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_________________ type of excavator is used for digging below, at or above operating level in a vertical range.

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_________________ type of excavator is used for digging below, at or above operating level in a vertical range.

(a) Skimmer

(b) Dragline

(c) Clamshell

(d) Back trench

I have been asked this question in a job interview.

I want to ask this question from Excavating Equipments in chapter Construction Equipments of Construction & Building Materials

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Correct option is (c) Clamshell

Best explanation: The Clamshell excavator are widely used for rehandling of material and for working in Limited space as in case of foundation trenches for pipelines, etc. It is also used for jobs that require fairly accurate dumping and disposal of material.

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