Prevents air from escaping an air brake system.

Is located on the front of a trailer.

Is located on the instrument panel.

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.

Connecticut CDL Combination 1 - DMV Written Test Questions with Answers

Q.1

When you are pulling a trailer, the air supply control lever should be in its ____ position.

Emergency
Supply
Normal

Q.2

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.

Q.3

What is a bobtail tractor?

A tractor without a trailer
A tractor attached to two trailers
A tractor with a tank

Q.4

When glad hands are coupled, the seals should be pressed together at an angle of:

30 degrees.
45 degrees.
60 degrees.
90 degrees.

Q.5

A tractor protection valve is:

A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.
A device that prevents theft.
A device that controls fuel levels.
A device that allows the battery to recharge efficiently.

Q.6

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

Ask another driver.
Use your mirrors to determine if the trailer has left the lane.
Release the brake pedal and then push it down again.
Watch the jackknife warning light on the control panel.

Q.7

What happens when the wheels of a trailer lock up?

The trailer will often continue to move in a straight line.
The trailer may disengage.
The trailer may swing around.
Steering will become easier.

Q.8

If a trailer begins to skid, the driver should:

Lock the brakes.
Release the brakes.
Steer in the opposite direction.
Accelerate.

Q.9

When braking while pulling a trailer equipped with anti-lock brakes, you should:

Pump the brakes.
Use extra braking force to ensure the brakes kick in.
Brake as you would without anti-lock brakes.

Q.10

What does an Anti-Lock Braking System (ABS) do?

It allows a vehicle's wheels to lock up.
It prevents a vehicle's wheels from locking up.
It makes turning a vehicle easier.

Q.11

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.12

Before a trip, you can make sure air flows to all trailers by:

Checking for moving air inside of each trailer.
Listening for air at the rear shut-off valve.
Feeling for air at the front shut-off valve.

Q.13

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.14

A combination vehicle has:

One air line.
Two air lines.
Three air lines.
Four air lines.

Q.15

If colors are being used to distinguish glad hands, which color is used for service lines?

Orange
Yellow
Green
Blue

Q.16

When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle.

One second
Two seconds
Three seconds
Four seconds

Q.17

The "crack-the-whip" effect can:

Turn over a trailer.
Be more effective than braking.
Make a truck move faster.

Q.18

Having ABS on only one axle:

Does not change braking in any way.
Is not possible.
Will allow the driver additional control over their vehicle when braking.
Will cause extra strain on the other axles.

Q.19

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.20

When driving a bobtail tractor, you should be aware that:

Bobtails stop very easily.
Bobtails cannot drive as fast as tractors with semitrailers.
Bobtails are more difficult to stop than tractors with semitrailers.
Bobtails are illegal in most states.