Hypersonic Technology and Advanced Aeronautics is part of Defence Technology. Below are notes on 10 sub-topics, followed by practice MCQs from State PSC and UPSC papers.
Advanced Stealth Technology and Radar Cross-Section Reduction
- A pylon is a pillar-like structure on an aircraft wing used for carrying an engine, weapon, or other load.
- Mirage 2000 is a single-engine fighter jet.
- HAL Tejas is a delta-winged fighter jet.
- Rafale is a supersonic (not hypersonic) fighter jet.
High-Altitude, Long-Endurance (HALE) Platforms and Pseudo-Satellites
- High-Altitude, Long-Endurance (HALE) Platforms and Pseudo-Satellites operate in the stratosphere (approx. 18-50 km altitude).
- These platforms provide persistent surveillance, communication relay, and other capabilities for extended durations.
- Combined Air Teaming System (CATS) is a technology integrating HALE/Pseudo-Satellite concepts with advanced aeronautics.
- CATS embodies a Manned-Unmanned Teaming (MUM-T) concept where a manned aircraft operates within a safe boundary.
- In CATS, unmanned aircraft (e.g., Loyal Wingman type) are designed to enter enemy zones.
- CATS Loyal Wingman type drones can strike targets directly at a distance of 700 kilometers.
- Alternatively, CATS Loyal Wingman type drones can go up to 350 kilometers, engage targets, and return.
- Hindustan Aeronautics Limited (HAL) is a key partner in developing the Combined Air Teaming System (CATS) technology.
- Defence Research and Development Organisation (DRDO) is developing a Stratospheric Airship Platform.
- The DRDO's Stratospheric Airship Platform is developed by the Aerial Delivery Research and Development Establishment (ADRDE), Agra.
- A maiden flight trial for DRDO's Stratospheric Airship Platform was reportedly carried out from Sheopur, Madhya Pradesh, on 3 May 2025.
Hypersonic Glide Vehicles (HGVs) and Hypersonic Cruise Missiles (HCMs)
- Kh-47M2 Kinzhal: Nuclear-capable hypersonic missile belonging to Russia.
Hypersonic Test and Evaluation Infrastructure (Wind Tunnels, Arc Jets)
- Indian Army's first Vertical Wind Tunnel (VWT) is located at the Special Forces Training School (SFTS), Bakloh, Himachal Pradesh.
Indian Hypersonic Technology Programs and Developments (e.g., HTDV)
- India's first Tejas squadron (No. 45 Squadron IAF "Flying Daggers") comprises 20 aircraft, with an additional 4 in reserve.
- India will manufacture Kamov 226T utility helicopters jointly with Russia under the 'Make in India' initiative, involving Hindustan Aeronautics Limited (HAL) and Russian Helicopters.
- RHUMI-1 is India's first reusable hybrid rocket, designed and launched by Space Kidz India.
Ramjet Engines
Air-breathing jet engine, no mechanical compressors or turbines; relies on aerodynamic ram compression. Requires initial high speed (e.g., rocket assist) to operate.
Combustion occurs at subsonic speeds after air is decelerated in the inlet diffuser. Efficient for supersonic flight (Mach 2-5).
(Mach 2-5).
- Scramjet Engines (Supersonic Combustion Ramjet) Advanced ramjet variant, no mechanical compressors or turbines; relies on aerodynamic ram compression. Distinctly,
combustion occurs at supersonic speeds. Enables operation at hypersonic speeds (Mach 5 and above).
- The primary difference between Ramjet and Scramjet is the combustion speed: Ramjet combustion is subsonic, while Scramjet combustion is supersonic.
- Neither Ramjet nor Scramjet engines utilize mechanical compressors or turbines; compression is solely achieved through the forward motion and inlet design.
- Hypersonic Technology heavily relies on these advanced propulsion systems (Ramjets, Scramjets) to achieve and sustain speeds beyond Mach 5.
- Combined Cycle Engines Integrate two or more different engine types (e.g., turbojet, ramjet, scramjet, rocket) to optimize propulsion efficiency across a wide range of flight speeds and altitudes, from takeoff to hypersonic flight.
- Examples of Combined Cycle Engines include Turbo-Ramjet (turbojet for low speed, ramjet for high speed) and Rocket-Based Combined Cycle (RBCC), which transitions from rocket to air-breathing modes.
Unmanned Combat Aerial Vehicles (UCAVs) and Autonomous Flight Systems
- Sarath (BMP-II) is an Infantry Fighting Vehicle (IFV), a land-based armored vehicle, not an aircraft.
9. Defence Electronics and Communication Systems
Practice MCQs: Hypersonic Technology and Advanced Aeronautics
Advanced Stealth Technology and Radar Cross-Section Reduction
A pillar like structure on the wing of an aircraft used for carrying an engine, weapon or other load is __________.
Asked in: GPSC Prelims CSP 2 2024
- Pylon
- Pilose
- Boot
- Cabin
Show answer
Answer: A. Pylon
Pylons are external structural attachments on aircraft for carrying engines or loads.
Consider the following statements: 1. Mirage 2000 is a twin-engine fighter jet. 2. HAL Tejas is a delta-winged fighter jet. 3. Rafale is a hypersonic fighter jet. Which of the statements given above is/are correct?
Asked in: UPSC CAPF 2022
- 1 and 2
- 2 only
- 1 and 3
- 3 only
Show answer
Answer: B. 2 only
Understanding the basic characteristics of prominent military aircraft, such as the number of engines, wing configuration (like delta wing), and speed category (supersonic, hypersonic), is important for current affairs and defence-related topics.
Which one of the following statements about F-18 Super Hornet is not correct?
Asked in: UPPCS Prelims 2005
- It is a fighter plane manufactured by U.S. Aerospace Company.
- It can be used both by a day and night.
- It is used by 8 countries of the world for their air force.
- HAL is manufacturing it with the assistance of Boeing Company.
Show answer
Answer: D. HAL is manufacturing it with the assistance of Boeing Company.
- The F/A-18 Super Hornet is a U.S.-made fighter jet. - It is capable of day and night operations. - HAL is an Indian aerospace company, not currently manufacturing the Super Hornet.
What is the colour of Black box, that is found in air- craft?
Asked in: UPPSC Upper Mains 2009
- Orange
- Red
- Blue
- Black
Show answer
Answer: A. Orange
Aircraft flight recorders, commonly but incorrectly referred to as "black boxes," are designed to be easily located after an accident.
High-Altitude, Long-Endurance (HALE) Platforms and Pseudo-Satellites
Which of the following statements is/are correct regarding Futuristic High Altitude Pseudo Satellite?
Asked in: GPSC Prelims CSP 2 2021
- 1, 2, 3 and 4
- 2, 3 and 4 only
- 1, 2 and 3 only
- 1 only
Show answer
Answer: A. 1, 2, 3 and 4
It is a first of its kind project, where a manned aircraft will operate within the boundary and the unmanned aircraft will enter the enemy zone It can straightway hit the target at a distance of 700 kilometres or can go upto 350 kilometres and come back This technology has been named Combined Air Teaming System (CATS). Hindustan Aeronautics Limited is a partner in developing this technology Statement 1: The Combined Air Teaming System (CATS), which includes a HAPS-like component (CATS Optimal), envisions a manned aircraft operating in safer zones while teaming with unmanned platforms (like CATS Warrior/Alpha) that can enter contested enemy airspace. This concept is core to the system. Statement 2: While HAPS itself is primarily for long-endurance surveillance/communication, the CATS project as a whole includes strike elements (like CATS Warrior/Hunter). The range mentioned (700km strike or 350km return) refers to the capabilities of the associated unmanned strike platforms within the CATS system, which is being discussed alongside HAPS. In the context of the overall project, this capability is relevant. Statement 3: The technology is indeed named Combined Air Teaming System (CATS). Statement 4: Hindustan Aeronautics Limited (HAL) is the lead partner in developing this technology, collaborating with other private firms.
Defence Research and Development Organisation conducted maiden flight trials of Stratospheric Airship Platform. In this context, consider the following statements and choose the correct option : Statement A : Its first flight trial was successfully carried out from Sheopur in Madhya Pradesh on 3 May, 2025. Statement B :
Asked in: Exam 2024 Group e 2024
- Both statements A and B are true.
- Only statement A is true.
- Only statement B is true.
- Both statements A and B are false.
Show answer
Answer: C. Only statement B is true.
It is developed by the Aerial Delivery Research and Development Establishment, Agra. Lecturer and Coach (School Edu. Dept.) Comp. Statement A contains incorrect geographical and location details for the flight trial. Statement B correctly identifies the developing agency, which is a known fact about DRDO's research establishments.
Hypersonic Glide Vehicles (HGVs) and Hypersonic Cruise Missiles (HCMs)
'The Kh-47M2 Kinzhal', a nuclear-capable hypersonic missile, belongs to which one of the following countries?
Asked in: UPSC CAPF 2022
- China
- France
- Russia
- USA
Show answer
Answer: C. Russia
The Kinzhal is part of Russia's suite of advanced weapons systems. Hypersonic missiles are a category of weapons capable of traveling at speeds exceeding Mach 5 (five times the speed of sound) and are difficult to intercept with current missile defence systems.
Hypersonic Test and Evaluation Infrastructure (Wind Tunnels, Arc Jets)
Where is the Indian Army's first Vertical Wind Tunnel (VWT) located?
Asked in: GPSC Prelims CSP 2 2024
- Jammu and Kashmir
- Uttarakhand
- Himachal Pradesh
- Arunachal Pradesh
Show answer
Answer: C. Himachal Pradesh
The Indian Army's first Vertical Wind Tunnel (VWT) has been established at the Special Forces Training School (SFTS) in Bakloh, Himachal Pradesh.
Indian Hypersonic Technology Programs and Developments (e.g., HTDV)
The first Tejas squadron of Indian Air Force consists of
Asked in: UPSC CDS 2 2016
- 20 aircrafts with 4 in reserve
- 100 aircrafts with 10 in reserve
- 20 aircrafts with no reserve
- 25 aircrafts with 5 in reserve
Show answer
Answer: C. 20 aircrafts with no reserve
The first squadron to be equipped with the LCA Tejas was the No. 45 Squadron, known as the 'Flying Daggers'. The planned and reported strength for this operational squadron upon full induction was 20 aircraft. While maintenance pools or fleet reserves exist at higher levels, the squadron's strength itself is typically cited as the number of operational aircraft.
India will manufacture Kamov 226 helicopter under 'Make in India' program jointly with
Asked in: GPSC Prelims CSP 2 2017
- France
- Russia
- USA
- Israel
Show answer
Answer: B. Russia
India and Russia have an inter-governmental agreement for the joint manufacturing of Kamov Ka-226T helicopters in India under the 'Make in India' initiative.
Which one of the following statements is correct regarding RHUMI-1? A) It is the first reusable hybrid rocket launched by India. B) It is India's first fast breeder nuclear reactor. C) It is the name of India's first indigenously built submarine. D) It is a lightweight tank designed and fabricated by DRDO for the Indian army.
Asked in: GS&EI ElectEngg 14 2024 1601 2025
- It is the first reusable hybrid rocket launched by India.
- It is India's first fast breeder nuclear reactor.
- It is the name of India's first indigenously built submarine.
- It is a lightweight tank designed and fabricated by DRDO for the Indian army.
Show answer
Answer: A. It is the first reusable hybrid rocket launched by India.
RHUMI-1 signifies a breakthrough in India's rocket technology, being the country's first reusable hybrid rocket. This technology has implications for cost- effective space missions.
Scramjet and Advanced Propulsion Systems (Ramjets, Combined Cycle Engines)
What is the difference between Ramjet and Scramjet engines used for propulsion?
Asked in: GPSC Prelims CSP 2 2022
- Ramjet engines use ram air while scramjet engines use oxygen.
- In ramjet engines combustion is at subsonic speeds while in scramjet it is at supersonic speeds.
- In ramjet engines compressors are used to compress the air to achieve desired speed unlike in scramjet engines.
- In scramjet engines turbines are used for increasing speeds, while there are no turbines in ramjet engines.
Show answer
Answer: B. In ramjet engines combustion is at subsonic speeds while in scramjet it is at supersonic speeds.
Both Ramjets and Scramjets are air-breathing jet engines that rely on forward motion to compress incoming air (ram effect). The key distinction lies in the speed at which the airflow passes through the combustion chamber. Ramjets slow the incoming supersonic air to subsonic speeds before combustion. Scramjets, designed for much higher flight speeds (hypersonic), allow the air to remain supersonic throughout the combustion process.
Unmanned Combat Aerial Vehicles (UCAVs) and Autonomous Flight Systems
Which one of the following is not an aircraft ?
Asked in: UPPSC Upper Mains 2009
- Jaguar
- Dornier-228
- Sarath (BMP-II)
- MIG-27M
Show answer
Answer: C. Sarath (BMP-II)
The question asks to identify which option is not an aircraft.
Recently the aircraft of Indian Air Force crashed near Bikaner after bird hit was - (1) Mirage 2000 - (2) MiG 21 - (3) Sukhoi 30 - (4) Boeing 737
Asked in: College Lecturer (Sarangi Instrument) 2018
- 1, 2 and 3
- 1, 3 and 4
- 2 and 4
- 1, 2, 3 and 4
Show answer
Answer: C. 2 and 4
This question relates to aviation incidents involving the Indian Air Force and civilian aircraft, testing knowledge of recent events and the types of aircraft involved.