Is the UEM Kolkata or the ADAMAS good for ME, and which one of these universities has good placements?

From the options given above, none of them are good. UEM Kolkata does not have good management at all. You will not find any good labs here. As far as ADAMAS is concerned, there is not much information available about it but my friends have said that is not that good either.

My suggestion to you would be to opt for computer science at either of these colleges. This is because pursuing core streams from either of these colleges will be of no help to you at all. 

If you end up doing CSE, you can secure a job at a top MNC or IT firm. Due to the demand of CSE and IT graduates nowadays, there are more chances to get a job here, than in any core industry.

If you are looking for good labs at these colleges for core subjects, they will not be available to you. As a student, you will not be satisfied with this and the faculty is not that good either. You can opt for computer science engineering or eventually just go for Honors.