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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. For proper steering, steering wheel play should be no more than:
50 degrees.
25 degrees.
30 degrees.
10 degrees.
2. Name two situations in which it may not be safe to operate your vehicle at legal maximum weights.
Over bridges or through tunnels
During bad weather or in mountains
In heavy traffic or at night
All of the above.
3. If the low air pressure warning light comes on, you should:
continue to drive normally.
set the parking brake.
stop immediately.
call for help.
4. If you get stuck on railroad tracks, you should:
get out of the vehicle and away from the tracks.
have a helper push your vehicle.
check the engine compartment quickly.
stay in the vehicle and call for help.
5. How far should you scan ahead when driving?
A quarter of a mile at highway speeds
One block at lower speeds
12-15 seconds
All of the above.
6. Do NOT use water on a _______ fire.
7. Retarders:
improve traction.
can be noisy and may not be permitted everywhere.
help to increase brake pressure.
increase fuel efficiency.
8. At highway speeds, good drivers look at least _______ ahead.
150 feet
1/4 mile
1 mile
1/2 feet
9. A cardboard box on the road:
should always be driven over to avoid sudden direction changes.
is likely to be empty and should not be considered a hazard.
may contain some solid material capable of causing damage.
will never damage vehicle parts if driven over.
10. To check the automatic transmission fluid:
you should turn the engine off.
the wheel nuts must be loose.
you must go down grades.
the engine may have to be running.
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MD CDL Knowledge Test

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