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The CDL general knowledge test is required to be taken by all CDL applicants. The Minnesota 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 Minnesota 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 MN 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. Which of the following are possible causes of tire fires?
Improperly loaded cargo and dual tires that touch.
Over-inflated tires and short circuits.
Under-inflated tires and dual tires that touch.
Loose fuel connections or under-inflated tires.
2. Baffles:
help to control the side-to-side liquid surge.
help to control the forward and backward liquid surge.
separate the load.
help to prevent cargo overload.
3. As long as the engine is not overheated, it is safe to remove the radiator cap.
True, as long as you are wearing gloves.
True, unless you can touch the radiator cap with your bare hand.
4. What should you do if your brakes fail while driving downhill, and no escape ramp is available?
wait until you can find an escape ramp.
use your parking brake to stop.
call for assistance before you get out of your vehicle.
take the least hazardous escape route you can - and make the move as soon as possible.
5. If the drive wheels start to skid:
accelerate slightly to regain control.
push in the clutch to let them turn freely.
use the brakes to slow down.
All of the above.
6. When you have to back, you should always try to back toward the driver's side because:
backing toward the left side is more dangerous.
you can see better and watch the rear of your vehicle out the side window.
it feels more natural.
None of the above.
7. _____ is a thin layer of ice that forms on road surfaces.
Grey ice
Black ice
Blue ice
White ice
8. If you are feeling drowsy, before driving you should:
drink some coffee.
wait at least 30 minutes.
drink soda.
get some sleep.
9. Front-end header boards:
protect the cargo from weather.
can cause your vehicle to hydroplane.
protect your from glare and eyestrain.
protect you from your cargo in case of an accident.
10. To prevent fire, during the en route inspection you should check the tires, wheels, and truck body for signs of:
a fire extinguisher.
front-wheel skids.
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MN CDL Practice Test

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