Diploma

I can suggest a college for Diploma in electrical engineering which is JAIPUR NATIONAL UNIVERSITY. The objective of the Diploma courses is to provide a comprehensive understanding of various aspects of Electrical engineering and skills development in Circuit Designing, Micro controlling, Control System, Robotics, Operating Electrical Machines, and Power Systems. Duration: 3 Years
Eligibility: Min. 10th Pass with 50%
Selection Procedure: Merit + P. I. Visit: https://www.jnujaipur.ac.in/courses/diploma-in-electrical-engineering/63/.

Yes, you can get admission in Delhi University without giving any entrance exam.
They directly give admission on the basis of marks you scored in 12th standard.

Hello Harshada,
Refer https://www.shiksha.com/exams/ies for IES Eligibility 2020: Age Limit, Minimum Qualification and Reservation Criteria.

You have to complete it first and then apply for the same.

It depends upon the institute you have chosen for the same. If they ask for the entrance then you have to give that.

This depends upon the Diploma but the value of a degree and Diploma is different.

Just consult the concerned authority.