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The CDL general knowledge test is required to be taken by all CDL applicants. The Pennsylvania 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 Pennsylvania 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 PA 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. To check the signal lights, do the following:
Turn on the stop lights, turn on all the lights, and turn on the right turn signal lights.
Turn off all the lights, turn on the stop lights, and turn on the left turn signal lights.
Turn off all the lights, turn on the right turn signal lights, and turn on the stop lights.
Turn on all the lights, turn off the stop lights, and turn off the left turn signal lights.
2. Retarders:
help slow a vehicle, reducing the need for using brakes.
reduce braking distance.
reduce the danger of slipping.
improve gas mileage.
3. To prevent drowsiness before a trip, you should:
drive with a passenger.
consult your physician if you suffer from daytime sleepiness.
schedule trips for the hours you are normally awake.
All of the above.
4. When should you turn the retarder off?
when the cargo is heavy.
when the cargo is prone to shifting.
when the road is slippery.
when your vehicle has a high center of gravity.
5. When driving in heavy rain:
take curves at higher speeds and brake while in curves.
avoid driving through deep puddles or flowing water if possible.
drive alongside other vehicles if possible.
All of the above.
6. To avoid becoming distracted while driving, you should:
adjust all vehicle controls and mirrors prior to driving.
plan your route before you begin driving.
clear the vehicle of any unnecessary objects.
All of the above.
7. The weight of a truck:
has an impact on stopping distance.
has no effect on stopping distance.
is not as important as the vehicle's center of gravity in determining stopping distance.
None of the above.
8. ABS helps you:
stop faster.
brake harder.
drive faster.
None of the above.
9. If you do not have a cell phone or CB, the first thing you should do at an accident scene is to:
gather Information for the  accident report.
care for the injured.
protect the accident area.
clear the area.
10. One way to prevent hydroplaning is to:
take curves at higher speeds.
make sure you have enough tread on your tires.
use the controlled braking method.
have less than 4/32 inch tread depth in every major groove on front tires.
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PA CDL Knowledge Test

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