WA Cdl Combination vehicles Exam
Questions and Answers
What two things are important to prevent rollover -
correct 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 -
correct answer ✅the rear trailer is twice as likely to turn over as
the tractor
Why should you not use the trailer hand brake to straighten out a
jackknifing trailer -
correct answer ✅The brakes on the trailer wheels caused the skid
release the brakes to allow the wheels to grip the road again
What is "Off-Tracking" -
correct answer ✅When a vehicle goes around a corner the rear
wheels follow a different path than the front wheels
When you back a trailer you should position your vehicle so you can
back in a curved path to the driver's side true or false -
correct answer ✅Only true if you cannot back in a straight line
, WA Cdl Combination vehicles Exam
Questions and Answers
What type of trailers can get stuck on Railroad Highway Crossings -
correct answer ✅Low-slung units such as lowboy car carrier
moving van possum belly and livestock trailer also single axle
tractors pulling a long trailer with its landing gear set to
accommodate a tandem axle trailer
Why should you not use the trailer hand valve while driving -
correct answer ✅Because of the danger of making the trailer skid
Describe what the trailer Air Supply control does -
correct answer ✅Push in the trailer air supply to supply the trailer
with air pull it out to shut the air off and put on the trailer
emergency brakes
Describe what the service line is 4 -
correct answer ✅The service line carries air which is controlled by
the foot brake or the trailer hand brake the service line is
connected to relay valves the valves allow the trailer brakes to be
applied more quickly
Why should you use chocks when parking a trailer without brakes -
correct answer ✅Use chocks to prevent trailers without spring
brakes from moving
Questions and Answers
What two things are important to prevent rollover -
correct 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 -
correct answer ✅the rear trailer is twice as likely to turn over as
the tractor
Why should you not use the trailer hand brake to straighten out a
jackknifing trailer -
correct answer ✅The brakes on the trailer wheels caused the skid
release the brakes to allow the wheels to grip the road again
What is "Off-Tracking" -
correct answer ✅When a vehicle goes around a corner the rear
wheels follow a different path than the front wheels
When you back a trailer you should position your vehicle so you can
back in a curved path to the driver's side true or false -
correct answer ✅Only true if you cannot back in a straight line
, WA Cdl Combination vehicles Exam
Questions and Answers
What type of trailers can get stuck on Railroad Highway Crossings -
correct answer ✅Low-slung units such as lowboy car carrier
moving van possum belly and livestock trailer also single axle
tractors pulling a long trailer with its landing gear set to
accommodate a tandem axle trailer
Why should you not use the trailer hand valve while driving -
correct answer ✅Because of the danger of making the trailer skid
Describe what the trailer Air Supply control does -
correct answer ✅Push in the trailer air supply to supply the trailer
with air pull it out to shut the air off and put on the trailer
emergency brakes
Describe what the service line is 4 -
correct answer ✅The service line carries air which is controlled by
the foot brake or the trailer hand brake the service line is
connected to relay valves the valves allow the trailer brakes to be
applied more quickly
Why should you use chocks when parking a trailer without brakes -
correct answer ✅Use chocks to prevent trailers without spring
brakes from moving
