75) Consider the following features/factors :1.Projects are of the non-repetitive type.2.Time required need not be known.3.Time required is known precisely.4.Events have been established for planning.5.Emphasis is given to activities of project.PERT is preferred for planning because of

76) Consider the following activities in a building construction:1.Concreting of roof slabs2.Brick-jelly lime concrete terracing3.Erection of form work for slab4.Construction of parapet wall in terraceThe correct sequence of these activities is

77) Consider the following operations : 1.Drilling 2.Blasting 3.Mucking 4.Placing steel 5.Placing concrete. The correct sequence of these operations in tunnel construction is

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