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04000ME462052001

Pages: 2

Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Eighth semester B.Tech degree examinations, September 2020

Course Code: ME462
Course Name: Propulsion Engineering

PARTA

Answer any three full questions, each carries 10 marks.
Explain the working of turbofan engine with a neat sketch
Which are the advantages of turbo-prop Engine
Derive the expression with a neat sketch for the jet thrust of turbojet engine
What is mean by effective jet velocity?
Distinguish between the Air breathing engines with non breathing Engines.
Give some examples.
Explain the working principle of Propellers and Jet engines.
An aircraft flies at a speed of 925 kmph. A turbojet engine takes 35kg/s of air
and the gases are expanded to ambient pressure .The air fuel ratio is 50 and the
lower calorific value of the fuel is 43MJ/kg. For the maximum thrust power,
Determine (a) Jet velocity (b) Thrust (c) Specific Thrust (d) Thrust power
(e) Propulsive efficiency (f) Thermal efficiency (g) Overall efficiency

PART B

Answer any three full questions, each carries 10 marks.
Which are the components of Turbojet Engine? Explain their functions
Which compressor is used for high speed high range aircraft engines? Why
Explain the different Thrust augmentation methods.
Classify the types of air intakes? How the air intakes works?
Explain about the working of nuclear rocket with a neat sketch.
What are the factors affecting the linear burning rate in solid propellant rocket.
A rocket has the following data: fuel flow rate is 3.5kg/s, oxidiser flow rate is
1.2kg/s, Nozzle exit diameter is 120mm, Nozzle exit pressure 15 1.03bar,
ambient pressure is 1.013 bar, Thrust chamber pressure is 25 bar and Thrust is
6000N. Determine i) Effective jet velocity ii) Actual jet velocity iii) Specific

impulse and specific propellant consumption

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Duration: 3 Hours

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