Construction Planning and Management
A father notes that when his teenage daughter uses the telephone, she takes not less than 6 minutes for a call and som? times as much as an hour. Fifteen minutes call are more frequent than calls of any other duration. If these phone calls were an activity in PERT project, then phone calls expected duration will be

27 minutes
20.143 minutes
21 minutes
15 minutes

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Construction Planning and Management
Output of a bulldozer is (i) Increased if drawbar HP of the tractor is increased for a given hauling distance (ii) Decreased if drawbar HP of the tractor is increased for a given hauling distance (iii) Increased if the hauling distance is increased for a given drawbar HP of the tractor (iv) Decreased if the hauling distance is increased for a given drawbar HP of the tractor

(ii) and (iii) are correct
(ii) and (iv) are correct
(i) and (iii) are correct
(i) and (iv) are correct

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Construction Planning and Management
Earliest finish of an activity is always

Less than or equal to earliest event time of the following node
Less than earliest event time of the following node
Greater than or equal to earliest event time of the following node
Greater than earliest event time of the following node

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Construction Planning and Management
Free float for any activity is defined as the difference between

its earliest finish time and latest start time for its successor activity
its earliest finish time and earliest start time for its successor activity
its latest start time and earliest start time
its latest finish time and earliest start time for its successor activity

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