CDL Combination Vehicles Q&A Exam Bundle

Glad hands are used to connect the? Service and emergency air lines from the tractor trailer. Why should you be sure the fifth wheel plate is greased as required? To prevent steering problems After connecting the air lines, but before backing under the trailer, you should? Supply air to the tr...

Glad hands are used to connect the? Service and emergency air lines from the tractor trailer. Why should you be sure the fifth wheel plate is greased as required? To prevent steering problems After connecting the air lines, but before backing under the trailer, you should? Supply air to the tr...

You supply air to the trailer tanks by: A. Pushing in the trailer air supply valve B. Pulling out the trailer air supply valve C. Connecting the service air line A. Pushing in the trailer air supply valve Loss of air pressure in the emergency line causes: A. The relay valve to close ...

When you check the lower fifth wheel, you do NOT need to check That the shut-off valves completely closed Which of the following is most likely to roll over? a) The rear trailer of a triple b) The middle trailer of a triple c) The rear trailer of a double d) The front trailer of a double a...

You supply air to the trailer tanks bypushing in the trailer supply valve Loss of air pressure in the emergency line causesthe trailer's emergency brakes to come on A tractor with a ___ trailer requires the shortest amount of stopping distance.fully loaded Which of these statements is true...

When should you use the hand valve to park a combination vehicle A. Never B. To park at loading docks C. To park on a grade A. Never Semitrailers made before 1975 that are equipped with air brakes A. Often they don't have spring brakes B. Usually need glad hand converter C. The...

You are coupling tractor to semi-trailer. You have backed up but are not yet under it Before backing under the semi-trailer, you should hook up the emergency and service air lines. An antilock braking system (ABS) is useful whether it is on the tractor or the trailers. When you drive a set of ...

You should not back a tractor under a trailer until the whole air system is: At normal pressure You are coupling a semi trailer to your tractor but have not yet backed under. The trailer is at the right height when: It will be raised slightly when the tractor is backed under it. Which part of ...

What two things are important to prevent rollover? (6.1.1) 1. Keep cargo as close to the ground as possible 2. Drive slowly around turns When you turn suddenly while pulling doubles, which trailer is most likely to turn over? (6.1.2) The rear most trailer What is the "crack-the-whip" effe...

Why should you make sure that the fifth wheel plate is greased as required? To prevent steering problems Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every ___ feet of your vehicle's length. 10 Compared with a stra...

You are coupling a semi-trailer to your tractor but have not yet backed under, the trailer is at the right height when: It will be raised slightly when the tractor is backed under it. You should not back a tractor under a trailer until the whole air system is: At normal pressure. Which part of...

HOW CAN YOU TEST THE TRAILER EMERGENCY BRAKES? Place the tractor emergency valve in the emergency position, try to nudge the vehicle forward. COMBINATION VEHICLES ARE USUALLY HEAVIER, LONGER, AND REQUIRE MORE DRIVING SKILL THAN SINGLE COMMERCIAL VEHICLES. True WHAT TYPE OF TRAILERS CAN GET STU...