Cdl Combination Vehicles Exam
QUESTIONS AND ANSWERS 100%
RATED CORRECT WITH 100% SURE
PASS|GRADED A+
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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS
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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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
QUESTIONS AND ANSWERS 100%
RATED CORRECT WITH 100% SURE
PASS|GRADED A+
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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS
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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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 - CORRECT ANSWERS 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
