Q. Project 17A ships are described as having "Advanced Stealth Features." This is achieved through which of the following?

1. Use of Radar Absorbent Paint
2. Modification of the ship's superstructure shape to reduce Radar Cross Section (RCS)
3. Suppression of Infrared (heat) signatures from the engines
4. Reducing acoustic (noise) signatures through specialized hull design

Select the correct answer:
Answer: 1, 2, 3 and 4
Notes: The correct answer is [D] 1, 2, 3 and 4. Advanced stealth features in modern naval vessels like the Project 17A (Nilgiri-class) frigates are a multi-dimensional effort to minimize the ship's detectability across various physical domains.

• Modification of Shape (Statement 2 - Correct): This is the most visible stealth feature. The ship’s superstructure is designed with angled surfaces rather than vertical ones. These angles deflect incoming radar waves away from the source rather than reflecting them back, significantly reducing the Radar Cross Section (RCS).
• Radar Absorbent Paint (Statement 1 - Correct): The hull and superstructure are coated with specialized materials (RAM - Radar Absorbent Material) that absorb a portion of the electromagnetic energy from enemy radars instead of reflecting it.
• Infrared Suppression (Statement 3 - Correct): Engines generate immense heat. Project 17A uses advanced IR suppression systems to cool the exhaust gases before they leave the ship and masks hot engine parts, making it harder for heat-seeking missiles or infrared sensors to lock onto the vessel.
• Acoustic Signature Reduction (Statement 4 - Correct): To avoid detection by enemy submarines and sonar, the ships employ "quietening" technologies. This includes mounting machinery on noise-dampening cradles, using specialized propeller designs to prevent cavitation, and hull shaping to reduce water-flow noise.

Together, these technologies make the Project 17A frigates much harder to detect, track, and target compared to previous generations of warships.