46) 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 Of these statement

47) A machine is purchased for Rs. 10,000,00/- and has an estimated life of 10 years. The salvage value at the end of 10 years is Rs. 1,50,000/-. The book value of the machine at the end of 5 years using general straight line method of evaluation of depreciation is

48) An excavator costs Rs. 20,00,000/- and has an estimated life of 8 years. It has no salvage value at the end of 8 years. The book value of the excavator at the end of 3 years using general double declining balance method is

49) If the excavation of earth is done manually then it costs Rs. 10 per cum. A machine can excavate at a fixed cost of Rs. 4000 plus a variable cost of Rs. 2 per cum. The quantity of earth for which the cost of excavation by machine will be equal to the cost of manual excavation is

50) Which one of the following surfaces will give highest coefficient of traction while using crawler track tractors