CDL COMBINATION VEHICLE PRACTICE TEST
SKILLS EVALUATION 2026 QUESTION BANK
FULL SOLUTION SET
◉ What happens when there is a loss of air pressure in the
emergency line?
Answer: Brakes apply
◉ Which type of trailer requires the shortest stopping distance?
Answer: Full
◉ Which statement about combination vehicles is true?
Answer: Loaded stops shortest
◉ What should you do if you cannot make a right turn without
swinging wide?
Answer: Avoid turn
◉ What causes emergency brakes to activate?
Answer: Major leak in emergency line
◉ Which vehicle follows the widest path due to off tracking?
, Answer: Doubles
◉ What should you do if stuck on railroad tracks?
Answer: Exit vehicle
◉ Where are shut-off valves located on doubles?
Answer: Rear
◉ What should you ensure before backing under a trailer?
Answer: Wheels straight
◉ How do you unlock the fifth wheel?
Answer: Pull handle to open
◉ What should you do before backing under a trailer after
connecting lines?
Answer: Supply air
◉ What is the proper trailer height?
Answer: Level
◉ Why do you connect air lines to dummy couplers?
SKILLS EVALUATION 2026 QUESTION BANK
FULL SOLUTION SET
◉ What happens when there is a loss of air pressure in the
emergency line?
Answer: Brakes apply
◉ Which type of trailer requires the shortest stopping distance?
Answer: Full
◉ Which statement about combination vehicles is true?
Answer: Loaded stops shortest
◉ What should you do if you cannot make a right turn without
swinging wide?
Answer: Avoid turn
◉ What causes emergency brakes to activate?
Answer: Major leak in emergency line
◉ Which vehicle follows the widest path due to off tracking?
, Answer: Doubles
◉ What should you do if stuck on railroad tracks?
Answer: Exit vehicle
◉ Where are shut-off valves located on doubles?
Answer: Rear
◉ What should you ensure before backing under a trailer?
Answer: Wheels straight
◉ How do you unlock the fifth wheel?
Answer: Pull handle to open
◉ What should you do before backing under a trailer after
connecting lines?
Answer: Supply air
◉ What is the proper trailer height?
Answer: Level
◉ Why do you connect air lines to dummy couplers?
