Select the correct statement: A dummy activity in a PERT/CPM network indicates that it_________________?
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Answer: C. consumes neither time nor resources
Explanation
A dummy activity is represented by a dashed arrow in PERT and CPM network diagrams. It is used solely to maintain correct logical precedence relationships between events. Because it is a conceptual link, it consumes neither time nor physical resources. Network rules dictate that two events cannot share the same start and finish node numbers. Dummy arrows resolve naming conflicts and clarify complex network dependency logic. Zero duration and zero resource consumption distinguish dummy activities from real work tasks.
Project schedulers insert dummy activities when configuring complex logic in software models. Understanding dummy tasks prevents errors in calculating earliest and latest event times. Network optimization relies on accurate logical representations without artificial resource inflation. Option A is wrong because dummy activities have zero duration and consume no time. Option B is incorrect because they require no physical resources whatsoever. Option D is wrong because a dangling event represents an unconnected network error.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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