CDL - SECTION 6: COMBINATION
VEHICLES Exam Questions With Verified
Answers.
What two things are important to prevent rollover? - answerKeep cargo as close to the ground
as possible and drive slowly around turns.
When you turn suddenly while pulling doubles, which trailer is most likely to turn...
What two things are important to prevent rollover? - answer✔Keep cargo as close to the ground
as possible and drive slowly around turns.
When you turn suddenly while pulling doubles, which trailer is most likely to turn over? -
answer✔The rear trailer is twice as likely to turn over.
Why should you NOT use the trailer hand brake to straighten out a jackknifing trailer? -
answer✔The brakes on the trailer wheels cause the skid -- release so the trailer wheels will grip
the road again.
What is off-tracking? - answer✔When a vehicle goes around a corner and the rear wheels follow
a different path than the front wheels.
When you back a trailer, how should you position your vehicle? - answer✔So you can back in a
curved path to the driver's side.
What type of trailers can get stuck on railroad-highway crossings? - answer✔Low slung units
(lowboy, car carrier, moving van, possum-belly livestock trailer) AND a single-axle tractor
pulling a long trailer with its landing gear set to accommodate a tandem-axle tractor.
Why should you NOT use the trailer hand valve while driving? - answer✔The danger of making
the trailer skid.
Describe what the trailer air supply control does. - answer✔Push in -- Supply air to trailer; Push
out -- Shut air off and put on trailer emergency brakes
Describe what the service line is for. - answer✔Carries air, which is controlled by the foot brake
or the trailer hand brake.
What is the emergency air line for? - answer✔Supplies air to the trailer air tanks; Controls the
emergency brakes on combination vehicles.
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