NC CDL COMBINATION VEHICLES
EXAMINATION TEST 2026 QUESTIONS WITH
CORRECT ANSWERS GRADED A+
◉ When coupling to the trailer, how far do you back up before
stopping the first time? Answer: Until the fifth wheel plate just
touches the trailer.
◉ What do you check before backing under the trailer? Answer:
Make sure the trailer brakes are set.
◉ Air lines on a combination vehicle are often colored to keep them
from getting mixed up. What color is the emergency line and what
color is the service line? Answer: Red and blue.
◉ After you back up to the trailer and the fifth wheel plate touches
the trailer, you set the tractor park brake, get out and hook up the
emergency and service air lines. Then what do you do before
backing under the trailer? Answer: Supply air to the trailer system,
then pull out the trailer air supply knob to fully set the trailer brakes.
◉ What three things can you do to prevent rollovers? Answer: Keep
your load centered, keep the load as low in the trailer as possible,
and go slow around turns.
, ◉ How far do you raise the landing gear on your trailer? Answer:
Crank it up as far as it will go.
◉ You have coupled with a semi trailer. In what position should you
put the landing gear before driving away? Answer: Fully raised with
the crank handle secured in its bracket.
◉ When uncoupling, what could happen if you park the trailer at an
angle? Answer: You could do damage to the landing gear and dolly
legs.
◉ Why should you lock the tractor glad hands together or couple
them to the dummy glad hands when bobtailing? Answer: It will
keep dirt and water out of the lines.
◉ When backing under a trailer, you should expect the trailer to be
lifted slightly by the fifth wheel plate. Answer: True.
◉ Before you begin coupling, you should check your travel path for
obstacles and hazards. Answer: True.
◉ What should your air supply pressure gauge read before backing
under a trailer? Answer: 100 - 125 psi.
EXAMINATION TEST 2026 QUESTIONS WITH
CORRECT ANSWERS GRADED A+
◉ When coupling to the trailer, how far do you back up before
stopping the first time? Answer: Until the fifth wheel plate just
touches the trailer.
◉ What do you check before backing under the trailer? Answer:
Make sure the trailer brakes are set.
◉ Air lines on a combination vehicle are often colored to keep them
from getting mixed up. What color is the emergency line and what
color is the service line? Answer: Red and blue.
◉ After you back up to the trailer and the fifth wheel plate touches
the trailer, you set the tractor park brake, get out and hook up the
emergency and service air lines. Then what do you do before
backing under the trailer? Answer: Supply air to the trailer system,
then pull out the trailer air supply knob to fully set the trailer brakes.
◉ What three things can you do to prevent rollovers? Answer: Keep
your load centered, keep the load as low in the trailer as possible,
and go slow around turns.
, ◉ How far do you raise the landing gear on your trailer? Answer:
Crank it up as far as it will go.
◉ You have coupled with a semi trailer. In what position should you
put the landing gear before driving away? Answer: Fully raised with
the crank handle secured in its bracket.
◉ When uncoupling, what could happen if you park the trailer at an
angle? Answer: You could do damage to the landing gear and dolly
legs.
◉ Why should you lock the tractor glad hands together or couple
them to the dummy glad hands when bobtailing? Answer: It will
keep dirt and water out of the lines.
◉ When backing under a trailer, you should expect the trailer to be
lifted slightly by the fifth wheel plate. Answer: True.
◉ Before you begin coupling, you should check your travel path for
obstacles and hazards. Answer: True.
◉ What should your air supply pressure gauge read before backing
under a trailer? Answer: 100 - 125 psi.
