CDL Full Practice Test Part 19

1. What are the “no-zone” blind spot areas around a commercial motor vehicle that other drivers should avoid?

2. Under 49 CFR 391.41(b)(11), what is the hearing standard for CDL qualification?

3. What is the maximum acceptable air pressure drop during a static leak test for a combination vehicle (tractor and trailer) with the engine off?

4. A driver operates a fully loaded Class A tractor-semitrailer on a 6% downgrade lasting 4 miles. The driver maintains speed by applying service brakes frequently and riding the brakes for most of the descent. Near the bottom of the grade, the brakes begin to fade, feel soft, and provide reduced stopping power. The driver then applies maximum brake pressure, which causes complete brake failure. What two critical errors caused this outcome?

5. A driver with Tank Vehicle (N) endorsement is comparing two tank trailers for a liquid chemical transport assignment. Trailer A is a baffled tanker with internal bulkhead plates dividing the tank into compartments with holes allowing liquid flow. Trailer B is a smooth bore tanker with no internal structures. Both tanks have identical external dimensions and capacity. The route includes 150 miles of winding mountain roads. Analyze the surge characteristics and handling differences between these two tank configurations for this specific route.

6. During coupling, a driver backs under the trailer but the fifth wheel does not lock onto the kingpin — the trailer moves forward during the tug test. Which of the following is the MOST likely cause of this coupling failure?

7. Which statement accurately describes the correct procedure for shifting gears on a commercial motor vehicle with a manual transmission?

8. A driver weighs his tractor-semitrailer combination and finds the following: steer axle 12,000 lbs, drive axle 18,000 lbs, trailer tandem axle 32,000 lbs. The total weight is 62,000 lbs. Which axle configuration exceeds federal limits and requires the driver to adjust weight distribution?

9. During the trailer coupling inspection portion of a pre-trip inspection, which step should be performed FIRST to verify proper fifth wheel connection?

10. You are driving a tractor-semitrailer on a highway when the vehicle begins to skid on a slick surface. The rear of the tractor is sliding toward the right side (trailer is pushing the tractor into a potential jackknife). You have the engine brake (jake brake) engaged from earlier driving. What is the correct sequence of actions to recover from this skid safely?