Construction Planning and Management
Wheeled tractors are replacing crawler tractors because 1. Wheeled tractors travel faster. 2. Crawler tractors are more expensive. 3. Track parts of a crawler wear out quickly. 4. Crawler tractors have stick control. of following statements

1, 2 and 4 are correct
2, 3 and 4 are correct
1, 3 and 4 are correct
1, 2 and 3 are correct

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Construction Planning and Management
Output of a bulldozer is(i) Increased if drawbar HP of the tractor is increased for a given hauling distance(ii) Decreased if drawbar HP of the tractor is increased for a given hauling distance(iii) Increased if the hauling distance is increased for a given drawbar HP of the tractor(iv) Decreased if the hauling distance is increased for a given drawbar HP of the tractor

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

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Construction Planning and Management
Pick up the correct statement from the following with regards to C.P.M. network analysis of projects

The latest occurrence time of the node of which the activity arrow terminates minus the duration of the activity, is called latest start time
Earliest occurrence time of the event from which the activity arrow' originates, is called earliest start time of the activity
All listed here
The latest occurrence time for the node at which the activity arrow terminates, is called latest finish time

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