Oregon CDL Combination 1 - DMV Written Test Questions with Answers - MCQGeeks.com

Q.1

When backing a trailer, you must turn the steering wheel:

In the direction you want the trailer to move.
In the direction opposite of where you want the trailer to move.
To the left until backing is complete.

Q.2

In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:

20 and 45 psi.
75 and 105 psi.
50 and 65 psi.

Q.3

An air supply control in its "emergency" position will:

Turn on the air supply.
Apply the trailer emergency brakes.
Prevent a skid.
Accelerate the vehicle.

Q.4

Fully-loaded rigs:

Are less likely to roll over than empty rigs.
Are more likely to roll over than empty rigs.
Are just as likely to roll over as empty rigs.
Should not be driven.

Q.5

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.

Q.6

More than half of all accident-related truck driver deaths are caused by:

Rollovers.
Slippery roads.
Other drivers.

Q.7

When driving a vehicle equipped with an Anti-Lock Braking System (ABS), brakes should be applied:

In the same way as they would be in a vehicle without ABS.
As the vehicle is placed in neutral.
With the hand brake.

Q.8

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.

Q.9

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.10

What can the “crack-the-whip” effect do?

Turn over trailers.
Make loud noises.
Make trucks accelerate.
Make trucks decelerate.

Q.11

To help prevent a rollover, cargo should be:

Placed as high as possible inside the trailer.
Placed as low as possible inside the trailer.
Placed on the passenger side of the trailer.
Placed on the driver’s side of the trailer.

Q.12

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.13

To prevent a rollover, a driver should:

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

Q.14

What is another name for the service line?

Control line
Exchange line
Surplus line
Parallel line

Q.15

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.16

The trailer hand valve:

Should always be used for parking.
Should only be used for parking on a downhill.
Should never be used for parking.
Should only be used when transporting cargo.

Q.17

If the emergency air line loses pressure:

The Anti-Lock Braking System will activate.
The service air line will activate.
The emergency brakes will activate.

Q.18

The emergency air line:

Is controlled by the foot brake.
Is connected to the relay valves.
Supplies air to the trailer air tanks.
Prevents skids.

Q.19

During a trip, which shut-off valves should be open?

All shut-off valves should be open.
The rear shut-off valves should be open.
All shut-off valves should be in the open position, except the rear shut-off valves.
No shut-off valves should be open.

Q.20

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.

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