). HIGH logic in CAN is termed as _____?

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52). CAN follow a ______ communication?

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53). CAN protocol is developed by ____?

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Read more about UART
54). CAN follow a ____ topology?

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55). Arduino has no ____ CAN protocol/port?

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Read more about Arduino
56). The output of the receive buffer is passed to _____ as input?

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57). PMA performs an ____ synchronization?

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58). Data transmitted in the form of packets is called ____?

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59)._____ performs encoding and decoding of information?

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60). CAN protocol employs the approach of ____ with message priority?

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61). Physical layer outlines the properties for the parameters like ____ rate levels?

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62). Two-wire pairs have a characteristic impedance of ____ ohms?

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63). ISO 11898-3 also called _____ CAN?

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64). Dividing each bit into several time slices called _____?

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65). The number of quanta the bit is divided into can vary by _____?

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66). ______ is a frame to inject a delay between data or a remote frame?

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67). ______ is a frame containing node data for transmission?

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68). _______ is a frame requesting the transmission of a specific identifier?

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69). Expand TEC full form ______?

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70). Expand REC full form ______?

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71). When TEC or REC is greater than 127 and less than 255, a ___ Error frame will be transmitted on the bus?

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72). When TEC and REC are less than 128, an ____ Error frame will be transmitted on the bus?

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73). When TEC is greater than 255, then the node enters into Bus ___ state, where no frames will be transmitted.

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74). The CAN bus is also used as a _____ in general automation environments?

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75). The speed of transition depends primarily on the length of the CAN network and the ____of the wire used.

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