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The CDL general knowledge test is required to be taken by all CDL applicants. The Idaho CDL test consists of 50 questions. To pass, you must correctly answer at least 40 questions (80%). The general knowledge test covers the contents of the Idaho CDL Manual. All CDL applicants (Class A, B and C) must study the following sections: Driving Safely, Transporting Cargo Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Vehicle Inspection Test, Basic Control Skills Test, Road Test. In addition, the Class A CDL test will include questions based on the Combination Vehicles section. Take this CDL practice test now to prepare for the actual ID general knowledge test! To get your CDL, you must pass both the knowledge and skills tests. CDL knowledge tests include: General Knowledge, Passenger Transport, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker Vehicles, Doubles/Triples, School Bus, Firefighter. Depending on what class of license (A, B or C) and endorsements you need, you must take one or more knowledge tests. A special endorsement is also required to drive certain types of vehicles. The following endorsements may be used with a Class A, B or C CDL: HazMat (H), Tank Vehicles (N), Tank Vehicles Transporting Hazardous Materials (X) and Passenger Transport (P). The School Bus endorsement (S) is only available for Class A or B CDL, and the Doubles/Triples endorsement (T) is only available for Class A driver's licenses.
1. After a tire has been changed, the driver should stop a short while later to:
decrease tire pressure.
check the tightness of the nuts.
deflate the tire to 10 psi.
2. What should you do at an accident scene, among other things, to help prevent another accident?
Put on your 4-way emergency flashers.
If you are stopping to help, park in the area immediately around the accident.
Stay in your vehicle and file an accident report.
3. When you see a hazard that will require slowing down, you should:
warn the drivers behind by flashing your brake lights.
alert the drivers behind by pointing and sounding your horn.
immediately come to a compolete stop.
4. How can you tell if your vehicle is equipped with ABS?
Look for yellow ABS malfunction lamps on the instrument panel.
Trailers will have yellow ABS malfunction lamps on the left side.
All of the above.
5. When driving, you should check mirrors regularly to know where other vehicles are around you. Remember that:
convex mirrors make things look larger and closer than they really are.
you should check your after the start of any trip to make sure they are properly adjusted.
there are blind spots that your mirrors cannot show you.
6. How can you determine your following distance?
Pass a stationary object and count how many seconds it takes the vehicle ahead of you to reach that same object.
When the vehicle ahead of you passes a stationary object on the side of road, start counting the seconds it takes you to reach that same object.
When the vehicle ahead of you passes a stationary object such as a sign along the road, use the stopwatch on your smartphone to determine how long it takes you to reach that same object.
7. What is true about tire chains?
You should watch the official video tutorial by the manifacturer before putting them on.
You must carry the at least 6 chains and extra cross-links.
You should learn how to put the chains on before you need to do it in snow.
8. When checking the engine compartment, which of the following should you check?
Battery fluid level.
Engine oil level.
All of the above.
9. The tire load for each tire is stated:
on the inside of the tire.
on the tread of the tire.
on the side of the tire.
10. When looking ahead of your vehicle while you are driving, you should:
shift your attention back and forth, near and far.
look as far as your peripheral vision can see.
look to the left side of the road.
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ID CDL Knowledge Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
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