Rr322106-rockets-and-missiles

Set No. 1

Code No: RR322106

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 ROCKETS AND MISSILES (Aeronautical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Explain the working of turbine feed system for liquid propellant rocket motor. Describe the various components used in this system. [16] 2. What do you understand by burning rate of solid propellant? Explain the various factors affecting the burning rate in a full-scale rocket motor. [16] 3. A surface to surface missile achieves a velocity of Vb at an altitude of hb with the flight path of angle Υb . Obtain an expression for the range covered by the missile. State assumptions if any. [16] 4. (a) What is the effect of body up wash on the aerodynamic characteristics of a missile with forward control? (b) Write a note on the roll resonance and roll lock in.

[10+6]

5. (a) Derive the relation between the time and flight path angle for the gravity turn trajectory of a rocket with constant specific thrust. (b) Define kick angle, vertical rise time and velocity factor.

[10+6]

6. Explain the method of controlling the magnitude of the thrust in solid propellant rockets. What is the disadvantage of varying throat area? [16] 7. Describe the factors responsible for rocket dispersion and various methods to check this dispersion. How the effect of thrust misalignment be minimized? [16] 8. What do you mean by thermal protection system? Which types of thermal protection system are used in rockets and missiles? Describe a thermal protection system based on heat absorption. [16] ⋆⋆⋆⋆⋆

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Set No. 2

Code No: RR322106

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 ROCKETS AND MISSILES (Aeronautical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Sketch a layout of a liquid propellant rocket and show the fuel pump, igniters and feed lines on it, what is the effect of the injector on the performance of the rocket engine. [16] 2. Which are the airframe components of a missile; explain the different types of fore-bodies? [16] 3. (a) Calculate the turn radius and change in the flight path angle for pull up maneuver of a missile. (b) What is boost sustain trajectory? How would find range and flight time of such a trajectory. [8+8] 4. Write the equation for the dynamic longitudinal stability of a missile and by drawing a sketch, show the induced aerodynamic forces due to pitching motion. [16] 5. Prove that the maximum distance is given by the following equation for a rocket with vertical flight in friction less air.  −   2 Vj2 1 (1−m/M0 )+In(m/M0 ) m [16] Zmax = − g 2 In M0 + a0 /g+1 6. Define ideal burnout velocity of a rocket. How does it depend upon mass ratio and effective jet velocity of the rocket? Draw curves showing the effect of mass ratio and effective jet velocity on the ideal burn out velocity. [16] 7. For an ideal multistage launch vehicle with several stages discuss the effect on the ideal mission velocity if the 2nd and 3rd stages are not started immediately but are allowed to coast for a short period after shutoff and separation of prior stage before staring of next stage. [16] 8. What properties the material of high pressure vessel should posses? Discuss the suitability of titanium, steel and aluminium alloys for fabricating the motor case of rockets. [16] ⋆⋆⋆⋆⋆

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Set No. 3

Code No: RR322106

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 ROCKETS AND MISSILES (Aeronautical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What is a squib or primer; describe different types of primers used in the rockets. (b) What is the effect of motor free volume on the igniter charge?

[10+6]

2. (a) Explain the different types of control surfaces in missiles. (b) How does a missile differ from a rocket? (c) What are the characteristics of bodies of revolution.

[6+5+5]

3. (a) What are the various sub systems of a missile? Discuss each of them in brief. (b) How does a missile differ from a rocket?

[8+8]

4. (a) Analyze the longitudinal dynamics of a missile by using two degrees of freedom model and state how the various aerodynamic derivatives affect the dynamics of a missile. (b) Why cruciform missiles are roll stabilized?

[12+4]

5. What are the various types of trajectories followed by the missiles; explain the methods to calculate the Boost-Sustain trajectory. [16] 6. What do you mean by thrust vector control? Explain various methods of thrust vector control in the liquid propellant rockets? [16] 7. (a) What is rocket dispersion? What are the various factors responsible for it? Describe the methods for correcting the path of a rocket after dispersion. (b) A four stage rocket is fired with an initial velocity ‘V’. Find the velocity at the end of burnout of the rocket and maximum altitude attained. [10+6] 8. What are the factors responsible for heating the structure of rockets and missiles? [16] ⋆⋆⋆⋆⋆

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Set No. 4

Code No: RR322106

III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2008 ROCKETS AND MISSILES (Aeronautical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. What is the ignition system in the rocket motors; describe all the components of ignition system in the case of liquid propellant rockets. [16] 2. Explain the role of igniters in case of solid propellant rocket motor. What are the desirable characteristics of an igniter and how these characteristics affect the performance of solid rocket motor? [6+5+5] 3. (a) Calculate the turn radius and change in the flight path angle for pull up maneuver of a missile. (b) What is boost sustain trajectory? How would find range and flight time of such a trajectory. [8+8] 4. (a) Discuss the aerodynamic characteristics of various forebodes of the missiles. (b) A missile of mass 400kg is moving with a velocity of 500m/s. How much lateral force the missile needs to developed to execute a turn of 3km radius. What is the corresponding rate of change of flight path angle? [10+6] 5. (a) Derive the equations of translation motion of a rocket in homogeneous gravitational field. (b) What do you mean by gravity turn trajectory, why it has been named so? What is the need for gravity turn trajectory and how it can be accomplished? [8+8] 6. What do you mean by thrust vector control? Explain various methods of thrust vector control in the liquid propellant rockets? [16] 7. Prove that for an N stage rocket with identical stages with same structural factor ∈ and payload ratio of λ. Speed ratio v = −nIn (ε (i − λ) + λ) [16] 8. Discus the crucial materials requirement in the nuclear missiles? Discuss the problems in the material selection. Describe the different materials suitable. [16] ⋆⋆⋆⋆⋆

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