I find both Delhi Technological University (DTU) and Indian Institute of Technology Delhi (IIT Delhi) are good institutes.

Delhi Technological University

Delhi Technological University (DTU) is a premier government university and is one of the oldest engineering colleges in India and Delhi's first engineering college. It was established in 1941 as Delhi Polytechnic and was under the control of the Government of India.

Ranking

DTU is consistently ranked as one of the top engineering colleges in India. It has been rated AAAA+ by Careers 360 (Magazine) Top Engineering Colleges in India 2015.

DTU has been ranked as the 12th best Engineering College of India in the Edu-Rand Rankings of 2015. The survey was done jointly by Edu, an Indian company and Rand Corporation, a non-profit American thinktank.

Notable Alumni
Vinod Dham: (Electrical Engg) Popularly known as the Father of the Pentium chip[46] led the Pentium project at Intel.
Vijay Shekhar Sharma : Founder Paytm
Praveen Sinha : Co-Founder Jabong.com
Ravi Grover: Director, Homi Bhabha National Institute. Ex- principal Adviser to Dept. of Atomic Energy, India. Responsible for the successful negotiations in the 2007 Indo-US nuclear deal
Durjoy Datta: Bestselling author
Raghbir Singh Bhola: Arjuna Award winner, Olympian.
Sachin Garg : Author
Subhav Sinha : Inventor
Niketan Madhok : Supermodel
Manish Khera : former CEO, Airtel Money, selected the Young Global Leader 2011, by the World Economic Forum
Sushant Singh Rajput: Bollywood Actor
Rajinder Kumar, chemical engineer, Padma Bhushan recipient

Indian Institute of Technology Delhi

The Indian Institute of Technology Delhi is a public research university declared to be Institute of National Importance by Government of India under Institutes of Technology Act.

It is one of the two educational institutes in India which have been listed in Quacquarelli Symonds’ (QS) list of top 200 universities globally in 2015.

Ranking

Internationally, IIT Delhi was ranked #185 in the QS World University Rankings in 2016 and at 38 in the QS Asian Rankings of 2014. IIT Delhi has responded to being ranked 176 on the QS Worldwide University Rankings, with an appeal for more "investment in - and support for - the faculty."

In 2014, the University ranked 4th in top higher education institutions in India, 59th in top 100 higher education Institutes in Asia. In 2016, it has been ranked 5 in Careers360 Top Universities in India 2016 and ranks at 56th in BRICS and Emerging Economies by the Times Higher Education World University Rankings

In India, among engineering colleges, it ranked first by India Today in 2013, first by Outlook India in 2013, and third by Dataquest in 2011. In the Mint Government Colleges survey of 2009 it ranked 3.

Notable Alumni
Avinash Kumar Agarwal, mechanical engineer, Shanti Swarup Bhatnagar laureate
Soumitro Banerjee, electrical engineer, Shanti Swarup Bhatnagar laureate
Manvinder Singh Banga, Former Chairman, Unilever
Binny Bansal, Co-founder of Flipkart
Sachin Bansal, Founder of Flipkart
Swami Mukundananda,Spiritual Teacher
Kiran Bedi, first female IPS officer of India
Chetan Bhagat, Indian novelist
Vikrant Bhargava, Co-founder, Partygaming
Somnath Bharti, Lawyer and politician
Yogesh Chander Deveshwar, Chairman at ITC
Anurag Dikshit, Co-founder, Partygaming
Sameer Gehlaut, Co-founder of Indiabulls
Rajdeep Grewal, Distinguished Professor of Marketing at University of North Carolina at Chapel Hill
Rajat Gupta, first Indian-born CEO of a global corporation, served as Managing Director of McKinsey & Company
Avinash Kak, Professor of Electrical and Computer Engineering at Purdue University
Subhash Kak, Professor of Electrical and Computer Engineering at Oklahoma State University
Devang Vipin Khakhar - chemical engineer, academic, Shanti Swarup Bhatnagar laureate
Vinod Khosla, one of the co-founders of Sun Microsystems, where he served as its first CEO & Chairman in the early 1980s
Shrinivas Kulkarni, McArthur Professor of Astronomy and Planetary Science, Caltech
Shashank Kumar, Founder & CEO, Green Agrevolution and Founder, Farms and Farmers
Pramod Maheshwari Chief Executive Officer, Career Point Ltd
Ashish Nanda, Director at Indian Institute of Management Ahmedabad & Robert Braucher Professor of Practice at Harvard Law School
Venkata Padmanabhan, computer engineer, Shanti Swarup Bhatnagar laureate
Rajendra Pawar, co-founder, NIIT
Arogyaswami Paulraj, pioneer in MIMO, Professor Emeritus in the Dept. of Elect. Engineering at Stanford University
Surendra Prasad, communications engineer, Shanti Swarup Bhatnagar laureate
Tushar Raheja, Indian novelist
Raghuram Rajan, Chief Economic Adviser to the Prime Minister of India and Eric Glecher at ChicagoBooth; 23rd governor of the Reserve Bank of India joined on 05 Sep 2013
Sashi Reddi (serial entrepreneur, venture capitalist, angel investor, a technologist and a philanthropist)
Krishan Sabnani, Alcatel-Lucent Bell Labs Research VP responsible for research on NFV and web communications
Subir Sachdev, Professor of Physics at Harvard University, USA.
Rama Gopal Sarepaka, Retd. Scientist, CSIR-CSIO, Precision Machining-Single Point Diamond Turning and Characterization
Anurag Sharma - optical physicist, academic, Shanti Swarup Bhatnagar laureate
Jayant Sinha, Union Minister of State for Finance, Government of India, former Managing Director at Omidyar Network and Partner at McKinsey & Company, Member of Parliament in the Indian Lok Sabha
Vijay Thadani, co-founder, NIIT
Ajay Trehan, Founder & CEO, AuthBridge
Padmasree Warrior, Chief Technology & Strategy Officer Cisco Systems and Former Chief Technology Officer of Motorola, Inc
Deepinder Goyal, Founder and CEO, Zomato
Rohit Kapoor, Founder, Vice Chairman and CEO of Exl Service