I am asked to prepare a model of beam supported with rollers and hinges. Plz sugget me which type of roller roller i should use and also hinge.

Dear Mohit,

 the hinge prevents translation in all directions, the roller only in one direction. Additionally, you should note that there is zero moment reaction at these supports - rotation is not restricted.

As for visualizing it:

A hinge can best be visualized by, a hinge. Imagine a horizontal door, a hinge support in a model acts just like a real life hinge. 

For a roller, picture a beam sitting on a cylinder. Nothing to connect them together other than gravity. If the beam were to move sideways (for example, expand with a temperature increase), the roller would just roll, allowing the beam to move. Some of the small bridges you drive across actually use this as a support, a steel cylinderunder each beam, sitting on a steel plate.

Best Of luck

Cracking IIT just got more exciting,It s not just all about getting assistance from IITians, alongside Target Achievement and Rewards play an important role. ASKIITIANS has it all for you, wherein you get assistance only from IITians for your preparation and win by answering queries in the discussion forums. Reward points 5 + 15 for all those who upload their pic and download the ASKIITIANS Toolbar, just a simple  to download the toolbar….

So start the brain storming…. become a leader with Elite Expert League ASKIITIANS

Thanks

Aman Bansal

Askiitian Expert