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In a Trencher, a series of small cutting ____________ attached to two endless chains which are supported by a boom.

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In a Trencher,  a series of small cutting ____________ attached to two endless chains which are supported by a boom.

(a) Buckets

(b) Teeth

(c) Grader

(d) Cutter

I have been asked this question at a job interview.

My question is based upon Earth Compaction Equipments topic in portion Construction Equipments of Construction & Building Materials

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Correct choice is (a) Buckets

The best I can explain: A single machine can be used for digging trenches of various size by varying the length of the Boom. Some trenches have an angle of mould blade, which have to carry out the back filling operation.

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