CDL General Knowledge Test | Free Online Practice Questions

General knowledge test #1
(english)

General Knowledge Test#1 (en)

1 / 50

You are driving a heavy vehicle and approaching an off-ramp that curves downhill. What is the safest way to exit the highway?

Slow down to a safe speed before the curve.

Increase your speed to match highway traffic.

Maintain your speed until you reach the bottom of the off-ramp.

2 / 50

Which of the following statements about the pre-trip inspection of your brakes and suspension system is true?

Air pressure in the brake lines doesn't need to be consistent.

Brake pads are fine as long as they are not completely worn down.

Brake shoes should not have oil, grease, or brake fluid on them.

3 / 50

What potential issues could arise from having too little weight on the drive axle of a vehicle?

Poor traction.

Increased fuel efficiency

More likely to tip over during turns

4 / 50

What are the possible outcomes of applying wet brakes after driving through heavy rain?

Overheating of engine

Increased fuel consumption

Trailer jack-knife.

5 / 50

How should you handle slippery road conditions?

Make turns as gently as possible.

Increase your speed to pass other vehicles quickly.

Drive with your hazard lights on at all times.

6 / 50

You must come to a complete stop at a railroad crossing when:

The nature of the cargo makes a stop mandatory under the State or Federal regulations.

The crossing is on a single-lane road with limited visibility.

There is no flagman, warning signals or gate at the crossing.

7 / 50

What is accurate regarding the procedure for notifying authorities after an accident?

You must only report accidents that occur on highways.

If you have a cellular phone or CB radio you should notify the authorities before exiting the vehicle.

You can wait until the end of the day to report the accident.

8 / 50

Why is it dangerous if the exhaust system is damaged?

Increases fuel consumption significantly.

Poisonous fumes can enter the cab or sleeping compartment.

Can cause the tires to deflate.

9 / 50

Backing of the commercial vehicle is:

Safe as long as you go slowly.

Easy if you use your mirrors correctly.

Always dangerous.

10 / 50

Identify the true statement related to accelerating a vehicle.

Rough acceleration can cause mechanical damage.

Smooth acceleration is always the safest method in all conditions.

Acceleration increases fuel efficiency at all times.

11 / 50

What is accurate regarding a skid caused by the rear drive wheels locking?

Ona vehicle with a trailer, the trailer can push the towing vehicle sideways.

Applying more brake pressure will stop the skid.

Turning the steering wheel sharply increases control.

12 / 50

At what blood alcohol concentration (BAC) level will you be subject to a 24-hour out-of-service order?

Any detectable amount.

0.04

0.02

13 / 50

Identify the accurate statement concerning overhead clearance.

Always add an extra foot to the clearance measurement for safety.

The weight of a vehicle changes height.

Overhead clearance is not affected by weather conditions.

14 / 50

How should you respond if your vehicle begins to hydroplane?

Release accelerator.

Turn the steering wheel quickly.

Turn on your headlights

15 / 50

Under which circumstance is it advisable to gently tap your brakes to activate the brake lights?

You are about to exit the road and need to slow down.

You need to quickly change lanes.

You're driving in heavy fog.

16 / 50

What statement is accurate concerning drug consumption and driving?

Prescription drugs are allowed if a doctor says they will not affect the driving ability.

Medications bought over-the-counter are always safe for driving.

Taking medication as long as it is not during working hours is allowed.

17 / 50

What statement regarding the behavior of other drivers on the road is true?

Drivers in small cars understand the blind spots of large trucks and always stay clear.

Short term or daily rental truck drivers are often not use to the limited vision, which makes these drivers a hazard.

Drivers on motorcycles always maintain a safe distance from trucks and are never a hazard.

18 / 50

What is a safety measure to follow when setting up reflective triangles?

Hold the triangles between yourself and oncoming traffic.

Wear dark clothing to make sure you don't distract drivers

Place them all in a straight line regardless of road shape.

19 / 50

How far ahead should a driver be looking while operating the vehicle?

10-13 seconds

3-5 seconds

12-15 seconds.

20 / 50

Identify the correct statement from the following.

Most vehicles use less fuel at night than during the day.

Most roads are less crowded at night, reducing the risk of accidents.

Many heavy vehicle accidents occur between midnight and 6 a.m.

21 / 50

Which action should you AVOID when aiding injured individuals at the site of an accident?

Keep injured persons cool.

If a qualified person is helping them, stay out of the way unless asked to assist.

Move severely injured person if there is a danger due to fire or passing traffic.

22 / 50

After turning on the engine:

The battery charge indicator will fully charge in 3-5 minutes.

The air pressure gauge will immediately show full pressure.

The coolant temperature gauge should begin a gradual rise to normal.

23 / 50

What is accurate about the impact of hot weather on tires during driving?

You should inspect your tires every two hours or every 100 miles when driving in very hot weather.

Driving slowly will prevent tires from heating up in hot weather.

Using winter tires will improve traction in hot weather.

24 / 50

Identify the accurate statement regarding the operation and effect of brakes.

Brakes require less force to stop a vehicle as it speeds up.

Brakes work best when they are wet or icy.

The heavier a vehicle or the faster it is moving, the more heat the brakes must absorb to stop it.

25 / 50

Which brake system should be checked when the vehicle is stationary?

Service brake.

Parking brake.

Hydraulic brakes.

26 / 50

When driving at the usual speed on a highway, you should try to look ahead of your car for about ___ miles.

1/4

1/2

1/8

27 / 50

What is true regarding taking emergency or evasive maneuvers?

In order to turn quickly you must have a firm grip on the steering wheel.

Always use the brakes hard to maintain control.

Speeding up is safer than stopping in emergencies.

28 / 50

When driving a large vehicle that moves slower than other traffic, which guideline should you AVOID following?

Stay on the right side of the road.

Signal other drivers when it is safe to pass you.

Use four-way flashers if it is legal in your state.

29 / 50

Select the statement that is false regarding the procedure for reversing a heavy vehicle.

You should back and turn toward the driver's side whenever it is possible.

Because you cannot see, you should back slowly until you slightly bump into the dock.

You should use a helper and communicate with him with hand signals.

30 / 50

Identify the correct practice regarding engine overheating.

You should never remove the radiator cap on a pressurized system until the system is cooled.

You can continue driving as long as the temperature gauge is in the red zone.

Driving with a low coolant level won't cause overheating.

31 / 50

Which of the following statements regarding the pre-trip inspection of your wheels and rims is true?

Wheels do not need to be inspected if they appear clean.

Rust around wheel nuts may mean that they are loose.

Cracks in the wheel rims are safe as long as the wheel turns.

32 / 50

How should you arrange reflective triangles when parking on the roadside of a straight, level, fourlane divided highway?

One within 10 feet of the front of the vehicle, one about 50 feet to the rear, and one about 250 feet to the rear.

One within 5 feet of the rear of the vehicle, one about 50 feet to the rear, and one about 150 feet to the front.

One within 10 feet of the rear of the vehicle, one about 100 feet to the rear, and one about 200 feet to the rear.

33 / 50

What should you do when a heavy load slows you down while ascending an incline?

Increase your speed significantly.

Turn on your hazard lights and stop.

Shift to lower gear.

34 / 50

What is the appropriate action if the drive wheels begin to spin when you start moving from a stationary position?

Turn off the engine.

Increase the engine's speed.

Take your foot off the accelerator.

35 / 50

What statement about loading cargo is correct?

Cargo does not need to be secured if it's under 100 pounds.

Cargo must be inspected every 100 miles.

A state law dictates legal weight limit.

36 / 50

What is the safest method to merge onto the road?

Use your horn to alert others before merging.

Wait for a large enough gap in the traffic to enter the road.

Drive in reverse before merging.

37 / 50

What should you do if you see a hazard on the road ahead?

Use your four-way flashers or brake lights to warn others.

Drive closely to the vehicle ahead to use it as a shield.

Turn on your high beam headlights to signal danger.

38 / 50

What would be your total stopping distance at 55 mph on dry pavement?

The width of a standard car lane

Three times the height of a basketball hoop.

The length of a football field

39 / 50

Specify the conditions under which a driver without a hazardous materials endorsement is allowed to drive a vehicle carrying hazardous substances.

The hazardous materials are contained in a tool box.

The vehicle does not require placards.

The hazardous materials are in a sealed, unbreakable container.

40 / 50

What statement about the use of drugs is correct?

Taking drugs is safe if driving short distances.

Use of drugs can lead to an accident and/or arrest.

Drugs have no effect on driving skills.

41 / 50

What is the right way to hold a steering wheel?

With both hands, on opposite sides of the wheel.

With one hand on the top of the wheel and the other on your lap.

With your knees, while using your hands to adjust the radio.

42 / 50

To figure out how much alcohol is in someone's blood (BAC), you need to know:

Their height.

Their weight.

The time of day they drink alcohol

43 / 50

Select the correct statement regarding the transportation of hazardous materials.

Hazardous materials can be disposed of in regular trash bins if the containers are sealed.

Any truck carrying any amount of hazardous materials must have placards.

All hazardous materials present health and safety danger.

44 / 50

If your vehicle is missing or more leaves from any leaf spring, it won't be allowed to be used.

1/4

1/2

1/3

45 / 50

Identify the incorrect statement regarding alcohol consumption.

Adrinker can control how fast his or her body absorbs alcohol.

Alcohol goes directly from the stomach to the blood stream.

BAC is determined by how fast you drink; how much you drink and how much you eat.

46 / 50

Under what circumstances should you sound your horn?

To let others know you are running late.

To say hello to a friend on the sidewalk.

If it helps to avoid a crash.

47 / 50

Among these vehicles, which is more likely to experience off-tracking during turns?

Tractor with 45-feet trailer.

28-feet box truck

45-feet straight truck

48 / 50

Which of these statements about driving through a tunnel is correct?

There may be strong winds when exiting.

Turn off all lights inside the truck.

Keep windows open for fresh air.

49 / 50

Documents related to hazardous materials transportation must be stored __.

Attached to the sun visor.

In a box on the trailer.

In the pouch of the driver door.

50 / 50

What should you do when merging?

Merge at a much lower speed than the flow of traffic.

Use your mirrors to make sure the gap in traffic is large enough for you to enter safely.

Merge without signaling.

Your score is

The average score is 81%

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General knowledge test #2(english)

General knowledge test #3(english)

General knowledge test #4(english)

What is the CDL General Knowledge Test?

The CDL General Knowledge test is a written exam that covers a wide range of topics related to safe vehicle operation, traffic laws, and general knowledge that commercial drivers need to know. The test is designed to ensure that drivers have a basic understanding of the rules of the road and the skills necessary to operate a commercial vehicle safely.

Who Needs to Take the CDL General Knowledge Test?

Anyone who wants to obtain a CDL is required to take and pass the General Knowledge test. This includes drivers who want to operate:

Tractor-trailers
Buses
Tanker trucks
Vehicles carrying hazardous materials
Other commercial vehicles

Why are Practice Tests Important?

Practicing for the CDL General Knowledge test is crucial for success. Here’s why:

Familiarization: Practice tests help you become familiar with the format of the real exam, the types of questions you’ll encounter, and the time constraints.
Knowledge Assessment: They allow you to assess your current knowledge and identify areas where you need to focus your studies.
Confidence Building: Taking practice tests and seeing your progress can boost your confidence and reduce test anxiety.
Improved Performance: Studies have shown that students who use practice tests perform significantly better on exams.

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General Knowledge Test #1(en)

General knowledge test #1
(english)

General knowledge test #2(english)

General knowledge test #3(english)

General knowledge test #4(english)

What is the CDL General Knowledge Test?

Who Needs to Take the CDL General Knowledge Test?

Why are Practice Tests Important?

General Knowledge Test #1(en)

General knowledge test #1(english)

General knowledge test #2(english)

General knowledge test #3(english)

General knowledge test #4(english)

What is the CDL General Knowledge Test?

Who Needs to Take the CDL General Knowledge Test?

Why are Practice Tests Important?

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Thank you for your interest.

General knowledge test #1
(english)