Contents
- 1 When turning a corner with a tractor trailer trailer rear wheels follow?
- 2 What are the things on the back of tractor of a semi truck?
- 3 What is the crack-the-whip effect?
- 4 When backing a tractor under a trailer you should?
- 5 What are two types of jackknife?
- 6 When you turn suddenly while pulling doubles which trailer is more likely to turn over?
- 7 What is the back of a semi called?
- 8 What is the back of a delivery truck called?
- 9 What is the back of the truck called?
- 10 When connecting the glad hands press the two seals?
- 11 What are the types of jackknife?
- 12 Which vehicle will off track the most?
- 13 When you get ready to back under the semi trailer you should line up?
- 14 What might happen if the trailer is too high?
- 15 What happens when you cross the air lines of an older trailer without spring brakes?
When turning a corner with a tractor trailer trailer rear wheels follow?
Turn Wide. When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is called “offtracking” or “cheating.” Figure 6-4 to the right shows how offtracking causes the path followed by a tractor -semi to be wider than the rig itself. Longer vehicles will offtrack more.
What are the things on the back of tractor of a semi truck?
A trailer tail, boat tail, or rear fairing is an aerodynamic device intended to improve the fuel economy of semi-trailer trucks.
What is the crack-the-whip effect?
Trucks with trailers have a dangerous “ crack-the-whip ” effect. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. There are many accidents where only the trailer has overturned. “Rearward amplification” causes the crack-the-whip effect.
When backing a tractor under a trailer you should?
CDL
| Question | Answer |
|---|---|
| When backing a tractor under a trailer you should ___________. | Always use the lowest reverse gear. |
| After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what posistion? | Normal position. |
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What are two types of jackknife?
The 2015 South Carolina Commercial Driver License Manual makes the key distinction between two types of jackknife: a tractor jackknife and a trailer jackknife. In both cases, the root cause is the same: braking too hard causes wheels to lose their grip on the road.
When you turn suddenly while pulling doubles which trailer is more likely to turn over?
When you turn suddenly while pulling doubles, which trailer is most likely to turn over? The rear trailer is twice as likely to turn over as the tractor. The front trailer is twice as likely to turn over as the tractor. Each trailer is equally likely to turn over as is the tractor.
What is the back of a semi called?
A large proportion of a semi -trailer’s weight is supported by a tractor unit, or a detachable front-axle assembly known as a dolly, or the tail of another trailer.
What is the back of a delivery truck called?
Cargo box sits in the frame (chassis) and can’t be accessed from the cabin. This means it is a two-piece vehicle. Cargo area usually has only rear doors, but it’s possible to find models with side doors.
What is the back of the truck called?
The back of the truck where the goods are placed is called a cargo bed. The cargo bed may be covered with a tonneau cover made of cloth, metal or plastic, to protect the cargo from rain and dirt. Pickup trucks are easy to load and unload.
When connecting the glad hands press the two seals?
When connecting the glad hands, press the two seals together with the couplers at a 90 degree angle to each other. A turn of the glad hand attached to the hose will join and lock the couplers. If you do cross the air lines, supply air will be sent to the service line instead of going to charge the trailer air tanks.
What are the types of jackknife?
There are two main types of jack-knife trucking accidents: “Classic” Jack-Knife Accidents – This is when the truck’s cab spins into the trailer. This usually happens when a truck slams on the brakes and cannot recover in time to stop the trailer from swinging out.
Which vehicle will off track the most?
When a vehicle goes around a corner, the rear wheels follow a different path. Each wheel takes a “shortcut.” This “shortcut” is called off – tracking (or, “cheating”). The last wheels off – track the most. Long trailers will off – track more than short trailers.
When you get ready to back under the semi trailer you should line up?
4. When you get ready to back under the semi trailer you should line up: A About 12 degrees off the line of the trailer.
What might happen if the trailer is too high?
What might happen if the trailer is too high when you try to couple? If the trailer is too low, the tractor may stike and damage the trailer nose; if the trailer is too high, it may not couple correctly. If there is space something is wrong and the trailer would come loose very easily.
What happens when you cross the air lines of an older trailer without spring brakes?
You cross the air lines when hooking up to an old trailer. What will happen? If the trailer has no spring brakes, you could drive away buy you wouldn’t have trailer brakes. In normal driving, some drivers use the trolley (hand) valve before the brake pedal in order to prevent trailer skids.