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The CDL general knowledge test is required to be taken by all CDL applicants. The Maryland 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 Maryland 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 MD 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. ABS:
makes it easier to turn.
allows the wheels to lock up.
helps you avoid wheel lock up.
makes it easier to break.
2. When backing, it is important to use a helper whenever possible. Why?
Because you cannot see everything behind your vehicle.
Because it's required by law.
All the above.
To make sure you don't damage your truck.
3. When checking the engine compartment in a vehicle inspection, you should check all of the following except:
Windshield washer fluid level
Coolant level in radiator
Shock absorbers
Engine oil level
4. Which of the following can cause vehicle fires?
Improper fueling
Short circuits and loose connections
Improperly sealed cargo
All of the above.
5. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
anti-lock brakes.
a rear backup camera.
hydraulic brakes.
6. Which of the following statements about retarders is NOT correct?
Retarders help slow a vehicle, reducing the need for using brakes.
Retarders help you avoid skids.
Retarders reduce reduce brake wear.
You should turn the retarder off whenever the road is wet, icy, or snow covered.
7. Regrooved tires:
cannot be used on the front wheels of buses.
cannot be used on the rear wheels of buses.
cannot be used on the wheels of buses.
None of the above.
8. Class 1 hazardous materials include:
Flammable liquids
Flammable solids
Radioactive materials
9. Front-end header boards:
protect your from glare and eyestrain.
can cause your vehicle to hydroplane.
protect you from your cargo in case of an accident.
protect the cargo from weather.
10. To determine how much space you should keep in front of you, one good says you need at least ______ for each 10 feet of vehicle length at speeds below 40 mph.
3 seconds
2 seconds
1 second
4 seconds
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MD CDL Practice Test

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