Practice question

What is the function of the differential lock (inter-axle differential lock) in a tandem-drive commercial truck?

To lock the tandem drive axles together so all drive wheels receive equal power, providing traction in deep mud, sand, or snow
To steer the rear trailer wheels around sharp corners
To increase vehicle top speed on paved expressways
To lock the fifth wheel kingpin mechanism

Answer: A — To lock the tandem drive axles together so all drive wheels receive equal power, providing traction in deep mud, sand, or snow

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