Q.

                                   type of excavator used for digging the foundation trenches below operating level.

A. clamshell
B. backactor
C. power shovel
D. skimmer
Answer» B. backactor
Explanation: back trench hoe excavator can also be used for the excavation of smaller areas such as basement, footing and trenches. the hoe is an instrument for scrapping, digging and losing the earth.
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