Polytechnic

Yes, you are eligible. You need to participate in Common Entrance Test (CET) conducted by DTU. The eligibility criteria is Diploma in engineering with 60% of marks. However, there are very few seats available in DTU for outside students, so you may not get your preferred branch.

JB, This program is not available at G.H. Raisoni Polytechnic, Nagpur. However Diploma in Fire engineering full-time course of 2-years of duration is available here.

No, because you need to complete 12th for that which you have not pursued in your education.

Hi,
Yes, you can apply. Can't say if you will be accepted since it is up to the college but your profile seems competitive enough. See their admission portal and follow the procedures and deadlines.

No, it doesn't. Courses offered by this institute are mentioned on this link https://www.shiksha.com/college/wisdom-school-of-management-darya-ganj-darya-ganj-delhi-35124/courses?ct[]=74&lo[]=773

Check out the official link below for details:
http://www.pcpolytechnic.com/admission-procedure.html
http://www.pcpolytechnic.com/admission-process.html

King India's Book will help you clear Polytechnic and entrance exam also. My preference is to read NCERT books.

Hello Adarsh Upadhyay, Polytechnic is a term that is normally reserved for a college or an institution which imparts training for teaching to students who have taken admission for becoming Diploma holders in engineering. Now a days many state governments conduct an entrance exam for screening students who have passed 10th examination for giving admission based on merit in this entrance exam which is sometimes called as Polytechnic entrance exam. Best wishes to you.

Admission is through Centralized Admission Process of Maharashtra based on marks obtained in class 10th, there is some percentage of All India Quota for admission apart from state quota, you can get admission through it.

Yes, you can join B.Tech electrical engineering after polytechnic/Diploma, but the admission will be through WBJEE.