Last updated on May 5, 2023
This General Knowledge Practice Test 2 contains general knowledge and safe driving information that all commercial drivers should know to successfully pass the CDL “General Knowledge” written test.
General Knowledge Practice Test #2 Methods:
Number of practice test questions with answers: 50
Number of correctly answered practice test questions needed to pass: 40
Passing score: 80%
This CDL General Knowledge Practice Test #2 with Answers is applicable for all 50 States.
General Knowledge Practice Test #1 CDL General Knowledge Practice Test (#2) With Answers: #1. Where should you place emergency warning devices when stopped on a one-way or divided highway?
One at 10 feet, one at 100 feet, and one at 200 feet towards approaching traffic
One at 15 feet, one at 150 feet, and one at 300 feet towards approaching traffic
One at 10 feet in front of your vehicle, one at 100 feet, and one at 200 feet behind your vehicle
One at 15 feet in front of your vehicle, one at 150 feet, and one at 200 feet behind your vehicle #2. When should you make mirror adjustments?
After you have completed your trip
Prior to starting any trip
Mirrors adjust automatically, so there is no need for manual adjustments
Mirror adjustments can only be made by a certified mechanic #3. Entry-Level Driver Training (ELDT) is required for obtaining all of the following CDL endorsements for the first time, EXCEPT:
Hazardous Materials (H)
Tank Vehicle (N)
School Bus (S) #4. Which of the following things related to cargo are drivers responsible for?
Recognizing overloads and poorly balanced weight
Knowing your cargo is properly secured and does not obscure your view ahead or to the sides
All of the answers are correct #5. What is the minimum number of tie-downs for a 20-foot load?
At least 1 tie-down
At least 2 tie-downs
At least 3 tie-downs
Tie-downs would not be necessary #6. Which of the following statements about backing a commercial motor vehicle (CMV) is NOT true?
Backing is always dangerous
You should avoid backing
Using a helper is never necessary
Park the vehicle so you can drive forward when leaving #7. How do antilock brakes systems (ABS) help you?
ABS helps you avoid a crash by locking up the drive axle brakes
ABS helps you avoid wheel lock up and maintain control
ABS helps you avoid having to manually adjust your brake slack adjusters
ABS helps you avoid brake fade on steep downhill grades #8. In the event of an accident, you should remember to do the following EXCEPT:
Move the victims out of the way immediately
Protect the area
Stop any bleeding and keep the victims warm #9. Which of the following is NOT a cause of vehicle fires?
Cargo #10. What is the distance you can see ahead of your vehicle with low beams?
450 feet #11. All of the following are key steering system parts, EXCEPT:
Torque rod #12. How long does it take for a typical tractor-trailer unit to clear a double railroad track?
16 seconds #13. Antilock braking systems (ABS) are defined as a ____________ system that prevents the wheels from locking up during hard braking applications.
All of the answers are correct #14. When driving at night, you should use low beam headlights whenever you can. #15. If you have two (2) violations of an out-of-service order within a ten (10) year period while transporting nonhazardous materials, how long will you lose your CDL for?
At least 1 year
At least 2 years
At least 6 years
At least 10 years #16. What causes most front-wheel skids?
Having too much weight on the front axle
Driving too slow for conditions
Driving too fast for conditions
All of the answers are correct #17. Which of the following is a situation where legal maximum weights may not be safe?
Bridges and overpasses
Freeway on and off ramps #18. If you are asked to haul a placarded load and you do not have a hazardous materials endorsement on your CDL, you should:
Obtain written approval from your dispatcher
Take the placards off the vehicle before driving
Obtain written approval from a DOT official
Refuse to take the load #19. How far ahead should you look when driving?
5 to 10 seconds
1 to 2 seconds
12 to 15 seconds
2 to 5 seconds #20. All of the following are ways to eliminate in-vehicle distractions, EXCEPT:
Identify in-vehicle distractions before driving
Have a plan to eliminate possible distractions
Expect distractions to occur
Engage in intense conversations with other occupants of the vehicle #21. Commercial motor vehicles (CMVs) must be equipped with all of the following types of emergency equipment, EXCEPT:
Passenger side air bags
Warning devices for parked vehicles #22. Which of the following is NOT a true statement about vehicle inspections:
Federal and state laws require that drivers inspect their vehicle
Federal and state inspectors may inspect your vehicle
Federal and state inspectors may not inspect your vehicle
Federal and state inspectors can put your vehicle “out-of-service” until fixed if they find it to be unsafe #23. What is a good rule for managing the space ahead of your vehicle when travelling under 40 mph?
At least 2 seconds of travel time for every 10 feet of vehicle length
At least 4 seconds of travel time for every 10 feet of vehicle length
At least 1 second of travel time for every 10 feet of vehicle length
At least 3 seconds of travel time for every 10 feet of vehicle length #24. During a trip, all of the following critical items should be checked whenever you stop, EXCEPT:
Tires, wheels, and rims
Lights and reflectors
Fire extinguisher, flares, and emergency warning devices #25. All of the following should be given extra attention during your vehicle inspection before driving in the winter, EXCEPT:
Defrosting and heating equipment
Air conditioning system
Windshield wipers and washers #26. Which of the following does NOT need to be included on an Individual Vehicle Distance Record (IVDR)?
The vehicle identification number
The dates of a trip
The weight of the vehicle
The total distance traveled #27. If engine coolant has to be added to coolant system that does not have an overflow or recovery tank, you should do all of the following, EXCEPT:
Turn off the engine and wait for it to cool
Turn the radiator cap slowly to release the pressure
Check coolant level and add more if needed
Leave the engine running and remove the radiator cap while it is still hot #28. When changing lanes, you should do all of the following, EXCEPT:
Signal before you change lanes
Signal only when other drivers are near
Change lanes slowly
Change lanes smoothly #29. Dry bulk tanks require special care because they _________ and the load can shift.
Have a high center of gravity
Have no baffles
Have no bulkheads
Have a low center of gravity #30. When backing, what is the most important hand signal that you and the helper should agree on? #31. What is “black ice”?
Water that mixes with oil on the road surface and freezes
Ice that has melted on the road surface
A thin layer of ice that makes the road surface look wet
Melted ice that has refrozen on the road surface #32. A driver must notify their employer within 30 days of a conviction for any traffic violations (except parking) while operating what type of vehicle?
Operating any type of vehicle at the time of the violation
Operating a CMV at the time of the violation
Operating their personal vehicle at the time of the violation
Operating a motorcycle at the time of the violation #33. Stopping is NOT always the safest thing to do in an emergency. #34. Which of the following can cause tire fires?
Low tire tread depth
All of the answers are correct #35. All of the following should be considered if you must drive in foggy conditions, EXCEPT:
Listen for vehicles that cannot be seen
Make sure the radio volume is high enough to keep you alert
Don’t stop on the side of the road unless unavoidable
Use roadside reflectors to help see curves in the road #36. All of the following are examples of road hazards, EXCEPT:
Escape ramps on steep downhill grades
Emergency personnel (police, fire, EMS) working on the road
Freeway on and off ramps #37. Which of the following statements about alcohol is true?
If you eat before you drink you won’t get as drunk
Drinking coffee will help you stay sober
Fresh air will help you sober up
A few beers are the same as a few shots of whiskey or a few glasses of wine #38. An engine retarder is designed to:
Slow the vehicle down without using brakes
Work only with automatic transmissions
Work only with manual transmissions
Work only when you accelerate #39. The four basic types of retarders are:
Air, exhaust, electric, and hydraulic
Hydraulic, friction, electric, and engine
Engine, electric, exhaust, and hydraulic
Friction, exhaust, air, and electric #40. What factors determine your selection of a “safe” speed when going down a long, steep downgrade?
Weight of the vehicle and cargo
The length of the grade
The steepness of the grade
All of the answers are correct #41. Wet brakes can cause all of the following, EXCEPT:
Lack of braking power
Pulling to one side or the other
Overheated brake drums and linings #42. What is “sleep debt”?
Not picking up a load on time because you over-slept
Not delivering a load on time because you over-slept
The cumulative effect of not getting enough sleep over time
None of the answers are correct #43. A “hazard” is defined as any road user or road condition that is a possible danger. #44. If you find that you are being tailgated, you should:
Quickly change lanes to avoid an accident
Flash your brake lights to warn the tailgater
Decrease the distance between you and the tailgater
Increase your following distance to open up room in front of you #45. A “pull-up” is defined as straightening and repositioning your vehicle when backing a trailer by pulling forward as often as necessary. #46. What three things add up to total stopping distance?
Reaction time + road conditions + time it takes to stop
Perception distance + reaction distance + braking distance
Perception time + reaction time + road conditions
Reaction distance + road conditions + weight of vehicle #47. Which of the following types of commercial motor vehicles (CMVs) can get stuck on a railroad-highway crossing?
Possum-belly livestock trailers
All of the answers are correct #48. All of the following are suspension system defects, EXCEPT:
Cracked, broken, or missing slack adjusters
Cracked, broken, or missing leaf springs
Cracked, broken, loose, or missing axle positioning parts
Cracked, broken, loose, or missing spring hangers #49. Which of the following is NOT a basic vehicle control skill required to safely operate a commercial motor vehicle (CMV)?
Stopping #50. Which of the following is a proper braking technique when going down a long, steep downgrade?
Apply the brakes just enough to feel the vehicle slowing
Apply the trailer hand (“trolley”) brake as needed
Apply the parking brake as needed
All of the answers are correct General Knowledge Practice Test #1 PRACTICE TEST QUESTIONS AND ANSWER SOURCES:
The pool of questions used to produce this practice test have been independently created by CDL Digest and come directly from Code of Federal Regulations (Title 49 – Transportation) and the information provided in AAMVA’s “2005 CDL Test System (July 2010 or newer Version) Model Commercial Driver Manual”.
These are the same sources that
all 50 State Driver Licensing Agencies (SDLA) are required to use by federal regulation (49 C.F.R. 383.133) to develop the pool of questions for all written tests needed for a person to obtain a commercial learner’s permit (CLP), commercial driver’s license (CDL), and/or any federally authorized endorsements.
Note: The above listed source information is static, meaning changes to the pool of questions that your State Driver Licensing Agency (SDLA) uses for the actual written test have been extremely rare over the decades. Do to the static nature of the source information, you may see practice test questions and answers in this practice test that are very similar, if not identical to the questions and answers on the actual written test. If this occurs, it is purely coincidental. CDL Digest is not affiliated with the AAMVA or any government agency.
PRACTICE TEST DIFFICULTY:
The source material used by CDL Digest to develop these practice test questions is very technical. Relying solely on the practice tests we have produced will not be enough to successfully pass the actual written tests. You will NEED to study in order to successfully pass these practice tests and the actual written tests.
Class “A” Commercial Learner’s Permit Study Guide Class “B” Commercial Learner’s Permit Study Guide Complete CDL Study Guide
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