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

Q.1

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

The suspension springs to extend.
The tractor protection valve to open.
The rear trailer to detach from the combination.
The emergency brakes to activate.

Q.2

Combination vehicles:

Are usually shorter than single commercial vehicles.
Usually require less skill to drive than single commercial vehicles.
Usually require more skill to drive than single commercial vehicles.

Q.3

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.4

When coupling a trailer:

Make sure to couple matching glad hands.
Any glad hand can be connected to any other glad hand.
It is best to leave one glad hand unattached.
Only one set of glad hands should be connected.

Q.5

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

In the direction you want the trailer to go.
In the direction opposite of where you want the trailer to go.
To the left.

Q.6

Before a drive, ensure that air flows to all trailers by:

Opening the rear shut-off valves and listening for escaping air.
Closing the rear shut-off valves and listening for escaping air.
Disconnecting air supply lines and listening for escaping air.
Rolling each trailer down a hill and testing the brakes.

Q.7

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.8

When coupling a trailer, you should:

Couple together the proper glad hands.
Couple glad hands with any other glad hands.
Leave one pair of glad hand loose.

Q.9

If a trailer is too high:

It will not make a difference when coupling.
It may not couple correctly.
Coupling will be more secure.
Coupling will be easier.

Q.10

If a trailer begins to jackknife, the driver:

Should not apply the trailer hand brake.
Should firmly apply the brakes.
Can straighten the trailer with the parking brake.

Q.11

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.12

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.13

When lightly loaded, combination vehicles:

Should not be driven.
Have reduced braking capabilities.
Will not rollover.
Should be loaded with most of the weight in the rear of the trailer.

Q.14

Which type of vehicle is most prone to the “crack-the-whip” effect?

A five-axle tractor semi-trailer
A three-axle tractor semi-trailer
A bobtail tractor
A triple trailer

Q.15

When coupling, after you've connected the air lines to the trailer, you should:

Supply air to the trailer.
Activate the emergency brake.
Disconnect the glad hands.

Q.16

Trailers with low underneath clearance can present challenges when driving over:

Bridges.
Railroad tracks.
Overpasses.

Q.17

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.

Q.18

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

Disengaged.
Locked.
Deactivated.
Dry.

Q.19

If oil and water build up in your vehicle's air tanks, the brakes:

May not work correctly.
May feel squishy.
Will squeal loudly when used.
Will be extremely sensitive.

Q.20

During a trip, landing gear should be:

Completely raised.
Completely lowered.
Skimming the pavement.

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