Composite Materials MCQ

Test your knowledge with important Composite Materials MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Composite Materials MCQs on Bissoy. Bissoy App

• What are the sequence of steps involved in the manufacture of carbon fibre?
  ক

  Cooling-Carbonization-Graphitization

  খ

  Graphitization-Carbonization-Cooling

  গ

  Heating-Carbonization-Graphitization

  ঘ

  Graphitization-Carbonization-Heating
• Asbestos is used in reinforcing fibre.
  ক

  True

  খ

  False
• How is carbon fibre manufactured?
  ক

  Heating

  খ

  Thermal degradation of PAN

  গ

  Cooling of PAN

  ঘ

  Thermal degradation of polyethylene
• Composite materials are a plastic matrix.
  ক

  True

  খ

  False
• What is the value of ε22, when the values of ε11 and υ12 are given by 0.725*10-4 and 0.21 respectively?
  ক

  0.152*10-4

  খ

  0.58*10-4

  গ

  -0.58*10-4

  ঘ

  -0.152*10-4
• What is the value of normal strain (ε11) for a rectangular plate whose length and thickness are given by 100mm*1mm respectively, when a tensile load of 1000N is applied parallel to the fiber direction? Take the value of E11 as 138GPa.
  ক

  72.5 * 10-4

  খ

  725.6 *10-6

  গ

  7.25 * 10-4

  ঘ

  0.725 * 10-4
• In the case of unidirectional fiber reinforced composites with fibers oriented in the 1-direction, how cannot υ23 be related to υ12 and υ21?
  ক

  υ23 = υ32

  খ

  υ12 = υ21

  গ

  υ23 = υ12 * ((1 – υ21) / (1 – υ12))

  ঘ

  υ32 = υ12 * ((1 – υ21) / (1 – υ12))
• When the lamina is reinforced with fibers in 1 (principal axis frame reference coordinate system) direction, if E1 > E2, then what is the relationship between 1Δ2 and 2Δ1?
  ক

  1Δ2 > 2Δ1

  খ

  1Δ2 < 2Δ1

  গ

  1Δ2 = 2Δ1

  ঘ

  1Δ2 = 2 * 2Δ1
• What is the value of υ21 if the values of E11, E22 and υ12 are given by E11 = 138GPa, E22 = 10GPa and υ12 = 0.21?
  ক

  0.818

  খ

  1.225

  গ

  0.9898

  ঘ

  0.0152
• If the stiffness coefficients S12, S11, S22 are known, then the formula for finding the compliance coefficient C11 is __________
  ক

  C11 = S22 / (S11 * S12 – S222)

  খ

  C11 = S11/ (S11 * S12 – S222)

  গ

  C11 = S22 / (S11 * S22 – S122)

  ঘ

  C11 = S12/ (S11 * S12 * S222)
• The relation between the Shear stress (τ), Shear strain (γ) for any isotropic or orthotropic solid is given by _________
  ক

  τ = Gγ

  খ

  τ = 1/(Gγ)

  গ

  τ = G/γ

  ঘ

  τ = γ/G
• Which of the following coupling is not exhibited by orthotropic materials when they are stressed in the principle material direction?
  ক

  Extension – extension coupling

  খ

  Shear – Shear coupling

  গ

  Extension coupling

  ঘ

  Shear coupling
• How is the Young’s modulus of an orthotropic material is measured?
  ক

  Uniaxial tensile testing

  খ

  Failure testing

  গ

  Rigidity testing

  ঘ

  Flexibility testing
• The relationship between the terms C1212, C1111 and C1122 is given by ___________
  ক

  C1212 = C1111 + C1122

  খ

  C1212 = C1111 – C1122

  গ

  C1212 = ½ (C1111 + C1122)

  ঘ

  C1212 = ½ (C1111 – C1122)
• Which of the following coupling term is not linked in the compliance matrix?
  ক

  Extension – extension coupling

  খ

  Shear – extension coupling

  গ

  Shear – shear coupling

  ঘ

  Bending coupling
• What is the value of S44 in the compliance matrix of a glass/epoxy lamina whose G23 = 3GPa?
  ক

  3.33* 10-9 Pa-1

  খ

  3.33* 10-10 Pa-1

  গ

  3.33* 10-12 Pa-1

  ঘ

  3.33* 10-15 Pa-1
• What is the S11 term of the compliance matrix of a glass/epoxy lamina whose material property E1= 181GPa?
  ক

  9.709 * 10-9 Pa-1

  খ

  5.525* 10-9 Pa-1

  গ

  5.525* 10-12 Pa-1

  ঘ

  9* 10-9 Pa-1
• Which of the following is not an anisotropic material?
  ক

  Diamond

  খ

  Composite material

  গ

  Bone

  ঘ

  Glass
• The elasticity tensor Cmnrs in the transformed system is given as __________ (where T = Transformation matrix)
  ক

  Cmnrs = Ti Tk Ti Tl Cijkl

  খ

  Cmnrs = Ti Tj Tk Tl Cijkl

  গ

  Cmnrs = Tj Ti Tl Tk Cijkl

  ঘ

  Cmnrs = Tj Ti Tk Tl Cijkl
• The terms s44, s55 and s66 in the compliance matrix represents __________
  ক

  shear modulus

  খ

  extension modulus

  গ

  coupling

  ঘ

  bending stiffness
• The terms representing the coupling between the dissimilar normal stresses and normal strains are __________
  ক

  s11, s22 and s33

  খ

  s12, s22 and s33

  গ

  s12, s13 and s23

  ঘ

  s11, s23 and s33
• What does the terms S11, S22 and S33 in the compliance matrix represent?
  ক

  Extensional bending to an individual applied stress

  খ

  Extensional stiffness to an individual applied stress

  গ

  Normal stresses to an individual applied stress

  ঘ

  Normal strains to an individual applied stress
• Which of the following is not true with respect to the orthotropic lamina?
  ক

  It follows plane stress condition

  খ

  Stress components in all out of plane conditions are zero

  গ

  It has the reduced stiffness matrix from 3D to 2D

  ঘ

  It doesn’t possess material symmetry at all
• What is the major objective in studying the stress – strain relations?
  ক

  In order to conclude what deformation occurs because of a specific applied stress

  খ

  In order to see the effect of only the anisotropic behavior of the body

  গ

  In order to detect the properties of the material along only one direction

  ঘ

  In order to know the behavior of materials when no load is applied
• Which of the following is a wrong representation of compliance in terms of engineering constants?
  ক

  S11 = 1/E1

  খ

  S22 = 1/E2

  গ

  S12 = -(γ21/E2)

  ঘ

  S66 = 1/G12
• Which of the following is not true about the monoclinic materials?
  ক

  Monoclinic materials possess one plane of material property symmetry

  খ

  Monoclinic material has 13 independent elastic constants

  গ

  There will be 2 axes of symmetry

  ঘ

  The plane of symmetry is about XY plane (Z=0)
• The alternate name for characterizing anisotropic materials are ___________
  ক

  monoclinic materials

  খ

  symmetric materials

  গ

  triclinic materials

  ঘ

  orthotropic materials
• stiffness matrix (Cij) of an anisotropic material will have 36 elastic constants.
  ক

  True

  খ

  False
• The relation between Engineering Shear Strain (γ12) and the Tensor Shear Strain (ε12) is given by __________
  ক

  4γ12 = ε12

  খ

  γ12 = 4ε12

  গ

  2γ12 = ε12

  ঘ

  γ12 = 2ε12
• What is the best definition of Engineering Shear Strain (γij)?
  ক

  It is the half of the angle of shearing under pure shear stress

  খ

  It is half of the angle of shearing under pure shear strain

  গ

  It is the total angle of shearing under a state of simple shear

  ঘ

  They don’t have an accompanying rotation