Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Combination Vehicle
| Question | Answer |
|---|---|
| What will happen if the airline are crossed when you hook up to an old trailer with no spring brakes? | You could drive away with no trailer brakes. |
| When should you use the hand valve to park a combination vehicle? | Never. |
| The fifth wheel locking lever is not locked after the jaws close around the kingpin. What does this mean? | That the coupling is not right and should be fixed before driving the coupled unit. |
| What two things can a driver do to prevent a rollover? | To keep the cargo as close to the ground as possible and go slow around turns. |
| Your emergency air line breaks or gets pulled apart while you are driving. What will the loss of pressure cause? | Causes the emergency trailer brakes to come on. |
| What does the 5-axle tractor towing a 52-foot trailer do the most? | Off-tracks |
| After you have coupled the trailer, how should you begin raising the landing gear? | By using the low gear. |
| When checking that the trailer is securely coupled to the tractor, how should the landing gear be? | It should be slightly raised. |
| What should you do to stop a trailer skid? | Release the brakes. |
| How much space should be between the upper and lower fifth wheel after coupling? | None. |
| How do you know if the trailer you are driving has antilock brakes? | There are yellow ABS malfunction lights on the left side of the trailer. |
| After you connect the airlines, but BEFORE you back under the trailer, what should you do? | Supply air to the trailer system, then pull out the air supply knob. |
| What do semitrailers made before 1975 that are equipped with air brakes not have? | They often do not have spring brakes. |
| What type of tractor trailer requires the shortest stopping distance? | A fully loaded trailer. |
| Before backing under a trailer, what should you make sure is locked? | The trailer brakes. |
| If you are coupling a tractor and a semitrailer and have connected the airlines, what should you do before backing under the trailer? | Supply to the trailer system, then pull out the air supply knob to lock the trailer brakes. |
| When the front trailer supports are up and the trailer is resting on the tractor, what should you make sure of next? | There is enough clearance between the tractor frame and the landing gear. |
| What configuration of a tractor-trailer vehicle combination is most likely to roll over in a turn? | Triple 27-foot trailers. |
| When checking the trailer's emergency brakes, what position should the tractor protection control valve be placed in? | In the emergency position. |
| How shoul you test the tractor-semitrailer connection for security? | Pull gently forward in low gear against the locked trailer brakes. |
| When driving a set of doubles, how do you close the shut-off valve in the last trailer? | Shut if off back. |
| How do you supply air to the trailer tanks? | By pushing in the trailer air supply control valve. |
| If you can make a turn without entering another traffic lane, how should you do it? | Turn wide as you complete your turn. |
| How much space should be between the upper and lower 5th wheel after coupling? | None. |
| What shoud you do after connecting the airlines, but BEFORE you back under the trailer? | Supply air to the trailer system, then pull the air supply knob. |
| Air lines on a combination vehicle are often colored to keep from getting them mixed up. What colors are the emergency line and service line? | Emergency line is red. Service line is blue. |
| What two things can a driver do to prevent a rollover? | Keep the cargo as close to the ground as possible and go slow around turns. |
| If the spring brakes don't release when you push the trailer air supply control, what should you do? | Check the air line connections. |
| What should you do if you vehicle gets stuck on a raised railroad highway crossing? | Get out of the vehicle and away from the tracks. |
| When connecting the glad hands, what degree angle should you press the two seals of the couplers together? | 90 degrees |
| When checking the trailers emergency brakes, what position should the tractor protections control valve be in? | Emergency. |
| If you have coupled with a semi-trailer, where should the front trailer supports be before driving away? | Fully raised with the crank handle secured in its bracket. |
| What configuration of a tractor-trailer vehicle combination is most likely to roll over in a turn? | Triple 27-foot trailers |
| The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in which brake line? | Emergency brake line. |
| What does loss of air pressure in the emergency line cause? | Causes the trailer's emergency brakes to come on. |
| Compared to a straight truck or bus, are there more or less things to inspect on a combination vehicle? | More. |
| After the trailer has been coupled to the tractor, what position should the tractor protection control valve be in? | Normal. |
| When checking that the trailer is securely coupled to the tractor, how should the landing gear be? | Slightly raised. |
| What is the best way to tell if you trailer has started to skid? | See it in your mirrors. |
| The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak ion which brake line? | Emergency |
| After you have coupled the trailer, how should you begin traising the landing gear? | By using the low gear. |
| The trailer air supply control (or tractor protection valvle control) should automatically close when the air pressure falls between what psi? | 20-45 psi |
| Why should you lock the air glad hands to each other (or dummy couplers) when you are not towing a trailer? | It will keep water out of the lines. |
| When should you use the hand valve before stepping on the brake pedal in order to prevent a jackknife in normal driving? | It should not be done. |
| What type of tractor trailer requires the shortest stopping distance? | A fully loaded one. |
| How do you supply air to the trailer tanks? | By pushing in the trailer air supply control valve. |
| When the front trailer supports are up and the trailer is resting on the tractor, what should you make sure to check? | That there is enough clearance between the tractor frame and the landing gear. |
| What color are the air lines on a combination vehicle? | Emergency line is red. Service line is blue. |
| A tractor-trailer vehicle combination that is most likely to roll over in a turn includes what configuration? | Triple 27-foot trailers |
| When uncoupling a loaded trailer, how far should you lower the landing gear? | Until it makes firm contact with the ground. |
| When is a trailer most likely to jackknife? | When it is empty. |
| When should the hand valve be used? | To test the trailer brakes. |
| What does it mean when the fifth wheel locking lever is not locked after the jaws close around the kingpin? | That the coupling is not right and should be fixed before the coupled unit. |
| How much space should be between the upper and lower fifth wheel after coupling? | None. |
| What will having only antilock brakes on your trailer give you? | Gives more control over the vehicle when braking. |
| When connecting the glad hands, what degree angle do you press the two seals of the couplers together at? | 90 degrees |
| When should you get out of your vehicle when backing with a trailer? | When you are unsure of your path of travel. |
| What should you do after you connect the air lines, but BEFORE you back under a trailer? | Supply air to the trailer system, then pull out the air supply knob. |
| What is the best way to tell if your trailer has started to skid? | See it in the mirrors. |
Created by:
user-2034175