AE6504 Propulsion -II
Third year, Department of Aeronautical Engineering
First and second Units Questions.
PART A (20 Marks)
1.      Compare air breathing engine and Rocket engine.
2.      Describe three important application of rocket propulsion.
3.      Define propellant area ratio and linear burning rate.
4.       Difference between diergols and hypergols.give two examples for each.
5.      Difference between earth storable and cryogenic propellant.
6.      Define specific impulse and total impulse
7.      Define deflagration limit?
8.      Define ignition delay and decay time of rocket engine. ?
9.      What is mixture ratio and stoichiometric MR.
10.  Define inhibitor and insulator
PART B  (80 Marks )
1.      a)  Explain with sketch the working of solid rocket motor. Also  write the  advantage and disadvantages
(OR)
b) Classify the rockets and explain each system briefly.

2.      a) Draw 5 major grain structures and give propellant grain design considerations.
(OR)
b) Explain with sketch the progressive, regressive and neutral burning?

3.      a) Explain the working of pressure feed system of liquid engine with sketch. Also  give its merits and demerits
(OR)
b) Explain working of liquid mono propellant system with sketch. Also give its merits and demerits 
4.      a) Explain with sketch the working of pump feed system of liquid rocket engine. Give its merits and demerits
(OR)
b) Explain with sketch the 5 types of cooling employed    for liquid engines.

5.      a) Linear burning rate of solid propellant restricted burning  grain is 30mm/sec when chamber pressure is 70bar and 50 mm/sec when chamber pressure is 200bar .calculate ,
·         Pc  that gives a burning rate of 40mm/sec,
·         Propellant  consumption  rate if density is 175 kg/ and grain diameter 190 mm and pc is      90 bar 
(OR)
b) Explain the following term
·         Characteristic velocity
·         ISP range of solid ,liquid &hybrid
·         Factors affecting thrust
·         Mass ratio and mass fraction