ReasoningAbility.com

Machine Breakdown Recovery: Worksheet 6 - Intermediate-Advanced Practice Machine Breakdown Recovery INTERMEDIATE ADVANCED

Ready to master Machine Breakdown Recovery? This timed practice ⚡ worksheet (6/10) presents 20 intermediate-advanced-level challenges. Focus area: speed building. Learn to solve machine breakdown recovery tricks, handle machine breakdown recovery shortcut methods, and perfect machine breakdown recovery bank exam questions with our step-by-step solutions.

📝 Worksheet 6 of 10 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate Advanced level

What you'll learn in this worksheet:
Your progress through Machine Breakdown Recovery
Worksheet 6 of 10 (55% complete)

Question 1

A machine needs to process 4 jobs. Processing times: - Job C: 75 minutes - Job A: 35 minutes - Job B: 41 minutes - Job E: 44 minutes The machine breaks down at 114 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 B → Job E → Job C
2. Simulate processing with breakdown:
- Job A: 0 → 35
- Job B: 35 → 76
- Job E: Starts at 76, breakdown at 114 (38 min completed), repair 19 min, resume 6 min → completes at 139
- Job C: 139 → 214

3. Total makespan: 214 minutes
4. Delay caused by breakdown: 19 minutes

Answer: 214 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 D: 69 minutes - Job A: 90 minutes - Job E: 84 minutes - Job C: 37 minutes The machine breaks down at 90 minutes and takes 16 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 D → Job E → Job A
2. Simulate processing with breakdown:
- Job C: 0 → 37
- Job D: Starts at 37, breakdown at 90 (53 min completed), repair 16 min, resume 16 min → completes at 122
- Job E: 122 → 206
- Job A: 206 → 296

3. Total makespan: 296 minutes
4. Delay caused by breakdown: 16 minutes

Answer: 296 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 E: 32 minutes - Job C: 81 minutes - Job B: 81 minutes - Job A: 69 minutes The machine breaks down at 107 minutes and takes 36 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 C → Job B
2. Simulate processing with breakdown:
- Job E: 0 → 32
- Job A: 32 → 101
- Job C: Starts at 101, breakdown at 107 (6 min completed), repair 36 min, resume 75 min → completes at 218
- Job B: 218 → 299

3. Total makespan: 299 minutes
4. Delay caused by breakdown: 36 minutes

Answer: 299 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 D: 66 minutes - Job B: 83 minutes - Job C: 66 minutes - Job E: 84 minutes The machine breaks down at 82 minutes and takes 40 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 B → Job E
2. Simulate processing with breakdown:
- Job D: 0 → 66
- Job C: Starts at 66, breakdown at 82 (16 min completed), repair 40 min, resume 50 min → completes at 172
- Job B: 172 → 255
- Job E: 255 → 339

3. Total makespan: 339 minutes
4. Delay caused by breakdown: 40 minutes

Answer: 339 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 E: 74 minutes - Job B: 65 minutes - Job C: 64 minutes - Job D: 67 minutes The machine breaks down at 119 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 B → Job D → Job E
2. Simulate processing with breakdown:
- Job C: 0 → 64
- Job B: Starts at 64, breakdown at 119 (55 min completed), repair 37 min, resume 10 min → completes at 166
- Job D: 166 → 233
- Job E: 233 → 307

3. Total makespan: 307 minutes
4. Delay caused by breakdown: 37 minutes

Answer: 307 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: 67 minutes - Job B: 51 minutes - Job D: 60 minutes - Job C: 71 minutes The machine breaks down at 62 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 B → Job D → Job E → Job C
2. Simulate processing with breakdown:
- Job B: 0 → 51
- Job D: Starts at 51, breakdown at 62 (11 min completed), repair 22 min, resume 49 min → completes at 133
- Job E: 133 → 200
- Job C: 200 → 271

3. Total makespan: 271 minutes
4. Delay caused by breakdown: 22 minutes

Answer: 271 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: 73 minutes - Job E: 60 minutes - Job C: 59 minutes - Job B: 31 minutes The machine breaks down at 60 minutes and takes 21 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 E → Job A
2. Simulate processing with breakdown:
- Job B: 0 → 31
- Job C: Starts at 31, breakdown at 60 (29 min completed), repair 21 min, resume 30 min → completes at 111
- Job E: 111 → 171
- Job A: 171 → 244

3. Total makespan: 244 minutes
4. Delay caused by breakdown: 21 minutes

Answer: 244 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 D: 52 minutes - Job E: 33 minutes - Job A: 39 minutes - Job B: 58 minutes The machine breaks down at 120 minutes and takes 40 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 D → Job B
2. Simulate processing with breakdown:
- Job E: 0 → 33
- Job A: 33 → 72
- Job D: Starts at 72, breakdown at 120 (48 min completed), repair 40 min, resume 4 min → completes at 164
- Job B: 164 → 222

3. Total makespan: 222 minutes
4. Delay caused by breakdown: 40 minutes

Answer: 222 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 A: 36 minutes - Job E: 39 minutes - Job B: 33 minutes - Job C: 69 minutes The machine breaks down at 91 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 B → Job A → Job E → Job C
2. Simulate processing with breakdown:
- Job B: 0 → 33
- Job A: 33 → 69
- Job E: Starts at 69, breakdown at 91 (22 min completed), repair 23 min, resume 17 min → completes at 131
- Job C: 131 → 200

3. Total makespan: 200 minutes
4. Delay caused by breakdown: 23 minutes

Answer: 200 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 D: 35 minutes - Job B: 30 minutes - Job E: 50 minutes - Job A: 72 minutes The machine breaks down at 83 minutes and takes 42 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 E → Job A
2. Simulate processing with breakdown:
- Job B: 0 → 30
- Job D: 30 → 65
- Job E: Starts at 65, breakdown at 83 (18 min completed), repair 42 min, resume 32 min → completes at 157
- Job A: 157 → 229

3. Total makespan: 229 minutes
4. Delay caused by breakdown: 42 minutes

Answer: 229 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 D: 41 minutes - Job A: 85 minutes - Job E: 57 minutes - Job B: 32 minutes The machine breaks down at 96 minutes and takes 34 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 E → Job A
2. Simulate processing with breakdown:
- Job B: 0 → 32
- Job D: 32 → 73
- Job E: Starts at 73, breakdown at 96 (23 min completed), repair 34 min, resume 34 min → completes at 164
- Job A: 164 → 249

3. Total makespan: 249 minutes
4. Delay caused by breakdown: 34 minutes

Answer: 249 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 E: 74 minutes - Job C: 70 minutes - Job B: 73 minutes - Job D: 43 minutes The machine breaks down at 118 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 D → Job C → Job B → Job E
2. Simulate processing with breakdown:
- Job D: 0 → 43
- Job C: 43 → 113
- Job B: Starts at 113, breakdown at 118 (5 min completed), repair 27 min, resume 68 min → completes at 213
- Job E: 213 → 287

3. Total makespan: 287 minutes
4. Delay caused by breakdown: 27 minutes

Answer: 287 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 D: 82 minutes - Job A: 48 minutes - Job E: 41 minutes - Job C: 78 minutes The machine breaks down at 80 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 E → Job A → Job C → Job D
2. Simulate processing with breakdown:
- Job E: 0 → 41
- Job A: Starts at 41, breakdown at 80 (39 min completed), repair 45 min, resume 9 min → completes at 134
- Job C: 134 → 212
- Job D: 212 → 294

3. Total makespan: 294 minutes
4. Delay caused by breakdown: 45 minutes

Answer: 294 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 E: 56 minutes - Job A: 50 minutes - Job B: 65 minutes - Job C: 61 minutes The machine breaks down at 73 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 A → Job E → Job C → Job B
2. Simulate processing with breakdown:
- Job A: 0 → 50
- Job E: Starts at 50, breakdown at 73 (23 min completed), repair 45 min, resume 33 min → completes at 151
- Job C: 151 → 212
- Job B: 212 → 277

3. Total makespan: 277 minutes
4. Delay caused by breakdown: 45 minutes

Answer: 277 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 A: 65 minutes - Job E: 86 minutes - Job B: 73 minutes - Job C: 36 minutes The machine breaks down at 72 minutes and takes 25 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 → 36
- Job A: Starts at 36, breakdown at 72 (36 min completed), repair 25 min, resume 29 min → completes at 126
- Job B: 126 → 199
- Job E: 199 → 285

3. Total makespan: 285 minutes
4. Delay caused by breakdown: 25 minutes

Answer: 285 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 B: 53 minutes - Job A: 82 minutes - Job C: 75 minutes - Job D: 57 minutes The machine breaks down at 63 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 B → Job D → Job C → Job A
2. Simulate processing with breakdown:
- Job B: 0 → 53
- Job D: Starts at 53, breakdown at 63 (10 min completed), repair 44 min, resume 47 min → completes at 154
- Job C: 154 → 229
- Job A: 229 → 311

3. Total makespan: 311 minutes
4. Delay caused by breakdown: 44 minutes

Answer: 311 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: 70 minutes - Job A: 76 minutes - Job E: 37 minutes - Job C: 59 minutes The machine breaks down at 105 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 E → Job C → Job B → Job A
2. Simulate processing with breakdown:
- Job E: 0 → 37
- Job C: 37 → 96
- Job B: Starts at 96, breakdown at 105 (9 min completed), repair 15 min, resume 61 min → completes at 181
- Job A: 181 → 257

3. Total makespan: 257 minutes
4. Delay caused by breakdown: 15 minutes

Answer: 257 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 B: 39 minutes - Job E: 34 minutes - Job C: 68 minutes - Job A: 84 minutes The machine breaks down at 76 minutes and takes 18 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 C → Job A
2. Simulate processing with breakdown:
- Job E: 0 → 34
- Job B: 34 → 73
- Job C: Starts at 73, breakdown at 76 (3 min completed), repair 18 min, resume 65 min → completes at 159
- Job A: 159 → 243

3. Total makespan: 243 minutes
4. Delay caused by breakdown: 18 minutes

Answer: 243 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 E: 77 minutes - Job C: 57 minutes - Job A: 90 minutes - Job B: 63 minutes The machine breaks down at 104 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 C → Job B → Job E → Job A
2. Simulate processing with breakdown:
- Job C: 0 → 57
- Job B: Starts at 57, breakdown at 104 (47 min completed), repair 27 min, resume 16 min → completes at 147
- Job E: 147 → 224
- Job A: 224 → 314

3. Total makespan: 314 minutes
4. Delay caused by breakdown: 27 minutes

Answer: 314 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: 79 minutes - Job B: 83 minutes - Job D: 61 minutes - Job C: 46 minutes The machine breaks down at 100 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 C → Job D → Job E → Job B
2. Simulate processing with breakdown:
- Job C: 0 → 46
- Job D: Starts at 46, breakdown at 100 (54 min completed), repair 44 min, resume 7 min → completes at 151
- Job E: 151 → 230
- Job B: 230 → 313

3. Total makespan: 313 minutes
4. Delay caused by breakdown: 44 minutes

Answer: 313 minutes

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