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The CDL general knowledge test is required to be taken by all CDL applicants. The Massachusetts 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 Massachusetts 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 MA 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. Name two causes of tire fires.
Driver smoking and poor ventilation.
Excessive braking
Mismatched tires and road debris.
Under-inflated tires and dual tires that touch
2. Skids caused by acceleration can usually be stopped by:
swerving to the left.
applying the brakes firmly.
swerving to the right.
taking your foot off the accelerator.
3. When stopping at the scene of an accident, you should NOT:
report any qualified person who is at the accident and helping the injured.
notify authorities.
put on your 4-way emergency flashers.
set out reflective triangles.
4. Your driver license doesn't have the hazardous materials endorsement. You can drive a vehicle that carries hazardous materials if:
one of your passengers has the hazardous materials endorsement.
the vehicle does not require placards.
you are transporting hazardous materials for less than 50 miles.
All of the above.
5. If you let air out of hot tires:
air pressure will increases, causing the tires to blow out.
as the tire cools, the air pressure will be too low.
the tires will cool off much sooner.
None of the above.
6. The heavier the vehicle:
the more work the brakes must do to stop it.
the higher the center of gravity will be.
the less work the brakes must do to stop it.
None of the above.
7. If the safety relief valve in the air brake system releases air:
the valve is fully operational.
this will supply more power to the brakes.
something is wrong.
this will supply more power to the drive wheels.
8. What are the two basic reasons for covering cargo?
To protect the cargo from weather and to avoid littering.
To protect the cargo from pilferage and from weather.
To protect people from spilled cargo and the cargo from weather.
To protect people from spilled cargo and the cargo from pilferage.
9. Which of the following statements about stopping distance is true?
Reaction distance is the distance you will continue to travel, in ideal conditions, before you hit the brakes.
Braking distance is the distance your vehicle will travel, in ideal conditions, while you are braking.
Perception distance is the distance your vehicle travels, in ideal conditions, from the time your eyes see a hazard until your brain recognizes it.
All of the above.
10. Which of the following is NOT correct? An ABS system:
is a safety anti-skid braking system.
reduces the braking pressure to a safe level.
helps you avoid wheel lock up.
helps you stop faster.
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MA CDL Knowledge Test

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