South Dakota CDL Combination 2 - DMV Written Test Questions with Answers - MCQGeeks.com

Q.1

Rollovers are most likely to happen when:

Drivers turn too fast.
Driver turn too slowly.
It is windy.
It is raining.

Q.2

All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).

1943
1998
2009

Q.3

Push in the trailer air supply control to:

Activate the emergency brakes.
Deactivate the air brakes.
Sound the horn.
Supply the trailer with air.

Q.4

Pull out the trailer air supply control to test:

The parking brake.
The trailer emergency brakes.
The trailer service brakes.
The landing gear.

Q.5

What is another name for the service line?

The control line
The utility line
The open line
The parallel line

Q.6

Which of the following types of vehicles is most prone to the “crack-the-whip" effect?

An automobile
A three-axle tractor
A bobtail tractor
A triple combination

Q.7

A trailer that is too high:

May not couple correctly.
Will couple securely.
Is not an issue.

Q.8

If a trailer begins to jackknife, you should not:

Release the brakes.
Apply the trailer hand brake.
Allow the wheels to grip the road.
Allow the trailer to straighten out.

Q.9

A tractor protection valve is:

A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.
A device that prevents theft.
A device that controls fuel levels.
A device that allows the battery to recharge efficiently.

Q.10

A driver should test the tractor protection valve by:

Pulling the yellow, diamond-shaped knob.
Releasing air with the brake pedal.
Unlocking the trailer doors.

Q.11

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.

Q.12

When should the trailer hand valve be used?

Only when the trailer is carrying a load
Only to test the trailer’s brakes
Only in inclement weather when the trailer may skid

Q.13

Using the trailer hand brake while experiencing a trailer jackknife will:

Stop the skid.
Straighten the trailer.
Increase traction.
Continue the skid.

Q.14

Before backing your tractor under the trailer, make sure your trailer brakes are:

Disengaged.
Locked.
Deactivated.
Dry.

Q.15

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 for wheel speed sensors coming from the back of the brakes.
Look for a red light on the front right corner of the converter dolly.
Pump the air brakes to activate the ABS.
Assume the vehicle has ABS.

Q.16

To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:

Pump the air brakes to activate the ABS.
Look into the back of the fifth wheel.
Check for wheel speed sensors coming from the back of the brakes.

Q.17

The best way to recognize that your trailer has started to skid is by:

Seeing other drivers' faces.
Checking the trailer in your mirrors.
Feeling the trailer move.

Q.18

Rollovers happen when:

A truck driver is driving too fast.
The driver of a vehicle in front of a truck is moving to slowly.
A truck driver is driving too slowly.
ABS is working effectively.

Q.19

To prevent a rollover, a driver should:

Keep cargo low.
Place cargo high.
Keep cargo loose.
Turn quickly.

Q.20

If you are backing and the trailer begins to drift off-course, the driver should:

Return the steering wheel to the 12 o’clock position.
Turn the top of the steering wheel in the direction of the drift.
Turn the top of the steering wheel in the direction opposite of the drift.

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