13
14

a)

b)

04000ME462052001

PART (^

Answer any four full questions, each carries 10 marks.
Explain the combustion instability in rocket engines? How it can be controlled
Explain the working of propellant feed systems in liquid propellant rocket
Which are the types of injectors used in liquid propellant rockets.
Which are the test to be conducted for the rocket components before they put
into operation?
Describe about the flight testing.
Derive the rocket equation in Gravity free Drag free flight.
A two stage rocket is used to pull up a payload of 500kg mass in a particular
orbit. The approximate value of the mass of propellant, mass structure and jet

velocity for each stage is given below.

Mass of propellant(kg)

Mass of structure including | 2500
inerts(kg)

Jet velocity(m/s) 1750 2000

Determine: 2) Payload mass fraction of the total rocket ii) ideal change in
velocity provided by each stage and the total velocity iii)If the first stage fires
for period of 60 sec and the rate of mass depletion assumed to be constant find

the acceleration of the rocket at take-off.

Page 2of 2

(10)
(10)
(10)
(5)

(5)
(10)
(10)