Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III CONCEPTUAL DESIGN OF FLIGHT VEHICLES Previous Question Paper (December - 2018 - R15)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
Define aircraft glass weight with required equation and terms.
Answer
Aircraft glass weight refers to the total weight of the transparent enclosures, including windshields, cabin windows, and canopies. It is estimated using the equation: Wglass = Sglass × tglass × ρglass, where Sglass is the total surface area of the glass, tglass is the average thickness, and ρglass is the density of the material.
Briefly compare three phases of aircraft design process.
Answer
The three phases of aircraft design are:
- Conceptual Design: Focuses on feasibility, sizing, and basic configuration layout to meet mission requirements.
- Preliminary Design: Refines the configuration, performs detailed wind tunnel testing, and optimizes structural and systems integration.
- Detail Design: Involves final manufacturing drawings, material specifications, and production planning for the actual build.
Define conic lofting.
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Compare rubber and fixed size engines.
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Define nozzle integration.
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Discuss about the gear retraction geometry.
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Define gust loads.
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What is thrust-drag book keeping?
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Define static lateral– directional stability.
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Describe about the instantaneous turn rate.
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Part B
Explain the importance of using geometry showing different wing location.
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Explain the need of wing tips, with various types of wing tips used in a/c.
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Explain the role of tail arrangement in spin recovery.
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Discuss the importance of thrust matching in performance of an engine.
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Justify, which type of lofting is best suitable for designing an aircraft with an example.
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Describe briefly about tail volume coefficient.
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Discuss airfoil flat-wrap interpolation.
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Write about the consideration required for vulnerability of fight a/c design.
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Explain the inlet geometry required in a/c engine design while showing the sketches of various inlet locations.
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Describe landing gear arrangements. Which type of landing gear arrangement is being used in Boeing B-777?
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Discuss types of inlet locations and their importance.
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Briefly write about gear retraction mechanism and geometry employee.
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Compare subsonic and supersonic lift-curve slopes. According to you which produce a high lift for a passenger aircraft of Mach number less than 0.8?
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Briefly write about installed net propulsive force corrections.
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Draw and explain the V-n diagram. State its importance in aircraft design.
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Explain about trim drag and flap effect on induced drag.
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Differentiate between the Takeoff analysis and Landing analysis.
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How to optimize the range of a jet aircraft? Derive an expression to support your answer.
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Write briefly about operations and maintenance costs involved in aircrafts and airlines.
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Analyze the gliding flight to show a speed-polar or hodograph.
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