NYC CDL COMBINATION VEHICLES
EXAM QUESTIONS AND ANSWERS
What two things are important to prevent rollover? -
correct answer ✅keep your cargo low and centered
When you turn suddenly while pulling doubles, which trailer is most
likely to turn over? -
correct answer ✅Fully loaded rigs are ten times more likely to roll
over in a crash than empty rigs.
The rear trailer is more likely to roll over.
Why should you not use the trailer hand brake to straighten out a
jackknifing trailer? -
correct answer ✅because the trailer tires are what caused the
jackknife, they need to get traction not lock up
What is off tracking? -
correct answer ✅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 drivers side. True or False? -
correct answer ✅true
, NYC CDL COMBINATION VEHICLES
EXAM QUESTIONS AND ANSWERS
What type of trailers can get stuck on railroad-highway crossings? -
correct answer ✅Low slung units (lowboy, car carrier, moving van,
possum-belly livestock trailer).
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? -
correct answer ✅the danger of making the trailer skid
Describe what the trailer air supply control does. -
correct answer ✅push it in to supply the trailer with air, pull it out
to shut the air off and put on the emergency brakes
Describe what the service line is for -
correct answer ✅carries air, which is controlled by the foot brake
or hand valve
What is the emergency air line for? -
correct answer ✅supplies air to the trailer air tanks, and controls
the emergency brakes on a combination vehicle
EXAM QUESTIONS AND ANSWERS
What two things are important to prevent rollover? -
correct answer ✅keep your cargo low and centered
When you turn suddenly while pulling doubles, which trailer is most
likely to turn over? -
correct answer ✅Fully loaded rigs are ten times more likely to roll
over in a crash than empty rigs.
The rear trailer is more likely to roll over.
Why should you not use the trailer hand brake to straighten out a
jackknifing trailer? -
correct answer ✅because the trailer tires are what caused the
jackknife, they need to get traction not lock up
What is off tracking? -
correct answer ✅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 drivers side. True or False? -
correct answer ✅true
, NYC CDL COMBINATION VEHICLES
EXAM QUESTIONS AND ANSWERS
What type of trailers can get stuck on railroad-highway crossings? -
correct answer ✅Low slung units (lowboy, car carrier, moving van,
possum-belly livestock trailer).
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? -
correct answer ✅the danger of making the trailer skid
Describe what the trailer air supply control does. -
correct answer ✅push it in to supply the trailer with air, pull it out
to shut the air off and put on the emergency brakes
Describe what the service line is for -
correct answer ✅carries air, which is controlled by the foot brake
or hand valve
What is the emergency air line for? -
correct answer ✅supplies air to the trailer air tanks, and controls
the emergency brakes on a combination vehicle
