Combination - North Carolina Cdl

1 . Pushing in the trailer air supply control will:

Supply the trailer with air. Deactivate the air brakes. Prevent the vehicle from skidding. Click Here Full Cheat Sheet

2 . Using the trailer hand valve while driving:

Will help you turn safely. Will stop your trailer safely. Can cause a skid. Is impossible. Take a FREE Practice Test Now

3 . A trolley valve:

Should be used while driving. Should only be used to test trailer brakes. Should be used when parking uphill. Take a FREE Practice Test Now

4 . If the trailer begins to skid, it is best to:

Release the brakes. Accelerate. Quickly turn the steering wheel one way, then the other. Brake. Take a FREE Practice Test Now

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

Turn the top of the steering wheel in the direction you want the trailer to go. Turn the top of the steering wheel in the direction opposite of where you want the trailer to go. It doesn’t matter. It depends on where the trailer is being backed. Click Here Full Cheat Sheet

6 . Compared to other commercial motor vehicles, combination vehicles need more space on the road because they are longer and they:

Need more space to turn and stop. Drive more slowly. Are twice the width. Swerve more often. Take a FREE Practice Test Now

7 . What is a bobtail tractor?

A tractor without a semi-trailer A tractor with two semi-trailers A tractor that travels faster than the speed limit Take a FREE Practice Test Now

8 . Proper coupling technique:

Is the same on all vehicles. Is essential to the safe operation of a vehicle. Includes ensuring that the fifth wheel plate is not greased. Can be learned over time. Take a FREE Practice Test Now

9 . After finishing a pre-trip inspection, you should:

Close the service line valve. Remove the service line valve. Leave the emergency line valve open. Leave the rear shut-off valves open. Click Here Full Cheat Sheet

10 . Watching the road ahead:

Is more dangerous than only watching your mirrors. Does not help you drive more safely. Can help you avoid the need for sudden lane changes. Take a FREE Practice Test Now

11 . When uncoupling a trailer, landing gear should be:

Raised completely. Lowered halfway. Just off the pavement. Firmly on the ground. Take a FREE Practice Test Now

12 . Pull out the trailer air supply control to test:

The parking brake. The trailer emergency brakes. The trailer service brakes. The landing gear. Take a FREE Practice Test Now

13 . To help prevent rollovers, you should:

Accelerate quickly after stopping. Drive slowly around turns. Keep the load near the back of the trailer. Keep the load on one side of the trailer. Click Here Full Cheat Sheet

Study tip: Reduce your study time from hours to minutes with a DMV exam “Cheat Sheet” 99.2% of people who use the cheat sheet pass the FIRST TIME Click Here Full Cheat Sheet

14 . Simply changing lanes can cause:

A “crack-the-whip” effect, resulting in a rollover. A trailer to straighten out. Confusion over which lane the driver is hoping to use. Other drivers to reduce their speed. Take a FREE Practice Test Now

15 . If a trailer's spring brakes do not release when you push the tractor air supply control, you should:

Check the air line connections. Release the pintle hook. Replace the spring brakes. Drive normally without checking anything. Take a FREE Practice Test Now

16 . The service air line is often controlled by the foot brake and is attached to the ____ valves.

Relay Supply Emergency Take a FREE Practice Test Now

17 . If unsure if a trailer is equipped with ABS, you can:

Check under the trailer for wheel speed sensors coming from the back of the brakes. Try driving on a slippery surface and see if ABS kicks in. Assume it does have ABS. Remove a tire and look for the ABS sensor on the axle. Click Here Full Cheat Sheet

18 . An Anti-Lock Braking System (ABS):

Allows wheels to lock up. Prevents wheels from locking up. Makes it easier to turn a large vehicle. Assists with the operation of brake lights. Take a FREE Practice Test Now

19 . The trailer hand valve should be used:

To test the trailer brakes. To check the connection between the trailer and tractor. To accelerate. To test the lights on the trailer. Take a FREE Practice Test Now

20 . To test the trailer service brakes, you should:

Move the vehicle forward slowly and apply the brakes with the brake pedal. Reverse the vehicle slowly and apply the brakes with the hand control. Reverse the vehicle slowly and apply the brakes with the brake pedal. Move the vehicle forward slowly and apply the brakes with the hand control. Take a FREE Practice Test Now

21 . The service air line is attached to the:

Relay valves. Supply line. Emergency air line. Steering wheel. Click Here Full Cheat Sheet

22 . Driving a combination vehicle ____ than driving a single vehicle.

Is easier Requires more driving skill Is better for training Is safer in inclement weather Take a FREE Practice Test Now

23 . If an air supply control is in its "emergency" position:

The vehicle will increase speed. The trailer emergency brakes will be applied. The air supply to the trailer will increase. Take a FREE Practice Test Now

24 . Before a trip, you can make sure air flows to all trailers by:

Checking for moving air inside of each trailer. Listening for air at the rear shut-off valve. Feeling for air at the front shut-off valve. Take a FREE Practice Test Now

25 . When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.

Level with Slightly higher than Slightly lower than Click Here Full Cheat Sheet