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

21 minutes
27 minutes
20.143 minutes
15 minutes

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

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Construction Planning and Management
Batching refers to

Adjusting the water to be added in each batch according to the moisture content of the materials being mixed in the batch
Controlling the quantity of each material into each batch
Controlling the total quantity at each batch
Weighing accurately, the quantity of each material for a job before mixing

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