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Which measure quantifies the torsional rigidity of a chassis?

  • A.The deflection at the centre of the wheelbase when the vehicle is supported at both ends and loaded centrally
  • B.Torque applied per degree of twist between the axles
  • C.The maximum load that the structure is able to carry before any permanent deformation occurs within it
  • D.The natural frequency

Answer: B

Torsional rigidity is quoted in newton metres per degree, measured by applying a couple at one axle while restraining the other and measuring the resulting angle. Modern unitary cars achieve twenty to forty thousand newton metres per degree. The last option describes bending stiffness, which is the other principal structural measure. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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