UPSC Civil Service Exam Questions - Engineering

Q1:

Negative skin friction on a pile under vertical compressive load acts

A downwards and increases the load carrying capacity of the pile

B downwards and reduces the load carrying capacity of the pile

C upwards and increases the load carrying capacity of the pile

D downwards and maintains the same load carrying capacity of the pile

ANS:B - downwards and reduces the load carrying capacity of the pile

Negative skin friction is to be considered when fill settles relative to pile.