Construction Planning and Management
Wheeled tractors are replacing crawler tractors because1. 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
1, 3 and 4 are correct
2, 3 and 4 are correct
1, 2 and 3 are correct

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Construction Planning and Management
At a work site, statistical quality control of concrete means

Reduction in wastage of inspection costs
Reduction in costs for the removal of defects
Measurement of risks to eliminate failures
Applying the theory' of probability to sample testing or inspection

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

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