Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 5th Sem New 2150103 Aircraft Structures Ii Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2150103 Date:16/11/2018
Subject Name:Aircraft Structures II
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) What are the failures occur in structural components of aircraft in different
flight conditions?
03
(b) Explain the role of bulkheads and longerons in detail. 04
(c) Explain Flight Envelope (V-n diagram) with the help of neat sketch. 07
Q.2 (a) Define Neutral Axis and its significance. 03
(b) Explain with neat sketch the state of stress at a point in three Dimensions 04
(c) How the structure of passenger aircraft is different from fighter aircraft?
Discuss in detail.
07
OR
(c) Explain the derivation for Bending stress in unsymmetrical section. 07
Q.3 (a) Define Principal Moment of Inertia. 03
(b) Briefly explain about the load bearing members of wing, fuselage and
empennage section with neat sketches.
04
(c) A thin-walled circular section beam has a diameter of 200 mm and is 2 m
long; it is firmly restrained against rotation at each end. A concentrated torque
of 30 kNm is applied to the beam at its mid-span point. If the maximum shear
stress is limited to 200 N/mm? and the maximum angle of twist is 2 ?, calculate
the minimum thickness of beam walls. Take G = 25000 N/ mm?.
07
OR
Q.3 (a) What is the difference between Symmetrical Bending and Unsymmetrical
Bending?
03
(b) Explain torsion of multi cell open section beams. 04
(c) Two cell tube shown in figure 1 subjected to a torque T=100 KN. Calculate
the shear flow in ?? 1
and ?? 2
.
07
Q.4 (a) Define the terms: Shear Centre, Shear Flow. 03
(b) Write the basic equations of equilibrium, compatibility and stress-strain
relations for plane stress condition in polar coordinate system.
04
(c) State the difference between Stiffness and Flexibility Methods of Structural
Analysis.
07
OR
Q.4 (a) Explain the Saint Venant?s Principle for 2D beam problems. 03
(b) Explain displacement associated with Bredt-Batho Shear flow for closed
sections.
04
(c) Determine the value of the redundant for the beam shown in the Figure-2
using Flexibility Method.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2150103 Date:16/11/2018
Subject Name:Aircraft Structures II
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) What are the failures occur in structural components of aircraft in different
flight conditions?
03
(b) Explain the role of bulkheads and longerons in detail. 04
(c) Explain Flight Envelope (V-n diagram) with the help of neat sketch. 07
Q.2 (a) Define Neutral Axis and its significance. 03
(b) Explain with neat sketch the state of stress at a point in three Dimensions 04
(c) How the structure of passenger aircraft is different from fighter aircraft?
Discuss in detail.
07
OR
(c) Explain the derivation for Bending stress in unsymmetrical section. 07
Q.3 (a) Define Principal Moment of Inertia. 03
(b) Briefly explain about the load bearing members of wing, fuselage and
empennage section with neat sketches.
04
(c) A thin-walled circular section beam has a diameter of 200 mm and is 2 m
long; it is firmly restrained against rotation at each end. A concentrated torque
of 30 kNm is applied to the beam at its mid-span point. If the maximum shear
stress is limited to 200 N/mm? and the maximum angle of twist is 2 ?, calculate
the minimum thickness of beam walls. Take G = 25000 N/ mm?.
07
OR
Q.3 (a) What is the difference between Symmetrical Bending and Unsymmetrical
Bending?
03
(b) Explain torsion of multi cell open section beams. 04
(c) Two cell tube shown in figure 1 subjected to a torque T=100 KN. Calculate
the shear flow in ?? 1
and ?? 2
.
07
Q.4 (a) Define the terms: Shear Centre, Shear Flow. 03
(b) Write the basic equations of equilibrium, compatibility and stress-strain
relations for plane stress condition in polar coordinate system.
04
(c) State the difference between Stiffness and Flexibility Methods of Structural
Analysis.
07
OR
Q.4 (a) Explain the Saint Venant?s Principle for 2D beam problems. 03
(b) Explain displacement associated with Bredt-Batho Shear flow for closed
sections.
04
(c) Determine the value of the redundant for the beam shown in the Figure-2
using Flexibility Method.
07
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2
Q.5 (a) Enlist the assumptions considered while analyzing the beams for
unsymmetrical bending.
03
(b) Define Flexibility and state the characteristics of Flexibility Matrix. 04
(c) Derive the equation for the shear flow of open section. 07
OR
Q.5 (a) Write down the difference between torsion of open and closed Sections. 03
(b)
Explain the State of Plane Stress.
04
(c) Calculate the value of member end reactions for the beam shown in Figure-
3 using Stiffness System Approach. EI=constant.
07
Figure-1
Figure-2
Figure-3
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This post was last modified on 20 February 2020