CDL Combination Vehicles Practice Test 1

A fully loaded rig is __ times more likely to roll over in a crash than an empty rig.

When following behind other vehicles, you should follow

A trailer jackknife is likely to happen when

What is the fastest and best way to recognize that your trailer has started to skid?

If your trailer begins to skid, you should

Which of the following will help prevent a rollover:

On the trailer air lines of a combination vehicle, the service line connects to the _________ on the trailer to control the pressure to the trailer brakes.

On older trailers, what will happen if the emergency and service air lines are crossed?

When hoses are not in use, why should the trailer gland hands be locked together or attached to dead end or dummy couplers?

If the trailer protection valve malfunctions, which of the following may occur?