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CDL Doubles and Triples Endorsement T Practice Test -4

Study for your CDL Doubles & Triples Endorsement Test with this FREE Practice Test. 25 practice Questions for CDL Doubles & Triples Endorsement Test straight from the CDL hand book, Stop stressing about the test and practice today with our multiple choice practice test.
Questions number
Mistakes Allowed
Passing Score


A typical tractor unit needs how many seconds to clear a single track of a railroad?
  • 5 seconds.
  • 8 seconds.
  • 14 seconds.
  • 20 seconds.
At what psi will the tractor protection valve close?
  • 80-95 psi.
  • 60-85 psi.
  • 100-125 psi.
  • 50-75 psi.
  • 20 to 45 psi.
Controlled braking is only possible _________.
  • If performed by a bad driver.
  • During the warm weather.
  • While enough air remains in the air tanks.
  • If the air storage tank has oil in it.
How often should alcohol containers be checked during cold weather?
  • Every month.
  • Every week.
  • Every five hours.
  • Every two weeks.
  • Every day.
If the air compressor is belt-driven, you should ________.
  • Check the condition only.
  • Check the tightness of the belt only.
  • Check the weather forecast.
  • Check the condition and the tightness of the belt.