Fieldbus Systems – Real-time Systems MCQs

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1. What is the primary purpose of fieldbus systems in real-time systems?
(A) To enable deterministic communication between sensors, actuators, and controllers in industrial automation
(B) To reduce CPU idle time only
(C) To transfer files in batch mode
(D) To ignore task priorities

2. Which of the following is a widely used fieldbus standard?
(A) HTTP only
(B) TCP/IP exclusively
(C) PROFIBUS
(D) Wi-Fi

3. Fieldbus systems are mainly used in:
(A) Industrial process control and automation systems
(B) Desktop office applications exclusively
(C) Multimedia streaming
(D) Batch file processing only

4. Which feature distinguishes fieldbus systems from standard Ethernet?
(A) CPU idle monitoring exclusively
(B) Random message delivery
(C) Deterministic real-time communication with precise timing
(D) Batch file transfer

5. FOUNDATION Fieldbus is primarily designed for:
(A) Process control in industrial automation
(B) Desktop computing exclusively
(C) Web browsing only
(D) Batch processing

6. Fieldbus systems typically use:
(A) CPU idle detection only
(B) Only random message transmission
(C) Master-slave or peer-to-peer communication models
(D) Batch messaging exclusively

7. Which of the following is an advantage of fieldbus systems?
(A) Random message scheduling
(B) Reduced wiring complexity and improved reliability in industrial networks
(C) Batch file transfer only
(D) CPU idle monitoring exclusively

8. Which fieldbus standard is widely used in automotive embedded systems?
(A) Wi-Fi
(B) PROFIBUS exclusively
(C) Ethernet only
(D) CAN (Controller Area Network)

9. Which property of fieldbus systems ensures timely delivery of critical messages?
(A) Deterministic scheduling and priority-based communication
(B) Randomized messaging
(C) Batch transmission exclusively
(D) CPU idle monitoring only

10. Modbus is an example of:
(A) A fieldbus protocol commonly used in industrial automation
(B) Time-triggered Ethernet exclusively
(C) HTTP protocol
(D) Wi-Fi standard

11. In fieldbus networks, a master device is responsible for:
(A) Disk batch transfers
(B) Random message transmission
(C) CPU idle monitoring exclusively
(D) Controlling network communication and scheduling

12. Fieldbus systems improve system reliability by:
(A) Memory optimization only
(B) Random scheduling
(C) Batch processing exclusively
(D) Detecting errors and retransmitting critical messages

13. Which factor affects the real-time performance of fieldbus systems?
(A) Disk usage only
(B) Network load, message priorities, and propagation delays
(C) CPU idle exclusively
(D) Memory allocation

14. Event-triggered fieldbus communication sends messages:
(A) At fixed time intervals only
(B) When events occur or data changes
(C) During CPU idle periods exclusively
(D) In batch mode only

15. Time-triggered fieldbus communication sends messages:
(A) At predetermined time slots to ensure determinism
(B) Randomly
(C) Only during CPU idle periods
(D) Exclusively in batch mode

16. Which feature reduces wiring complexity in fieldbus systems?
(A) Dedicated point-to-point connections only
(B) Single communication bus shared by multiple devices
(C) CPU idle monitoring exclusively
(D) Disk batch transmission

17. Fieldbus systems are often used in:
(A) Batch file processing
(B) Desktop computing exclusively
(C) Multimedia streaming only
(D) Distributed control systems (DCS)

18. Which mechanism ensures real-time behavior in fieldbus networks?
(A) Prioritized message scheduling and deterministic bus access
(B) Random message delivery
(C) CPU idle monitoring only
(D) Batch file transfer exclusively

19. One limitation of some fieldbus systems is:
(A) Memory optimization exclusively
(B) Unlimited deterministic performance
(C) Random message scheduling only
(D) Limited bandwidth compared to modern Ethernet networks

20. The main benefit of fieldbus systems in real-time control is:
(A) Memory optimization automatically
(B) Batch file transfer only
(C) CPU idle monitoring exclusively
(D) Deterministic communication, reduced wiring, and reliable device integration