CDL Permit Practice Test (50 Questions Answers)

CDL Permit Practice Test (50 Questions Answers): In order to get this special license, you must first take and pass the required CDL knowledge test and skills tests. Using this free sample test correctly will prepare you to take and pass these tests. This practice test is consist of 50 questions and is followed by an answer key.

Taking our free CDL Permit Practice Test and any other practice Endorsement Tests that apply to your vehicle type, and studying the explanations of the correct answers for the practice tests, you can find out how well you are prepared for the actual Commercial Driver’s License Exam and what material you need to review again.

CDL Permit Practice Test (50 Questions Answers)

Test Name	CDL Practice Test 2025
Language	English
License	CDL (Class A, B, or C),
Total Questions	50 Knowledge Practice Test
Test For	Commercial Driver License
Test Preparation	Driving Knowledge
Country	USA
Explanation	No

0 votes, 0 avg

CDL General Knowledge Test 6

1 / 50

A broken coolant hose while driving

A) causes the heater to fail.

B) causes the air-conditioner to fail.

C) increases the chances of tire failure.

D) can cause a fire

2 / 50

What is black ice?

A) Clear ice

B) Freshly paved tar

C) Fog or mist

D) Oil

3 / 50

Which of the following is the best way to slow the vehicle when driving down a hill?

A) Downshift before the hill and keep light, continuous pressure on the brakes.

B) Shift gears to neutral.

C) Apply heavy pressure on the brakes from time to time.

D) Shift to a higher gear.

4 / 50

Where and when is it best to downshift?

A) Before entering a curve

B) After starting up a hill

C) Before speeding up

D) After starting down a hill

5 / 50

To go down a long, steep hill you should

A) shift to a low gear before starting down the grade.

B) shift to a high gear before starting down the grade.

C) apply your brakes hard.

D) shift to a low gear after starting down the grade.

6 / 50

What causes brakes to fade?

A) Coasting

B) Frozen brake pads

C) Using the brakes too lightly when going downhill

D) Slowing down from high speeds too quickly

7 / 50

If you must pull over to the shoulder on a major highway, you should

A) turn onto the shoulder without braking.

B) keep one set of wheels on pavement, if possible.

C) brake quickly several times to flash your brake lights.

D) use the controlled braking method.

8 / 50

Which of the following emergency equipment should be carried in the truck at all times?

A) All of the above

B) spare electrical fuses (if the truck has fuses)

C) a fully charged 5 B:C fire extinguisher

D) reflective warning triangles or flares

9 / 50

You are driving a 60-foot rig at 55 mph. How many seconds of space should you have between you and the vehicle ahead?

A) 6 seconds

B) 7 seconds

C) 8 seconds

D) 5 seconds

10 / 50

You are stopped on the shoulder of a curve that prevents approaching traffic from seeing your vehicle. How far back should you place your last warning device?

A) 200 feet

B) 10 feet

C) 500 feet

D) 100 feet

11 / 50

Your brakes have failed on a downgrade. Using an escape ramp, downshifting and ____________________ are helpful in slowing the vehicle.

A) countersteering

B) using your horn

C) using the braking effect of the engine

D) shifting to a higher gear

12 / 50

You are stopped on an incline. How do you keep from rolling back?

A) Engage the clutch

B) Pump the accelerator hard

C) Put on the parking brake

D) Shift to neutral

13 / 50

he proper distance to use high beams is at least _______________ away from an approaching vehicle.

A) 25 feet

B) 1,000 feet

C) 50 feet

D) 500 feet

14 / 50

The controlled braking method is used

A) to make the wheels lock.

B) by applying the brakes slowly.

C) by applying the brakes as hard as you can without locking the wheels.

D) when making large steering wheel movements

15 / 50

Which of the following should you examine when inspecting the front of your vehicle?

A) Condition of shock absorbers

B) Condition of brakes

C) Condition of steering system

D) All of the above

16 / 50

Which of the following is one of the potential causes of fire in the electrical system?

A) Flammable cargo

B) Duals that touch

C) Poor ventilation

D) Short circuits due to damaged insulation

17 / 50

f one-fourth of a multileaf spring is missing, which of the following is most likely to happen?

A) It will have no effect.

B) It will cause a pop-pop-pop sound.

C) It will put the vehicle out of service.

D) It will make it hard to steer.

18 / 50

Which of the following is a sign of a tire failure?

A) A loud “bang”

B) Vibration

C) All of the above

D) The steering wheel pulls to one side

19 / 50

Why don’t new trucks use the same gear for going down a hill as they would for going up a hill?

A) They have weaker engines.

B) They have more air drag.

C) They have low friction parts.

D) They take up more fuel.

20 / 50

If the steering feels heavy or hard, it is probably a sign of

A) tire problems.

B) battery failure.

C) engine problems.

D) worn brakes.

21 / 50

Which of the following statements is true about alcohol?

A) Alcohol increases your ability to drive.

B) If you eat a lot first, you will not get drunk

C) Some people are not affected by alcohol

D) A few beers are the same as a few shots of whiskey.

22 / 50

You are driving a large vehicle that cannot make a right turn without swinging into another lane. Which of the following figures shows the correct way to make the turn?

A) Figure D

B) Figure C

C) Figure B

D) Figure A

23 / 50

What is the correct placement of warning devices when parked on the shoulder of a one-way or divided highway?

A) At 100 feet and 500 feet from the front of the vehicle

B) At 10 feet, 100 feet, and 200 feet from the front of the vehicle

C) At 10 feet, 100 feet, and 200 feet from the rear of the vehicle

D) At 100 feet and 500 feet from the rear of the vehicle

24 / 50

If you have to steer away from what’s ahead in order to avoid a crash, which of the following is the best action to take?

A) Turn, then countersteer once you have cleared the obstacle

B) Apply the brakes while turning.

C) Hit the brakes.

D) Turn very sharply to clear whatever is in your way

25 / 50

Why must you tab or keep shipping papers related to hazardous materials in special places?

A) Because they must be delivered first

B) Because you must know what products you can load together, and which you cannot

C) In case there are no placards

D) f the driver is in an accident and cannot speak, people must know the hazards involved.

26 / 50

You wish to turn left from one multilane two-way street into another multilane two-way street. Which of the figures below shows how the turn should be made?

A) Figure c

B) Figure b

C) Figure A

D) Figure d

27 / 50

What are the three types of safety equipment that you must have before driving?

A) Spare fuses, three red reflective triangles, and a fire extinguisher

B) Spare fuses, tire chains and a fire extinguisher

C) An accident reporting kit, three red reflective triangles, and tire- changing equipment

D) Tire-changing equipment, spare fuses, and a fire extinguisher

28 / 50

You are approaching a vehicle for a pre-trip inspection. What should be the first step?

A) Putting the vehicle key in your pocket

B) Writing a written report on the condition of the vehicle

C) Fastening your seatbelt

D) Starting the engine

29 / 50

To extinguish an electrical fire,

A) use a lot of water.

B) use the B:C extinguisher on the base of the fire.

C) use the A:B:C extinguisher on the flames of the fire.

D) pull into a service station and wait for qualified firefighters.

30 / 50

What is the total stopping distance when driving a heavy vehicle on dry pavement at 55 mph?

A) 7 1/2seconds

B) 4 1/2 seconds

C) 6 seconds

D) 5 seconds

31 / 50

How much tread depth should you have on your front tires when driving in the winter?

A) Minimum of 2/32 inch

B) Maximum of 2/32 inch

C) Under 4/32 inch

D) Minimum of 4/32 inch

32 / 50

You should inspect the tires every _________ when driving in very hot weather.

A) two hours or every 100 miles

B) four hours or every 400 miles

C) one hour or every 50 miles

D) three hours or every 150 miles

33 / 50

If the radiator shutters freeze shut when driving in the winter, which of the following will occur?

A) Carbon monoxide will leak into your vehicle.

B) The engine may overheat and stop.

C) It will be harder to steer.

D) The brakes will freeze.

34 / 50

You are driving on slippery ice. Your rear-drive wheels lock and you begin to skid. Which of the following is the best action to take?

A) Take your foot off the accelerator and push the brake.

B) Take your foot off the accelerator and push in the clutch.

C) Brake hard and pull off the road.

D) Shift to neutral.

35 / 50

At speeds below 40 mph, you need at—————for each————of vehicle length.

A) two seconds; 10 feet

B) one second; 20 feet

C) one second; 10 feet

D) two seconds; 30 feet

36 / 50

Which of the following is one of the best ways to deal with tailgaters in heavy traffic?

A) Speed up to increase the distance between you and the tailgater.

B) Increase your following distance.

C) Turn on your tail lights.

D) Brake quickly several times to flash your brake lights.

37 / 50

A tie rod is part of the ________ system.

A) suspension

B) steering

C) brake

D) exhaust

38 / 50

You are driving on a highway and your front tire has just blown out. You should

A) stay off the brake until you have slowed down.

B) pump the brakes.

C) brake hard.

D) keep driving until you find a service station.

39 / 50

How often must drivers of trucks and truck tractors conduct a safety inspection?

A) After driving

B) Every 5 hours and after driving

C) Before driving, every 3 hours during driving, and after driving

D) Before driving

40 / 50

When driving down a steep curve in the snow, you should

A) turn as gently as possible.

B) use the engine brake.

C) use the speed retarder.

D) brake hard.

41 / 50

Which of the following is true about overhead clearance?

A) A loaded truck is higher than an empty one.

B) Posted heights are always correct.

C) Repaving or packed snow increases the clearance height.

D) An empty van is higher than a loaded van.

42 / 50

You are driving on a rainy day and the drive wheels begin to spin. To keep control of the vehicle, which of the following is the best action to take?

A) Accelerate slightly

B) Take your foot off the accelerator

C) Brake hard

D) Steer to the left or right

43 / 50

What is the proper way to make a right turn when you are driving a long vehicle?

A) Turn wide to the left as you start the turn.

B) Turn quickly to stop other drivers from hitting you.

C) Keep the rear of the vehicle far away from the curb

D) Turn wide as you complete the turn.

44 / 50

One of the steps in shifting up is to

A) push in the clutch and shift to the higher gear at the same time

B) press the accelerator and shift to neutral.

C) increase engine and gear speed to the RPM required.

D) release the clutch and shift to neutral.

45 / 50

What is a tractor jackknife?

A) A drive-wheel skid

B) A device used in the hydraulic system

C) Another name for hard steering

D) A type of trailer truck

46 / 50

Some vehicles have automatic transmissions. Why is it important to select a low range when going down grades?

A) To allow the transmission to shift up

B) To get greater engine braking

C) To prevent hydroplaning

D) To prevent a hydraulic brake failure

47 / 50

the best kind of driver is a(n) __________ one.

A) Offensive

B) safety first-minded and defensive

C) slow

D) sober

48 / 50

When backing a trailer,

A) use the highest reverse gear.

B) turn and back toward the right side.

C) urn the steering wheel in the opposite direction you want to go.

D) turn the steering wheel toward the direction you want to go.

49 / 50

Which of the following is true about empty trucks?

A) They are easier to steer.

B) They have better traction.

C) They require greater stopping distance.

D) They require less braking power.

50 / 50

Controlled braking is

A) braking so that the wheels lock

B) stab braking lock.

C) releasing the brakes slowly.

D) jamming on the brakes.

Your score is

The average score is 74%

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