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Wisconsin CDL Practice Test: Class A - Test 6 2019

(From the 2019 Wisconsin CDL Handbook)
Number of tests: 6
Number of questions: 30
Passing score: 80

Directions: When applying for this license, applicants must pass a 50-question test. And applicants must score 80% to pass the test. The following questions are based on the details provided in the Wisconsin Commercial Driver Handbook. Endorsements that may be used with a Class A CDL include Hazardous Materials, Passenger, Double and Triples, HazMat and Tanker, Air Brakes and School bus. If you need additional information, please contact your local DMV office. You can find your nearest DMV office at Wisconsin DMV locations.

You have made 2 errors so far.
1. If the air compressor does not have its own oil supply, how is it lubricated?
  • Sound your horn.

  • Turn on your four-way flasher.

  • Look for traffic by turning your head.

  • Look for traffic by using your inside rear-view mirror.

2. What is the purpose of dummy coupler?
  • Take your hands off the wheel

  • All of the above

  • Take your eyes off the road

  • Take your attention away from the driving task

3. Within the first ____ miles of your journey you should always check that your cargo is secure.
  • School buses and passenger buses carrying passengers.

  • Vehicles towing a trailer.

  • Motorcycles.

  • Pick up trucks.

4. In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
  • Only a blood alcohol level greater than .05

  • Only a blood alcohol level greater than the legal limit

  • Even the smallest amount of alcohol

  • Alcohol does not

5. The parking brake valve should close when the air pressure falls into what range?
  • Condition and type of vehicle tires

  • Condition of your vehicle's brakes

  • Your own reaction time

  • The time of day

6. The space under a heavily loaded vehicle is very small. Because of this you might want to avoid what surfaces?
  • Warning of a winding road ahead.

  • Warning of a right turn ahead.

  • Warning of a right curve ahead.

  • Warning of merging traffic to the right.