Question

If a hammer is raised by steam and allowed to fall by gravity on top of the pile, it is called as________

(a) Diesel hammer

(b) Vibratory hammer

(c) Single acting hammer

(d) Drop hammer

The question was asked in an online quiz.

I would like to ask this question from Types of Piles topic in portion Pile Foundations of Geotechnical Engineering II

Answer 1

Correct choice is (c) Single acting hammer

To explain I would say: If a hammer is raised by steam, compressed air or internal combustion, but is allowed to fall by gravity alone, it is called as single acting hammer. The energy of such hammer is equal to the weight of the ram times the height of the fall.