Term
| Is a big load with higher center of gravity more likely to roll over than a empty load? |
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Definition
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Term
| 2 things to help prevent a rollover |
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Definition
keep cargo as close to ground as possible
drive slowly around turns |
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Term
| What is the crack the whip effect |
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Definition
| rearward amplification or when you make a quick lane change, can cause a trailer to roll over |
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Term
| What is more likely to rollover triple 27ft trailers or double 45ft trailers |
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Definition
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Term
| How far behind do you want to be behind a vehicle while following it |
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Definition
| at least 1 second for each 10 feet of your vehicle, plus another second if your going over 40 mph |
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Term
| Does it take a large combination vehicle thats fully loaded longer to stop than an empty one and why |
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Definition
no
when the trailer is empty your stiff suspension and strong brakes give poor traction and makes it easier to lock up wheels. |
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Term
It is easier to jackknife an empty trailer vs full trailer
true false |
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Definition
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Term
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Definition
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Term
| does it take a bobtail longer to stop vs tractor with loaded trailer |
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Definition
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Term
| While in a combination vehicle why do you want to allow lots of following distance and look far ahead |
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Definition
| so you can brake early and not be caught by surprise |
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Term
| why can railroad highway crossings cause a problem |
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Definition
| if you are pulling a trailer with low underneath clearance it may get stuck |
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Term
| types of trailers that may get stuck on railroad crossings |
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Definition
| low slung units such as lowboy, car carrier, moving van, livestock trailer. |
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Term
| What is a trailer jackknife and where does it mostly occur |
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Definition
| when wheels of trailer lock up and trailer swings around occurs more often with light/empty loads |
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Term
| how to prevent a jackknife |
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Definition
| check your mirrors anytime you brake hard as trailer may swing out |
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Term
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Definition
| stop using the brake and release the brakes to regain traction and then it will straighten out |
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Term
| why do you not use the trailer hand brake during a jackknife |
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Definition
| because the brakes cause the skid in the first place |
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Term
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Definition
| when a vehicle make a turn and its rear wheels do not follow the same path as its front wheels |
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Term
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Definition
| low speed off tracking and high speed off tracking |
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Term
| Why do you want to be close to the curb while turning right |
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Definition
| keeps other drivers from passing you on the right and getting caught between you and the curb |
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Term
| can you utilize the on-coming traffic lane if you cannot complete a turn without entering another traffic lane |
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Definition
| yes as long as there is no traffic |
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Term
| 2 factors of off-tracking |
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Definition
distance from tractor fifth wheel and trailer kingpin attachment to the center of the trailer rear axle group
Amount of sideway drag of the rear tires |
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Term
| Why do 28 ft doubles and triples have better off tracking performance than a standard single 53 foot trailer |
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Definition
| because they have multiple pivot points and have shorter wheelbases |
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Term
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Definition
| amount of roadway space a truck needs to make the turn without hitting something |
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Term
| combination with worse off tracking characteristics is what |
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Definition
| turnpike double with 2 53 foot trailers |
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Term
| which way do you turn the steering wheel while backing up a trailer |
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Definition
| in the opposite direction |
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Term
| When backing up a trailer do you want to position it so you can back in straight |
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Definition
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Term
| if you must back into a curved path which way shall you back up |
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Definition
| back up to the driver side so you can see |
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Term
| steering with your hand on the bottom of the wheel makes backing a trailer easier true or false |
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Definition
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Term
| Steps to take while backing a trailer |
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Definition
1. Look at your path - check the line of travel, walk around the vehicle and check clearances.
2. Use mirrors and both sides - check the outside mirrors and both sides frequently
3. Back slowly - allows you to make corrections as you move
4. Correct drift immediately - correct the trailer when it gets off the path
5. Pull forward - make pull ups to reposition if needed |
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Term
| Trailer hand valve operates what |
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Definition
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Term
| when should trailer hand valve should be used |
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Definition
| only to test the trailer brakes otherwise it make cause the trailer to skid |
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Term
| what do the foot brakes do |
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Definition
| sends air to all of the brakes on the vehicle, trailer and tractor. |
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Term
| What happens if you dont have trailer parking brakes while parking a trailer |
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Definition
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Term
| what is the tractor protection valve |
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Definition
| keeps air in the tractor or truck brake system if the trailer broke away or developed a leak. |
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Term
| when does the tractor protection valve automatically close |
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Definition
| if the pressure is to low in the range of 20 to 45 psi |
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Term
| what happens when the protection valve comes on what happens |
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Definition
| stops any air from going out of the tractor and lets air out of the trailer emergency line which causes the trailer emergency brakes to come on. |
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Term
| Trailer air supply control is what color |
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Definition
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Term
| pushing in the trailer air supply control knob does what |
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Definition
| supplies the trailer with air |
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Term
| pulling out the trailer air supply control knob does what |
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Definition
| shut the air off and put on the emergency brakes |
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Term
| When does the trailer air supply control automatically pop out |
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Definition
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Term
| 2 types and colors of air lines associated with trailers |
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Definition
blue - service line
red - emergency line |
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Term
| what line carries air to the trailer that is controlled by the foot brake or trailer hand brake |
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Definition
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Term
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Definition
| control the pressure of the brakes depending on how hard you press it |
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Term
| What line supplies air to the trailer air tanks and control emergency brakes |
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Definition
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Term
| When does emergency brakes come on |
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Definition
| when the emergency line loses pressure and the knob pops out |
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Term
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Definition
| coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer |
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Term
| what happens if you cross the air lines(connect service to emergency and vice versa) |
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Definition
| supply air will be sent to the service line instead of going the trailer air tanks and wont be able to release spring brakes |
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Term
| what happens if you drive away with crossed lines |
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Definition
| you wont have trailer brakes |
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Term
| dead end or dummy couplers are what |
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Definition
| couplers attached to lines to prevent dirt and water getting into them |
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Term
| which trailer is more likely to fishtail while pulling doubles |
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Definition
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Term
| Why is it important to drain your air tanks every day |
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Definition
| moisture builds up and brakes may not function correctly |
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Term
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Definition
| closes air lines off when trailer isnt being towed |
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Term
| where are shut off valves located |
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Definition
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Term
| all trailers built after 1998 required to have waht |
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Definition
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Term
| how do you know if the trailer has abs |
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Definition
| yellow abs lamps on left or front and or of the corner |
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Term
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Definition
| doesn't affect normal braking, comes on when wheels are about to lock up while braking |
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Term
| do you have normal brake function if abs fails |
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Definition
| yes, but drive to nearest shop imediately |
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Term
| do you need to keep fifth wheel greased |
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Definition
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Term
| why does the fifth wheel need to be grease |
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Definition
| can cause steering problems because of friction between trailer and tractor |
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Term
| which way do you want fifth wheel tilted |
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Definition
| towards the rear of the tractor |
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Term
| do you want the brakes to be locked while coupling tractor and trailer |
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Definition
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Term
| how do you want the tractor positioned while coupling to trailer |
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Definition
| directly in front of the trailer never under at an angle due to possibility of pushing trailer sideways |
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Term
| when you start backing up to conect trailer when do you stop |
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Definition
| stop when fifth wheel just touches the trailer |
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Term
| why do you stop and not go all the way with tractor |
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Definition
| to check and make sure trailer is at ideal height and kingpin and fifth wheel is lined up and so you can also hook up air lines |
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Term
| what gear do you use while backing up into trailer |
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Definition
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Term
| do you want any gap between trailer and fifth wheel |
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Definition
| no you want no daylight in between |
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Term
| you use low gear range to raise landing gear if available and then once free of weight switch to high gear true or false |
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Definition
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Term
| how high do you want to raise landing gear |
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Definition
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Term
| if trailer is loaded how much do you want to crank the landing gear |
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Definition
| turn landing gear till contact with ground than turn about 7 extra turns |
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Term
| what may happen if trailer is too high while coupling |
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Definition
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