Construction Planning and Management
If the excavation of earth is done manually then it costs Rs. 10 per cum. A machine can excavate at a fixed cost of Rs. 4000 plus a variable cost of Rs. 2 per cum. The quantity of earth for which the cost of excavation by machine will be equal to the cost of manual excavation is

1000 cum
1500 cum
500 cum
2000 cum

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

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Construction Planning and Management
In time-cost optimization of a project, crashing is done.

On all the activities lying on the critical path
On original critical activities and those that become critical at any stage of crashing in the order of ascending cost slope
Only on activities lying on the original critical path and having flatter cost slopes
On all the activities

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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.

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

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