Commercial Driver's License Flashcards
7 cards from real PENNDOT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Commercial Driver's License flashcards as text
A CMV driver must complete a written post-trip inspection report when:
Answer: Any defect or deficiency is found that could affect safety
Drivers must submit a written inspection report when they discover any defect that could affect the safe operation of the vehicle.
In Pennsylvania, what is the weight limit on the steer axle of a standard 5-axle tractor-trailer?
Answer: 20,000 lbs
Pennsylvania allows a maximum of 20,000 lbs on the steer axle of a tractor-trailer under standard weight regulations.
When driving a combination vehicle, what is 'trailer sway' most commonly caused by?
Answer: Excessive speed, especially on curves or ramps
Trailer sway (fishtailing) most commonly occurs when a driver takes curves, ramps, or makes sudden steering inputs at excessive speeds.
Which of the following is required for a Pennsylvania School Bus (S) endorsement applicant?
Answer: A background check and a valid Class B or A CDL
Applicants for the School Bus endorsement must hold a Class A or B CDL and pass a background check in addition to the endorsement knowledge and skills tests.
Under Pennsylvania regulations, what does a 'K' restriction on a CDL indicate?
Answer: The driver is restricted to intrastate commerce only
A 'K' restriction limits the CDL holder to intrastate (within Pennsylvania) commerce only, prohibiting interstate operation.
When coupling a tractor to a semi-trailer, a driver should check that the fifth wheel jaws are locked by:
Answer: Attempting to pull forward with the trailer brakes locked and visually inspecting the locking jaws
The correct coupling check is to pull against locked trailer brakes and visually confirm the fifth wheel jaws are fully closed around the kingpin.
What action should a CDL driver take when a tire blows out on the rear axle of a tractor-trailer?
Answer: Hold the steering wheel firmly and gradually reduce speed without braking hard
In a rear blowout, the driver should maintain a firm grip on the steering wheel and gradually slow down without sudden braking, which can cause loss of control.