You should always use turn signals to warn others about your intentions.

It is best to hide your intentions from others.

You should only use turn signals if there are vehicles near you.

You should not use turn signals in construction zones.

A tube used to move air from the compressor to the tanks

A noise made by air brakes when used

A part within the braking unit that allows air to move freely

Illinois CDL Double 1 - DMV Written Test Questions with Answers

Q.1

If an Anti-Lock Braking System (ABS) malfunctions:

The driver will not know.
A yellow lamp will light up on the control panel.
The brakes will lock up.
The brakes will not work.

Q.2

When driving:

It is best to hide your intentions from others.
You should only use turn signals if there are vehicles near you.
You should not use turn signals in construction zones.
You should always use turn signals to warn others about your intentions.

Q.3

Applying the brake pedal causes air pressure to activate an electric switch and:

Turn off the brake lights.
Turn on the low pressure warning light.
Turn on the brake lights.
Turn off the low pressure warning light.

Q.4

A converter dolly that has ABS can be identified:

By a blue sticker.
By an orange sticker.
By a yellow lamp on the left side of the dolly.
By a blue lamp on the left side of the trailer.

Q.5

How could you reduce your stress while driving?

Drink a caffeinated beverage
Talk on your cell phone
Gesture at other drivers
Listen to calming music

Q.6

If your brakes fail on a downgrade, your best hope to stop is:

An escape ramp.
Driving on the shoulder.
Stay on the road.
Hitting a slower vehicle in front of you.

Q.7

In bad weather, many drivers:

Like to drive in front of trucks.
Like to be on the side of trucks.
Like to follow trucks.
Like to drive without using their lights.

Q.8

Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:

An extra set of brakes.
Voice-activated brakes.
Cruise control.
Anti-Lock Braking Systems (ABS).

Q.9

Which of the following is not a possible cause of a fire?

Under-inflated tires
Electrical system failures
Flammable cargo
Rolling down the window

Q.10

How should you test the low pressure warning signal?

Engage and disable the parking brake.
Rapidly press and release the brake pedal.
Open the rear shut-off valves.
Uncouple and recouple all glad hands.

Q.11

After an accident, flares should be used with caution because:

There may be spilled fuel on the ground that could ignite.
Other drivers may not see the flares.
Flares are expensive.
Other drivers may get confused about what is happening.

Q.12

Without oil in its engine:

A vehicle will likely run smoothly.
A vehicle will make quick jerks while driving.
A vehicle's engine may be damaged quickly.
A vehicle's gas mileage will improve.

Q.13

Radial and bias-ply tires:

Should be used together on all axles.
Should be used together, but only on the rear axle.
Should not be used together.

Q.14

During a pre-trip inspection, what is the best method for checking your lights?

Parking near a mirror to look for a reflection
Activating the lights, then exiting the vehicle to check
Looking on the instrument panel to see if any warning lights are illuminated
Driving in traffic and waiting for other drivers to let you know your lights are out

Q.15

What is a wig wag?

A type of warning system
A tube used to move air from the compressor to the tanks
A noise made by air brakes when used
A part within the braking unit that allows air to move freely

Q.16

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.17

Hydroplaning usually occurs:

When tires are properly inflated.
At speeds under 15 mph.
In areas where water collects on the road.
During the evening.

Q.18

When approaching a railroad crossing, you should:

Rely on the posted signals to indicate when a train is approaching.
Rely on the movements of other motorists to indicate when a train is approaching.
Not rely on signals to indicate when a train is approaching.
Look to see if nearby plants are moving from the breeze created by a passing train

Q.19

When driving down a steep grade, your brakes may fade. What happens if brakes fade?

They become quieter.
They become less effective.
They work better than usual.
They work differently from front to back.

Q.20

When parking a double or triple, look for a parking space that is:

Easy to enter and exit.
Close to parked cars.
On the grass, away from other vehicles.
Directly in front of a building.