Event-Triggered Protocols - Real-time Systems MCQs

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1. What is the main characteristic of event-triggered protocols in real-time systems?
(A) Messages are sent at fixed intervals
(B) Messages are transmitted in response to events rather than predefined time slots
(C) CPU idle time is maximized
(D) Memory usage is automatically reduced

2. Event-triggered protocols are typically used for:
(A) Soft real-time systems and non-critical tasks
(B) Hard real-time systems exclusively
(C) Batch processing only
(D) Disk scheduling

3. Which network protocol supports event-triggered communication?
(A) Time-Triggered Ethernet only
(B) CAN (Controller Area Network)
(C) TTP/C exclusively
(D) USB

4. In event-triggered systems, message transmission depends on:
(A) CPU idle periods exclusively
(B) Global clock synchronization
(C) Fixed time slots only
(D) Occurrence of events or data availability

5. Event-triggered protocols can lead to:
(A) Non-deterministic message delays due to network congestion
(B) Fully deterministic timing
(C) Predictable latency always
(D) Reduced memory usage automatically

6. Which of the following is an advantage of event-triggered protocols?
(A) Deterministic timing for hard real-time tasks
(B) Efficient bandwidth usage since messages are sent only when needed
(C) Avoids CPU preemption entirely
(D) Guarantees zero latency always

7. Which is a drawback of event-triggered protocols?
(A) Memory fragmentation
(B) Always uses maximum bandwidth
(C) Cannot guarantee hard real-time deadlines
(D) Batch file delays

8. CAN bus primarily implements which type of protocol behavior?
(A) Time-triggered exclusively
(B) Event-triggered with priority-based arbitration
(C) Batch-only communication
(D) Disk-based messaging

9. In event-triggered networks, message priority affects:
(A) Task period only
(B) Transmission order during contention
(C) CPU idle cycles exclusively
(D) Memory allocation

10. Event-triggered protocols are suitable for:
(A) CPU idle monitoring exclusively
(B) Periodic hard real-time tasks only
(C) Sporadic and aperiodic tasks
(D) Batch processing only

11. Event-triggered protocols are generally:
(A) Less deterministic than time-triggered protocols
(B) Fully deterministic always
(C) Used only for hard real-time control
(D) Memory optimization tools

12. Network congestion in event-triggered systems can cause:
(A) Memory leaks exclusively
(B) CPU idle only
(C) Delays and possible deadline misses
(D) Disk fragmentation

13. Which mechanism ensures higher-priority messages get transmitted first in CAN?
(A) Global time slots
(B) Non-destructive bitwise arbitration
(C) Batch processing exclusively
(D) CPU idle detection only

14. Event-triggered communication is typically:
(A) Asynchronous
(B) Synchronous always
(C) Deterministic for all tasks
(D) Batch-only

15. Which type of tasks benefit most from event-triggered protocols?
(A) Tasks with irregular or unpredictable arrival times
(B) Periodic hard real-time tasks only
(C) Background desktop tasks exclusively
(D) Disk batch operations only

16. Event-triggered systems require:
(A) Batch message buffering
(B) Fixed global schedule only
(C) CPU idle monitoring exclusively
(D) Priority management to handle message contention

17. Which CAN feature supports event-triggered real-time communication?
(A) Disk-based batch transmission
(B) Time-triggered schedule only
(C) CPU idle cycles only
(D) Priority-based message arbitration

18. Event-triggered protocols can be combined with time-triggered protocols to:
(A) Randomize message timing
(B) Achieve hybrid real-time communication
(C) Reduce memory usage automatically
(D) CPU idle exclusively

19. The main limitation of event-triggered protocols is:
(A) Unpredictable latency under high load
(B) Reduced CPU usage only
(C) Fully deterministic timing
(D) Batch processing exclusively

20. The main benefit of event-triggered protocols is:
(A) Reduces CPU temperature automatically
(B) Efficient use of network bandwidth for sporadic and asynchronous events
(C) Batch file transfer only
(D) Memory management exclusively

Event-Triggered Protocols – Real-time Systems MCQs

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