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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. Most heavy duty vehicles use ___ air brake systems for safety.
2. Hydroplaning:
only happens when tire pressure is higher than normal.
never occurs at speeds below 40 mph.
only occurs at extremely high speeds.
can occur at speeds as low as 30 mph.
3. Most heavy vehicles require ________ change gears.
double shifting
single clutching
triple shifting
double clutching
4. The earliest way to recognize that your trailer has started to skid is:
by releasing the brakes.
by hearing squeaking noises from the wheels.
by checking your mirrors.
by checking the jackknife sensor.
5. If an aggressive driver is involved in an accident down the road, you should:
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
make eye contact with the driver.
try to get their vehicle to the side of the road.
confront the aggressive driver.
6. When you need to brake, you should warn the drivers behind:
by making gestures.
by flashing your brake lights.
by changing lanes.
by turning on the 4-way emergency flashers.
7. Headlights:
should be out of adjustment.
should not be used when driving at night.
must be turned on a half hour before sunset to a half hour after sunrise.
can blind other drivers.
8. If you are driving in fog, you should not:
slow down.
turn on the 4-way emergency flashers.
use high beams.
All of the above.
9. Using a helper when backing up is:
not recommended.
10. When driving on slippery surfaces, a lack of spray from other vehicles indicates that:
the pavement is dry.
ice has formed on the road.
the road hasn't started to ice up yet.
there is no ice on the road surface.
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PA CDL Knowledge Test

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