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
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