PennDOT Commercial Driver's License 4

Question 1

A CMV driver must complete a written post-trip inspection report when:

Accepted Answer

Any defect or deficiency is found that could affect safety

Answer

The vehicle was driven more than 500 miles

Answer

The vehicle is carrying hazardous materials

Answer

The trip crosses state lines

Question 2

In Pennsylvania, what is the weight limit on the steer axle of a standard 5-axle tractor-trailer?

Accepted Answer

20,000 lbs

Answer

12,000 lbs

Answer

18,000 lbs

Answer

22,400 lbs

Question 3

When driving a combination vehicle, what is 'trailer sway' most commonly caused by?

Accepted Answer

Excessive speed, especially on curves or ramps

Answer

Underinflated front tires on the tractor

Answer

Overloading the tractor's fifth wheel

Answer

Running with the air conditioner at full power

Question 4

Which of the following is required for a Pennsylvania School Bus (S) endorsement applicant?

Accepted Answer

A background check and a valid Class B or A CDL

Answer

A valid passenger (P) endorsement only

Answer

A minimum of 2 years of CMV driving experience

Answer

A valid air brakes restriction removal only

Question 5

Under Pennsylvania regulations, what does a 'K' restriction on a CDL indicate?

Accepted Answer

The driver is restricted to intrastate commerce only

Answer

The driver may not operate vehicles with air brakes

Answer

The driver may not transport hazardous materials

Answer

The driver must wear corrective lenses while driving

Question 6

When coupling a tractor to a semi-trailer, a driver should check that the fifth wheel jaws are locked by:

Accepted Answer

Attempting to pull forward with the trailer brakes locked and visually inspecting the locking jaws

Answer

Pulling forward sharply to test the connection

Answer

Checking the air pressure in the trailer's air lines

Answer

Confirming the kingpin height matches the fifth wheel plate

Question 7

What action should a CDL driver take when a tire blows out on the rear axle of a tractor-trailer?

Accepted Answer

Hold the steering wheel firmly and gradually reduce speed without braking hard

Answer

Immediately slam on the brakes to regain control

Answer

Accelerate briefly to stabilize the vehicle before braking

Answer

Pull the trailer brake hand valve to slow the trailer only