Backup Overloading – Real-time Systems MCQs

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1. What is backup overloading in real-time systems?
(A) Reducing CPU idle exclusively
(B) Running all primary tasks simultaneously
(C) Ignoring task deadlines
(D) Scheduling multiple backup tasks on the same processor or time slot to reduce resource usage

2. What is the main goal of backup overloading?
(A) Ignoring real-time constraints
(B) CPU idle exclusively
(C) Disk batch-only operations
(D) Efficient utilization of processors while maintaining fault tolerance

3. Which condition must be satisfied to safely perform backup overloading?
(A) All backups can run at the same time
(B) Backup tasks should not be active simultaneously due to primary task failures
(C) Deadlines can be missed arbitrarily
(D) CPU idle exclusively

4. Backup overloading helps reduce:
(A) Disk fragmentation only
(B) Processor idle time and backup resource wastage
(C) CPU cycles exclusively
(D) Memory allocation

5. Which real-time scheduling policy is often combined with backup overloading?
(A) Round-robin exclusively
(B) Earliest Deadline First (EDF)
(C) First-Come-First-Served only
(D) Batch scheduling

6. What is a potential risk of improper backup overloading?
(A) CPU idle exclusively
(B) Missed deadlines and insufficient fault coverage
(C) Disk-only batch conflicts
(D) Memory fragmentation

7. In backup overloading, the backup of a task is scheduled:
(A) Only if its primary task does not fail simultaneously with other overlapping backups
(B) At random times
(C) CPU idle exclusively
(D) Disk batch-only

8. Which method can verify safe backup overloading?
(A) Memory defragmentation
(B) CPU idle monitoring only
(C) Disk batch verification exclusively
(D) Fault simulation and schedulability analysis

9. Backup overloading is particularly useful in:
(A) Batch file processing only
(B) Multiprocessor real-time systems with limited resources
(C) Single CPU desktop systems exclusively
(D) Disk archival only

10. Which is a benefit of backup overloading?
(A) Memory optimization only
(B) CPU idle exclusively
(C) Disk batch-only efficiency
(D) Improved processor utilization and reduced redundancy overhead

11. Backup overloading requires careful:
(A) CPU idle exclusively
(B) Scheduling analysis to avoid conflicts between backups
(C) Disk-only scheduling
(D) Batch file management

12. In real-time systems, overloaded backups must ensure:
(A) Fault coverage without violating primary task deadlines
(B) CPU idle exclusively
(C) Disk-only backup safety
(D) Memory-only constraints

13. Which scenario illustrates unsafe backup overloading?
(A) Two backups on the same processor may execute simultaneously due to primary failures
(B) CPU idle exclusively
(C) Disk batch-only writes
(D) Memory defragmentation

14. Backup overloading reduces the need for:
(A) Batch-only execution
(B) CPU idle exclusively
(C) Disk-only storage
(D) Dedicated backup processors for each task

15. Fault-tolerant scheduling combined with backup overloading ensures:
(A) Memory-only allocation
(B) CPU idle exclusively
(C) Disk batch-only safety
(D) High system reliability with efficient resource usage

16. Overloaded backups must be analyzed using:
(A) Memory-only constraints
(B) CPU idle exclusively
(C) Disk-only timing
(D) Schedulability tests considering primary and backup task interactions

17. Backup overloading is commonly applied in:
(A) Disk archival only
(B) Batch-only desktop systems
(C) CPU idle exclusively
(D) Safety-critical multiprocessor real-time systems like avionics or industrial control

18. The success of backup overloading depends on:
(A) Disk batch scheduling
(B) CPU idle exclusively
(C) Accurate estimation of primary task failures and timing constraints
(D) Memory-only allocation

19. Backup overloading increases:
(A) Processor utilization while maintaining fault tolerance
(B) CPU idle exclusively
(C) Disk batch-only operations
(D) Memory fragmentation

20. The main advantage of backup overloading in real-time systems is:
(A) Efficient fault-tolerant scheduling with minimal resource overhead
(B) CPU idle exclusively
(C) Disk batch-only optimization
(D) Memory-only savings