81. In the construction of networks, dummy activities are introduced in order to

1. 1. Compute the slack on all events

   
   
   

   2. Transfer resources, if necessary, during monitoring

   
   
   

   3. Clearly designate a precedence relationship

   
   
   

   4. Simplify the crashing plan

   
   
   

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   NA

   Correct Option: C

   NA

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82. A project consists of six activities. The immediate predecessor of each activity and the estimated duration is also provided in the table below:
    
    If all activities other than S take the estimated amount of t i me, t he maxi mum dur at i on (in weeks) of the activity S without delaying the completion of the project is ______.

1. 1. 2

   
   
   

   2. 9

   
   
   

   3. 13

   
   
   

   4. 8

   
   
   

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1. View Hint View Answer Discuss in Forum

   

   Correct Option: A

   

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83. In PERT chart, the activity time distribution is

1. 1. Normal

   
   
   

   2. Binomial

   
   
   

   3. Poisson

   
   
   

   4. Beta

   
   
   

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1. View Hint View Answer Discuss in Forum

   Beta distribution extended to the Maximum & Minimum & gives strict definition for the mean & variance

   Correct Option: D

   Beta distribution extended to the Maximum & Minimum & gives strict definition for the mean & variance

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84. The standard deviation of the critical path is

1. 1. 0.33

   
   
   

   2. 0.55

   
   
   

   3. 0.88

   
   
   

   4. 1.66

   
   
   

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1. View Hint View Answer Discuss in Forum

   Variance =		tp − tO		2
   		6

   
   
   

   Total variance =		1		2	+		2		2	+		1		2	+		1		2
   		3					3					3					3

   
   

   =	7
   	9

   
   Standard deviation = √variance
   ⇒  √7/9 = 0.88

   Correct Option: C

   Variance =		tp − tO		2
   		6

   
   
   

   Total variance =		1		2	+		2		2	+		1		2	+		1		2
   		3					3					3					3

   
   

   =	7
   	9

   
   Standard deviation = √variance
   ⇒  √7/9 = 0.88

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85. The critical path duration of the network (in days) is

1. 1. 11

   
   
   

   2. 14

   
   
   

   3. 17

   
   
   

   4. 18

   
   
   

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1. View Hint View Answer Discuss in Forum

   
   EST = Earliest start time
   LFT = Latest Finish Time
   ∴  Path along which EST & LFT is equal are called critical path
   Critical path duration is 18 days.

   Correct Option: D

   
   EST = Earliest start time
   LFT = Latest Finish Time
   ∴  Path along which EST & LFT is equal are called critical path
   Critical path duration is 18 days.

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