Automatic Sevai and Combo Machine

For Sevai the dough is made of boiled rice. whereas  for Idiyappam the dough is  made of raw rice powder. 

In Sevai, the boiled rice will be ground and the batter made into idly, then it can be pressed by the machine. The output is ready to serve. In Idiyappam, the raw rice powder is mixed with hot water to make dough  and then pressed by the machine into  strings to make a round shape which is then steamed before serving. 

Yes ! There is a combo machine for Idiyappam and sevai

No. Sevai and vermicelli are different food. This machine can press only hot idly to make sevai

Most certainly YES!  One  can easily operate the machine without much effort just by using one Switch. It does not require any maintenance.