Q.

                                   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
Answer» C. clamshell
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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