JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III AIRCRAFT DESIGN Previous Question Paper (February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What are the advantages of various wing tip shapes?
Answer
Wing tip shapes, such as winglets, raked wing tips, and blended winglets, are primarily designed to reduce induced drag by minimizing the strength of wingtip vortices. By modifying the airflow at the tips, these shapes improve the lift-to-drag ratio, which directly enhances fuel efficiency and increases the effective aspect ratio of the wing without significantly increasing the wingspan. Additionally, they can improve low-speed handling characteristics and reduce the noise footprint during takeoff and landing.
Sketch and explain the design wheel.
Answer
The design wheel is a conceptual framework used in aircraft design to represent the iterative and interdisciplinary nature of the design process. It illustrates that aircraft design is not a linear sequence but a cycle of continuous refinement.
The wheel typically consists of several interconnected segments representing key design phases, such as:
- Requirements Definition: Establishing mission profiles and performance targets.
- Conceptual Design: Initial sizing, configuration layout, and trade-off studies.
- Preliminary Design: Detailed analysis of aerodynamics, structures, and propulsion.
- Detailed Design: Final manufacturing specifications and system integration.
The central hub of the wheel represents the design requirements, while the spokes represent the dependencies between different engineering disciplines. As the design progresses through the cycle, feedback loops allow engineers to revisit earlier stages to optimize parameters, ensuring that the final aircraft meets all safety, weight, and performance constraints.
What do you mean by Wing group weight?
Answer
Sign in to view the complete answer paper.
Mention tail geometry and their arrangements.
Answer
Sign in to view the complete answer paper.
Write the functions of shock absorbers in landing gear.
Answer
Sign in to view the complete answer paper.
Discuss briefly about balanced field length.
Answer
Sign in to view the complete answer paper.
Why Aircraft needs Steady Climbing and Descending flight?
Answer
Sign in to view the complete answer paper.
Write an expression for best angle and rate of climb.
Answer
Sign in to view the complete answer paper.
How would you define trade studies?
Answer
Sign in to view the complete answer paper.
What do you know about RDT and E and production costs?
Answer
Sign in to view the complete answer paper.
Part B
What type of plan form shapes of wings are used in aircrafts? Explain with neat sketch.
Answer
Sign in to view the complete answer paper.
Draw the flow chart for Take-off gross weight calculations and explain.
Answer
Sign in to view the complete answer paper.
Explain flight envelop and phases of flight.
Answer
Sign in to view the complete answer paper.
Explain mission profiles with a neat sketch and also explain mission segment weight fractions for simple cruise.
Answer
Sign in to view the complete answer paper.
Explain in detail about aerodynamic considerations in configuration layout and crashworthiness considerations.
Answer
Sign in to view the complete answer paper.
Write a short note on Wing and tail initial sizing with neat sketches.
Answer
Sign in to view the complete answer paper.
Explain the process of making decision to select type of engine for particular aircraft design.
Answer
Sign in to view the complete answer paper.
Explain how the volume of the fuselage of a commercial passenger aircraft can be computed?
Answer
Sign in to view the complete answer paper.
Discuss the installed thrust correction for turbojet engine with neat sketches and plots.
Answer
Sign in to view the complete answer paper.
Explain three types of conventional landing gear system with suitable sketches.
Answer
Sign in to view the complete answer paper.
Explain retraction geometry of main undercarriage with neat sketch.
Answer
Sign in to view the complete answer paper.
Enumerate different types of propellers. Derive an equation for efficiency of the propeller.
Answer
Sign in to view the complete answer paper.
Describe the handling qualities of an aircraft Cooper-Harper rating scale.
Answer
Sign in to view the complete answer paper.
Describe the need for controls in airplane associated with the static and dynamic stabilities of an airplane.
Answer
Sign in to view the complete answer paper.
Illustrate the process of estimating stability and control derivatives. What is steady level flight?
Answer
Sign in to view the complete answer paper.
Interpret the selection criteria for the materials of Engine components.
Answer
Sign in to view the complete answer paper.
Explain the significance of Break-Even analysis in Aircraft and Airline economics.
Answer
Sign in to view the complete answer paper.
What are direct operating cost and indirect operating cost? Determine the final base line design configuration.
Answer
Sign in to view the complete answer paper.
Write about the case study on General dynamics of F-16, SR-71 Blackbird aircrafts.
Answer
Sign in to view the complete answer paper.
Explain elements of lift – cycle cost and cost – estimating methods.
Answer
Sign in to view the complete answer paper.