Coupling & Hitches
12 free questions, part of the Combination Vehicles CDL practice test
Coupling a tractor to a semitrailer means backing squarely under the trailer with the fifth wheel in the right position, locking the jaws around the kingpin, and confirming the connection with a tug test and a flashlight check. These questions also cover pintle hook, drawbar (ball-and-cup), and gooseneck hitch connections, including the safety chains and locking devices each one requires. ELDT.io's free bank has 12 coupling and hitch questions, grounded in 49 CFR 383.111(c)(1) and 393.70.
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When coupling, what is the proper position of the fifth wheel?
It needs to be centered, and if it is a sliding fifth wheel, locked in a position that is not too far forward or too far back for the trailer's kingpin and landing gear height. Check and adjust it before you back under the trailer, not after.
How can I tell a pintle hook latch is properly locked?
You should be able to see the latch fully closed and seated over the hook with no gap, and the locking pin or lever fully engaged. Check it visually every time, do not assume it latched just because it moved into place.
Why do gooseneck hitch connections need safety chains?
Safety chains back up the hitch connection in case the coupler fails or is not fully engaged, so the trailer cannot come loose from the tow vehicle. They are a required part of the coupling procedure, not an extra step.