INS Chennai (D65) is the third of the Kolkata class Guided Missile Destroyer. How many types of weapons are there on INS Chennai so here you go:
A. BrahMos Anti-Ship Missiles :
INS Chennai features two bow-mounted 8-cell BrahMos UVLM installation and hence carries a total of 16 missiles for Anti-Ship Warfare. BrahMos AShM is a supersonic missile capable of delivering a 200 kg warhead at a speed of Mach 2.8.
B. AK-630 Close-In Weapon System :
It is a 30mm automatic rotary cannon used for a ship defense as last resort against Anti-Ship Missiles and can also be used against low flying aircrafts, helicopters, mines and small crafts. It can fire upto 5000 rounds per minute upto a range of 4000–5000 metres.
C. 76mm gun OTO Melara SRGM :
It can fire a 76×636mmR round to a distance of 16000 metres for HE-PFF round , 20000 metres for SAPOMER round and 40000 metres for 76 Vulcano round. This cannon is also used on various other Indian warships such as Brahmaputra-Class and Shivalik-Class.
D. Barak 8 Surface-to-Air Missiles :
It has four 8-cell Vertical Launching Systems for Barak 8 SAM thus making a total of 32 Barak 8 Missiles at total. Barak 8 is used to deal with Airborne threats like Fighter Aircrafts, AShM, Cruise Missiles and drones/helicopters. Possessing a range of upto 80–90 km it can engage targets in various threat envelopes.
E. Torpedo Tubes :
Four 533 mm torpedo tubes are present to launch torpedoes as an anti-submarine weapon.
F. RBU-6000 ASW Rockets :
These are used as an Anti-Submarine Weapon as it launches depth charges in quick salvos to defeat underwater targets upto a range of 6000 metres at maximum. It is an active deterrent against under-water targets which can be used to suppress them actively.