hi,

ecet is the common entrance test for diploma holders for the admission in btech(lateral entry).according to your previous qualification and your expectation to join mechatronics enginnering you need to apply in MEC(meCHANICAL engineering). EEE and Ece are far away different from automobile engineering which you have studied in your diploma course. you will find many things common in mechanical department with automobile engineering . hope it helps.