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

Q.1

Trailers with low underneath clearance may be difficult to drive:

On interstate highways.
Over railroad crossings.
On dirt roads.
At the posted speed limit.

Q.2

After connecting the air lines to the trailer while coupling, you should:

Supply air to the trailer.
Chock the wheels.
Inspect the fifth wheel.

Q.3

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.

Q.4

Trailers built before 1975 are:

Required to have spring brakes.
Not required to have spring brakes.
Unsafe to drive.

Q.5

Test the tractor protection valve by:

Removing the air supply knob.
Removing the parking brake control knob.
Releasing air with the brake pedal.
Releasing air with the gas pedal.

Q.6

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.7

Avoid needing to make sudden lane changes by:

Using your horn to encourage other drivers to move out of your lane.
Only driving slower than the posted speed limit.
Watching the road ahead while driving.

Q.8

When backing up while coupling a trailer, the tractor should be positioned:

Directly in front of the trailer.
Directly next to the trailer.
Parallel with the trailer.

Q.9

In a sudden turn, the ____ trailer is the most likely to turn over.

Front
Last
Middle

Q.10

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.11

Look into the back of the fifth wheel:

While testing your air brakes.
If your vehicle begins to skid.
When inspecting a coupling.

Q.12

Before beginning a trip, you should:

Leave the service line valve open.
Remove the relay valves.
Close the emergency line valve.

Q.13

When uncoupling a trailer, landing gear should be:

Raised completely.
Lowered halfway.
Just off the pavement.
Firmly on the ground.

Q.14

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

Bridges.
Railroad tracks.
Overpasses.

Q.15

Pull out the trailer air supply control to test:

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

Q.16

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.
Move the vehicle forward slowly and apply the brakes with the hand control.

Q.17

Rollovers happen when:

You drive too slowly.
You are stopped.
You take a turn too fast.

Q.18

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.19

In a double or triple combination:

Cargo weight must be evenly distributed between all trailers.
The heaviest trailer should be positioned directly behind the cab.
The heaviest trailer should be positioned in the rear.

Q.20

When braking with ABS, you should:

Push the brake pedal harder than usual.
Push the brake pedal as you normally would.
Push the brake pedal more lightly than usual.

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