CDL COMBINATION VEHICLE EXAM, PRACTICE EXAM
AND STUDY GUIDE NEWEST 2024 ACTUAL EXAM 300
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
(VERIFIED ANSWERS) |ALREADY GRADED A+
Where should the tractor be when you inspect landing gear after uncoupling the
trailer? - ANSWER: With the tractor frame under the trailer
While driving behind other vehicle under good condition you should allow at least
one second between your vehicle and the vehicle ahead for each _____ ( how many)
feet of your vehicle length? - ANSWER: 10
There are two things that a driver can do to prevent a rollover. They are (1) keep the
cargo as close to the ground as possible and (2) ? - ANSWER: Go slow around turns
The air brake leakage rate for a combination vehicle (engine off, brakes off) should
be less than ____ psi per minute? - ANSWER: 4
The safest way to make turn without entering another traffic lane is? - ANSWER: You
should turn wide as you complete the turn
The higher the center of gravity of your truck the? - ANSWER: Easier to turn over
If the service line comes apart while you are driving a combination vehicle but the
emergency line stays together, what will happen right away? - ANSWER: Nothing is
likely to happen until you try to apply the brakes
Glad hands are usually connecting which of these? - ANSWER: Service and
emergency air line from the vehicle to the trailer
A driver crosses air lines when hooking up to an older trailer. What will happen? -
ANSWER: If the trailer has no spring brakes, you could drive away but you would
have the trailer brakes
The hand valve should be used to? - ANSWER: To test the trailer brakes
When driving a set of doubles it is necessary to close which shut-off valve in the last
trailer? - ANSWER: Back
You are about to back your tractor under the semitrailer. The trailer is at the height
when the? - ANSWER: Trailer will be lifted slightly when the tractor backs under it
Your emergency air line brakes or gets pulled apart while your driving. The loss of
pressure will cause the? - ANSWER: Emergency trailer brakes to come on
AND STUDY GUIDE NEWEST 2024 ACTUAL EXAM 300
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
(VERIFIED ANSWERS) |ALREADY GRADED A+
Where should the tractor be when you inspect landing gear after uncoupling the
trailer? - ANSWER: With the tractor frame under the trailer
While driving behind other vehicle under good condition you should allow at least
one second between your vehicle and the vehicle ahead for each _____ ( how many)
feet of your vehicle length? - ANSWER: 10
There are two things that a driver can do to prevent a rollover. They are (1) keep the
cargo as close to the ground as possible and (2) ? - ANSWER: Go slow around turns
The air brake leakage rate for a combination vehicle (engine off, brakes off) should
be less than ____ psi per minute? - ANSWER: 4
The safest way to make turn without entering another traffic lane is? - ANSWER: You
should turn wide as you complete the turn
The higher the center of gravity of your truck the? - ANSWER: Easier to turn over
If the service line comes apart while you are driving a combination vehicle but the
emergency line stays together, what will happen right away? - ANSWER: Nothing is
likely to happen until you try to apply the brakes
Glad hands are usually connecting which of these? - ANSWER: Service and
emergency air line from the vehicle to the trailer
A driver crosses air lines when hooking up to an older trailer. What will happen? -
ANSWER: If the trailer has no spring brakes, you could drive away but you would
have the trailer brakes
The hand valve should be used to? - ANSWER: To test the trailer brakes
When driving a set of doubles it is necessary to close which shut-off valve in the last
trailer? - ANSWER: Back
You are about to back your tractor under the semitrailer. The trailer is at the height
when the? - ANSWER: Trailer will be lifted slightly when the tractor backs under it
Your emergency air line brakes or gets pulled apart while your driving. The loss of
pressure will cause the? - ANSWER: Emergency trailer brakes to come on
