Industrial Communication Protocols (Modbus, Profibus, etc.) — MCQs – EE

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1. The main purpose of industrial communication protocols is to:
(A) Enable data exchange between devices in automation systems
(B) Reduce power consumption
(C) Control mechanical motion directly
(D) Increase signal frequency

2. The Modbus protocol was originally developed by:
(A) Schneider Electric (Modicon)
(B) Siemens
(C) Rockwell Automation
(D) ABB

3. Modbus is most commonly used for communication between:
(A) PLCs and field devices
(B) Computers and printers
(C) Sensors and actuators only
(D) Robots and vision systems

4. The Modbus protocol primarily operates on:
(A) Master-slave communication architecture
(B) Peer-to-peer communication
(C) Client-server architecture only
(D) Token-passing mechanism

5. Modbus RTU communication is based on:
(A) Serial communication (RS-485/RS-232)
(B) Ethernet
(C) Wireless radio signals
(D) Optical fiber

6. The Modbus TCP/IP protocol operates over:
(A) Ethernet networks
(B) Serial bus systems
(C) Optical lines
(D) Bluetooth connections

7. In Modbus communication, the master device:
(A) Initiates all communication with slaves
(B) Responds to slave requests
(C) Stores backup data
(D) Controls motor speed

8. The slave device in Modbus communication:
(A) Responds to master queries
(B) Controls other slaves
(C) Initiates commands
(D) Changes network configuration

9. Profibus stands for:
(A) Process Field Bus
(B) Programmable Field Bus
(C) Processor Bus
(D) Professional Bus System

10. Profibus was developed by:
(A) Siemens
(B) ABB
(C) Schneider Electric
(D) Rockwell Automation

11. The two main versions of Profibus are:
(A) Profibus DP and Profibus PA
(B) Profibus RTU and Profibus TCP
(C) Profibus RS and Profibus IP
(D) Profibus Lite and Profibus Pro

12. Profibus DP is typically used for:
(A) Fast data exchange between PLCs and field devices
(B) Long-distance telemetry
(C) Process instrumentation in hazardous areas
(D) Wireless communication

13. Profibus PA is designed for:
(A) Process automation applications in hazardous areas
(B) Robotic motion control
(C) High-speed drives only
(D) Building automation

14. Ethernet/IP is an industrial protocol based on:
(A) Standard Ethernet and TCP/IP
(B) RS-232 serial communication
(C) Bluetooth wireless
(D) CAN bus only

15. The DeviceNet protocol is based on:
(A) CAN (Controller Area Network) technology
(B) RS-485 communication
(C) Ethernet backbone
(D) Optical fiber

16. The CANopen protocol is used for:
(A) Communication in embedded and automation systems
(B) Internet data transmission
(C) High-speed optical communication
(D) PLC programming

17. Foundation Fieldbus is primarily used in:
(A) Process automation for continuous control
(B) Building management systems
(C) Power transmission
(D) Robotic vision systems

18. In Modbus, the communication speed (baud rate) is typically up to:
(A) 115.2 kbps
(B) 9.6 kbps
(C) 4800 bps
(D) 1 Mbps

19. Industrial Ethernet refers to:
(A) Ethernet adapted for robust industrial environments
(B) Consumer-grade network cabling
(C) Wireless sensor networks
(D) Internet browsing in plants

20. The OSI model used in communication protocols consists of:
(A) Seven layers
(B) Five layers
(C) Three layers
(D) Nine layers

21. Data link layer in industrial communication handles:
(A) Error detection and frame synchronization
(B) Signal amplification
(C) Data encryption
(D) Software configuration

22. The application layer in protocols defines:
(A) The format and interpretation of data
(B) The physical signal transmission
(C) Electrical voltage levels
(D) Cable insulation types

23. Baud rate refers to:
(A) The number of signal changes per second in communication
(B) The length of the cable
(C) The number of nodes on a network
(D) The signal voltage

24. RS-485 communication supports:
(A) Multiple devices on a single bus line
(B) Only two devices
(C) Optical transmission
(D) Wireless data transfer

25. The physical layer in communication defines:
(A) Electrical and mechanical characteristics of connections
(B) Software instructions
(C) User access control
(D) Data structure

26. PROFINET is an industrial protocol based on:
(A) Industrial Ethernet
(B) RS-485
(C) CAN bus
(D) Optical control

27. WirelessHART is primarily used for:
(A) Wireless communication in process automation
(B) High-speed Ethernet transmission
(C) Robotic vision systems
(D) Motor control circuits

28. Industrial communication redundancy ensures:
(A) Continuous communication in case of link failure
(B) Reduced system cost
(C) Manual switching of devices
(D) Higher data compression

29. DNP3 protocol is widely used in:
(A) Electric power and utility systems
(B) HVAC systems
(C) Robotic control
(D) Automotive electronics

30. The key advantage of Modbus is:
(A) Simplicity and wide compatibility with devices
(B) High-cost hardware
(C) Proprietary vendor dependency
(D) Limited data range

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