CA CDL Combination Vehicles Test Exam
Questions And Answers
If you cannot make a turn without entering another traffic lane, you
should: -
correct answer ✅Turn wide as you complete the turn
You have pushed in the trailer supply valve. You should not move
the tractor until the whole air system is: -
correct answer ✅At normal pressure
Loss of air pressure in the emergency line causes: -
correct answer ✅The trailer's emergency brakes to come on
To stop a trailer skid, you should: -
correct answer ✅Release the service brakes
The air leakage rate for a combination of two vehicles (engine off,
brakes off) should not be greater than: -
correct answer ✅3 psi or less in one minute
You are uncoupling a trailer. After you shut off the trailer air supply
and lock the trailer brakes, you should: -
correct answer ✅Back up gently to ease pressure on the fifth
wheel locking jaws
, CA CDL Combination Vehicles Test Exam
Questions And Answers
Before you back under a truck trailer, make sure the: -
correct answer ✅Trailer brakes are locked
The tractor protection value will close and the trailer emergency
brakes will come on when there is a major leak in which brake line?
-
correct answer ✅Emergency brake line
To prevent a jackknife in normal driving, some drivers use the hand
valve before stopping on the brake pedal. Which of these
statements is true? -
correct answer ✅It should not be done
When you get ready to back under a trailer, you should line up: -
correct answer ✅Directly in front of the trailer
You have a major leak in the service line and you put on the brakes.
Service air pressure will escape and cause the: -
correct answer ✅Trailer emergency brakes to come on
Questions And Answers
If you cannot make a turn without entering another traffic lane, you
should: -
correct answer ✅Turn wide as you complete the turn
You have pushed in the trailer supply valve. You should not move
the tractor until the whole air system is: -
correct answer ✅At normal pressure
Loss of air pressure in the emergency line causes: -
correct answer ✅The trailer's emergency brakes to come on
To stop a trailer skid, you should: -
correct answer ✅Release the service brakes
The air leakage rate for a combination of two vehicles (engine off,
brakes off) should not be greater than: -
correct answer ✅3 psi or less in one minute
You are uncoupling a trailer. After you shut off the trailer air supply
and lock the trailer brakes, you should: -
correct answer ✅Back up gently to ease pressure on the fifth
wheel locking jaws
, CA CDL Combination Vehicles Test Exam
Questions And Answers
Before you back under a truck trailer, make sure the: -
correct answer ✅Trailer brakes are locked
The tractor protection value will close and the trailer emergency
brakes will come on when there is a major leak in which brake line?
-
correct answer ✅Emergency brake line
To prevent a jackknife in normal driving, some drivers use the hand
valve before stopping on the brake pedal. Which of these
statements is true? -
correct answer ✅It should not be done
When you get ready to back under a trailer, you should line up: -
correct answer ✅Directly in front of the trailer
You have a major leak in the service line and you put on the brakes.
Service air pressure will escape and cause the: -
correct answer ✅Trailer emergency brakes to come on
