Attempt this previous-year question. The correct option stays hidden until you choose.
Which of the following statements with regard to Black Boxes used in modern aircrafts is/are correct ?
1. They carry a beacon emitting red light pulses to facilitate underwater detection.
2. They record both the cockpit voice and flight data.
3. Their memory units are made using either stainless steel or titanium. Select the answer using the code given below :
Pick an option to check yourself.
Approach: *Understand the functional purpose and physical engineering of flight recorders (Black Boxes) to distinguish between their data-recording capabilities and their survival mechanisms.*
- **Correct Answer:** (b) 2 and 3 only
- **Statement 2 is correct:** A 'Black Box' consists of two main components: the Flight Data Recorder (FDR), which logs technical parameters (altitude, speed, etc.), and the Cockpit Voice Recorder (CVR), which captures audio from the flight deck.
- **Statement 3 is correct:** To survive extreme conditions—such as high-impact crashes, intense fire, and deep-sea pressure—the memory units are encased in highly durable materials like stainless steel or titanium, often lined with thermal insulation.
- **Statement 1 is incorrect:** Black Boxes do not emit red light pulses. Instead, they are equipped with an Underwater Locator Beacon (ULB) that emits **ultrasonic acoustic pulses** (pings) at a frequency of 37.5 kHz, which can be detected by sonar equipment underwater. The boxes themselves are painted bright orange (not black) to aid in visual recovery.
Attempt Prelims MCQs or open Mains questions by paper — then continue the same bank inside the app with visual decks.
GyanGram