Hardness Test MCQ

Test your knowledge with important Hardness Test MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Hardness Test MCQs at Bissoy

• 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
• Which of the following hardness is least affected by surface scratched and local inhomogeneity of the material?
  ক

  Brinell hardness

  খ

  Mayer hardness

  গ

  Rockwell hardness

  ঘ

  Vickers hardness
• Suppose Brinell hardness measurement is made from a nonstandard ball of diameter 5 mm. If the load applied in 10 mm standard ball is 3000 kg, then what load should be applied on the 5 mm ball to get the consistent reading in hardness measurement?
  ক

  500 kg

  খ

  250 kg

  গ

  750 kg

  ঘ

  1500 kg
• How is Brinell hardness measured?
  ক

  Using a dial gauge showing hardness reading

  খ

  The graph obtained from machine showing hardness

  গ

  Using an indentation profile which will be checked in a microscope for indentation diameter

  ঘ

  By checking the deformation of the ball
• For hard materials, the indenter of the Brinell hardness tester is made of __________
  ক

  steel

  খ

  diamond

  গ

  tungsten carbide

  ঘ

  copper
• The diameter of the steel ball used in Brinell hardness is ________
  ক

  10 mm

  খ

  10 cm

  গ

  1 mm

  ঘ

  3.6 mm
• The Brinell Hardness measurement is a concept based on __________
  ক

  indentation

  খ

  shearing

  গ

  rebound

  ঘ

  scratch
• The Shore hardness test measurement uses the concept of _____________
  ক

  indentation

  খ

  deformation

  গ

  rebound

  ঘ

  scratch
• Hardness of most metals fall in the range of __________ in Mohr’s scale.
  ক

  1-3

  খ

  3-6

  গ

  4-8

  ঘ

  7-10
• The hardness value of martensite according to Mohr’s scale is ___________
  ক

  1

  খ

  10

  গ

  3

  ঘ

  7
• The scratch hardness range is ______________
  ক

  1-10

  খ

  1-100

  গ

  10-1000

  ঘ

  100-110
• Which of the following is not a measurement method for hardness?
  ক

  Scratch hardness

  খ

  Indentation hardness

  গ

  Rebound hardness

  ঘ

  Elongation hardness
• The stress concentration and notch sensitivity are the same phenomena in the material.
  ক

  True

  খ

  False