CDL · Combination vehicles
What kind of equipment are glad hands?
Correct answer: Coupling devices that join air lines.
Answer options
- AWarning devices that alert other drivers
- BSecurement devices that hold cargo in place
- CCoupling devices that join air lines Correct
Why
Glad hands are the couplers that connect the service and emergency air lines between the tractor or truck and the trailer. A rubber seal in each one keeps air from leaking at the connection.
About this question
Topic: Combination vehicles License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
Practice the whole set
This question is part of Trailer Air Lines and Coupling (28 questions). Take the full set and check your score.
Practice Trailer Air Lines and CouplingMore questions from Trailer Air Lines and Coupling
- A fifth wheel plate that is not kept properly greased can lead to which problem?
- How do you get air flowing into the trailer's air tanks?
- Many combination vehicles use color-coded air lines so the two are not confused. Which colors are typically used?
- Before your tractor goes under the trailer, what condition must the entire air system be in?
- After coupling to a semitrailer, how should you leave the landing gear (front trailer supports) before pulling away?
- In which situation may a parked combination vehicle be held by the trailer hand valve alone?
- As air pressure drops, a tractor protection valve shuts by itself at a level set by its manufacturer. That level usually falls within which range?
- Which sequence is correct for testing the trailer service brakes?
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