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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. Why should you put the starter switch key in your pocket during the pre-trip inspection?
So no one moves the vehicle while you are inspecting underneath it.
You will need it to inspect the trailer.
So you don't lose it.
All of the above.
2. It is safer to drive over (rather than to avoid) which of the following?
Plastic containers
Paper and cloth sacks
Cardboard boxes
None of the above.
3. When you have to back, use a helper whenever possible. Before you begin backing, work out a set of hand signals that you both understand. It is especially important to agree on a signal for:
"Get closer"
4. Which surface is the most slippery?
Dry road
Wet pavement
Ice that is not wet
Wet ice
5. The safety valve installed in the first tank the air compressor pumps air is set to open:
at 30 psi.
every 15 minutes.
if there is too little pressure.
if there is too much pressure.
6. When inspecting your vehicle, before checking the engine compartment be sure that:
all lights are working.
the fire extinguisher is properly charged and rated.
all tires are properly inflated.
the parking brakes are on and/or wheels chocked.
7. Before driving a vehicle with a dual brake brake system, the driver should:
pump the brake pedal 10 times to build pressure.
allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
wait at least 10 minutes before driving.
wait at least 5 minutes before driving.
8. Which of the following is not a braking system on a truck?
Parking brake
Emergency brake
Service brake
Steering brake
9. Which of these is NOT a thing to do when caring for the injured at the scene of a crash?
Move a severely injured person if the danger of fire or passing traffic makes it necessary.
If a qualified person is helping the injured, stay out of the way unless asked to assist.
Stop heavy bleeding by applying direct pressure to the wound.
Keep the injured persons cool.
10. If your ABS malfunctions:
the parking brakes will not work.
the service brake will not work.
you still have normal brake functions.
you should immediately come to a complete stop.
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MD CDL Practice Test

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