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Master Machine Breakdown Recovery - Intermediate-Advanced Level Problems Machine Breakdown Recovery INTERMEDIATE ADVANCED

Excel in competitive exams with this self assessment worksheet on Machine Breakdown Recovery. Worksheet 7 of 10 contains 20 intermediate-advanced-level problems. Target your accuracy improvement skills while practicing machine breakdown recovery shortcut methods, machine breakdown recovery bank exam questions, and machine breakdown recovery ssc cgl.

📝 Worksheet 7 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 7 of 10 (66% complete)

Question 1

A machine needs to process 4 jobs. Processing times: - Job A: 88 minutes - Job E: 35 minutes - Job D: 36 minutes - Job B: 49 minutes The machine breaks down at 66 minutes and takes 39 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 D → Job B → Job A
2. Simulate processing with breakdown:
- Job E: 0 → 35
- Job D: Starts at 35, breakdown at 66 (31 min completed), repair 39 min, resume 5 min → completes at 110
- Job B: 110 → 159
- Job A: 159 → 247

3. Total makespan: 247 minutes
4. Delay caused by breakdown: 39 minutes

Answer: 247 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: 69 minutes - Job A: 84 minutes - Job B: 74 minutes - Job C: 67 minutes The machine breaks down at 60 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 C → Job E → Job B → Job A
2. Simulate processing with breakdown:
- Job C: Starts at 0, breakdown at 60 (60 min completed), repair 36 min, resume 7 min → completes at 103
- Job E: 103 → 172
- Job B: 172 → 246
- Job A: 246 → 330

3. Total makespan: 330 minutes
4. Delay caused by breakdown: 36 minutes

Answer: 330 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: 34 minutes - Job B: 60 minutes - Job C: 42 minutes - Job D: 42 minutes The machine breaks down at 108 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 E → Job C → Job D → Job B
2. Simulate processing with breakdown:
- Job E: 0 → 34
- Job C: 34 → 76
- Job D: Starts at 76, breakdown at 108 (32 min completed), repair 22 min, resume 10 min → completes at 140
- Job B: 140 → 200

3. Total makespan: 200 minutes
4. Delay caused by breakdown: 22 minutes

Answer: 200 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 A: 74 minutes - Job D: 46 minutes - Job C: 72 minutes - Job E: 39 minutes The machine breaks down at 73 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 E → Job D → Job C → Job A
2. Simulate processing with breakdown:
- Job E: 0 → 39
- Job D: Starts at 39, breakdown at 73 (34 min completed), repair 42 min, resume 12 min → completes at 127
- Job C: 127 → 199
- Job A: 199 → 273

3. Total makespan: 273 minutes
4. Delay caused by breakdown: 42 minutes

Answer: 273 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: 39 minutes - Job D: 71 minutes - Job B: 55 minutes - Job A: 44 minutes The machine breaks down at 115 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 E → Job A → Job B → Job D
2. Simulate processing with breakdown:
- Job E: 0 → 39
- Job A: 39 → 83
- Job B: Starts at 83, breakdown at 115 (32 min completed), repair 42 min, resume 23 min → completes at 180
- Job D: 180 → 251

3. Total makespan: 251 minutes
4. Delay caused by breakdown: 42 minutes

Answer: 251 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 C: 49 minutes - Job E: 80 minutes - Job B: 73 minutes - Job D: 34 minutes The machine breaks down at 120 minutes and takes 38 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 → 34
- Job C: 34 → 83
- Job B: Starts at 83, breakdown at 120 (37 min completed), repair 38 min, resume 36 min → completes at 194
- Job E: 194 → 274

3. Total makespan: 274 minutes
4. Delay caused by breakdown: 38 minutes

Answer: 274 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 C: 63 minutes - Job A: 55 minutes - Job B: 86 minutes - Job D: 64 minutes The machine breaks down at 82 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 A → Job C → Job D → Job B
2. Simulate processing with breakdown:
- Job A: 0 → 55
- Job C: Starts at 55, breakdown at 82 (27 min completed), repair 34 min, resume 36 min → completes at 152
- Job D: 152 → 216
- Job B: 216 → 302

3. Total makespan: 302 minutes
4. Delay caused by breakdown: 34 minutes

Answer: 302 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 A: 73 minutes - Job C: 65 minutes - Job D: 36 minutes - Job E: 63 minutes The machine breaks down at 61 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 D → Job E → Job C → Job A
2. Simulate processing with breakdown:
- Job D: 0 → 36
- Job E: Starts at 36, breakdown at 61 (25 min completed), repair 16 min, resume 38 min → completes at 115
- Job C: 115 → 180
- Job A: 180 → 253

3. Total makespan: 253 minutes
4. Delay caused by breakdown: 16 minutes

Answer: 253 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 C: 38 minutes - Job A: 43 minutes - Job D: 58 minutes - Job E: 59 minutes The machine breaks down at 95 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 C → Job A → Job D → Job E
2. Simulate processing with breakdown:
- Job C: 0 → 38
- Job A: 38 → 81
- Job D: Starts at 81, breakdown at 95 (14 min completed), repair 43 min, resume 44 min → completes at 182
- Job E: 182 → 241

3. Total makespan: 241 minutes
4. Delay caused by breakdown: 43 minutes

Answer: 241 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 B: 85 minutes - Job C: 80 minutes - Job E: 47 minutes - Job D: 69 minutes The machine breaks down at 112 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 E → Job D → Job C → Job B
2. Simulate processing with breakdown:
- Job E: 0 → 47
- Job D: Starts at 47, breakdown at 112 (65 min completed), repair 16 min, resume 4 min → completes at 132
- Job C: 132 → 212
- Job B: 212 → 297

3. Total makespan: 297 minutes
4. Delay caused by breakdown: 16 minutes

Answer: 297 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: 77 minutes - Job C: 37 minutes - Job A: 70 minutes - Job E: 34 minutes The machine breaks down at 75 minutes and takes 41 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 A → Job D
2. Simulate processing with breakdown:
- Job E: 0 → 34
- Job C: 34 → 71
- Job A: Starts at 71, breakdown at 75 (4 min completed), repair 41 min, resume 66 min → completes at 182
- Job D: 182 → 259

3. Total makespan: 259 minutes
4. Delay caused by breakdown: 41 minutes

Answer: 259 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 D: 30 minutes - Job C: 63 minutes - Job E: 61 minutes - Job B: 51 minutes The machine breaks down at 112 minutes and takes 38 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 → 30
- Job B: 30 → 81
- Job E: Starts at 81, breakdown at 112 (31 min completed), repair 38 min, resume 30 min → completes at 180
- Job C: 180 → 243

3. Total makespan: 243 minutes
4. Delay caused by breakdown: 38 minutes

Answer: 243 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 E: 30 minutes - Job B: 61 minutes - Job C: 49 minutes - Job D: 47 minutes The machine breaks down at 74 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 D → Job C → Job B
2. Simulate processing with breakdown:
- Job E: 0 → 30
- Job D: Starts at 30, breakdown at 74 (44 min completed), repair 44 min, resume 3 min → completes at 121
- Job C: 121 → 170
- Job B: 170 → 231

3. Total makespan: 231 minutes
4. Delay caused by breakdown: 44 minutes

Answer: 231 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 A: 40 minutes - Job E: 75 minutes - Job C: 34 minutes - Job B: 87 minutes The machine breaks down at 60 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 C → Job A → Job E → Job B
2. Simulate processing with breakdown:
- Job C: 0 → 34
- Job A: Starts at 34, breakdown at 60 (26 min completed), repair 19 min, resume 14 min → completes at 93
- Job E: 93 → 168
- Job B: 168 → 255

3. Total makespan: 255 minutes
4. Delay caused by breakdown: 19 minutes

Answer: 255 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: 55 minutes - Job B: 44 minutes - Job D: 76 minutes - Job E: 45 minutes The machine breaks down at 105 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 B → Job E → Job A → Job D
2. Simulate processing with breakdown:
- Job B: 0 → 44
- Job E: 44 → 89
- Job A: Starts at 89, breakdown at 105 (16 min completed), repair 19 min, resume 39 min → completes at 163
- Job D: 163 → 239

3. Total makespan: 239 minutes
4. Delay caused by breakdown: 19 minutes

Answer: 239 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 E: 86 minutes - Job A: 79 minutes - Job C: 44 minutes - Job D: 59 minutes The machine breaks down at 77 minutes and takes 38 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 A → Job E
2. Simulate processing with breakdown:
- Job C: 0 → 44
- Job D: Starts at 44, breakdown at 77 (33 min completed), repair 38 min, resume 26 min → completes at 141
- Job A: 141 → 220
- Job E: 220 → 306

3. Total makespan: 306 minutes
4. Delay caused by breakdown: 38 minutes

Answer: 306 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 C: 46 minutes - Job A: 73 minutes - Job E: 76 minutes - Job D: 70 minutes The machine breaks down at 81 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 A → Job E
2. Simulate processing with breakdown:
- Job C: 0 → 46
- Job D: Starts at 46, breakdown at 81 (35 min completed), repair 16 min, resume 35 min → completes at 132
- Job A: 132 → 205
- Job E: 205 → 281

3. Total makespan: 281 minutes
4. Delay caused by breakdown: 16 minutes

Answer: 281 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 A: 63 minutes - Job E: 45 minutes - Job C: 44 minutes - Job B: 32 minutes The machine breaks down at 94 minutes and takes 39 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 → 32
- Job C: 32 → 76
- Job E: Starts at 76, breakdown at 94 (18 min completed), repair 39 min, resume 27 min → completes at 160
- Job A: 160 → 223

3. Total makespan: 223 minutes
4. Delay caused by breakdown: 39 minutes

Answer: 223 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: 49 minutes - Job D: 84 minutes - Job E: 34 minutes - Job C: 81 minutes The machine breaks down at 90 minutes and takes 41 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 → 34
- Job A: 34 → 83
- Job C: Starts at 83, breakdown at 90 (7 min completed), repair 41 min, resume 74 min → completes at 205
- Job D: 205 → 289

3. Total makespan: 289 minutes
4. Delay caused by breakdown: 41 minutes

Answer: 289 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 B: 87 minutes - Job D: 39 minutes - Job C: 46 minutes - Job E: 71 minutes The machine breaks down at 117 minutes and takes 35 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 B
2. Simulate processing with breakdown:
- Job D: 0 → 39
- Job C: 39 → 85
- Job E: Starts at 85, breakdown at 117 (32 min completed), repair 35 min, resume 39 min → completes at 191
- Job B: 191 → 278

3. Total makespan: 278 minutes
4. Delay caused by breakdown: 35 minutes

Answer: 278 minutes

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