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Reg No.:_ Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
EIGHTH SEMESTER B.TECH DEGREE EXAMINATION, MAY 2019

Course Code: ME462
Course Name: Propulsion Engineering

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 (a) Explain the working of pulsejet engines (7)
(b) Why the use of pulsejet engines is restricted to pilot less aircrafts (3)
2 (४) Explain the working of a turbofan engine (7)
(b) How turbofan engine is different from turbojet engine (3)

3 (a) Ona 1-5 diagram draw the various processes occurring in a turbojet engine. (7)
Draw both ideal and actual processes.
(b) The isentropic efficiency of a turbine is more than that of a compressor. (3)
Substantiate this statement.
4 A turbojet engine takes in 30 kg/s of air and expands the gases through the jet (10)
nozzle. The pressure of the gas leaving the nozzle is equal to ambient pressure.
The fuel air ratio is 0.012 and flight velocity is 800 km/hr. For maximum thrust
power determine (1) thrust (ii) thrust power (111) TSFC (iv) propulsive efficiency
(v) thermal efficiency
PART ‏تا‎
‎Answer any three full questions, each carries 10 marks.
5 (a) What are the thrust augmentation methods used in turbojet engines? Which (7)
method is preferred for the long-range operations of turbojet engine
(b) Explain the difference between the impulse turbine and reaction turbine (3)
6 (a) Which type of compressor is preferred for the aircraft gas turbine engine? Why? (4)
(b) Explain the types of combustion chambers used in a turbojet engine with neat (6)
sketches
7 (a) Explain the working of hybrid rocket propulsion system? What are the (4)
advantages of hybrid rocket propulsion system?
(b) A rocket has the following data: Propellant flow rate=0.5 kg/sec, Nozzle exit (6)

diameter=10 cm, Nozzle exit pressure=1.02 bar, Ambient pressure=1.013 bar,

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