Hey as per your demand here I am providing you details of Tank x in DRDO
About Tank x
Tank Ex, or MBT Ex, was the code name of the main battle tank developed by the Indian Defence Research and Development Organisation (DRDO) in 2002.
It was rumoured the tank would be called Karna, after one of the heroes of the Indian epic The Mahabharata

Utilization
The Tank Ex utilizes the Arjun MBT's 120 mm rifled gun firing unitary APFSDS and HESH semi combustible cartridge case ammunition
A total of 32 rounds are carried, as compared with 39 in the Arjun and 45 two piece rounds in the T-72
A global positioning system is provided for accurate navigation
This is a feature common to both the Arjun MBT and the Combat Improved Ajeya.

Developed by
Tank Ex was developed as a second attempt after the development of the Ajeya (an upgraded T-72) by DRDO in order to capitalize on the technology developed for that project.
It underwent six months of trials, but was subsequently rejected by the Indian Army.
At least two Tank Ex prototypes were built

Specifications
Weighing in at 47 tons, the Tank Ex is heavier than the T-72M1 (41 tons) and much lighter than the Arjun MBT, (58.4 tons).
It has a 1,000 hp (700 kW) power plant giving a power-to-weight ratio of 21 hp (16 kW)/ton for a total weight of 47 tons.
This represents an improvement over the T-72M1's 20 hp (15 kW)/ton, with a weight of 41 tons and a 780 hp (582 kW) power plant.