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

20.143 minutes
21 minutes
27 minutes
15 minutes

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Construction Planning and Management
If the optimistic time, most likely time and pessimistic time for activity A are 4, 6 and 8 respectively and for activity B are 5, 5.5 and 9 respectively, then

expected time of activity B is greater than the expected time of activity A
expected time of activity A is greater than the expected time of activity B
expected time of both activities A and B are same
None of these

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Construction Planning and Management
Consider the following statements for a power shovel: (i) Output can be increased by reducing the angle of swing for a given depth of cut. (ii) For a given angle of swing, output will be maximum at optimum depth of cut. (iii) Output can be increased by keeping the depth of cut less than optimum depth. (iv) Output can be increased by increasing the size of shovel.

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

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