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CDL - SECTION 6: COMBINATION VEHICLES/ QUESTIONS WITH CERTIFIED ANSWERS.

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CDL - SECTION 6: COMBINATION VEHICLES/ QUESTIONS WITH CERTIFIED ANSWERS. Why should you NOT use the trailer hand valve while driving? - Answer: The danger of making the trailer skid. Describe what the trailer air supply control does. - Answer: Push in -- Supply air to trailer; Push out -- Shut air off and put on trailer emergency brakes Describe what the service line is for. - Answer: Carries air, which is controlled by the foot brake or the trailer hand brake. What is the emergency air line for? - Answer: Supplies air to the trailer air tanks; Controls the emergency brakes on combination vehicles. Why should you use chocks when parking a trailer without spring brakes? - Answer: To keep the trailer from moving. Where are the shut-off valves? - Answer: Back of trailer.

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CDL - SECTION 6: COMBINATION VEHICLES\\\\
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CDL - SECTION 6: COMBINATION VEHICLES\\\\

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CDL - SECTION 6: COMBINATION VEHICLES/
QUESTIONS WITH CERTIFIED ANSWERS.

Why should you NOT use the trailer hand valve while driving? - Answer: The

danger of making the trailer skid.



Describe what the trailer air supply control does. - Answer: Push in -- Supply air to

trailer; Push out -- Shut air off and put on trailer emergency brakes



Describe what the service line is for. - Answer: Carries air, which is controlled by

the foot brake or the trailer hand brake.

Page 1 of 5

, What is the emergency air line for? - Answer: Supplies air to the trailer air tanks;

Controls the emergency brakes on combination vehicles.



Why should you use chocks when parking a trailer without spring brakes? -

Answer: To keep the trailer from moving.



Where are the shut-off valves? - Answer: Back of trailer.



What might happen if the trailer is too high when you try to couple? - Answer: It

may not couple correctly.



What two things are important to prevent rollover? - Answer: Keep cargo as close

to the ground as possible and drive slowly around turns.



When you turn suddenly while pulling doubles, which trailer is most likely to turn

over? - Answer: The rear trailer is twice as likely to turn over.




Page 2 of 5

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CDL - SECTION 6: COMBINATION VEHICLES\\\\

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