Explanation :

• Imphal is the third ship to be launched under Project 15B (first was INS Vishakhapatnam & 2^nd was INS Mormugao).
• The warships built under the project are propelled by four gas turbines to achieve speed of 30 knots approximately.
• They have a length of 163 metres and 17.4 metres at the beam and a displacement of 7.300 tonnes.
• The ship was named in recognition of the Indian soldiers who fought in Battle of Imphal during World War II. It is the first Indian Navy ship named after a city in Northeast India.