CDL COMBINATION VEHICLES Questions with Correct Solutions
Question:
1. Why should you make sure that the fifth wheel plate is greased as required?
Answer:
To prevent steering problems
Question:
2. Under good driving conditions, you should leave at least one second of space between your
vehicle and the vehicle ahead for every ___ feet of your vehicle's length.
Answer:
10
Question:
3. Compared with a straight truck or bus, there are _______ things to inspect in combination
vehicles.
Answer:
More
Question:
4. After you have coupled the trailer, you should start to raise the landing gear by using
Answer:
low gear
Question:
5. At night, when a vehicle is carrying a load that extends four feet or more beyond the rear of
the body, there must be _______ at the extreme end of the load.
Answer:
red lights
Question:
6. When backing a tractor under a trailer, you should expect that
Answer:
the trailer will be slightly lifted when the truck backs underneath it
Question:
7. The air leakage rate for a combination vehicle (engine off, brakes on) should not be more
than ___ psi per minute.
, Answer:
4
Question:
8. You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer
brakes, you should
Answer:
back up gently to ease pressure
Question:
9. When should you use the hand valve to park a combination vehicle?
Answer:
never
Question:
10. Which type of truck-trailer combination has the greatest chance of a "crack-the-whip"
rollover?
Answer:
Tractor pulling three trailers
Question:
11. You are coupling a tractor to a semi-trailer. You have backed up but are not yet under it.
Before backing under the semi-trailer, you should hook up
Answer:
the emergency and service air lines
Question:
12. A tractor with a(n) _______ trailer requires the shortest amount of stopping distance.
Answer:
fully loaded
Question:
13. If you do not do the final air brake check for air leaks and fix them before driving,
Answer:
you could lose your brakes while driving
Question:
14. You should not use the trailer hand valve while driving because
Question:
1. Why should you make sure that the fifth wheel plate is greased as required?
Answer:
To prevent steering problems
Question:
2. Under good driving conditions, you should leave at least one second of space between your
vehicle and the vehicle ahead for every ___ feet of your vehicle's length.
Answer:
10
Question:
3. Compared with a straight truck or bus, there are _______ things to inspect in combination
vehicles.
Answer:
More
Question:
4. After you have coupled the trailer, you should start to raise the landing gear by using
Answer:
low gear
Question:
5. At night, when a vehicle is carrying a load that extends four feet or more beyond the rear of
the body, there must be _______ at the extreme end of the load.
Answer:
red lights
Question:
6. When backing a tractor under a trailer, you should expect that
Answer:
the trailer will be slightly lifted when the truck backs underneath it
Question:
7. The air leakage rate for a combination vehicle (engine off, brakes on) should not be more
than ___ psi per minute.
, Answer:
4
Question:
8. You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer
brakes, you should
Answer:
back up gently to ease pressure
Question:
9. When should you use the hand valve to park a combination vehicle?
Answer:
never
Question:
10. Which type of truck-trailer combination has the greatest chance of a "crack-the-whip"
rollover?
Answer:
Tractor pulling three trailers
Question:
11. You are coupling a tractor to a semi-trailer. You have backed up but are not yet under it.
Before backing under the semi-trailer, you should hook up
Answer:
the emergency and service air lines
Question:
12. A tractor with a(n) _______ trailer requires the shortest amount of stopping distance.
Answer:
fully loaded
Question:
13. If you do not do the final air brake check for air leaks and fix them before driving,
Answer:
you could lose your brakes while driving
Question:
14. You should not use the trailer hand valve while driving because
