CDL-COMBINATIONVEHICLEPRACTICE b b b b
TEST QUESTIONS WITH CORRECT b b b b
ANSWERS2026//2027 b
A tractor with a(n)
b b b b trailer requires the shortest amount of stopping distance .
b b b b b b b b b
1. empty
2. fully loaded b
3. lightly loaded - CORRECT ANSWER-fully loaded
b b b b b
The air leakage rate for a combination vehicle ( engine off, brakes on) should not be more t
b b b b b b b b b b b b b b b b b
han
b psi per minute .
b b b b
1. 4 b
2. 6 b
3. 2 - CORRECT ANSWER-4
b b b b
If you do not do the final air brake check for air leaks and fix them before driving,
b b b b b b b b b b b b b b b b b
1. you could lose your brakes while driving
b b b b b b
2. your fuel usage will increase b b b b
3. tire pressure will drop - CORRECT ANSWER-you could lose your brakes while driving
b b b b b b b b b b b b
Which part of the kingpin should the locking jaws close around? - CORRECT ANSWER-
b b b b b b b b b b b b b
The shank
b b
Glad hands are used to connect the ....
b b b b b b b
1. kingpin from the trailer to the locking jaws of the fifth wheel
b b b b b b b b b b b
2. electrical lines from the tractor to the trailer b b b b b b b
, 3. service and emergency air lines from the truck or tractor to the trailer -
b b b b b b b b b b b b b
CORRECT ANSWER-service and emergency air lines from the truck or tractor to the trailer
b b b b b b b b b b b b b
Trucks roll over more easily when fully loaded and are
b b b b b b b b b
1. ten times more likely to roll over in a crash than empty rigs
b b b b b b b b b b b b
2. five times more likely to roll over in a crash than empty rigs
b b b b b b b b b b b b
3. two times more likely to roll over in a crash than empty rigs - CORRECT ANSWER-
b b b b b b b b b b b b b b b
ten times more likely to roll over in a crash than empty rigs
b b b b b b b b b b b b b
In general, the higher your trucks center of gravity, the ...
b b b b b b b b b b
1. easier it is to turn over b b b b b
2. more stable it is when turning b b b b b
3. easier it is to turn around corners - CORRECT ANSWER-easier it is to turn over
b b b b b b b b b b b b b b
You are driving a combination vehicle when the trailer breaks away, pulling apart both air li
b b b b b b b b b b b b b b b
nes. You would expect the trailer brakes to come on and ...
b b b b b b b b b b b b
1. the tractor to lose all air pressure
b b b b b b
2. the tractor protection valve to close
b b b b b
3. the trailer supply valve to stay open - CORRECT ANSWER-
b b b b b b b b b
the tractor protection valve to close
b b b b b b
When you drive a set of doubles, which shut-off valve must be closed in the last trailer?
b b b b b b b b b b b b b b b b
1. Middle section b
2. front section b
3. back section - CORRECT ANSWER-back section
b b b b b
TEST QUESTIONS WITH CORRECT b b b b
ANSWERS2026//2027 b
A tractor with a(n)
b b b b trailer requires the shortest amount of stopping distance .
b b b b b b b b b
1. empty
2. fully loaded b
3. lightly loaded - CORRECT ANSWER-fully loaded
b b b b b
The air leakage rate for a combination vehicle ( engine off, brakes on) should not be more t
b b b b b b b b b b b b b b b b b
han
b psi per minute .
b b b b
1. 4 b
2. 6 b
3. 2 - CORRECT ANSWER-4
b b b b
If you do not do the final air brake check for air leaks and fix them before driving,
b b b b b b b b b b b b b b b b b
1. you could lose your brakes while driving
b b b b b b
2. your fuel usage will increase b b b b
3. tire pressure will drop - CORRECT ANSWER-you could lose your brakes while driving
b b b b b b b b b b b b
Which part of the kingpin should the locking jaws close around? - CORRECT ANSWER-
b b b b b b b b b b b b b
The shank
b b
Glad hands are used to connect the ....
b b b b b b b
1. kingpin from the trailer to the locking jaws of the fifth wheel
b b b b b b b b b b b
2. electrical lines from the tractor to the trailer b b b b b b b
, 3. service and emergency air lines from the truck or tractor to the trailer -
b b b b b b b b b b b b b
CORRECT ANSWER-service and emergency air lines from the truck or tractor to the trailer
b b b b b b b b b b b b b
Trucks roll over more easily when fully loaded and are
b b b b b b b b b
1. ten times more likely to roll over in a crash than empty rigs
b b b b b b b b b b b b
2. five times more likely to roll over in a crash than empty rigs
b b b b b b b b b b b b
3. two times more likely to roll over in a crash than empty rigs - CORRECT ANSWER-
b b b b b b b b b b b b b b b
ten times more likely to roll over in a crash than empty rigs
b b b b b b b b b b b b b
In general, the higher your trucks center of gravity, the ...
b b b b b b b b b b
1. easier it is to turn over b b b b b
2. more stable it is when turning b b b b b
3. easier it is to turn around corners - CORRECT ANSWER-easier it is to turn over
b b b b b b b b b b b b b b
You are driving a combination vehicle when the trailer breaks away, pulling apart both air li
b b b b b b b b b b b b b b b
nes. You would expect the trailer brakes to come on and ...
b b b b b b b b b b b b
1. the tractor to lose all air pressure
b b b b b b
2. the tractor protection valve to close
b b b b b
3. the trailer supply valve to stay open - CORRECT ANSWER-
b b b b b b b b b
the tractor protection valve to close
b b b b b b
When you drive a set of doubles, which shut-off valve must be closed in the last trailer?
b b b b b b b b b b b b b b b b
1. Middle section b
2. front section b
3. back section - CORRECT ANSWER-back section
b b b b b
