CDL COMBINATION VEHICLES

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Author:
RalphFolarin
ID:
190836
Filename:
CDL COMBINATION VEHICLES
Updated:
2012-12-29 17:50:22
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CDL
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CDL COMBINATIONS
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  1. 1. Combination vehicles are usually heavier, longer and require more driving skill than single commercial vehicles.

    A. True B. False
    B. False
  2. More than half of truck driver deaths in crashes are the result of truck rollovers. Trucks turn over easier when fully loaded and are:

    A. Two times more likely to roll over in a crash than empty rigs.
    B. Ten times more likely to roll over in a crash than empty rigs.
    C. Five times more likely to roll over in a crash than empty rigs.
    B. Ten times more likely to roll over in a crash than empty rigs.
    (this multiple choice question has been scrambled)
  3. The following two things will help prevent rollovers.

    A. Keep the cargo close to the front and drive slowly around turns.
    B. Keep the cargo to the back of the rig and drive the speed limit.
    C. Keep the cargo as close to the ground as possible and drive slowly around turns.
    C. Keep the cargo as close to the ground as possible and drive slowly around turns.
    (this multiple choice question has been scrambled)
  4. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?

    A. The rear trailer is twice as likely to turn over as the tractor.
    B. Each trailer is equally likely to turn over as is the tractor.
    C. The front trailer is twice as likly to turn over as the tractor.
    A. The rear trailer is twice as likely to turn over as the tractor.
    (this multiple choice question has been scrambled)
  5. Why should you not use the trailer hand brake to straighten out a jackknifing trailer?

    A. Because the brakes on the trailer wheels cause the skid in the first place.
    B. Because the brakes on the trailer wheels will not respond to the hand brake.
    C. Because the brake handle is too hard to reach.
    A. Because the brakes on the trailer wheels cause the skid in the first place.
    (this multiple choice question has been scrambled)
  6. What is off tracking?

    A. When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels.
    B. When a vehicle goes around a curve and turns back the other way.
    C. When a vehicle goes around a corner, and the driver pulls off the road.
    A. When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels.
    (this multiple choice question has been scrambled)
  7. What is a "trailer jacknife?"

    A. When the wheels of a trailer lock up and the trailer pulls the tractor to a stop.
    B. When the tires on a trailer blow out.
    C. When the wheels of a trailer lock up and the trailer swings around.
    C. When the wheels of a trailer lock up and the trailer swings around. 
    (this multiple choice question has been scrambled)
  8. Should you swing wide to the left before starting a 90 degree turn to the right?

    A. Yes
    B. No
    B. No
  9. Why should you not use the trailer hand valve while driving?

    A. Because of the danger of making the trailer skid.
    B. Because it won't work as well as the foot brake.
    C. Because you should use the parking brake.
    A. Because of the danger of making the trailer skid.
    (this multiple choice question has been scrambled)
  10. Describe what the trailer air supply control does.

    A. It is used to supply the trailer with air, shut the air off, and put on the trailer emergency brakes.
    B. It is a device used to keep the trailer behind the tractor.
    C. It is a yellow, six sided knob used to control the tractor protection valve.
    A. It is used to supply the trailer with air, shut the air off, and put on the trailer emergency brakes.
    (this multiple choice question has been scrambled)
  11. Describe what the service line is for:

    A. To carry air to a relay valve that allows the trailer brakes to be applied quickly.
    B. To carry air to the cab of the rig to cool it.
    C. To carry air to the parking brake to control the trailer brakes.
    A. To carry air to a relay valve that allows the trailer brakes to be applied quickly.
    (this multiple choice question has been scrambled)
  12. What are other names for the Service Air Line?

    A. Curved line or signal line
    B. Control line or signal line
    C. Straight line or control line
    B. Control line or signal line
    (this multiple choice question has been scrambled)
  13. What is the emergency air line?

    A. Air lines connecting the parking brake to the trailer brakes.
    B. Air lines that control the emergency brakes of the tractor. C. Air lines that control the emergency brakes on combination vehicles.
    C. Air lines that control the emergency brakes on combination vehicles.
  14. What is the emergency air line for?

    A. To engage the front brakes of the tractor in case of an emergency.
    B. To engage the trailer brakes in case of air pressure loss. C. To have extra air pressure in case you need it.
    B. To engage the trailer brakes in case of air pressure loss. 
  15. Why should you use chocks when parking a trailer without spring brakes?

    A. Because you don't want the trailer rolling down a hill.
    B. Because if the air pressure leaks away or down, there will be no brakes.
    C. Because some states require chocking of trailer wheels.
    B. Because if the air pressure leaks away or down, there will be no brakes.
    (this multiple choice question has been scrambled)
  16. To prevent rollovers, remember to:

    A. Keep the load centered
    B. Keep the load as low as possible
    C. Go slow around turns
    D. All of the above
    D. All of the above
  17. Large combination vehicles take longer to stop:

    A. When they are loaded
    B. When they are empty
    C. It takes the same time whether empty or loaded
    D. Than bobtail tractors
    B. When they are empty
    (this multiple choice question has been scrambled)
  18. When traveling under 40 mph, you should follow other vehicles:

    A. Only during the day
    B. With a distance of one second for every twenty feet of your vehicle length
    C. With a distance of one second for every ten feet of your vehicle length
    D. As close as possible so others don't cut in
    C. With a distance of one second for every ten feet of your vehicle length
    (this multiple choice question has been scrambled)
  19. The earliest way to notice a trailer skid is:

    A. By hearing the squeal from the tires
    B. By feeling a jerking in the back of the tractor
    C. By feeling the pull on your steering wheel
    D. By seeing it in your mirrors
    D. By seeing it in your mirrors
    (this multiple choice question has been scrambled)
  20. If you start a trailer skid you should:

    A. Release the brakes to get traction back
    B. Step on the brakes quickly
    C. Use the trailer hand brake
    D. Slowly apply pressure to the brakes
    A. Release the brakes to get traction back
    (this multiple choice question has been scrambled)
  21. The trailer hand valve should be used:

    A. Only at highway speeds
    B. Only to test the trailer brakes
    C. Only when parking
    D. Both B & C above
    B. Only to test the trailer brakes
    (this multiple choice question has been scrambled)
  22. Which one of the following statements about tractor protection valves is NOT true?

    A. It keeps air in the tractor in the event the trailer air leaks
    B. When it closes it allows air to leak from the tractor line
    C. It will close automatically if air pressure is low
    D. It is controlled by the trailer air supply valve in the cab
    B. When it closes it allows air to leak from the tractor line
    (this multiple choice question has been scrambled)
  23. The trailer air supply control:

    A. Is a red, square knob
    B. Is a yellow, square knob
    C. Is a red, triangular-shaped knob
    D. Is a red, eight sided knob
    D. Is a red, eight sided knob
    (this multiple choice question has been scrambled)
  24. Which one of the following is controlled by the foot brake?

    A. The hose coupler
    B. The service air line
    C. The emergency air line
    D. The shut off valve
    B. The service air line
    (this multiple choice question has been scrambled)
  25. The service air line is controlled by:

    A. The pressure applied to the line by the foot brake or the trailer hand brake
    B. The relay valve which connects the trailer air tanks to the trailer air brakes
    C. The relay valve which sends air pressure from the trailer air tank to the trailer brake chambers
    D. All of the above
    D. All of the above
  26. A device which connects the service and emergency air lines from the truck to the trailer is called:

    A. Glad hands
    B. Relay switch
    C. Shut off valves
    D. Service couplers
    A. Glad hands
    (this multiple choice question has been scrambled)
  27. When coupling the glad hands, you should NOT do the following:

    A. Match the colors to each other, or read the tags before connecting
    B. Press the two seals together at a 90 degree angle
    C. Cross air supply lines to test them for leaks
    D. Clean the couplers before a connection is made
    C. Cross air supply lines to test them for leaks
    (this multiple choice question has been scrambled)
  28. If you cross connect the two air lines the following will result:

    A. Nothing, the lines are interchangeable
    B. You will not have air going to the trailer brakes
    C. You could not move the tractor
    D. Your tractor brakes will lock up
    B. You will not have air going to the trailer brakes
    (this multiple choice question has been scrambled)
  29. The fifth wheel should be checked to see if:

    A. There is damage or missing parts
    B. It is properly greased
    C. The jaws are open
    D. All of the above
    D. All of the above
  30. When coupling the trailer, back up slowly until:

    A. You can see the rear wheels in the mirror
    B. The fifth wheel just touches the trailer
    C. You hit the front of the trailer with the tractor
    D. The load shifts inside the trailer
    B. The fifth wheel just touches the trailer
    (this multiple choice question has been scrambled)
  31. In order to supply air to the trailer, you must first:

    A. Push in the tractor protection valve.
    B. Cross the air lines to check for leaks
    C. Stop engine so you can hear the brakes
    D. Pull out the "air supply' knob
    C. Stop engine so you can hear the brakes
    (this multiple choice question has been scrambled)
  32. A king pin is:

    A. The pin a driver receives for safe driving
    B. A pin which holds the wheels on the axles
    C. The pin which locks the air brake lines together
    D. A pin which locks the trailer to the tractor on the fifth wheel
    D. A pin which locks the trailer to the tractor on the fifth wheel
    (this multiple choice question has been scrambled)
  33. In order to inspect the coupling you should:

    A. Make sure the fifth wheel jaws are open
    B. Check that the locking lever is in the open position
    C. Make sure there is space between the upper and lower fifth wheel
    D. Use a flashlight if necessary
    D. Use a flashlight if necessary
    (this multiple choice question has been scrambled)
  34. You should crank the landing gear until:

    A. You can clear railroad tracks
    B. It is as far up as it will go
    C. It is six inches off the ground
    D. The crank handle is loose
    B. It is as far up as it will go
    (this multiple choice question has been scrambled)

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