Hello Ansari,

Some of the best institute for diploma in mechanical engineering are listed below

• Veermata Jijabai Technological Institute, Mumbai
• MIT Works Peace University, Pune
• Aalim Muhammed Salegh, Chennai
• Abdul Kalam Institute of Technological Sciences, Andhra Pradesh
• Abha Gaikwad-Patil College of Engineering, Nagpur

Hello, 

There are number of Institutes which provide diploma in Mechanical Engineering, you haven't specified you're seeking admission in which place, so kindly mention that for more detailed answer. 

Anyway, I've listed some below-

• Veermata Jijabai Technological Institute (VJTI) Mumbai, Maharashtra
• Lovely Professional University (LPU) , Jalandhar
• Aligarh Muslim University- Aligarh, Uttar Pradesh
• Galgotias University (GU), Greater Noida

Thank you!