78) For a given activity, the optimistic time, pessimistic time and the most probable estimates are 5, 17 and 8 days respectively, The expected time is

79) The maximum rimpull in the first gear of a tractor while towing a load is 6300 kg. The tractor weighs 12.5 tonnes and is operating along a 2 percent upgrade and the rolling resistance is 45 kg/tonne. Pull available for towing the load is

80) Grader is used mainly for

81) Which one of the following is not an excavating and moving type of equipment

82) The most suitable type of equipment for compaction of cohesive soils is