Construction Planning and Management
A tractor whose weight is 20 tonnes has a drawbar pull of 2500 kg, when operated on a level road having a rolling resistance of 30 kg per tonne. If this tractor is operated on a level road having a rolling resistance of 40 kg per tonne, then the drawbar pull of the tractor will

Increase by 250 kg
Increase by 200 kg
Reduce by 200 kg
Reduce by 250 kg

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

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

On all the activities
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

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