Are more likely to roll over than empty rigs.

Are less likely to roll over than empty rigs.

Are just as likely to roll over as empty rigs.

Prevents air from escaping an air brake system.

Is located on the front of a trailer.

Is located on the instrument panel.

Pennsylvania CDL Combination 2 - DMV Written Test Questions with Answers

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

An Anti-Lock Braking System (ABS):

Allows wheels to lock up.
Prevents wheels from locking up.
Makes it easier to turn a large vehicle.
Assists with the operation of brake lights.

Q.3

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.4

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.
You are experiencing a trailer jackknife.
Wheels have regained traction after a skid.
Air pressure is above 45 psi.

Q.5

Failure to keep the fifth wheel plate properly greased could:

Cause the trailer to disconnect.
Cause steering problems.
Cause braking problems.
Affect the lights.

Q.6

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.7

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.8

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

Q.9

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.10

Compared to other commercial motor vehicles, combination vehicles need more space on the road because they are longer and they:

Need more space to turn and stop.
Drive more slowly.
Are twice the width.
Swerve more often.

Q.11

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.12

One function of the emergency air line is to:

Control the emergency brakes.
Flash when air pressure is below a certain psi.
Allow for quick turning.
Control the ability to maneuver during bad weather conditions.

Q.13

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.14

Trailers manufactured after ____ must be equipped with Anti-Lock Braking Systems (ABS).

1943
1998
2009
2015

Q.15

When a combination vehicle goes around a corner:

The turn should be made as tightly as possible.
The front and rear wheels move in different paths.
The rear wheels should run over the curb.
It is acceptable for street signs to be knocked over if they are too close to the road.

Q.16

When backing a trailer, how should you turn the steering wheel?

Turn the top of the steering wheel in the direction you want the trailer to go.
Turn the top of the steering wheel in the direction opposite of where you want the trailer to go.
It doesn’t matter.
It depends on where the trailer is being backed.

Q.17

When connecting a converter dolly to a second or third trailer, the trailer height should be:

Slightly higher than the center of the fifth wheel.
Level with the center of the fifth wheel.
Slightly lower than the center of the fifth wheel.
Next to the center of the fifth wheel.

Q.18

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

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

Q.19

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.20

A shut-off valve:

Is located on the front of a trailer.
Is located on the instrument panel.
Prevents air from escaping an air brake system.
Should always be open.

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

An Anti-Lock Braking System (ABS):

When coupling a trailer:

In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:

Failure to keep the fifth wheel plate properly greased could:

Fully-loaded rigs:

Trailers with low underneath clearance may be difficult to drive:

To test the trailer service brakes, you should:

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

Compared to other commercial motor vehicles, combination vehicles need more space on the road because they are longer and they:

Rollovers happen when:

One function of the emergency air line is to:

The trailer hand valve:

Trailers manufactured after ____ must be equipped with Anti-Lock Braking Systems (ABS).

When a combination vehicle goes around a corner:

When backing a trailer, how should you turn the steering wheel?

When connecting a converter dolly to a second or third trailer, the trailer height should be:

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

Simply changing lanes can cause:

A shut-off valve:

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