Aerospace Vehicle Structures - II Mid - I, September - 2014

1.The middle plane of the plate does not deform during the bending is called
  • Neutral plane
  • middle plane
  • normal plane
  • none
Answer: A
2.Plane sections remaining plane the direct stresses vary linearly across the thickness of the plate, their magnitudes depending on the Thickness
  • curvature
  • length of plate
  • none
Answer: B
3.A surface possessing two curvatures of opposite sign is known as an
  • Curved surface
  • synclastic surface
  • anticlastic surface
  • none
Answer: C
4.The twisting moments are tangential moments or torques they are resisted by a system of horizontal
  • Strain
  • shear strain
  • stress
  • shear stress
Answer: D
5.Mt = 0, leaving normal moments of intensity Mn, on two mutually perpendicular planes. These moments are termed as ________ moments.
  • Principal
  • perpendicular
  • tangential
  • none
Answer: A
6.It is common experience that if an increasing axial compressive load is applied to a slender column there is a value of the load at which the column will suddenly
  • Break
  • buckle
  • cripple
  • none
Answer: B
7.If the perfect column is subjected to a compressive load P, only ______of the column occurs no matter what the value of P
  • Breaking
  • buckling
  • shortening
  • crippling
Answer: C
8.In critical stress formula the term l / r is known as the ___________ of the column
  • Length to radius
  • buckling ratio
  • failure ratio
  • slenderness ratio
Answer: D
9.For a pin-ended column, if the column remains undisturbed the deflection at mid-height would continue to be
  • Zero
  • maximum
  • minimum
  • unchanged
Answer: A
10.Method for predicting critical loads and stresses outside the elastic range is known as
  • Increased modulus theory
  • reduced modulus theory
  • constant modulus theory
  • none
Answer: B
11.It is assumed that plane sections of beams remain _______ after displacement produced by the loading.
Answer: Plane
12.A bending moment M applied in any longitudinal plane parallel to the z axis may be resolved into components ___________ by the normal rules of vectors.
Answer: Mx and My
13.The beam supports bending moments Mx and My and bends about some axis in its cross-section which is therefore an axis of ______________.
Answer: zero stress or a neutral axis
14.The beam supports pure bending moments so that the resultant normal load on any section must be __________.
Answer: Zero
15.In any unsymmetrical cross-section, a centroidal set of axes for which the _____________ of area is zero.
Answer: Product of second moment
16.The ____________ strain E, is zero in a closed section beam subjected to a pure torque.
Answer: Longitudinal
17.The warping must be zero at points where the axes of symmetry and the walls of the cross-section___________.
Answer: Intersect
18.A closed section beam for which pRGt = constant does not warp and is known as a ___________.
Answer: Neuber beam
19.We assume in open beam torsion analysis that the cross-section is maintained by the system of closely spaced __________.
Answer: Diaphragms
20.Warping of the beam across its wall thickness is called ___________.
Answer: Secondary warping