CDL Knowledge - ONLINE CDL SCHOOL

CDL Knowledge

This test evaluates your understanding of key concepts and regulations related to obtaining and maintaining a Commercial Driver’s License (CDL). Mastering CDL knowledge is essential for safe, legal, and professional trucking operations.

Topics Covered:

CDL classifications and endorsement requirements
Air brake systems and vehicle control fundamentals
Pre-trip inspections and road test procedures
Hours of Service (HOS) compliance and logbook regulations
Traffic laws, safety procedures, and hazardous material endorsements

Passing this test demonstrates your readiness to meet CDL standards and operate as a professional truck driver.

1 / 30

When are you required to wear a seatbelt in a commercial vehicle?

Only on highways

At all times when the vehicle is in motion

Only in states that require it

Only when transporting hazardous materials

2 / 30

What is 'jackknifing'?

When the trailer swings out and forms an acute angle with the tractor

When the jack used to lift the vehicle fails

A maneuver used to align the vehicle with a loading dock

When a jackrabbit crosses the road in front of the vehicle

3 / 30

What must you obtain to drive a commercial vehicle with air brakes?

Air Brake Endorsement

Special Air Brake Certificate

Commercial Vehicle Inspection Certificate

Air Brake Adjustment Permit

4 / 30

What is a 'rollover'?

When the vehicle tips over onto its side or roof

When a tire rolls off the rim

When cargo rolls off the trailer

When you renew your CDL

5 / 30

What is the function of an 'air dryer' in a commercial vehicle?

To reduce humidity in the cabin

To remove moisture from the air brake system

To cool the engine air intake

To dry the load

6 / 30

What is the primary purpose of the Hazardous Materials Endorsement?

Allows driving in hazardous road conditions

Permits the transport of materials classified as hazardous

Allows for the transport of oversized loads

Permits driving in restricted areas

7 / 30

Why is it important to use chocks when parking a trailer without a tractor?

To prevent the trailer from rolling

To level the trailer on uneven ground

To support the trailer's landing gear

To mark the trailer's position for return

8 / 30

What does 'GVWR' stand for?

Gross Vehicle Weight Rating

General Vehicle Width Requirement

Gradual Vehicle Width Reduction

Gross Vehicle Weight Reduction

9 / 30

Why is it important to distribute cargo evenly?

To prevent damage to the cargo

To make unloading easier

To ensure the vehicle handles correctly

All of the above

10 / 30

What action should you take if you experience a tire blowout while driving?

Brake immediately to stop

Maintain speed and steer straight until slowing

Accelerate to compensate for the lost tire

Pull the emergency brake

11 / 30

What is 'coupling' in the context of commercial driving?

Connecting two containers

Linking the tractor to the trailer

Securing cargo on the trailer

Tightening wheel nuts

12 / 30

How do you test the service brakes on a commercial vehicle?

Push the pedal to the floor

Pull forward at 5 mph and apply the brakes

Apply the brakes while parked

All of the above

13 / 30

Which document must always be in possession of the CDL driver while operating a commercial vehicle?

Vehicle registration

Medical examiner's certificate

Bill of lading

All of the above

14 / 30

What is the minimum tread depth for front tires on a commercial vehicle?

4/32 inch

2/32 inch

3/32 inch

1/32 inch

15 / 30

When should you use your mirrors while driving a commercial vehicle?

Only when changing lanes

When making turns and changing lanes

Regularly, to monitor traffic and check for cargo shifting

Only when backing up

16 / 30

What is the purpose of a 'fifth wheel' in a truck?

To provide extra support for heavy loads

To connect the tractor to the trailer

To enhance steering capabilities

To improve fuel efficiency

17 / 30

Which of the following is not a part of the air brake system?

Compressor

Drum brake

Air dryer

Radiator

18 / 30

What should you do if your commercial vehicle starts to hydroplane?

Accelerate quickly

Brake hard

Release the accelerator and steer straight

Turn the wheel back and forth

19 / 30

What is the 'No-Zone' in commercial driving?

Areas where parking is not allowed

Blind spots around a truck or bus

Zones with maximum speed limits

Areas designated for passenger loading only

20 / 30

If you are convicted of a DUI while operating a commercial vehicle, what is the minimum suspension period for the first offense?

30 days

One year

Six months

Three months

21 / 30

When loading a trailer, where should the heaviest items be placed?

To the rear

To the front

In the middle

Spread evenly throughout

22 / 30

What does 'HOS' stand for in the context of commercial driving?

Hours Of Service

Heavy Overload Scale

Highway Operation Safety

Hours Of Sleeping

23 / 30

What is the most common cause of commercial vehicle crashes?

Equipment failure

Road conditions

Driver error

Weather

24 / 30

When driving a truck with a manual transmission, what is 'double clutching'?

Using the clutch twice before shifting

Pressing the clutch once and pumping it second time

Shifting without the clutch

None of the above

25 / 30

What is a 'Jake Brake'?

A special parking brake

An engine braking system

A hydraulic brake booster

A type of brake pad

26 / 30

How often must you stop to check your cargo while on the road?

Within the first 25 miles and every 150 miles or every 3 hours thereafter

Every 100 miles or 2 hours

After every break you take during driving

Only at the beginning and end of your trip

27 / 30

What is the maximum allowable blood alcohol concentration (BAC) for CDL drivers while operating a commercial vehicle?

0.08%

0.02%

0.04%

0.00%

28 / 30

Before operating a commercial vehicle, what must you check during the pre-trip inspection?

Oil level and tire pressure

Fuel level only

Brakes and lights only

All of the above

29 / 30

Which class of CDL allows you to drive a tractor-trailer?

Class A

Class B

Class C

Class D

30 / 30

What does CDL stand for?

Commercial Driver's License

Compact Disc License

Commercial Driving Limit

Comprehensive Driving Log

Your score is

The average score is 56%