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 2024
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

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) Take your foot off the accelerator

B) Steer to the left or right

C) Brake hard

D) Accelerate slightly

2 / 50

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

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

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

C) use the controlled braking method.

D) turn onto the shoulder without braking.

3 / 50

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

A) battery failure.

B) worn brakes.

C) engine problems.

D) tire problems.

4 / 50

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

A) 6 seconds

B) 4 1/2 seconds

C) 7 1/2seconds

D) 5 seconds

5 / 50

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

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

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

C) Turn wide as you complete the turn.

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

6 / 50

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

A) Under 4/32 inch

B) Minimum of 4/32 inch

C) Maximum of 2/32 inch

D) Minimum of 2/32 inch

7 / 50

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

A) brake hard.

B) pump the brakes.

C) keep driving until you find a service station.

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

8 / 50

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

A) It will put the vehicle out of service.

B) It will have no effect.

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

D) It will make it hard to steer.

9 / 50

The controlled braking method is used

A) to make the wheels lock.

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

C) when making large steering wheel movements

D) by applying the brakes slowly.

10 / 50

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

A) All of the above

B) a fully charged 5 B:C fire extinguisher

C) reflective warning triangles or flares

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

11 / 50

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

A) using the braking effect of the engine

B) shifting to a higher gear

C) countersteering

D) using your horn

12 / 50

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

A) Spare fuses, tire chains and a fire extinguisher

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

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

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

13 / 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 take up more fuel.

B) They have weaker engines.

C) They have low friction parts.

D) They have more air drag.

14 / 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) release the clutch and shift to neutral.

C) press the accelerator and shift to neutral.

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

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

A tie rod is part of the ________ system.

A) exhaust

B) steering

C) suspension

D) brake

17 / 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) 100 feet

B) 500 feet

C) 10 feet

D) 200 feet

18 / 50

Which of the following statements is true about alcohol?

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

B) Alcohol increases your ability to drive.

C) Some people are not affected by alcohol

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

19 / 50

Which of the following is true about overhead clearance?

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

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

C) Repaving or packed snow increases the clearance height.

D) Posted heights are always correct.

20 / 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 A

B) Figure B

C) Figure D

D) Figure C

21 / 50

Controlled braking is

A) stab braking lock.

B) jamming on the brakes.

C) releasing the brakes slowly.

D) braking so that the wheels lock

22 / 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 rear of the vehicle

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

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

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

23 / 50

What is black ice?

A) Freshly paved tar

B) Clear ice

C) Fog or mist

D) Oil

24 / 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 brakes will freeze.

C) It will be harder to steer.

D) The engine may overheat and stop.

25 / 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 very sharply to clear whatever is in your way

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

C) Hit the brakes.

D) Apply the brakes while turning.

26 / 50

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

A) one second; 10 feet

B) one second; 20 feet

C) two seconds; 10 feet

D) two seconds; 30 feet

27 / 50

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

A) Increase your following distance.

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

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

D) Turn on your tail lights.

28 / 50

What causes brakes to fade?

A) Slowing down from high speeds too quickly

B) Coasting

C) Using the brakes too lightly when going downhill

D) Frozen brake pads

29 / 50

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

A) The steering wheel pulls to one side

B) Vibration

C) All of the above

D) A loud “bang”

30 / 50

To go down a long, steep hill you should

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

B) apply your brakes hard.

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

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

31 / 50

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

A) Offensive

B) sober

C) slow

D) safety first-minded and defensive

32 / 50

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

A) Pump the accelerator hard

B) Engage the clutch

C) Put on the parking brake

D) Shift to neutral

33 / 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) Apply heavy pressure on the brakes from time to time.

C) Shift to a higher gear.

D) Shift gears to neutral.

34 / 50

Which of the following is true about empty trucks?

A) They have better traction.

B) They require less braking power.

C) They require greater stopping distance.

D) They are easier to steer.

35 / 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 prevent a hydraulic brake failure

C) To get greater engine braking

D) To prevent hydroplaning

36 / 50

Where and when is it best to downshift?

A) Before speeding up

B) Before entering a curve

C) After starting up a hill

D) After starting down a hill

37 / 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) 5 seconds

B) 7 seconds

C) 6 seconds

D) 8 seconds

38 / 50

A broken coolant hose while driving

A) causes the air-conditioner to fail.

B) increases the chances of tire failure.

C) can cause a fire

D) causes the heater to fail.

39 / 50

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

A) one hour or every 50 miles

B) three hours or every 150 miles

C) four hours or every 400 miles

D) two hours or every 100 miles

40 / 50

To extinguish an electrical fire,

A) use a lot of water.

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

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

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

41 / 50

What is a tractor jackknife?

A) A type of trailer truck

B) A drive-wheel skid

C) A device used in the hydraulic system

D) Another name for hard steering

42 / 50

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

A) Poor ventilation

B) Short circuits due to damaged insulation

C) Flammable cargo

D) Duals that touch

43 / 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 b

B) Figure A

C) Figure c

D) Figure d

44 / 50

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

A) 25 feet

B) 50 feet

C) 500 feet

D) 1,000 feet

45 / 50

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

A) Fastening your seatbelt

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

C) Starting the engine

D) Putting the vehicle key in your pocket

46 / 50

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

A) turn as gently as possible.

B) use the engine brake.

C) brake hard.

D) use the speed retarder.

47 / 50

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

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

B) Every 5 hours and after driving

C) After driving

D) Before driving

48 / 50

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

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

B) In case there are no placards

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

D) Because they must be delivered first

49 / 50

When backing a trailer,

A) use the highest reverse gear.

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

C) turn and back toward the right side.

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

50 / 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) Shift to neutral.

C) Brake hard and pull off the road.

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

Your score is

The average score is 74%

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