In PERT analysis, a critical activity has:

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  1. Maximum float
  2. Zero float
  3. Maximum cost
  4. ​Minimum cost

Answer (Detailed Solution Below)

Option 2 : Zero float

Detailed Solution

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Explanation: 

Critical activity:

Critical activities are those activities whose float is zero and they lie on the critical path.

Float:

Relax or delay provided to any activity is known as float.

Floats are of three types. They are as follows:

F1 Ashiq 21.9.20 Pallavi D18

Total Float (TF):

The maximum delay or relax provided to any activity without affecting the project duration.

TF = Lj – Ei – dij

Free Float (FF):

Relax or delay provided to any activity without affecting the Earliest Start Time (EST) of the successor activity.

FF = Ej – Ei – dij

Independent Float:

Relax or delay provided to any activity without affecting the Earliest Start Time (EST) of successor activity as well as Latest Finish Time (LFT) of the predecessor activity.

IF = Ej – Li - dij

Relation among float TF ≥ FF ≥ IF

Important Points

Critical Path:

  • The longest path in the network diagram is called Critical Path.
  • The length of the Critical Path determines the minimum duration required for the completion of the project.
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