CDL Permit Combination Vehicles Exam
Questions And Answers
What will happen if the service air line comes apart while you are
driving a combination vehicle? -
correct answer ✅Nothing is likely to happen until you put on your
brakes.
Fully loaded rigs are______ times more likely to rollover in a crash
than empty rigs -
correct answer ✅10
Failure to keep the______ lubricated could cause steering problems
because of friction between tractor and trailer. -
correct answer ✅fifth wheel plate
If the service and emergency lines are crossed when hooking up an
old trailer what will happen? -
correct answer ✅You will be able to drive away, but you will not
have trailer brakes.
When lowering the landing gear of a loaded trailer? -
correct answer ✅Turn the crank in low gear a few extra turns after
the landing gear makes firm contact with the ground.
, CDL Permit Combination Vehicles Exam
Questions And Answers
The standard following distance behind other vehicles is at least? -
correct answer ✅One second for each ten feet of vehicle length
plus another second if going over 40 mph
After the tractor has coupled with the semi trailer, in what position
should you put the front trailer supports, or landing gear before
driving away? -
correct answer ✅Fully raised with the crank handle safely secured.
The air leakage rate for a combination vehicle (engine off, brake off)
should be less than? -
correct answer ✅3
You are coupling a tractor and semi trailer, and ready to back your
trailer under a semi trailer. When is the trailer at the right height? -
correct answer ✅When the trailer is raised slightly by the tractor
as the tractor is backed under it.
Why should the trailer glad hands be locked together or attached
to"dead end", or dummy, couplers when not in use? -
correct answer ✅To keep dirt out of the lines.
Questions And Answers
What will happen if the service air line comes apart while you are
driving a combination vehicle? -
correct answer ✅Nothing is likely to happen until you put on your
brakes.
Fully loaded rigs are______ times more likely to rollover in a crash
than empty rigs -
correct answer ✅10
Failure to keep the______ lubricated could cause steering problems
because of friction between tractor and trailer. -
correct answer ✅fifth wheel plate
If the service and emergency lines are crossed when hooking up an
old trailer what will happen? -
correct answer ✅You will be able to drive away, but you will not
have trailer brakes.
When lowering the landing gear of a loaded trailer? -
correct answer ✅Turn the crank in low gear a few extra turns after
the landing gear makes firm contact with the ground.
, CDL Permit Combination Vehicles Exam
Questions And Answers
The standard following distance behind other vehicles is at least? -
correct answer ✅One second for each ten feet of vehicle length
plus another second if going over 40 mph
After the tractor has coupled with the semi trailer, in what position
should you put the front trailer supports, or landing gear before
driving away? -
correct answer ✅Fully raised with the crank handle safely secured.
The air leakage rate for a combination vehicle (engine off, brake off)
should be less than? -
correct answer ✅3
You are coupling a tractor and semi trailer, and ready to back your
trailer under a semi trailer. When is the trailer at the right height? -
correct answer ✅When the trailer is raised slightly by the tractor
as the tractor is backed under it.
Why should the trailer glad hands be locked together or attached
to"dead end", or dummy, couplers when not in use? -
correct answer ✅To keep dirt out of the lines.
