20 Tests

CDL Combination Vehicles Practice Test Online | Pennsylvania 2021

Train for FREE online with our Pennsylvania CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a PA combination license in 2021, practice as much as.. Read More

Train for FREE online with our Pennsylvania CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a PA combination license in 2021, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.

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1 . When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle.

Four seconds At speeds below 40 mph, you should allow at least one second of following distance for every 10 feet of your vehicle. Follow the same formula when traveling at faster speeds, then add one additional second to your following distance. Remember that larger vehicles require more space to stop than smaller vehicles.

2 . A loss of air pressure in the emergency line will cause:

The emergency brakes to activate. The emergency air line controls the emergency brakes on a combination vehicle. A loss of air pressure in the emergency line will cause the emergency trailer brakes to activate.

3 . When backing a trailer, how should you turn the steering wheel?

It depends on where the trailer is being backed. When backing with a trailer, turn the top of the steering wheel in the direction opposite of where you want to go. Once the trailer begins turning, you should then switch the direction of the steering wheel to follow the trailer.

4 . After coupling, there should be ____ between the upper and lower fifth wheel.

Three inches of space Before a trip, be sure to inspect all couplings. There should be no space between the upper and lower fifth wheel.

5 . While inspecting a coupling, you should go under the trailer and:

Look into the back of the fifth wheel. While inspecting a coupling, you should go under the trailer and look into the back of the fifth wheel. Ensure that the fifth wheel jaws are secured around the shank of the kingpin.

6 . What does the trailer air supply control look like?

It is a circular orange knob. On newer vehicles, the trailer air supply control is an eight-sided red knob. It's used to control the tractor protection valve.

7 . If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can:

Assume the vehicle has ABS. If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can check under the trailer for wheel speed sensors coming from the back of the brakes.

Wait, before you go

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