Torsion Stress for Large Plastic Strains MCQ

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• Match the correct order of the temperature from the following diagram?
  ক

  T1>T2>T3

  খ

  T1<T2<T3

  গ

  T2>T1>T3

  ঘ

  T3>T1>T2
• The typical test temperature in the hot torsion testing is _________
  ক

  just above room temperature

  খ

  below room temperature

  গ

  above 0.6 Tm; where Tm is melting point

  ঘ

  just below the melting point
• Which of the following statement is not correct with respect to the torsion test?
  ক

  σ1 = -σ3; σ2 = 0

  খ

  τmax = 2σ1/2 = σmax

  গ

  ϵmax = ϵ1; ϵ2=ϵ3 = -ϵ1/2

  ঘ

  ϒ max = ϵ1-ϵ3 = 2ϵ1
• A torsion test provides a more fundamental study of the plasticity of the metal than the tension test.
  ক

  True

  খ

  False
• The brittle fracture in the torsion test results in ________ geometry.
  ক

  flat facet

  খ

  helical shape

  গ

  cup and cone

  ঘ

  shear fracture
• For calculating the modulus of rupture from the thin-walled hollow cylinder, the diameter to wall thickness ratio should be in the order of __________
  ক

  10-20

  খ

  50-100

  গ

  1-2

  ঘ

  1000-1500
• In the torsion test, the obtained data are with respect to _____________________
  ক

  stress vs. strain

  খ

  shear stress vs. strain

  গ

  shear stress vs. Shear strain

  ঘ

  twisting moment vs. Angle of twist
• The maximum shear stress for a solid cylindrical bar having diameter D, and torsional moment equal to M will be _______
  ক

  16M/πD3

  খ

  16M/πD4

  গ

  8M/πD

  ঘ

  MD
• In the following torsional test sample, the highest shear stress will be at point ________
  ক

  A

  খ

  B

  গ

  C

  ঘ

  D
• The deformation of the specimen is measured by a twist-measurement device called the troptometer.
  ক

  True

  খ

  False
• The torsion test cannot determine __________
  ক

  modulus of elasticity in shear

  খ

  torsional yield strength

  গ

  modulus of rupture

  ঘ

  tensile strength