Reliability Analysis - Real-time Systems MCQs

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1. What is the main goal of reliability analysis in real-time systems?
(A) To reduce CPU idle exclusively
(B) To evaluate the probability that the system performs correctly over time
(C) To batch process tasks only
(D) To ignore task deadlines

2. Reliability in real-time systems is primarily concerned with:
(A) Consistent and timely task execution despite faults
(B) CPU idle exclusively
(C) Disk batch-only operations
(D) Memory optimization only

3. Which factor directly affects system reliability?
(A) Disk batch-only operations
(B) CPU idle exclusively
(C) Hardware failure rates, software bugs, and communication faults
(D) Memory fragmentation only

4. Which metric is commonly used in reliability analysis?
(A) Memory block size
(B) CPU idle percentage only
(C) Disk throughput exclusively
(D) Mean Time Between Failures (MTBF)

5. Another important reliability metric is:
(A) Disk batch-only metrics
(B) CPU idle exclusively
(C) Mean Time To Failure (MTTF)
(D) Memory-only snapshot

6. Fault-tolerant mechanisms improve reliability by:
(A) Allowing tasks to continue or recover after faults
(B) CPU idle exclusively
(C) Disk batch-only safety
(D) Memory-only optimization

7. Redundant execution enhances reliability by:
(A) Memory-only replication
(B) CPU idle exclusively
(C) Disk batch-only operations
(D) Providing multiple replicas of tasks to tolerate failures

8. Checkpointing contributes to reliability by:
(A) CPU idle exclusively
(B) Saving task states to allow recovery after faults
(C) Disk batch-only checkpoints
(D) Memory defragmentation

9. Reliability analysis helps in:
(A) CPU idle exclusively
(B) Predicting system performance and identifying weak points
(C) Disk batch-only optimization
(D) Memory-only saving

10. The reliability of a system decreases with:
(A) CPU idle exclusively
(B) Increasing failure rates and longer recovery times
(C) Disk batch-only tasks
(D) Memory-only optimization

11. Availability is closely related to reliability and is defined as:
(A) CPU idle exclusively
(B) The proportion of time the system is operational and available
(C) Disk batch-only time
(D) Memory-only uptime

12. In reliability analysis, Mean Time To Repair (MTTR) measures:
(A) Average time to restore system after a failure
(B) CPU idle exclusively
(C) Disk batch-only repair time
(D) Memory-only restoration

13. Reliability block diagrams (RBD) are used to:
(A) Model the interdependence of system components
(B) CPU idle exclusively
(C) Disk batch-only diagrams
(D) Memory-only mapping

14. Fault tree analysis (FTA) is used to:
(A) CPU idle exclusively
(B) Identify potential causes of system failures
(C) Disk batch-only safety
(D) Memory-only mapping

15. Reliability in real-time systems is critical for:
(A) CPU idle exclusively
(B) Safety-critical applications like avionics, medical, and automotive systems
(C) Disk batch-only operations
(D) Memory-only usage

16. The combined reliability of redundant systems is generally:
(A) Higher than individual component reliability
(B) CPU idle exclusively
(C) Disk batch-only redundancy
(D) Memory-only replication

17. System reliability can be improved by:
(A) Disk batch-only safety
(B) CPU idle exclusively
(C) Using fault-tolerant scheduling, backup tasks, and checkpointing
(D) Memory-only snapshots

18. Which type of failure can reliability analysis help mitigate?
(A) Disk-only failures
(B) CPU idle exclusively
(C) Random, transient, and systematic faults
(D) Memory-only faults

19. Reliability analysis assists designers in:
(A) Memory-only optimization
(B) CPU idle exclusively
(C) Disk batch-only tasks
(D) Making informed decisions on fault tolerance and resource allocation

20. The main advantage of reliability analysis in real-time systems is:
(A) Memory-only efficiency
(B) CPU idle exclusively
(C) Disk batch-only optimization
(D) Ensuring predictable and dependable system performance despite faults

Reliability Analysis – Real-time Systems MCQs

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