JNTU
JNTU B.Tech III AEROSPACE PROPULSION- II Previous Question Paper (April - 2018 - R15)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
Define thrust specific fuel consumption in an air breathing engine.
Answer
Thrust specific fuel consumption (TSFC) is defined as the fuel mass flow rate required to produce a unit of thrust. It is expressed as the ratio of fuel mass flow rate to the net thrust produced by the engine.
Explain the differences between air breathing and rocket engines.
Answer
Air-breathing engines utilize atmospheric oxygen as the oxidizer for combustion, making them suitable for flight within the atmosphere. In contrast, rocket engines carry both fuel and an oxidizer on board, allowing them to operate in a vacuum or space environment where no atmospheric oxygen is available.
What is the role of the isolator in the scramjet engine?
Answer
Sign in to view the complete answer paper.
Explain the operating principle of a ramjet.
Answer
Sign in to view the complete answer paper.
Define specific impulse and total impulse for a rocket engine.
Answer
Sign in to view the complete answer paper.
Explain under expanded and over expanded nozzle flows.
Answer
Sign in to view the complete answer paper.
Define about bi-propellant and hyper cyclic propellants.
Answer
Sign in to view the complete answer paper.
Explain progressive, neutral and regressive burning with sketches of thrust versus time curves.
Answer
Sign in to view the complete answer paper.
List the three fundamental types of electric propulsion.
Answer
Sign in to view the complete answer paper.
Explain the principle of electromagnetic thrusters.
Answer
Sign in to view the complete answer paper.
Part B
Discuss the challenges involved in air-breathing propulsion to meet the requirements of hypersonic flight.
Answer
Sign in to view the complete answer paper.
Explain the need for reaction control systems in spacecraft and launch vehicles. Describe the functions of a reaction control system and also its major subsystems.
Answer
Sign in to view the complete answer paper.
Draw the sketch of a scramjet engine and explain its working.
Answer
Sign in to view the complete answer paper.
Discuss the advantages and disadvantages of scramjets.
Answer
Sign in to view the complete answer paper.
Describe liquid air cycle engine (LACE) with a schematic diagram and explain its operation. Discuss the advantages and disadvantages of LACE.
Answer
Sign in to view the complete answer paper.
Discuss the classification of rocket propulsion systems. Describe the applications of rocket propulsion in space launch vehicles and missiles.
Answer
Sign in to view the complete answer paper.
Explain the development of thrust in a rocket motor and derive thrust equation.
Answer
Sign in to view the complete answer paper.
A rocket engine has a propellant mass flow rate of 1000 kg/s and the specific impulse is 340 seconds. Calculate rocket thrust and effective exhaust velocity.
Answer
Sign in to view the complete answer paper.
Draw a neat diagram of a liquid propulsion system. Explain briefly its principal components along with their functions.
Answer
Sign in to view the complete answer paper.
Explain different grain configurations and type of solid propellants its working principle of a solid rocket motor with sketches.
Answer
Sign in to view the complete answer paper.
Discuss the operating principles, components and working of resistojet and arcjet electrothermal thrusters with schematic diagrams.
Answer
Sign in to view the complete answer paper.
Explain ion thruster with a schematic diagram and discuss its operation.
Answer
Sign in to view the complete answer paper.