GATE AE Flight Vehicle Structures PYQs & Answers — Page 2

Questions 11–20 of 22. Imported answers require independent review unless marked reviewed.

A two-cell wing box is shown in the figure. The cell walls are 1.5 mm thick and the shear modulus

GPa. If the structure is subjected to a torque of 12 kNm, then the wall AD will experience a shear stress of magnitude __________ MPa (round off to one decimal place).

Diagram for Aerospace Engineering question 50

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A 3 m x 1 m signboard is supported by a vertical hollow pole that is fixed to the ground. The pole has a square cross section with outer dimension 250 mm. The yield strength of the pole material is 240 MPa. To sustain a wind pressure of 7.5 kPa, the dimension d of the pole is __________ mm (round off to nearest integer).

(Neglect the effect of transverse shear and load due to wind pressure acting on the pole)

Diagram for Aerospace Engineering question 52

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The positive high angle-of-attack condition is obtained in a steady pull-out maneuver at the largest permissible angle-of-attack of the wing. Under this condition, at which of the following regions of the wing does the maximum tension occur?

Diagram for Aerospace Engineering question 17

Your answerChoose one option.

III

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A thin walled beam of constant thickness shown in the figure is subjected to a torque of 3.2 kNm. If the shear modulus is 25 GPa, the angle of twist per unit length is ______ rad/m (round off to three decimal places).

Diagram for Aerospace Engineering question 24

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For a beam subjected to a transverse shear load through its shear center,

Your answerChoose one option.

the twist per unit length is zero.

the shear stress is uniform throughout the cross-section.

the bending stresses in the cross section are zero.

the shear strain is zero at the shear center.

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As shown in the figure, a rigid slab CD of weight

(distributed uniformly along its length) is hung from a ceiling using three cables of identical length and cross-sectional area. The central cable is made of steel (Young’s modulus =

) and the other two cables are made of aluminium (Young’s modulus =

). The percentage of the total weight taken by the central cable is _____ % (round off to the nearest integer).

Diagram for Aerospace Engineering question 49

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A thin-walled tube, with the cross-section shown in the figure, is subjected to a torque of

kN-m. The walls have uniform thickness

mm and shear modulus

GPa. Assume that the curved portion is semi-circular. The shear stress in the wall is _____ MPa (round off to 1 decimal place).

Diagram for Aerospace Engineering question 53

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Determine the correctness or otherwise of the following statements, [a] and [r]:

[a] A closed-section box beam configuration is used in aircraft wings.

[r] Closed-section box beam configuration is capable of resisting torsional loads.

Your answerChoose one option.

Both [a] and [r] are true and [r] is the correct reason for [a].

Both [a] and [r] are true but [r] is not the correct reason for [a].

Both [a] and [r] are false.

[a] is true but [r] is false.

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A thin-walled tube with external radius of 100 mm and wall thickness of 2 mm is fixed at one end. It is subjected to a compressive force of 1 N acting at a point on the circumference parallel to its length. The maximum normal stress (in kPa) experienced by the structure is __________ (accurate to two decimal places).

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Which of the following statement(s) is / are true about the shear centre of a cross-section: P: It is that point in the cross-section through which shear loads produce no twisting. Q: This point is also the centre of twist of sections subjected to pure torsion. R: The normal stress at this point is always zero.

Your answerChoose one option.

P, Q and R

P only

P and Q only

P and R only

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GATE AE Flight Vehicle Structures PYQs

Question 50

Question 52

Question 17

Question 24

Question 13

Question 49

Question 53

Question 17

Question 49

Question 11