CDL doubles and triples practice test 2

A: Open the air tank petcock. A dolly without spring brakes releases its brakes when you open the air tank petcock. Dollies with spring brakes use their parking brake control instead. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.1 Coupling Twin Trailers, page 7-2.

B: Lock it. Hook the dolly to the front trailer, lock the pintle hook, and secure the converter gear support in the raised position. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.1 Coupling Twin Trailers, page 7-2.

C: Slightly lower than the center of the fifth wheel, so it is raised slightly when the dolly is pushed under. Set the trailer a bit below the center of the dolly's fifth wheel, so the trailer gets lifted slightly as the dolly goes under it. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.1 Coupling Twin Trailers, page 7-2.

D: Pull against the pin of the second semitrailer. Raise the landing gear slightly off the ground, then test the coupling by pulling against the pin of the second semitrailer. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.1 Coupling Twin Trailers, page 7-2.

A: No space between the upper and lower fifth wheel, and locking jaws closed on the kingpin. A visual check should show no space between the upper and lower fifth wheel and the locking jaws closed on the kingpin. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.1 Coupling Twin Trailers, page 7-2.

B: The shut-off valves at the rear of the second (last) trailer, along with the dolly air tank petcock. Close the converter dolly air tank petcock and the service and emergency shut-offs at the rear of the second trailer; open the shut-offs at the rear of the first trailer. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.1 Coupling Twin Trailers, page 7-2.

D: After the dolly is coupled, lines are connected and valves are set. Raise the landing gear slightly off the ground once the dolly is backed under the rear trailer, then raise it completely only after the coupling is checked, the safety chains, air hoses and light cords are connected, and the shut-off valves are set. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.1 Coupling Twin Trailers, page 7-2.

A: Park the rig in a straight line on firm, level ground. To uncouple the rear trailer, park the rig in a straight line on firm level ground and apply the parking brakes so the rig won't move. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.2 Uncoupling Twin Trailers, page 7-2.

B: To remove some weight from the dolly. Lower the landing gear of the second semitrailer enough to remove some weight from the dolly. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.2 Uncoupling Twin Trailers, page 7-2.

C: Chock its wheels. Chock the wheels of the second trailer if it doesn't have spring brakes. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.2 Uncoupling Twin Trailers, page 7-2.

D: Close air shut-offs at the rear of the first semitrailer and disconnect and secure the dolly air and electric lines. Close the air shut-offs at the rear of the first semitrailer, disconnect and secure all dolly air and electric lines, release the dolly brakes, then release the dolly fifth wheel latch. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.2 Uncoupling Twin Trailers, page 7-2.

A: The dolly tow bar may fly up, possibly causing injury and making re-coupling very difficult. Releasing the pintle hook while the dolly is still under the rear trailer can make the tow bar spring up. It could injure you and make re-coupling very hard. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.2 Uncoupling Twin Trailers, page 7-3.

B: Lower the dolly landing gear, disconnect the safety chains, and apply the dolly spring brakes or chock its wheels. To uncouple the dolly, lower its landing gear, disconnect the safety chains, apply the converter gear spring brakes or chock the wheels, then release the pintle hook and slowly pull clear. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.2 Uncoupling Twin Trailers, page 7-3.

C: Move a converter dolly into position and couple the first trailer to the second trailer, using the method for coupling doubles. After coupling the tractor to the first trailer the usual way, position a converter dolly and couple the first trailer to the second (already joined to the third) using the doubles method; the triples rig is then complete. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.3 Coupling and Uncoupling Triple Trailers, page 7-3.

D: Uncouple the third trailer by pulling the dolly out and unhitching it, then uncouple the rest as a double. Uncouple the third trailer by pulling the dolly out, then unhitching the dolly, then uncouple the rest as you would any double-bottom rig. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.3 Coupling and Uncoupling Triple Trailers, page 7-3.

A: Follow the manufacturer and/or owner specifications for the vehicle you will drive. There are too many combinations to cover, so learn the correct way for your vehicle according to the manufacturer and/or owner specifications. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.2.4 Coupling and Uncoupling Other Combinations, page 7-3.

B: The seven-step inspection procedure in Section 2, plus the additional coupling checks. Use the seven-step inspection procedure from Section 2, plus the additional checks for combinations. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.3 Inspecting Doubles and Triples, page 7-3.

C: Around the shank of the kingpin, not the head. Locking jaws must be around the shank, not the head, of the kingpin, with no visible space between the upper and lower fifth wheel. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.3.1 Additional Checks, page 7-3.

D: Glide plate securely mounted to the trailer frame and kingpin not damaged. Check that the glide plate is securely mounted to the trailer frame and that the kingpin is not damaged. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.3.1 Additional Checks, page 7-3.

A: Properly connected to the glad hands, no leaks, secured with enough slack for turns. Air lines should be properly connected to the glad hands with no air leaks and properly secured with enough slack for turns. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.3.1 Additional Checks, page 7-3.

B: All locking pins present and locked in place. On a sliding fifth wheel, check that the slide isn't damaged, it is greased, all locking pins are present and locked, and there are no air leaks if it is air powered. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.3.1 Additional Checks, page 7-3.

C: So the tractor frame won't hit the landing gear, or the cab won't hit the trailer, during turns. If the fifth wheel sits too far forward, the tractor frame can strike the landing gear, or the cab can strike the trailer, in a turn. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.3.1 Additional Checks, page 7-3.

D: Fully raised, with no missing parts and the crank handle secured. Landing gear should be fully raised, with no missing, bent or damaged parts, the crank handle in place and secured, and no leaks if power operated. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.3.1 Additional Checks, page 7-3.

A: Open. Shut-off valves at the rear of the front trailers must be OPEN so air reaches the trailers behind. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.3.1 Additional Checks, page 7-3.

B: Closed. The shut-off valves at the rear of the last trailer must be CLOSED. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 7.3.1 Additional Checks, page 7-3.