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True or false: a strain gauge measures stress directly.

  • A.True, the resistance change being proportional to the applied stress
  • B.True, provided the material's modulus of elasticity is known
  • C.True, stress and strain being the same quantity in different units
  • D.False, the gauge responds to strain and not to stress

Answer: D

The gauge responds to the strain of the surface it is bonded to. Stress follows only by multiplying by the modulus of elasticity of the material, so the modulus must be known and the material must be within its elastic range.

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