Which of the following surfaces will give highest rolling resistance for a rubber tyred vehicle?

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A father notes that when his teenage daughter uses the telephone, she takes not less than 6 minutes for a call and som? times as much as an hour. Fifteen minutes call are more frequent than calls of any other duration. If these phone calls were an activity in PERT project, then phone calls expected duration will be_______________?

A. 15 minutes B. 20.143 minutes C. 21 minutes D. 27 minutes...

A wheeled tractor hauling unit is working on firm earth. The total loaded weight distribution of this unit is: Drive wheels : 25000 kg Scraper wheels : 10000 kg If the coefficient of traction for wheeled tractor on firm earth is 0.5, the rimpull which this tractor can exert without slipping is_______________?

A. 10000 kg B. 12500 kg C. 22500 kg D. 5000 kg...

Preliminary project report for a road project must contain___________________?

A. the detailed estimated cost based on detailed design B. the several alternatives of the project that have been considered C. the soil survey, traffic survey, concept design and approximate cost D. the contract documents for inviting tenders...

The grade resistance factor for an earth moving machine can be obtained by multiplying grade percentage by a factor approximately equal to_________________?

A. 2 kg/tonne B. 6 kg/tonne C. 9 kg/tonne D. 20 kg/tonne...

Free float for any activity is defined as the difference between__________________?

A. its earliest finish time and earliest start time for its successor activity B. its latest start time and earliest start time C. its latest finish time and earliest start time for its successor activity D. its earliest finish time and latest start time for its successor activity...