Prevent air from escaping air brake systems.

Prevent air from entering air brake systems.

Override vehicles that are out of control.

Be sure that you are coupling correctly.

You can assume all vehicles are the same.

Cracks in the mounting are acceptable.

South Carolina CDL Combination 2 - DMV Written Test Questions with Answers

Q.1

Combination vehicles:

Often have taller trailers than single commercial vehicles.
Are usually lighter than single commercial vehicles.
Require more skill to drive than single commercial vehicles.

Q.2

The emergency air line supplies air to the:

Relay valves.
Trailer air tanks.
Signal line.

Q.3

What is the tractor protection valve?

A valve that keeps air in the brake system should a bad leak occur
A valve that prevents the trailer from being accidentally released
A valve that prevents the vehicle from going too fast

Q.4

Combination vehicles are usually:

Easier to drive than single commercial vehicles.
Lighter than single commercial vehicles.
More difficult to drive than single commercial vehicles.

Q.5

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

Seeing other drivers' faces.
Seeing it in your mirrors.
Feeling it.
Listening to the radio.

Q.6

To prevent a trailer from rolling over, you should:

Speed up when nearing a corner.
Make sudden steering moves.
Take on-ramps faster than the posted speed limit.
Drive slowly around corners.

Q.7

When driving a trailer with ABS, you should:

Not depress the brakes as much as you would when driving a vehicle without ABS.
Use extra braking force to ensure the ABS kicks in.
Brake as you would when driving a vehicle without ABS.
Try to not brakes as often as you would when driving a vehicle without ABS.

Q.8

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

No space
Very little space
A lot of space
Three inches of space

Q.9

During a trip, landing gear should be:

Completely raised.
Completely lowered.
Skimming the pavement.

Q.10

The trailer hand valve should be used:

To test the trailer brakes.
To check the connection between the trailer and tractor.
To accelerate.

Q.11

Shut-off valves:

Prevent air from escaping air brake systems.
Prevent air from entering air brake systems.
Override vehicles that are out of control.

Q.12

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.

Q.13

When entering or crossing traffic while driving a combination vehicle, it is especially important that you:

Sound your horn.
Make sure there is a large enough gap for your vehicle.
Expect other drivers to make room for your vehicle.
Let other drivers wave you into their lane.

Q.14

Operating combination vehicles usually requires ____ operating single vehicles.

Less skill than
About the same level of skill as
More skill than

Q.15

Combination vehicles:

Are usually shorter than single commercial vehicles.
Are usually lighter than single commercial vehicles.
Require more skill to drive than single commercial vehicles.
Are easier to drive than single commercial vehicles.

Q.16

The trailer hand valve should be used:

To accelerate in rural areas.
Only to test the trailer brakes.
Together with the brake pedal.
On slippery surfaces.

Q.17

The trailer hand valve should:

Be used for parking.
Be used only to test the trailer brakes.
Be used together with the brake pedal.
Be used on slippery surfaces.

Q.18

Rollovers happen when drivers:

Turn too quickly.
Do not driving fast enough.
Pay attention to the road.
Drive illegally.

Q.19

If your trailer begins to drift off course while you are backing, you should:

Continue trying to back up without stopping.
Turn the top of your steering wheel in the direction of the drift.
Turn the top of the steering wheel in the direction opposite of the drift.
Return the steering wheel to the 12 o’clock position.

Q.20

When coupling:

You can assume all vehicles are the same.
Be sure that you are coupling correctly.
Cracks in the mounting are acceptable.

Combination vehicles:

The emergency air line supplies air to the:

What is the tractor protection valve?

Combination vehicles are usually:

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

To prevent a trailer from rolling over, you should:

When driving a trailer with ABS, you should:

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

During a trip, landing gear should be:

The trailer hand valve should be used:

Shut-off valves:

To help prevent rollovers, you should:

When entering or crossing traffic while driving a combination vehicle, it is especially important that you:

Operating combination vehicles usually requires ­­­­­____ operating single vehicles.

Combination vehicles:

The trailer hand valve should be used:

The trailer hand valve should:

Rollovers happen when drivers:

If your trailer begins to drift off course while you are backing, you should:

When coupling:

0 h : 0 m : 1 s

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Operating combination vehicles usually requires ____ operating single vehicles.