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CDL - Combination Vehicle Practice Test Questions and Answers (Latest Update 2024) 40 Quest
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CDL - Combination Vehicle Practice Test Questions and Answers (Latest Update 2024) 40 Quest
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CDL - Combination Vehicle Practice TestQuestions and Answers (Latest Update
2024) 40 Quest
A tractor with a(n) ________ trailer requires the shortest amount of stopping
distance .
1. empty
2. fully loaded
3. lightly loaded - Correct Answer ✅ fully loaded
The air leakage rate for a combination vehicle ( engine off, brakes on) should
not be more than _____ psi per minute .
1. 4
2. 6
3. 2 - Correct Answer ✅ 4
If you do not do the final air brake check for air leaks and fix them before
driving,
1. you could lose your brakes while driving
2. your fuel usage will increase
3. tire pressure will drop - Correct Answer ✅ you could lose your brakes
while driving
Which part of the kingpin should the locking jaws close around? - Correct
Answer ✅ The shank
Glad hands are used to connect the ....
1. kingpin from the trailer to the locking jaws of the fifth wheel
2. electrical lines from the tractor to the trailer
3. service and emergency air lines from the truck or tractor to the trailer -
Correct Answer ✅ service and emergency air lines from the truck or
tractor to the trailer
, CDL - Combination Vehicle Practice Test
Questions and Answers (Latest Update
2024) 40 Quest
Trucks roll over more easily when fully loaded and are
1. ten times more likely to roll over in a crash than empty rigs
2. five times more likely to roll over in a crash than empty rigs
3. two times more likely to roll over in a crash than empty rigs - Correct
Answer ✅ ten times more likely to roll over in a crash than empty rigs
In general, the higher your trucks center of gravity, the ...
1. easier it is to turn over
2. more stable it is when turning
3. easier it is to turn around corners - Correct Answer ✅ easier it is to turn
over
You are driving a combination vehicle when the trailer breaks away, pulling
apart both air lines. You would expect the trailer brakes to come on and ...
1. the tractor to lose all air pressure
2. the tractor protection valve to close
3. the trailer supply valve to stay open - Correct Answer ✅ the tractor
protection valve to close
When you drive a set of doubles, which shut-off valve must be closed in the
last trailer?
1. Middle section
2. front section
3. back section - Correct Answer ✅ back section
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