CDL - COMBINATION VEHICLE PRACTICE TEST WITH APPROVED ANSWERS | LATEST 2024/2025 QUESTIONS AND ANSWERS COMPLETE AND ACCURATE REAL EXAM WITH DETAILED ANSWERS (VERIFIED 100%) |ALREADY GRADED A+!!!!.

CDL - COMBINATION VEHICLE PRACTICE TEST WITH APPROVED
ANSWERS | LATEST 2024/2025 QUESTIONS AND ANSWERS
COMPLETE AND ACCURATE REAL EXAM WITH DETAILED
ANSWERS (VERIFIED 100%) |ALREADY GRADED A+!!!!.


CDL - COMBINATION VEHICLE


You supply air to the trailer tanks by:


A. Pushing in the trailer air supply valve


B. Pulling out the trailer air supply valve


C. Connecting the service air line - - ANS - -A. Pushing in the trailer air supply valve


Loss of air pressure in the emergency line causes:


A. The relay valve to close


B. An increase in air pressure to the service line


C. The trailer's emergency brakes to come on - - ANS - -C. The trailer's emergency
brakes to come on

,A tractor with a(n) ____ trailer requires the shortest stopping distance.


A. Empty


B. Light loaded


C. Fully loaded - - ANS - -C. Fully loaded


Which of these statements is true?


A. The brake and suspension of combination vehicles work best with a light load


B. Light vehicles need more braking power to stop than heavy ones


C. Bobtails tractors can take longer to stop than fully loaded combination vehicles - -
ANS - -C. Bobtails tractors can take longer to stop than fully loaded combination
vehicles


If you cannot make a right turn without swinging into another lane, you should:


A. Swing wide before you make the turn


B. Turn wide as you can complete the turn

,C. Not make that turn. Go to another place to turn - - ANS - -B. Turn wide as you can
complete the turn


The tractor protection valve will close and the trailer emergency brakes will come on
when there is a major leak in what air line?


A. Service


B. Emergency


C. Parking - - ANS - -B. Emergency


Off-tracking or cheating causes of which of these to follow the widest pass while
making a turn?


A. 3 axle tractor towing a 45 foot trailer


B. 3 axle tractor towing two 27 foot trailers


C. A bobtail tractor - - ANS - -A. 3 axle tractor towing a 45 foot trailer


If your vehicle gets stuck on a railroad crossing , you should:

, A. Use reverse to back of the tracks


B. Get out of the vehicle and away from the tracks


C. Turn on your 4-way flashers - - ANS - -B. Get out of the vehicle and away from the
tracks


When driving a set of double trailers, it is necessary to close shut- off valves on some
trailers. Whee are these valves located?


A. In the front of trailers


B. In the middle


C. At the back of trailers used to tow other trailers - - ANS - -C. At the back of
trailers used to tow other trailers


Before you back under a trailer, make sure of what?


A. The trailer brakes are locked


B. The air supply knob is in


C. The air brakes are off - - ANS - -A. The trailer brakes are locked