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_________________ is a self propelled machine which is used mainly to exert a powerful tractive force for pulling other machines.

(a) Bulldozer

(b) Crane

(c) Dumper

(d) Tractor

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I would like to ask this question from Hoisting Equipments topic in portion Construction Equipments of Construction & Building Materials

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Correct choice is (d) Tractor

To elaborate: The tractors are used for agricultural operations such as hoeing, tilling, harvesting, etc. When tractors are equipped with shovels, they can be used for the mining operations. The tractors maybe crawler mounted or wheel mounted.

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