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

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

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