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Machine Breakdown Recovery: Worksheet 10 - Expert Practice Machine Breakdown Recovery EXPERT

Ready to master Machine Breakdown Recovery? This accuracy focus 👑 worksheet (10/10) presents 20 expert-level challenges. Focus area: application-based learning. Learn to solve machine breakdown recovery reasoning tricks, handle fast machine breakdown recovery solving, and perfect machine breakdown recovery mastery with our step-by-step solutions.

📝 Worksheet 10 of 10 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Expert level

What you'll learn in this worksheet:
Your progress through Machine Breakdown Recovery
Worksheet 10 of 10 (100% complete)

Question 1

A machine needs to process 4 jobs. Processing times: - Job B: 35 minutes - Job A: 63 minutes - Job C: 50 minutes - Job D: 30 minutes The machine breaks down at 109 minutes and takes 33 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job D → Job B → Job C → Job A
2. Simulate processing with breakdown:
- Job D: 0 → 30
- Job B: 30 → 65
- Job C: Starts at 65, breakdown at 109 (44 min completed), repair 33 min, resume 6 min → completes at 148
- Job A: 148 → 211

3. Total makespan: 211 minutes
4. Delay caused by breakdown: 33 minutes

Answer: 211 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 2

A machine needs to process 4 jobs. Processing times: - Job E: 81 minutes - Job C: 47 minutes - Job A: 60 minutes - Job B: 75 minutes The machine breaks down at 97 minutes and takes 37 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job C → Job A → Job B → Job E
2. Simulate processing with breakdown:
- Job C: 0 → 47
- Job A: Starts at 47, breakdown at 97 (50 min completed), repair 37 min, resume 10 min → completes at 144
- Job B: 144 → 219
- Job E: 219 → 300

3. Total makespan: 300 minutes
4. Delay caused by breakdown: 37 minutes

Answer: 300 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 3

A machine needs to process 4 jobs. Processing times: - Job B: 54 minutes - Job D: 86 minutes - Job A: 75 minutes - Job C: 73 minutes The machine breaks down at 119 minutes and takes 20 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job B → Job C → Job A → Job D
2. Simulate processing with breakdown:
- Job B: 0 → 54
- Job C: Starts at 54, breakdown at 119 (65 min completed), repair 20 min, resume 8 min → completes at 147
- Job A: 147 → 222
- Job D: 222 → 308

3. Total makespan: 308 minutes
4. Delay caused by breakdown: 20 minutes

Answer: 308 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 4

A machine needs to process 4 jobs. Processing times: - Job C: 32 minutes - Job A: 35 minutes - Job D: 41 minutes - Job E: 64 minutes The machine breaks down at 112 minutes and takes 23 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job C → Job A → Job D → Job E
2. Simulate processing with breakdown:
- Job C: 0 → 32
- Job A: 32 → 67
- Job D: 67 → 108
- Job E: Starts at 108, breakdown at 112 (4 min completed), repair 23 min, resume 60 min → completes at 195

3. Total makespan: 195 minutes
4. Delay caused by breakdown: 23 minutes

Answer: 195 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 5

A machine needs to process 4 jobs. Processing times: - Job C: 83 minutes - Job B: 32 minutes - Job E: 86 minutes - Job D: 36 minutes The machine breaks down at 92 minutes and takes 43 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job B → Job D → Job C → Job E
2. Simulate processing with breakdown:
- Job B: 0 → 32
- Job D: 32 → 68
- Job C: Starts at 68, breakdown at 92 (24 min completed), repair 43 min, resume 59 min → completes at 194
- Job E: 194 → 280

3. Total makespan: 280 minutes
4. Delay caused by breakdown: 43 minutes

Answer: 280 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 6

A machine needs to process 4 jobs. Processing times: - Job E: 57 minutes - Job C: 30 minutes - Job D: 43 minutes - Job B: 39 minutes The machine breaks down at 108 minutes and takes 26 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job C → Job B → Job D → Job E
2. Simulate processing with breakdown:
- Job C: 0 → 30
- Job B: 30 → 69
- Job D: Starts at 69, breakdown at 108 (39 min completed), repair 26 min, resume 4 min → completes at 138
- Job E: 138 → 195

3. Total makespan: 195 minutes
4. Delay caused by breakdown: 26 minutes

Answer: 195 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 7

A machine needs to process 4 jobs. Processing times: - Job A: 67 minutes - Job E: 44 minutes - Job B: 60 minutes - Job D: 84 minutes The machine breaks down at 73 minutes and takes 28 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job E → Job B → Job A → Job D
2. Simulate processing with breakdown:
- Job E: 0 → 44
- Job B: Starts at 44, breakdown at 73 (29 min completed), repair 28 min, resume 31 min → completes at 132
- Job A: 132 → 199
- Job D: 199 → 283

3. Total makespan: 283 minutes
4. Delay caused by breakdown: 28 minutes

Answer: 283 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 8

A machine needs to process 4 jobs. Processing times: - Job E: 30 minutes - Job B: 65 minutes - Job A: 77 minutes - Job D: 69 minutes The machine breaks down at 61 minutes and takes 19 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job E → Job B → Job D → Job A
2. Simulate processing with breakdown:
- Job E: 0 → 30
- Job B: Starts at 30, breakdown at 61 (31 min completed), repair 19 min, resume 34 min → completes at 114
- Job D: 114 → 183
- Job A: 183 → 260

3. Total makespan: 260 minutes
4. Delay caused by breakdown: 19 minutes

Answer: 260 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 9

A machine needs to process 4 jobs. Processing times: - Job D: 77 minutes - Job E: 75 minutes - Job C: 63 minutes - Job A: 73 minutes The machine breaks down at 80 minutes and takes 33 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job C → Job A → Job E → Job D
2. Simulate processing with breakdown:
- Job C: 0 → 63
- Job A: Starts at 63, breakdown at 80 (17 min completed), repair 33 min, resume 56 min → completes at 169
- Job E: 169 → 244
- Job D: 244 → 321

3. Total makespan: 321 minutes
4. Delay caused by breakdown: 33 minutes

Answer: 321 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 10

A machine needs to process 4 jobs. Processing times: - Job A: 41 minutes - Job D: 86 minutes - Job B: 83 minutes - Job C: 62 minutes The machine breaks down at 64 minutes and takes 31 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job A → Job C → Job B → Job D
2. Simulate processing with breakdown:
- Job A: 0 → 41
- Job C: Starts at 41, breakdown at 64 (23 min completed), repair 31 min, resume 39 min → completes at 134
- Job B: 134 → 217
- Job D: 217 → 303

3. Total makespan: 303 minutes
4. Delay caused by breakdown: 31 minutes

Answer: 303 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 11

A machine needs to process 4 jobs. Processing times: - Job B: 60 minutes - Job E: 84 minutes - Job D: 57 minutes - Job C: 85 minutes The machine breaks down at 117 minutes and takes 30 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job D → Job B → Job E → Job C
2. Simulate processing with breakdown:
- Job D: 0 → 57
- Job B: 57 → 117
- Job E: Starts at 117, breakdown at 117 (0 min completed), repair 30 min, resume 84 min → completes at 231
- Job C: 231 → 316

3. Total makespan: 316 minutes
4. Delay caused by breakdown: 30 minutes

Answer: 316 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 12

A machine needs to process 4 jobs. Processing times: - Job C: 77 minutes - Job A: 42 minutes - Job B: 84 minutes - Job E: 56 minutes The machine breaks down at 78 minutes and takes 19 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job A → Job E → Job C → Job B
2. Simulate processing with breakdown:
- Job A: 0 → 42
- Job E: Starts at 42, breakdown at 78 (36 min completed), repair 19 min, resume 20 min → completes at 117
- Job C: 117 → 194
- Job B: 194 → 278

3. Total makespan: 278 minutes
4. Delay caused by breakdown: 19 minutes

Answer: 278 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 13

A machine needs to process 4 jobs. Processing times: - Job B: 48 minutes - Job E: 53 minutes - Job C: 57 minutes - Job D: 64 minutes The machine breaks down at 91 minutes and takes 27 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job B → Job E → Job C → Job D
2. Simulate processing with breakdown:
- Job B: 0 → 48
- Job E: Starts at 48, breakdown at 91 (43 min completed), repair 27 min, resume 10 min → completes at 128
- Job C: 128 → 185
- Job D: 185 → 249

3. Total makespan: 249 minutes
4. Delay caused by breakdown: 27 minutes

Answer: 249 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 14

A machine needs to process 4 jobs. Processing times: - Job B: 65 minutes - Job A: 47 minutes - Job E: 36 minutes - Job C: 69 minutes The machine breaks down at 78 minutes and takes 32 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job E → Job A → Job B → Job C
2. Simulate processing with breakdown:
- Job E: 0 → 36
- Job A: Starts at 36, breakdown at 78 (42 min completed), repair 32 min, resume 5 min → completes at 115
- Job B: 115 → 180
- Job C: 180 → 249

3. Total makespan: 249 minutes
4. Delay caused by breakdown: 32 minutes

Answer: 249 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 15

A machine needs to process 4 jobs. Processing times: - Job B: 42 minutes - Job E: 81 minutes - Job A: 33 minutes - Job C: 58 minutes The machine breaks down at 70 minutes and takes 37 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job A → Job B → Job C → Job E
2. Simulate processing with breakdown:
- Job A: 0 → 33
- Job B: Starts at 33, breakdown at 70 (37 min completed), repair 37 min, resume 5 min → completes at 112
- Job C: 112 → 170
- Job E: 170 → 251

3. Total makespan: 251 minutes
4. Delay caused by breakdown: 37 minutes

Answer: 251 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 16

A machine needs to process 4 jobs. Processing times: - Job D: 83 minutes - Job C: 44 minutes - Job A: 71 minutes - Job B: 48 minutes The machine breaks down at 94 minutes and takes 15 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job C → Job B → Job A → Job D
2. Simulate processing with breakdown:
- Job C: 0 → 44
- Job B: 44 → 92
- Job A: Starts at 92, breakdown at 94 (2 min completed), repair 15 min, resume 69 min → completes at 178
- Job D: 178 → 261

3. Total makespan: 261 minutes
4. Delay caused by breakdown: 15 minutes

Answer: 261 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 17

A machine needs to process 4 jobs. Processing times: - Job B: 49 minutes - Job E: 30 minutes - Job C: 86 minutes - Job A: 59 minutes The machine breaks down at 71 minutes and takes 44 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job E → Job B → Job A → Job C
2. Simulate processing with breakdown:
- Job E: 0 → 30
- Job B: Starts at 30, breakdown at 71 (41 min completed), repair 44 min, resume 8 min → completes at 123
- Job A: 123 → 182
- Job C: 182 → 268

3. Total makespan: 268 minutes
4. Delay caused by breakdown: 44 minutes

Answer: 268 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 18

A machine needs to process 4 jobs. Processing times: - Job C: 90 minutes - Job B: 42 minutes - Job D: 59 minutes - Job A: 68 minutes The machine breaks down at 108 minutes and takes 26 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job B → Job D → Job A → Job C
2. Simulate processing with breakdown:
- Job B: 0 → 42
- Job D: 42 → 101
- Job A: Starts at 101, breakdown at 108 (7 min completed), repair 26 min, resume 61 min → completes at 195
- Job C: 195 → 285

3. Total makespan: 285 minutes
4. Delay caused by breakdown: 26 minutes

Answer: 285 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 19

A machine needs to process 4 jobs. Processing times: - Job A: 88 minutes - Job B: 57 minutes - Job D: 41 minutes - Job E: 73 minutes The machine breaks down at 68 minutes and takes 45 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job D → Job B → Job E → Job A
2. Simulate processing with breakdown:
- Job D: 0 → 41
- Job B: Starts at 41, breakdown at 68 (27 min completed), repair 45 min, resume 30 min → completes at 143
- Job E: 143 → 216
- Job A: 216 → 304

3. Total makespan: 304 minutes
4. Delay caused by breakdown: 45 minutes

Answer: 304 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.

Question 20

A machine needs to process 4 jobs. Processing times: - Job E: 85 minutes - Job A: 85 minutes - Job D: 39 minutes - Job C: 58 minutes The machine breaks down at 91 minutes and takes 22 minutes to repair. Jobs are scheduled using Shortest Processing Time (SPT) first rule. What is the total completion time (makespan) after handling the breakdown?
Step-by-step solution (Breakdown Recovery):

1. Original SPT order: Job D → Job C → Job E → Job A
2. Simulate processing with breakdown:
- Job D: 0 → 39
- Job C: Starts at 39, breakdown at 91 (52 min completed), repair 22 min, resume 6 min → completes at 119
- Job E: 119 → 204
- Job A: 204 → 289

3. Total makespan: 289 minutes
4. Delay caused by breakdown: 22 minutes

Answer: 289 minutes

Key Strategy: Simulate the timeline, account for breakdown during active job processing.
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