Nj CDL Combination Exam Questions And
Answers
The Air leakage rate for a combination vehicle should not be more
than how many psi per minute? -
correct answer ✅4
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 vehicles length -
correct answer ✅10
Semi trailers made before 1975 that are equipped with air brakes
often do not have -
correct answer ✅Spring breaks
Air lines on a combination vehicle are often colored to keep them
from getting mixed up. The emergency line is ___; the service line is
____ -
correct answer ✅Red ; Blue
If the brakes did not release when you pushed the trailer air supply
valve, you should? -
correct answer ✅check the air line connections
, Nj CDL Combination Exam Questions And
Answers
How do you supply air to the trailer tanks? -
correct answer ✅by pushing in the trailer air supply valve
What are the other names for the service air line? -
correct answer ✅Control line and signal line
When you turn suddenly while pulling doubles, which trailer is most
likely to turn over? -
correct answer ✅The rear trailer is twice as likely to turn over as
the tractor
After you have coupled the trailer, you should start to raise the
landing gear by using? -
correct answer ✅Low Gear
What gear should the tractor engine be in after you uncouple the
trailer and are inspecting the trailer supports? -
correct answer ✅Neutral
Describe what the trailer air supply control does -
correct answer ✅It is used to supply the trailer with air, shut the
air off, and apply the trailer emergency brakes
Answers
The Air leakage rate for a combination vehicle should not be more
than how many psi per minute? -
correct answer ✅4
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 vehicles length -
correct answer ✅10
Semi trailers made before 1975 that are equipped with air brakes
often do not have -
correct answer ✅Spring breaks
Air lines on a combination vehicle are often colored to keep them
from getting mixed up. The emergency line is ___; the service line is
____ -
correct answer ✅Red ; Blue
If the brakes did not release when you pushed the trailer air supply
valve, you should? -
correct answer ✅check the air line connections
, Nj CDL Combination Exam Questions And
Answers
How do you supply air to the trailer tanks? -
correct answer ✅by pushing in the trailer air supply valve
What are the other names for the service air line? -
correct answer ✅Control line and signal line
When you turn suddenly while pulling doubles, which trailer is most
likely to turn over? -
correct answer ✅The rear trailer is twice as likely to turn over as
the tractor
After you have coupled the trailer, you should start to raise the
landing gear by using? -
correct answer ✅Low Gear
What gear should the tractor engine be in after you uncouple the
trailer and are inspecting the trailer supports? -
correct answer ✅Neutral
Describe what the trailer air supply control does -
correct answer ✅It is used to supply the trailer with air, shut the
air off, and apply the trailer emergency brakes
