CLP/CDL Combination Vehicles Test Exam
Questions With Verified Answers
What two things are important to prevent rollover? (6.1.1) - answer✔1. Keep cargo as close to
the ground as possible
2. Drive slowly around turns
When you turn suddenly while pulling doubles, which trailer is most likely to turn over? (6.1.2) -
answer✔The rear most trailer
What is the "crack-the-whip" effect? (6.1.2) - answer✔When you make a quick lane change or
sudden movement of your steering wheel, the rear trailer tends to swing out. The force of the rear
trailer becomes amplified, causing it to roll over (rearward amplification).
What is the proper following distance formula? (6.1.2) - answer✔Maintain at least 1 second of
following distance for each 10 feet of your vehicle length.
Add 1 second for speeds above 40mph.
Large combination vehicles take longer to stop when they are ______ than when they are
_______. (6.1.3) - answer✔EMPTY
FULLY LOADED
Why should you not use the trailer hand brake to straighten out a jackknifing trailer? (6.1.5) -
answer✔Because the brakes on the trailer wheels caused the skid in the first place. Once the
trailer wheels grip the road again, the trailer will start to follow the tractor and straighten out.
What type of trailers can get stuck on railroad-highway crossings? (6.1.4) - answer✔- Low slung
trailers, like car carriers, moving vans, and possum-belly livestock trailers
- Single-axle tractor pulling a long trailer with its landing gear set to accommodate a tandem-axle
tractor
How do you stop a trailer skid / jackknife? (6.1.5) - answer✔1. Recognize the skid by looking at
your mirrors when braking to make sure that it is where it should be
2. Release the brakes to get traction back. Once the trailer wheels grip the road again, the trailer
will start to follow the tractor and straighten out.
What is off tracking? (6.1.6) - answer✔When the rear wheels follow a different path than the
front wheels when a vehicle goes around a corner. Refer to Figures 6.3 & 6.4
What should you do if you cannot complete your turn without entering another traffic lane?
(6.1.6) - answer✔Turn wide as you complete the turn. This is better than swinging wide to the
left before starting the turn because it will keep other drivers from passing you on the right. If
drivers pass on the right, you may collide with them when you turn.
When you back a trailer, you should position your vehicle so you can back in a curved path to
the DRIVER'S SIDE. True or False? (6.1.7) - answer✔TRUE! Backing to the driver's side
allows you to see your path better through the mirrors.
When you back a trailer, you should position your vehicle so you can back in a straight line. True
or False? (6.1.7) - answer✔TRUE!
Why should you not use the trailer hand valve while driving? (6.2.1) - answer✔Because of the
danger of making the trailer skid! It should only be used to test the trailer service brakes.
Which set of brakes sends air to all the brakes on the vehicle and the trailer(s)? (6.2.1) -
answer✔The foot brake.
There is much less danger of causing a skid or jackknife when using just the foot brake.
Why should you use wheel chocks when parking a trailer without spring brakes? (6.2.1) -
answer✔Because if the air pressure leaks away, there will be no brakes.
Never use the hand valve for parking because all the air might leak out, unlocking the brakes (in
trailers that do not have spring brakes.) Always use the parking brakes when parking. If the
trailer does not have spring brakes, use wheel chocks to keep the trailer from moving.
What does the tractor protection valve do? (6.2.2) - answer✔Keeps air in the tractor or truck
brake system should the trailer and break away or develop a bad leak
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Brainbarter. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
