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An _______________ is an oldest type of machine which removes earth.(a) Escalator(b) Excavator(c) Elevator(d) BulldozerI have been asked this question by my school principal while I was bunking the class.The origin of the question is Excavating Equipments in division Construction Equipments of Construction & Building Materials

Answer» CORRECT answer is (b) Excavator

Easy explanation: Excavator PERFORMS it work of MOVING the earth while the main unit is stationary. The title effort is required to move the dead weight of earth in a vertical PLANE.


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