R&m Ut2.docx

Er. Perumal Manimekalai College of Engineering Department of Aeronautical Engineering UNIT TEST – II AE2033/ROCKETS AND MISSILES Year/ Sem: IV/VIII Date: 09.03.2016

Marks: 50 Time: 1𝟏⁄𝟐 hrs

PART – A (2*10=20 Marks) 1. What is the need for using ceramic materials in missiles? 2. What are the criteria for the selection of materials for aerospace applications? 3. Mention the materials used for short range ballistic missile parts? 4. Write down the materials you suggest for ablative cooling of re entry bodies? 5. What are the advantage and disadvantages of graphite as a nozzle material? 6. Give examples of materials used for main bodies of long range missiles? 7. Define Aerodynamic heating? 8. List the importance of composite material in spacecraft? 9. What are the types of cooling methods of missiles? 10. Define brute force system. PART – B (3*10=30 Marks) 11. a) What are the considerations for selection of materials to be use for the construction of thrust chambers of liquid rocket engines? (10) (Or) b) Explain the ablation cooling method of re entry bodies (10) 12. a) What are the possible materials that can be used for nose/fore body, win and Inter stage couplings of short range and long range ballistic missiles? (10) (Or) b) Explain any two types of cooling methods. (10) 13. a) Explain about aerodynamic heating problems. (Or) b) What are the effects of space environment on materials?

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