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Which axle type carries both front wheels on a single beam?

  • A.The swing axle, in which each half shaft pivots about the differential and carries the wheel at its outer end
  • B.The beam axle
  • C.The independent front suspension, in which each wheel is carried on its own linkage and moves without the other
  • D.The de Dion axle

Answer: B

A beam axle connects the two wheels rigidly and is used on commercial vehicles and off road vehicles for its strength and simplicity. Its weakness is that a bump at one wheel disturbs the other. Passenger cars use independent suspension almost universally. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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