Download PTU B.Tech 2020 March Aero 5th Sem ASPE 305 Aerospace Propulsion Ii Question Paper

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Roll No. [T TP TT] Total No. of Pages : 02

Total No. of Questions : 09

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B.Tech.(Aerospace Engg.) (2012 Onwards) (Sem.-5)

AEROSPACE PROPULSION-II

Subject Code : ASPE-305

M.Code : 71839

Time : 3 Hrs. Max. Marks : 60

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

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1. Answer in short :
   1. What is the function of connecting rod in an I.C. engine?
   2. What is valve timing diagram?
   3. What is stochiometric air fuel ratio?
   4. Define polytropic efficiency.
   5. Define surging.

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   6. Define slip factor.
   7. Define fore body drag.
   8. What is normal shock wave?
   9. Define inlet mass flow ratio.
   10. How much thrust is increased by using an afterburner?

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SECTION-B

1. Describe the working of a two stroke petrol engine.
2. Explain the working of a Brayton cycle and derive the work input relationship.
3. Explain the working of a typical combustion chamber for a jet engine.

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4. Describe the following with reference to nozzle :
   1. Over expanded and under expanded nozzles.
   2. Thrust reversal.
5. Describe the working of a centrifugal compressor and find the expression for work done and pressure rise.

SECTION-C

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1. Write any one method of nozzle design with the help of neat figures.
2. Describe the working of an internal compression supersonic inlet. What is Buzz?
3. A ten stage axial flow compressor provides a total head pressure ratio of 5 : 1 with an overall total head isentropic of 87% when the inlet total head temperature is 288°K. The work is divided equally between the stages and work done factor is 0.85. Find air angles of a stage at the design radius where the blade speed is 215 m/sec. Assume the axial velocity as constant throughout the stage at 167 m/s and degree of reaction is 80%.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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