Question

When the bridges are extended over long routes or distance then _________

(a) A rocker or a roller is used at the joints

(b) They are not extended to such a long distance

(c) The bridges are painted

(d) The roads are made narrow

This question was addressed to me during an interview.

I'm obligated to ask this question of Simple Trusses topic in portion Structural Analysis of Engineering Mechanics

Answer 1

Right answer is (a) A rocker or a roller is used at the joints

The explanation: When the bridges are extended over long routes or distance then a rocker or a roller is used at the joints. This allows the bridge joints to move around. That is when the temperature is raised. The elongations and the contractions of the joints part are not much affected if the rollers and rockers are used.