The bearing value of the pressure pile can be increased by which of the following?

For completion of one under-ream, how many buckets of earth are required for removal?

Piles are commonly driven in to ground by means of special device called ______

Which of the following pile is used, when the ground is soft?

Enlarging the stem of bore hole at the depth is done by using________

Who was the first to develop a method for placing cast-in-situ concrete piles?

The elastic compression Δ L of a pile can be calculated by the expression based on _______

When a pile hammer hits the pile, the total driving energy is equal to _____