CDL Combo Test Exam Questions and
Answers
A kingpin is: -
correct answer ✅A pin on the trailer that locks it to the tractor 5th
wheel
A tractor with a ____ trailer requires the shortest amount of
stopping distance. -
correct answer ✅Fully loaded
A trailer is most likely to jackknife when it is: -
correct answer ✅Empty
A trailer is most likely to roll over when it is: -
correct answer ✅Fully loaded
After you lock the kingpin into the 5th wheel, you should check the
connection by: -
correct answer ✅Pulling the tractor ahead gently with the trailer
brakes locked
Air brake equipped trailers that are manufactured before 1975: -
correct answer ✅Often do not have spring brakes
, CDL Combo Test Exam Questions and
Answers
All trailers and converter dollies built on or after March 1, 1998 are
required to have ABS. -
correct answer ✅True
Before you back under a trailer, make sure that: -
correct answer ✅The trailer brakes are locked
Before you begin coupling: -
correct answer ✅Check your path for hazards
Check for normal air pressure, release the parking & emergency
brakes, move the vehicle forward slowly, and apply trailer brake
with the trailer hand valve, if so equippeD) This best describes: -
correct answer ✅How you can test the trailer service brakes
Check for normal air pressure, release the parking & emergency
brakes, move the vehicle forward at 3-5 mph, then push in the foot
brake and clutch. This best describes: -
correct answer ✅How you can test the service brakes
Check for normal air pressure, release the parking brake but leave
the trailer emergency brake out, pull gently against the brakes in
Answers
A kingpin is: -
correct answer ✅A pin on the trailer that locks it to the tractor 5th
wheel
A tractor with a ____ trailer requires the shortest amount of
stopping distance. -
correct answer ✅Fully loaded
A trailer is most likely to jackknife when it is: -
correct answer ✅Empty
A trailer is most likely to roll over when it is: -
correct answer ✅Fully loaded
After you lock the kingpin into the 5th wheel, you should check the
connection by: -
correct answer ✅Pulling the tractor ahead gently with the trailer
brakes locked
Air brake equipped trailers that are manufactured before 1975: -
correct answer ✅Often do not have spring brakes
, CDL Combo Test Exam Questions and
Answers
All trailers and converter dollies built on or after March 1, 1998 are
required to have ABS. -
correct answer ✅True
Before you back under a trailer, make sure that: -
correct answer ✅The trailer brakes are locked
Before you begin coupling: -
correct answer ✅Check your path for hazards
Check for normal air pressure, release the parking & emergency
brakes, move the vehicle forward slowly, and apply trailer brake
with the trailer hand valve, if so equippeD) This best describes: -
correct answer ✅How you can test the trailer service brakes
Check for normal air pressure, release the parking & emergency
brakes, move the vehicle forward at 3-5 mph, then push in the foot
brake and clutch. This best describes: -
correct answer ✅How you can test the service brakes
Check for normal air pressure, release the parking brake but leave
the trailer emergency brake out, pull gently against the brakes in
