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H1126 Pages: 2

thrust chamber pressure=20 bar, Thrust 7 kN, determine the effective jet
velocity, actual jet velocity, specific impulse and SPC.

Explain the working of electric rocket propulsion system with neat sketch?
What are the advantages and disadvantage of solar rockets?

What are the various types of grain configurations used in rocket motors.

PART C
Answer any four full questions, each carries 10 marks.
Explain combustion instability in rocket engines? How can instabilities be
controlled?

Describe the combustion process in liquid and solid propellant rockets.

Explain the working of a hybrid rocket engine with a neat sketch

What are the precautions in handling liquid propellants?

What is meant by multi-staging of rocket vehicles? Write the equation for
maximum velocity increment a three-stage vehicle can attain in a gravity free
vacuum environment.

What are the different types of tests rocket propulsion systems are subjected to
before put into operational use?

Derive rocket equation for a rocket in gravity-free, drag-free flight.

A rocket has to deliver a payload of 1000 kg. The initial mass is 15000kg and
the structural mass is 3000kg.The exhaust velocity (VJ or Isp ge) is 3000m/s.
Find the Velocity increment (AV) required if

(i) itis a single stage (ii) it is a two stage with identical stages.

Compare the results and state which is better.

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