How do you supply air to the trailer with the trailer air supply knob?
Right! Push it in to supply air; pull it out to shut it off and set the trailer emergency brakes. 📖 p. 6-5
From Section 6 of the Alaska Commercial Driver License Manual
Alaska CDL Combination Vehicles Practice Test
Who takes it: Class A.
Tractor-trailers and trucks pulling a heavy trailer. 20 questions, 16 right to pass (80%).
Practice Combination Vehicles
- 10questions a round
- 1manual section
Take the Combination Vehicles test
- 20questions
- 16correct to pass
- –no test taken yet
A Combination Vehicles question to try
Tap an answer to see if you’re right, and the page
Where it is in the Alaska Commercial Driver License Manual
Your score on each part fills in as you study.
- Manual section 6
- Combination vehiclesNot practiced yetp. 6-1 to 6-14
Alaska answers about this test
Practice material, not the official test: check every answer in your state's current handbook. Disclaimer · How the rounds work · DMV
All Alaska CDL tests
- General Knowledge
- Combination VehiclesYou're here
- Air Brakes
- Doubles and Triples
- Passenger
- School Bus
- Tank Vehicles
- Hazardous Materials
- Which tests do you need?Pick what you'll drive and get your Alaska CDL plan, in order.