One of my friends graduated from ISI, Delhi Campus. So I might be able to give you some information about it.

• For the Kolkata and Delhi campuses, I don’t believe there are separate MSQE exams. 
• When filling out the application, you must choose between Kolkata and Delhi.
• If nothing has changed since 2009, which I assume it has, you will only have to take one exam and select your campus on the application form.

However, in Delhi and Kolkata, interviews are performed at the relevant locations. That is, students who are chosen in a Delhi interview are admitted to ISI Delhi, and vice versa.